1 13b2bc37 2022-10-23 stsp /*
   2 13b2bc37 2022-10-23 stsp  * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>
   3 13b2bc37 2022-10-23 stsp  *
   4 13b2bc37 2022-10-23 stsp  * Permission to use, copy, modify, and distribute this software for any
   5 13b2bc37 2022-10-23 stsp  * purpose with or without fee is hereby granted, provided that the above
   6 13b2bc37 2022-10-23 stsp  * copyright notice and this permission notice appear in all copies.
   7 13b2bc37 2022-10-23 stsp  *
   8 13b2bc37 2022-10-23 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9 13b2bc37 2022-10-23 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10 13b2bc37 2022-10-23 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11 13b2bc37 2022-10-23 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12 13b2bc37 2022-10-23 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13 13b2bc37 2022-10-23 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14 13b2bc37 2022-10-23 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15 13b2bc37 2022-10-23 stsp  */
  16 13b2bc37 2022-10-23 stsp 
  17 13b2bc37 2022-10-23 stsp #include <sys/queue.h>
  18 13b2bc37 2022-10-23 stsp #include <sys/tree.h>
  19 13b2bc37 2022-10-23 stsp #include <sys/time.h>
  20 13b2bc37 2022-10-23 stsp #include <sys/types.h>
  21 13b2bc37 2022-10-23 stsp #include <sys/stat.h>
  22 13b2bc37 2022-10-23 stsp #include <sys/socket.h>
  23 13b2bc37 2022-10-23 stsp #include <sys/un.h>
  24 13b2bc37 2022-10-23 stsp #include <sys/wait.h>
  25 abe89edb 2023-11-16 stsp #include <sys/resource.h>
  26 13b2bc37 2022-10-23 stsp 
  27 13b2bc37 2022-10-23 stsp #include <fcntl.h>
  28 13b2bc37 2022-10-23 stsp #include <err.h>
  29 13b2bc37 2022-10-23 stsp #include <errno.h>
  30 13b2bc37 2022-10-23 stsp #include <event.h>
  31 13b2bc37 2022-10-23 stsp #include <limits.h>
  32 13b2bc37 2022-10-23 stsp #include <pwd.h>
  33 13b2bc37 2022-10-23 stsp #include <imsg.h>
  34 13b2bc37 2022-10-23 stsp #include <sha1.h>
  35 5822e79e 2023-02-23 op #include <sha2.h>
  36 13b2bc37 2022-10-23 stsp #include <signal.h>
  37 13b2bc37 2022-10-23 stsp #include <siphash.h>
  38 13b2bc37 2022-10-23 stsp #include <stdarg.h>
  39 13b2bc37 2022-10-23 stsp #include <stdio.h>
  40 13b2bc37 2022-10-23 stsp #include <stdlib.h>
  41 13b2bc37 2022-10-23 stsp #include <string.h>
  42 13b2bc37 2022-10-23 stsp #include <syslog.h>
  43 13b2bc37 2022-10-23 stsp #include <unistd.h>
  44 13b2bc37 2022-10-23 stsp 
  45 13b2bc37 2022-10-23 stsp #include "got_error.h"
  46 13b2bc37 2022-10-23 stsp #include "got_opentemp.h"
  47 13b2bc37 2022-10-23 stsp #include "got_path.h"
  48 13b2bc37 2022-10-23 stsp #include "got_repository.h"
  49 13b2bc37 2022-10-23 stsp #include "got_object.h"
  50 13b2bc37 2022-10-23 stsp #include "got_reference.h"
  51 13b2bc37 2022-10-23 stsp 
  52 13b2bc37 2022-10-23 stsp #include "got_lib_delta.h"
  53 13b2bc37 2022-10-23 stsp #include "got_lib_object.h"
  54 13b2bc37 2022-10-23 stsp #include "got_lib_object_cache.h"
  55 53bf0b54 2023-02-23 op #include "got_lib_hash.h"
  56 13b2bc37 2022-10-23 stsp #include "got_lib_gitproto.h"
  57 13b2bc37 2022-10-23 stsp #include "got_lib_pack.h"
  58 13b2bc37 2022-10-23 stsp #include "got_lib_repository.h"
  59 13b2bc37 2022-10-23 stsp 
  60 13b2bc37 2022-10-23 stsp #include "gotd.h"
  61 13b2bc37 2022-10-23 stsp #include "log.h"
  62 d93ecf7d 2022-12-14 stsp #include "listen.h"
  63 0ccf3acb 2022-11-16 stsp #include "auth.h"
  64 ae7c1b78 2023-01-10 stsp #include "session.h"
  65 13b2bc37 2022-10-23 stsp #include "repo_read.h"
  66 13b2bc37 2022-10-23 stsp #include "repo_write.h"
  67 13b2bc37 2022-10-23 stsp 
  68 13b2bc37 2022-10-23 stsp #ifndef nitems
  69 13b2bc37 2022-10-23 stsp #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
  70 13b2bc37 2022-10-23 stsp #endif
  71 13b2bc37 2022-10-23 stsp 
  72 eac23c30 2023-01-10 stsp enum gotd_client_state {
  73 eac23c30 2023-01-10 stsp 	GOTD_CLIENT_STATE_NEW,
  74 eac23c30 2023-01-10 stsp 	GOTD_CLIENT_STATE_ACCESS_GRANTED,
  75 c929736a 2023-06-22 op };
  76 c929736a 2023-06-22 op 
  77 c929736a 2023-06-22 op struct gotd_child_proc {
  78 c929736a 2023-06-22 op 	pid_t				 pid;
  79 c929736a 2023-06-22 op 	enum gotd_procid		 type;
  80 c929736a 2023-06-22 op 	char				 repo_name[NAME_MAX];
  81 c929736a 2023-06-22 op 	char				 repo_path[PATH_MAX];
  82 c929736a 2023-06-22 op 	int				 pipe[2];
  83 c929736a 2023-06-22 op 	struct gotd_imsgev		 iev;
  84 839338f6 2023-06-22 op 	struct event			 tmo;
  85 839338f6 2023-06-22 op 
  86 839338f6 2023-06-22 op 	TAILQ_ENTRY(gotd_child_proc)	 entry;
  87 eac23c30 2023-01-10 stsp };
  88 839338f6 2023-06-22 op TAILQ_HEAD(gotd_procs, gotd_child_proc) procs;
  89 eac23c30 2023-01-10 stsp 
  90 13b2bc37 2022-10-23 stsp struct gotd_client {
  91 13b2bc37 2022-10-23 stsp 	STAILQ_ENTRY(gotd_client)	 entry;
  92 13b2bc37 2022-10-23 stsp 	enum gotd_client_state		 state;
  93 13b2bc37 2022-10-23 stsp 	uint32_t			 id;
  94 13b2bc37 2022-10-23 stsp 	int				 fd;
  95 13b2bc37 2022-10-23 stsp 	struct gotd_imsgev		 iev;
  96 13b2bc37 2022-10-23 stsp 	struct event			 tmo;
  97 13b2bc37 2022-10-23 stsp 	uid_t				 euid;
  98 13b2bc37 2022-10-23 stsp 	gid_t				 egid;
  99 56624d2b 2023-12-27 stsp 	char				*username;
 100 f7a854cf 2023-01-10 stsp 	struct gotd_child_proc		*repo;
 101 5e25db14 2022-12-29 stsp 	struct gotd_child_proc		*auth;
 102 ae7c1b78 2023-01-10 stsp 	struct gotd_child_proc		*session;
 103 5e25db14 2022-12-29 stsp 	int				 required_auth;
 104 13b2bc37 2022-10-23 stsp };
 105 13b2bc37 2022-10-23 stsp STAILQ_HEAD(gotd_clients, gotd_client);
 106 13b2bc37 2022-10-23 stsp 
 107 13b2bc37 2022-10-23 stsp static struct gotd_clients gotd_clients[GOTD_CLIENT_TABLE_SIZE];
 108 13b2bc37 2022-10-23 stsp static SIPHASH_KEY clients_hash_key;
 109 13b2bc37 2022-10-23 stsp volatile int client_cnt;
 110 ef4e2f01 2022-12-29 stsp static struct timeval auth_timeout = { 5, 0 };
 111 13b2bc37 2022-10-23 stsp static struct gotd gotd;
 112 13b2bc37 2022-10-23 stsp 
 113 13b2bc37 2022-10-23 stsp void gotd_sighdlr(int sig, short event, void *arg);
 114 f1752522 2022-10-29 stsp static void gotd_shutdown(void);
 115 ae7c1b78 2023-01-10 stsp static const struct got_error *start_session_child(struct gotd_client *,
 116 ae7c1b78 2023-01-10 stsp     struct gotd_repo *, char *, const char *, int, int);
 117 b50a2b46 2022-12-29 stsp static const struct got_error *start_repo_child(struct gotd_client *,
 118 b50a2b46 2022-12-29 stsp     enum gotd_procid, struct gotd_repo *, char *, const char *, int, int);
 119 5e25db14 2022-12-29 stsp static const struct got_error *start_auth_child(struct gotd_client *, int,
 120 5e25db14 2022-12-29 stsp     struct gotd_repo *, char *, const char *, int, int);
 121 b50a2b46 2022-12-29 stsp static void kill_proc(struct gotd_child_proc *, int);
 122 839338f6 2023-06-22 op static void disconnect(struct gotd_client *);
 123 13b2bc37 2022-10-23 stsp 
 124 13b2bc37 2022-10-23 stsp __dead static void
 125 575dc3f9 2023-02-09 op usage(void)
 126 13b2bc37 2022-10-23 stsp {
 127 e9e01966 2023-01-18 stsp 	fprintf(stderr, "usage: %s [-dnv] [-f config-file]\n", getprogname());
 128 88dec179 2022-10-24 stsp 	exit(1);
 129 13b2bc37 2022-10-23 stsp }
 130 13b2bc37 2022-10-23 stsp 
 131 13b2bc37 2022-10-23 stsp static int
 132 13b2bc37 2022-10-23 stsp unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
 133 13b2bc37 2022-10-23 stsp {
 134 13b2bc37 2022-10-23 stsp 	struct sockaddr_un sun;
 135 13b2bc37 2022-10-23 stsp 	int fd = -1;
 136 13b2bc37 2022-10-23 stsp 	mode_t old_umask, mode;
 137 13b2bc37 2022-10-23 stsp 
 138 13b2bc37 2022-10-23 stsp 	fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
 139 13b2bc37 2022-10-23 stsp 	if (fd == -1) {
 140 13b2bc37 2022-10-23 stsp 		log_warn("socket");
 141 13b2bc37 2022-10-23 stsp 		return -1;
 142 13b2bc37 2022-10-23 stsp 	}
 143 13b2bc37 2022-10-23 stsp 
 144 13b2bc37 2022-10-23 stsp 	sun.sun_family = AF_UNIX;
 145 13b2bc37 2022-10-23 stsp 	if (strlcpy(sun.sun_path, unix_socket_path,
 146 13b2bc37 2022-10-23 stsp 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
 147 13b2bc37 2022-10-23 stsp 		log_warnx("%s: name too long", unix_socket_path);
 148 13b2bc37 2022-10-23 stsp 		close(fd);
 149 13b2bc37 2022-10-23 stsp 		return -1;
 150 13b2bc37 2022-10-23 stsp 	}
 151 13b2bc37 2022-10-23 stsp 
 152 13b2bc37 2022-10-23 stsp 	if (unlink(unix_socket_path) == -1) {
 153 13b2bc37 2022-10-23 stsp 		if (errno != ENOENT) {
 154 13b2bc37 2022-10-23 stsp 			log_warn("unlink %s", unix_socket_path);
 155 13b2bc37 2022-10-23 stsp 			close(fd);
 156 13b2bc37 2022-10-23 stsp 			return -1;
 157 13b2bc37 2022-10-23 stsp 		}
 158 13b2bc37 2022-10-23 stsp 	}
 159 13b2bc37 2022-10-23 stsp 
 160 13b2bc37 2022-10-23 stsp 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
 161 6f854dde 2023-01-04 stsp 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
 162 13b2bc37 2022-10-23 stsp 
 163 13b2bc37 2022-10-23 stsp 	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
 164 13b2bc37 2022-10-23 stsp 		log_warn("bind: %s", unix_socket_path);
 165 13b2bc37 2022-10-23 stsp 		close(fd);
 166 13b2bc37 2022-10-23 stsp 		umask(old_umask);
 167 13b2bc37 2022-10-23 stsp 		return -1;
 168 13b2bc37 2022-10-23 stsp 	}
 169 13b2bc37 2022-10-23 stsp 
 170 13b2bc37 2022-10-23 stsp 	umask(old_umask);
 171 13b2bc37 2022-10-23 stsp 
 172 13b2bc37 2022-10-23 stsp 	if (chmod(unix_socket_path, mode) == -1) {
 173 13b2bc37 2022-10-23 stsp 		log_warn("chmod %o %s", mode, unix_socket_path);
 174 13b2bc37 2022-10-23 stsp 		close(fd);
 175 13b2bc37 2022-10-23 stsp 		unlink(unix_socket_path);
 176 13b2bc37 2022-10-23 stsp 		return -1;
 177 13b2bc37 2022-10-23 stsp 	}
 178 13b2bc37 2022-10-23 stsp 
 179 13b2bc37 2022-10-23 stsp 	if (chown(unix_socket_path, uid, gid) == -1) {
 180 13b2bc37 2022-10-23 stsp 		log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
 181 13b2bc37 2022-10-23 stsp 		close(fd);
 182 13b2bc37 2022-10-23 stsp 		unlink(unix_socket_path);
 183 13b2bc37 2022-10-23 stsp 		return -1;
 184 13b2bc37 2022-10-23 stsp 	}
 185 13b2bc37 2022-10-23 stsp 
 186 13b2bc37 2022-10-23 stsp 	if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
 187 13b2bc37 2022-10-23 stsp 		log_warn("listen");
 188 13b2bc37 2022-10-23 stsp 		close(fd);
 189 13b2bc37 2022-10-23 stsp 		unlink(unix_socket_path);
 190 13b2bc37 2022-10-23 stsp 		return -1;
 191 13b2bc37 2022-10-23 stsp 	}
 192 13b2bc37 2022-10-23 stsp 
 193 13b2bc37 2022-10-23 stsp 	return fd;
 194 13b2bc37 2022-10-23 stsp }
 195 13b2bc37 2022-10-23 stsp 
 196 13b2bc37 2022-10-23 stsp static uint64_t
 197 13b2bc37 2022-10-23 stsp client_hash(uint32_t client_id)
 198 13b2bc37 2022-10-23 stsp {
 199 13b2bc37 2022-10-23 stsp 	return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
 200 13b2bc37 2022-10-23 stsp }
 201 13b2bc37 2022-10-23 stsp 
 202 13b2bc37 2022-10-23 stsp static void
 203 13b2bc37 2022-10-23 stsp add_client(struct gotd_client *client)
 204 13b2bc37 2022-10-23 stsp {
 205 13b2bc37 2022-10-23 stsp 	uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
 206 13b2bc37 2022-10-23 stsp 	STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
 207 13b2bc37 2022-10-23 stsp 	client_cnt++;
 208 13b2bc37 2022-10-23 stsp }
 209 13b2bc37 2022-10-23 stsp 
 210 13b2bc37 2022-10-23 stsp static struct gotd_client *
 211 13b2bc37 2022-10-23 stsp find_client(uint32_t client_id)
 212 13b2bc37 2022-10-23 stsp {
 213 13b2bc37 2022-10-23 stsp 	uint64_t slot;
 214 13b2bc37 2022-10-23 stsp 	struct gotd_client *c;
 215 13b2bc37 2022-10-23 stsp 
 216 13b2bc37 2022-10-23 stsp 	slot = client_hash(client_id) % nitems(gotd_clients);
 217 13b2bc37 2022-10-23 stsp 	STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
 218 13b2bc37 2022-10-23 stsp 		if (c->id == client_id)
 219 13b2bc37 2022-10-23 stsp 			return c;
 220 13b2bc37 2022-10-23 stsp 	}
 221 13b2bc37 2022-10-23 stsp 
 222 13b2bc37 2022-10-23 stsp 	return NULL;
 223 13b2bc37 2022-10-23 stsp }
 224 13b2bc37 2022-10-23 stsp 
 225 b50a2b46 2022-12-29 stsp static struct gotd_client *
 226 b50a2b46 2022-12-29 stsp find_client_by_proc_fd(int fd)
 227 b50a2b46 2022-12-29 stsp {
 228 b50a2b46 2022-12-29 stsp 	uint64_t slot;
 229 b50a2b46 2022-12-29 stsp 
 230 b50a2b46 2022-12-29 stsp 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
 231 b50a2b46 2022-12-29 stsp 		struct gotd_client *c;
 232 b50a2b46 2022-12-29 stsp 
 233 b50a2b46 2022-12-29 stsp 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
 234 f7a854cf 2023-01-10 stsp 			if (c->repo && c->repo->iev.ibuf.fd == fd)
 235 b50a2b46 2022-12-29 stsp 				return c;
 236 5e25db14 2022-12-29 stsp 			if (c->auth && c->auth->iev.ibuf.fd == fd)
 237 ae7c1b78 2023-01-10 stsp 				return c;
 238 ae7c1b78 2023-01-10 stsp 			if (c->session && c->session->iev.ibuf.fd == fd)
 239 5e25db14 2022-12-29 stsp 				return c;
 240 b50a2b46 2022-12-29 stsp 		}
 241 b50a2b46 2022-12-29 stsp 	}
 242 f1752522 2022-10-29 stsp 
 243 13b2bc37 2022-10-23 stsp 	return NULL;
 244 13b2bc37 2022-10-23 stsp }
 245 13b2bc37 2022-10-23 stsp 
 246 13b2bc37 2022-10-23 stsp static int
 247 13b2bc37 2022-10-23 stsp client_is_reading(struct gotd_client *client)
 248 13b2bc37 2022-10-23 stsp {
 249 f7a854cf 2023-01-10 stsp 	return (client->required_auth &
 250 f7a854cf 2023-01-10 stsp 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) == GOTD_AUTH_READ;
 251 13b2bc37 2022-10-23 stsp }
 252 13b2bc37 2022-10-23 stsp 
 253 13b2bc37 2022-10-23 stsp static int
 254 13b2bc37 2022-10-23 stsp client_is_writing(struct gotd_client *client)
 255 13b2bc37 2022-10-23 stsp {
 256 f7a854cf 2023-01-10 stsp 	return (client->required_auth &
 257 f7a854cf 2023-01-10 stsp 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) ==
 258 f7a854cf 2023-01-10 stsp 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE);
 259 13b2bc37 2022-10-23 stsp }
 260 13b2bc37 2022-10-23 stsp 
 261 13b2bc37 2022-10-23 stsp static const struct got_error *
 262 13b2bc37 2022-10-23 stsp ensure_client_is_not_writing(struct gotd_client *client)
 263 13b2bc37 2022-10-23 stsp {
 264 13b2bc37 2022-10-23 stsp 	if (client_is_writing(client)) {
 265 13b2bc37 2022-10-23 stsp 		return got_error_fmt(GOT_ERR_BAD_PACKET,
 266 13b2bc37 2022-10-23 stsp 		    "uid %d made a read-request but is writing to "
 267 13b2bc37 2022-10-23 stsp 		    "a repository", client->euid);
 268 13b2bc37 2022-10-23 stsp 	}
 269 13b2bc37 2022-10-23 stsp 
 270 13b2bc37 2022-10-23 stsp 	return NULL;
 271 13b2bc37 2022-10-23 stsp }
 272 13b2bc37 2022-10-23 stsp 
 273 13b2bc37 2022-10-23 stsp static const struct got_error *
 274 13b2bc37 2022-10-23 stsp ensure_client_is_not_reading(struct gotd_client *client)
 275 13b2bc37 2022-10-23 stsp {
 276 13b2bc37 2022-10-23 stsp 	if (client_is_reading(client)) {
 277 13b2bc37 2022-10-23 stsp 		return got_error_fmt(GOT_ERR_BAD_PACKET,
 278 13b2bc37 2022-10-23 stsp 		    "uid %d made a write-request but is reading from "
 279 13b2bc37 2022-10-23 stsp 		    "a repository", client->euid);
 280 13b2bc37 2022-10-23 stsp 	}
 281 13b2bc37 2022-10-23 stsp 
 282 13b2bc37 2022-10-23 stsp 	return NULL;
 283 b50a2b46 2022-12-29 stsp }
 284 b50a2b46 2022-12-29 stsp 
 285 b50a2b46 2022-12-29 stsp static void
 286 839338f6 2023-06-22 op proc_done(struct gotd_child_proc *proc)
 287 b50a2b46 2022-12-29 stsp {
 288 839338f6 2023-06-22 op 	struct gotd_client *client;
 289 b50a2b46 2022-12-29 stsp 
 290 839338f6 2023-06-22 op 	TAILQ_REMOVE(&procs, proc, entry);
 291 b50a2b46 2022-12-29 stsp 
 292 839338f6 2023-06-22 op 	client = find_client_by_proc_fd(proc->iev.ibuf.fd);
 293 839338f6 2023-06-22 op 	if (client != NULL) {
 294 839338f6 2023-06-22 op 		if (proc == client->repo)
 295 839338f6 2023-06-22 op 			client->repo = NULL;
 296 839338f6 2023-06-22 op 		if (proc == client->auth)
 297 839338f6 2023-06-22 op 			client->auth = NULL;
 298 839338f6 2023-06-22 op 		if (proc == client->session)
 299 839338f6 2023-06-22 op 			client->session = NULL;
 300 839338f6 2023-06-22 op 		disconnect(client);
 301 839338f6 2023-06-22 op 	}
 302 ae7c1b78 2023-01-10 stsp 
 303 839338f6 2023-06-22 op 	evtimer_del(&proc->tmo);
 304 839338f6 2023-06-22 op 
 305 839338f6 2023-06-22 op 	if (proc->iev.ibuf.fd != -1) {
 306 839338f6 2023-06-22 op 		event_del(&proc->iev.ev);
 307 839338f6 2023-06-22 op 		msgbuf_clear(&proc->iev.ibuf.w);
 308 839338f6 2023-06-22 op 		close(proc->iev.ibuf.fd);
 309 839338f6 2023-06-22 op 	}
 310 839338f6 2023-06-22 op 
 311 ae7c1b78 2023-01-10 stsp 	free(proc);
 312 ba91039c 2023-06-22 op }
 313 ba91039c 2023-06-22 op 
 314 ba91039c 2023-06-22 op static void
 315 ba91039c 2023-06-22 op kill_repo_proc(struct gotd_client *client)
 316 ba91039c 2023-06-22 op {
 317 ba91039c 2023-06-22 op 	if (client->repo == NULL)
 318 ba91039c 2023-06-22 op 		return;
 319 ba91039c 2023-06-22 op 
 320 839338f6 2023-06-22 op 	kill_proc(client->repo, 0);
 321 ba91039c 2023-06-22 op 	client->repo = NULL;
 322 13b2bc37 2022-10-23 stsp }
 323 13b2bc37 2022-10-23 stsp 
 324 13b2bc37 2022-10-23 stsp static void
 325 5e25db14 2022-12-29 stsp kill_auth_proc(struct gotd_client *client)
 326 5e25db14 2022-12-29 stsp {
 327 5e25db14 2022-12-29 stsp 	if (client->auth == NULL)
 328 5e25db14 2022-12-29 stsp 		return;
 329 5e25db14 2022-12-29 stsp 
 330 839338f6 2023-06-22 op 	kill_proc(client->auth, 0);
 331 5e25db14 2022-12-29 stsp 	client->auth = NULL;
 332 5e25db14 2022-12-29 stsp }
 333 5e25db14 2022-12-29 stsp 
 334 5e25db14 2022-12-29 stsp static void
 335 ae7c1b78 2023-01-10 stsp kill_session_proc(struct gotd_client *client)
 336 ae7c1b78 2023-01-10 stsp {
 337 ae7c1b78 2023-01-10 stsp 	if (client->session == NULL)
 338 ae7c1b78 2023-01-10 stsp 		return;
 339 ae7c1b78 2023-01-10 stsp 
 340 839338f6 2023-06-22 op 	kill_proc(client->session, 0);
 341 ae7c1b78 2023-01-10 stsp 	client->session = NULL;
 342 ae7c1b78 2023-01-10 stsp }
 343 ae7c1b78 2023-01-10 stsp 
 344 ae7c1b78 2023-01-10 stsp static void
 345 13b2bc37 2022-10-23 stsp disconnect(struct gotd_client *client)
 346 13b2bc37 2022-10-23 stsp {
 347 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_disconnect idisconnect;
 348 c929736a 2023-06-22 op 	struct gotd_child_proc *listen_proc = gotd.listen_proc;
 349 13b2bc37 2022-10-23 stsp 	uint64_t slot;
 350 13b2bc37 2022-10-23 stsp 
 351 13b2bc37 2022-10-23 stsp 	log_debug("uid %d: disconnecting", client->euid);
 352 5e25db14 2022-12-29 stsp 
 353 5e25db14 2022-12-29 stsp 	kill_auth_proc(client);
 354 ae7c1b78 2023-01-10 stsp 	kill_session_proc(client);
 355 ba91039c 2023-06-22 op 	kill_repo_proc(client);
 356 d93ecf7d 2022-12-14 stsp 
 357 90270f79 2023-02-09 stsp 	idisconnect.client_id = client->id;
 358 d93ecf7d 2022-12-14 stsp 	if (gotd_imsg_compose_event(&listen_proc->iev,
 359 d93ecf7d 2022-12-14 stsp 	    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
 360 d93ecf7d 2022-12-14 stsp 	    &idisconnect, sizeof(idisconnect)) == -1)
 361 d93ecf7d 2022-12-14 stsp 		log_warn("imsg compose DISCONNECT");
 362 d93ecf7d 2022-12-14 stsp 
 363 13b2bc37 2022-10-23 stsp 	slot = client_hash(client->id) % nitems(gotd_clients);
 364 13b2bc37 2022-10-23 stsp 	STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
 365 13b2bc37 2022-10-23 stsp 	imsg_clear(&client->iev.ibuf);
 366 13b2bc37 2022-10-23 stsp 	event_del(&client->iev.ev);
 367 13b2bc37 2022-10-23 stsp 	evtimer_del(&client->tmo);
 368 ae7c1b78 2023-01-10 stsp 	if (client->fd != -1)
 369 ae7c1b78 2023-01-10 stsp 		close(client->fd);
 370 ae7c1b78 2023-01-10 stsp 	else if (client->iev.ibuf.fd != -1)
 371 ae7c1b78 2023-01-10 stsp 		close(client->iev.ibuf.fd);
 372 56624d2b 2023-12-27 stsp 	free(client->username);
 373 13b2bc37 2022-10-23 stsp 	free(client);
 374 13b2bc37 2022-10-23 stsp 	client_cnt--;
 375 13b2bc37 2022-10-23 stsp }
 376 13b2bc37 2022-10-23 stsp 
 377 13b2bc37 2022-10-23 stsp static void
 378 13b2bc37 2022-10-23 stsp disconnect_on_error(struct gotd_client *client, const struct got_error *err)
 379 13b2bc37 2022-10-23 stsp {
 380 13b2bc37 2022-10-23 stsp 	struct imsgbuf ibuf;
 381 13b2bc37 2022-10-23 stsp 
 382 1050403b 2023-08-11 stsp 	if (err->code != GOT_ERR_EOF) {
 383 1050403b 2023-08-11 stsp 		log_warnx("uid %d: %s", client->euid, err->msg);
 384 1050403b 2023-08-11 stsp 		if (client->fd != -1) {
 385 1050403b 2023-08-11 stsp 			imsg_init(&ibuf, client->fd);
 386 1050403b 2023-08-11 stsp 			gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
 387 1050403b 2023-08-11 stsp 			imsg_clear(&ibuf);
 388 1050403b 2023-08-11 stsp 		}
 389 13b2bc37 2022-10-23 stsp 	}
 390 13b2bc37 2022-10-23 stsp 	disconnect(client);
 391 f1752522 2022-10-29 stsp }
 392 f1752522 2022-10-29 stsp 
 393 f1752522 2022-10-29 stsp static const struct got_error *
 394 f1752522 2022-10-29 stsp send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
 395 f1752522 2022-10-29 stsp {
 396 f1752522 2022-10-29 stsp 	const struct got_error *err = NULL;
 397 f1752522 2022-10-29 stsp 	struct gotd_imsg_info_repo irepo;
 398 f1752522 2022-10-29 stsp 
 399 f1752522 2022-10-29 stsp 	memset(&irepo, 0, sizeof(irepo));
 400 f1752522 2022-10-29 stsp 
 401 f1752522 2022-10-29 stsp 	if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
 402 f1752522 2022-10-29 stsp 	    >= sizeof(irepo.repo_name))
 403 f1752522 2022-10-29 stsp 		return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
 404 f1752522 2022-10-29 stsp 	if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
 405 f1752522 2022-10-29 stsp 	    >= sizeof(irepo.repo_path))
 406 f1752522 2022-10-29 stsp 		return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
 407 f1752522 2022-10-29 stsp 
 408 f1752522 2022-10-29 stsp 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
 409 f1752522 2022-10-29 stsp 	    &irepo, sizeof(irepo)) == -1) {
 410 f1752522 2022-10-29 stsp 		err = got_error_from_errno("imsg compose INFO_REPO");
 411 f1752522 2022-10-29 stsp 		if (err)
 412 f1752522 2022-10-29 stsp 			return err;
 413 f1752522 2022-10-29 stsp 	}
 414 f1752522 2022-10-29 stsp 
 415 f1752522 2022-10-29 stsp 	return NULL;
 416 f1752522 2022-10-29 stsp }
 417 f1752522 2022-10-29 stsp 
 418 f1752522 2022-10-29 stsp static const struct got_error *
 419 f1752522 2022-10-29 stsp send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
 420 f1752522 2022-10-29 stsp {
 421 f1752522 2022-10-29 stsp 	const struct got_error *err = NULL;
 422 f1752522 2022-10-29 stsp 	struct gotd_imsg_info_client iclient;
 423 f1752522 2022-10-29 stsp 	struct gotd_child_proc *proc;
 424 f1752522 2022-10-29 stsp 
 425 f1752522 2022-10-29 stsp 	memset(&iclient, 0, sizeof(iclient));
 426 f1752522 2022-10-29 stsp 	iclient.euid = client->euid;
 427 f1752522 2022-10-29 stsp 	iclient.egid = client->egid;
 428 f1752522 2022-10-29 stsp 
 429 f7a854cf 2023-01-10 stsp 	proc = client->repo;
 430 f1752522 2022-10-29 stsp 	if (proc) {
 431 eec68231 2022-12-14 stsp 		if (strlcpy(iclient.repo_name, proc->repo_path,
 432 f1752522 2022-10-29 stsp 		    sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
 433 f1752522 2022-10-29 stsp 			return got_error_msg(GOT_ERR_NO_SPACE,
 434 f1752522 2022-10-29 stsp 			    "repo name too long");
 435 f1752522 2022-10-29 stsp 		}
 436 f1752522 2022-10-29 stsp 		if (client_is_writing(client))
 437 f1752522 2022-10-29 stsp 			iclient.is_writing = 1;
 438 ae7c1b78 2023-01-10 stsp 
 439 ae7c1b78 2023-01-10 stsp 		iclient.repo_child_pid = proc->pid;
 440 f1752522 2022-10-29 stsp 	}
 441 f1752522 2022-10-29 stsp 
 442 ae7c1b78 2023-01-10 stsp 	if (client->session)
 443 ae7c1b78 2023-01-10 stsp 		iclient.session_child_pid = client->session->pid;
 444 f1752522 2022-10-29 stsp 
 445 f1752522 2022-10-29 stsp 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
 446 f1752522 2022-10-29 stsp 	    &iclient, sizeof(iclient)) == -1) {
 447 f1752522 2022-10-29 stsp 		err = got_error_from_errno("imsg compose INFO_CLIENT");
 448 f1752522 2022-10-29 stsp 		if (err)
 449 f1752522 2022-10-29 stsp 			return err;
 450 f1752522 2022-10-29 stsp 	}
 451 f1752522 2022-10-29 stsp 
 452 f1752522 2022-10-29 stsp 	return NULL;
 453 f1752522 2022-10-29 stsp }
 454 f1752522 2022-10-29 stsp 
 455 f1752522 2022-10-29 stsp static const struct got_error *
 456 f1752522 2022-10-29 stsp send_info(struct gotd_client *client)
 457 f1752522 2022-10-29 stsp {
 458 f1752522 2022-10-29 stsp 	const struct got_error *err = NULL;
 459 f1752522 2022-10-29 stsp 	struct gotd_imsg_info info;
 460 f1752522 2022-10-29 stsp 	uint64_t slot;
 461 f1752522 2022-10-29 stsp 	struct gotd_repo *repo;
 462 f1752522 2022-10-29 stsp 
 463 78433331 2023-01-04 stsp 	if (client->euid != 0)
 464 78433331 2023-01-04 stsp 		return got_error_set_errno(EPERM, "info");
 465 78433331 2023-01-04 stsp 
 466 f1752522 2022-10-29 stsp 	info.pid = gotd.pid;
 467 f1752522 2022-10-29 stsp 	info.verbosity = gotd.verbosity;
 468 f1752522 2022-10-29 stsp 	info.nrepos = gotd.nrepos;
 469 f1752522 2022-10-29 stsp 	info.nclients = client_cnt - 1;
 470 f1752522 2022-10-29 stsp 
 471 f1752522 2022-10-29 stsp 	if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
 472 f1752522 2022-10-29 stsp 	    &info, sizeof(info)) == -1) {
 473 f1752522 2022-10-29 stsp 		err = got_error_from_errno("imsg compose INFO");
 474 f1752522 2022-10-29 stsp 		if (err)
 475 f1752522 2022-10-29 stsp 			return err;
 476 f1752522 2022-10-29 stsp 	}
 477 f1752522 2022-10-29 stsp 
 478 f1752522 2022-10-29 stsp 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
 479 f1752522 2022-10-29 stsp 		err = send_repo_info(&client->iev, repo);
 480 f1752522 2022-10-29 stsp 		if (err)
 481 f1752522 2022-10-29 stsp 			return err;
 482 f1752522 2022-10-29 stsp 	}
 483 f1752522 2022-10-29 stsp 
 484 f1752522 2022-10-29 stsp 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
 485 f1752522 2022-10-29 stsp 		struct gotd_client *c;
 486 f1752522 2022-10-29 stsp 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
 487 f1752522 2022-10-29 stsp 			if (c->id == client->id)
 488 f1752522 2022-10-29 stsp 				continue;
 489 f1752522 2022-10-29 stsp 			err = send_client_info(&client->iev, c);
 490 f1752522 2022-10-29 stsp 			if (err)
 491 f1752522 2022-10-29 stsp 				return err;
 492 f1752522 2022-10-29 stsp 		}
 493 f1752522 2022-10-29 stsp 	}
 494 f1752522 2022-10-29 stsp 
 495 f1752522 2022-10-29 stsp 	return NULL;
 496 f1752522 2022-10-29 stsp }
 497 f1752522 2022-10-29 stsp 
 498 f1752522 2022-10-29 stsp static const struct got_error *
 499 f1752522 2022-10-29 stsp stop_gotd(struct gotd_client *client)
 500 f1752522 2022-10-29 stsp {
 501 f1752522 2022-10-29 stsp 
 502 f1752522 2022-10-29 stsp 	if (client->euid != 0)
 503 f1752522 2022-10-29 stsp 		return got_error_set_errno(EPERM, "stop");
 504 f1752522 2022-10-29 stsp 
 505 f1752522 2022-10-29 stsp 	gotd_shutdown();
 506 f1752522 2022-10-29 stsp 	/* NOTREACHED */
 507 0ccf3acb 2022-11-16 stsp 	return NULL;
 508 0ccf3acb 2022-11-16 stsp }
 509 0ccf3acb 2022-11-16 stsp 
 510 13b2bc37 2022-10-23 stsp static const struct got_error *
 511 ae7c1b78 2023-01-10 stsp start_client_authentication(struct gotd_client *client, struct imsg *imsg)
 512 13b2bc37 2022-10-23 stsp {
 513 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 514 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_list_refs ireq;
 515 0ccf3acb 2022-11-16 stsp 	struct gotd_repo *repo = NULL;
 516 13b2bc37 2022-10-23 stsp 	size_t datalen;
 517 13b2bc37 2022-10-23 stsp 
 518 13b2bc37 2022-10-23 stsp 	log_debug("list-refs request from uid %d", client->euid);
 519 13b2bc37 2022-10-23 stsp 
 520 eac23c30 2023-01-10 stsp 	if (client->state != GOTD_CLIENT_STATE_NEW)
 521 ae7c1b78 2023-01-10 stsp 		return got_error_msg(GOT_ERR_BAD_REQUEST,
 522 ae7c1b78 2023-01-10 stsp 		    "unexpected list-refs request received");
 523 ae7c1b78 2023-01-10 stsp 
 524 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 525 13b2bc37 2022-10-23 stsp 	if (datalen != sizeof(ireq))
 526 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
 527 13b2bc37 2022-10-23 stsp 
 528 13b2bc37 2022-10-23 stsp 	memcpy(&ireq, imsg->data, datalen);
 529 13b2bc37 2022-10-23 stsp 
 530 13b2bc37 2022-10-23 stsp 	if (ireq.client_is_reading) {
 531 13b2bc37 2022-10-23 stsp 		err = ensure_client_is_not_writing(client);
 532 13b2bc37 2022-10-23 stsp 		if (err)
 533 13b2bc37 2022-10-23 stsp 			return err;
 534 b09c1279 2023-03-28 stsp 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
 535 0ccf3acb 2022-11-16 stsp 		if (repo == NULL)
 536 0ccf3acb 2022-11-16 stsp 			return got_error(GOT_ERR_NOT_GIT_REPO);
 537 5e25db14 2022-12-29 stsp 		err = start_auth_child(client, GOTD_AUTH_READ, repo,
 538 b50a2b46 2022-12-29 stsp 		    gotd.argv0, gotd.confpath, gotd.daemonize,
 539 b50a2b46 2022-12-29 stsp 		    gotd.verbosity);
 540 b50a2b46 2022-12-29 stsp 		if (err)
 541 b50a2b46 2022-12-29 stsp 			return err;
 542 13b2bc37 2022-10-23 stsp 	} else {
 543 13b2bc37 2022-10-23 stsp 		err = ensure_client_is_not_reading(client);
 544 0ccf3acb 2022-11-16 stsp 		if (err)
 545 0ccf3acb 2022-11-16 stsp 			return err;
 546 b09c1279 2023-03-28 stsp 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
 547 0ccf3acb 2022-11-16 stsp 		if (repo == NULL)
 548 0ccf3acb 2022-11-16 stsp 			return got_error(GOT_ERR_NOT_GIT_REPO);
 549 5e25db14 2022-12-29 stsp 		err = start_auth_child(client,
 550 5e25db14 2022-12-29 stsp 		    GOTD_AUTH_READ | GOTD_AUTH_WRITE,
 551 5e25db14 2022-12-29 stsp 		    repo, gotd.argv0, gotd.confpath, gotd.daemonize,
 552 b50a2b46 2022-12-29 stsp 		    gotd.verbosity);
 553 b50a2b46 2022-12-29 stsp 		if (err)
 554 b50a2b46 2022-12-29 stsp 			return err;
 555 13b2bc37 2022-10-23 stsp 	}
 556 13b2bc37 2022-10-23 stsp 
 557 ae7c1b78 2023-01-10 stsp 	evtimer_add(&client->tmo, &auth_timeout);
 558 13b2bc37 2022-10-23 stsp 
 559 5fb50fce 2023-07-14 stsp 	/* Flow continues upon authentication success/failure or timeout. */
 560 13b2bc37 2022-10-23 stsp 	return NULL;
 561 13b2bc37 2022-10-23 stsp }
 562 13b2bc37 2022-10-23 stsp 
 563 13b2bc37 2022-10-23 stsp static void
 564 13b2bc37 2022-10-23 stsp gotd_request(int fd, short events, void *arg)
 565 13b2bc37 2022-10-23 stsp {
 566 13b2bc37 2022-10-23 stsp 	struct gotd_imsgev *iev = arg;
 567 13b2bc37 2022-10-23 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
 568 13b2bc37 2022-10-23 stsp 	struct gotd_client *client = iev->handler_arg;
 569 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 570 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
 571 13b2bc37 2022-10-23 stsp 	ssize_t n;
 572 13b2bc37 2022-10-23 stsp 
 573 13b2bc37 2022-10-23 stsp 	if (events & EV_WRITE) {
 574 13b2bc37 2022-10-23 stsp 		while (ibuf->w.queued) {
 575 13b2bc37 2022-10-23 stsp 			n = msgbuf_write(&ibuf->w);
 576 13b2bc37 2022-10-23 stsp 			if (n == -1 && errno == EPIPE) {
 577 13b2bc37 2022-10-23 stsp 				/*
 578 13b2bc37 2022-10-23 stsp 				 * The client has closed its socket.
 579 13b2bc37 2022-10-23 stsp 				 * This can happen when Git clients are
 580 13b2bc37 2022-10-23 stsp 				 * done sending pack file data.
 581 77d0cae1 2022-12-30 op 				 */
 582 13b2bc37 2022-10-23 stsp 				msgbuf_clear(&ibuf->w);
 583 13b2bc37 2022-10-23 stsp 				continue;
 584 13b2bc37 2022-10-23 stsp 			} else if (n == -1 && errno != EAGAIN) {
 585 13b2bc37 2022-10-23 stsp 				err = got_error_from_errno("imsg_flush");
 586 13b2bc37 2022-10-23 stsp 				disconnect_on_error(client, err);
 587 13b2bc37 2022-10-23 stsp 				return;
 588 13b2bc37 2022-10-23 stsp 			}
 589 13b2bc37 2022-10-23 stsp 			if (n == 0) {
 590 13b2bc37 2022-10-23 stsp 				/* Connection closed. */
 591 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_EOF);
 592 13b2bc37 2022-10-23 stsp 				disconnect_on_error(client, err);
 593 13b2bc37 2022-10-23 stsp 				return;
 594 13b2bc37 2022-10-23 stsp 			}
 595 13b2bc37 2022-10-23 stsp 		}
 596 f1752522 2022-10-29 stsp 
 597 f1752522 2022-10-29 stsp 		/* Disconnect gotctl(8) now that messages have been sent. */
 598 f1752522 2022-10-29 stsp 		if (!client_is_reading(client) && !client_is_writing(client)) {
 599 f1752522 2022-10-29 stsp 			disconnect(client);
 600 f1752522 2022-10-29 stsp 			return;
 601 f1752522 2022-10-29 stsp 		}
 602 13b2bc37 2022-10-23 stsp 	}
 603 13b2bc37 2022-10-23 stsp 
 604 13b2bc37 2022-10-23 stsp 	if ((events & EV_READ) == 0)
 605 13b2bc37 2022-10-23 stsp 		return;
 606 13b2bc37 2022-10-23 stsp 
 607 13b2bc37 2022-10-23 stsp 	memset(&imsg, 0, sizeof(imsg));
 608 13b2bc37 2022-10-23 stsp 
 609 13b2bc37 2022-10-23 stsp 	while (err == NULL) {
 610 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_recv(&imsg, ibuf, 0);
 611 13b2bc37 2022-10-23 stsp 		if (err) {
 612 13b2bc37 2022-10-23 stsp 			if (err->code == GOT_ERR_PRIVSEP_READ)
 613 13b2bc37 2022-10-23 stsp 				err = NULL;
 614 13b2bc37 2022-10-23 stsp 			break;
 615 13b2bc37 2022-10-23 stsp 		}
 616 13b2bc37 2022-10-23 stsp 
 617 13b2bc37 2022-10-23 stsp 		evtimer_del(&client->tmo);
 618 13b2bc37 2022-10-23 stsp 
 619 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
 620 f1752522 2022-10-29 stsp 		case GOTD_IMSG_INFO:
 621 f1752522 2022-10-29 stsp 			err = send_info(client);
 622 f1752522 2022-10-29 stsp 			break;
 623 f1752522 2022-10-29 stsp 		case GOTD_IMSG_STOP:
 624 f1752522 2022-10-29 stsp 			err = stop_gotd(client);
 625 f1752522 2022-10-29 stsp 			break;
 626 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_LIST_REFS:
 627 ae7c1b78 2023-01-10 stsp 			err = start_client_authentication(client, &imsg);
 628 13b2bc37 2022-10-23 stsp 			break;
 629 13b2bc37 2022-10-23 stsp 		default:
 630 ae7c1b78 2023-01-10 stsp 			log_debug("unexpected imsg %d", imsg.hdr.type);
 631 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
 632 13b2bc37 2022-10-23 stsp 			break;
 633 13b2bc37 2022-10-23 stsp 		}
 634 13b2bc37 2022-10-23 stsp 
 635 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
 636 13b2bc37 2022-10-23 stsp 	}
 637 13b2bc37 2022-10-23 stsp 
 638 13b2bc37 2022-10-23 stsp 	if (err) {
 639 b5225f29 2023-01-22 op 		disconnect_on_error(client, err);
 640 13b2bc37 2022-10-23 stsp 	} else {
 641 13b2bc37 2022-10-23 stsp 		gotd_imsg_event_add(&client->iev);
 642 13b2bc37 2022-10-23 stsp 	}
 643 13b2bc37 2022-10-23 stsp }
 644 13b2bc37 2022-10-23 stsp 
 645 13b2bc37 2022-10-23 stsp static void
 646 ae7c1b78 2023-01-10 stsp gotd_auth_timeout(int fd, short events, void *arg)
 647 13b2bc37 2022-10-23 stsp {
 648 13b2bc37 2022-10-23 stsp 	struct gotd_client *client = arg;
 649 13b2bc37 2022-10-23 stsp 
 650 ae7c1b78 2023-01-10 stsp 	log_debug("disconnecting uid %d due to authentication timeout",
 651 ae7c1b78 2023-01-10 stsp 	    client->euid);
 652 13b2bc37 2022-10-23 stsp 	disconnect(client);
 653 13b2bc37 2022-10-23 stsp }
 654 13b2bc37 2022-10-23 stsp 
 655 d93ecf7d 2022-12-14 stsp static const struct got_error *
 656 d93ecf7d 2022-12-14 stsp recv_connect(uint32_t *client_id, struct imsg *imsg)
 657 13b2bc37 2022-10-23 stsp {
 658 d93ecf7d 2022-12-14 stsp 	const struct got_error *err = NULL;
 659 d93ecf7d 2022-12-14 stsp 	struct gotd_imsg_connect iconnect;
 660 d93ecf7d 2022-12-14 stsp 	size_t datalen;
 661 13b2bc37 2022-10-23 stsp 	int s = -1;
 662 13b2bc37 2022-10-23 stsp 	struct gotd_client *client = NULL;
 663 13b2bc37 2022-10-23 stsp 
 664 d93ecf7d 2022-12-14 stsp 	*client_id = 0;
 665 13b2bc37 2022-10-23 stsp 
 666 d93ecf7d 2022-12-14 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 667 d93ecf7d 2022-12-14 stsp 	if (datalen != sizeof(iconnect))
 668 d93ecf7d 2022-12-14 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
 669 d93ecf7d 2022-12-14 stsp 	memcpy(&iconnect, imsg->data, sizeof(iconnect));
 670 13b2bc37 2022-10-23 stsp 
 671 2c52c623 2024-01-30 op 	s = imsg_get_fd(imsg);
 672 13b2bc37 2022-10-23 stsp 	if (s == -1) {
 673 d93ecf7d 2022-12-14 stsp 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
 674 d93ecf7d 2022-12-14 stsp 		goto done;
 675 13b2bc37 2022-10-23 stsp 	}
 676 13b2bc37 2022-10-23 stsp 
 677 d93ecf7d 2022-12-14 stsp 	if (find_client(iconnect.client_id)) {
 678 d93ecf7d 2022-12-14 stsp 		err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
 679 d93ecf7d 2022-12-14 stsp 		goto done;
 680 d93ecf7d 2022-12-14 stsp 	}
 681 13b2bc37 2022-10-23 stsp 
 682 13b2bc37 2022-10-23 stsp 	client = calloc(1, sizeof(*client));
 683 13b2bc37 2022-10-23 stsp 	if (client == NULL) {
 684 d93ecf7d 2022-12-14 stsp 		err = got_error_from_errno("calloc");
 685 d93ecf7d 2022-12-14 stsp 		goto done;
 686 13b2bc37 2022-10-23 stsp 	}
 687 13b2bc37 2022-10-23 stsp 
 688 d93ecf7d 2022-12-14 stsp 	*client_id = iconnect.client_id;
 689 d93ecf7d 2022-12-14 stsp 
 690 eac23c30 2023-01-10 stsp 	client->state = GOTD_CLIENT_STATE_NEW;
 691 d93ecf7d 2022-12-14 stsp 	client->id = iconnect.client_id;
 692 13b2bc37 2022-10-23 stsp 	client->fd = s;
 693 13b2bc37 2022-10-23 stsp 	s = -1;
 694 365cf0f3 2022-12-29 stsp 	/* The auth process will verify UID/GID for us. */
 695 365cf0f3 2022-12-29 stsp 	client->euid = iconnect.euid;
 696 365cf0f3 2022-12-29 stsp 	client->egid = iconnect.egid;
 697 13b2bc37 2022-10-23 stsp 
 698 13b2bc37 2022-10-23 stsp 	imsg_init(&client->iev.ibuf, client->fd);
 699 13b2bc37 2022-10-23 stsp 	client->iev.handler = gotd_request;
 700 13b2bc37 2022-10-23 stsp 	client->iev.events = EV_READ;
 701 13b2bc37 2022-10-23 stsp 	client->iev.handler_arg = client;
 702 13b2bc37 2022-10-23 stsp 
 703 13b2bc37 2022-10-23 stsp 	event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
 704 13b2bc37 2022-10-23 stsp 	    &client->iev);
 705 13b2bc37 2022-10-23 stsp 	gotd_imsg_event_add(&client->iev);
 706 13b2bc37 2022-10-23 stsp 
 707 ae7c1b78 2023-01-10 stsp 	evtimer_set(&client->tmo, gotd_auth_timeout, client);
 708 13b2bc37 2022-10-23 stsp 
 709 13b2bc37 2022-10-23 stsp 	add_client(client);
 710 13b2bc37 2022-10-23 stsp 	log_debug("%s: new client uid %d connected on fd %d", __func__,
 711 13b2bc37 2022-10-23 stsp 	    client->euid, client->fd);
 712 d93ecf7d 2022-12-14 stsp done:
 713 d93ecf7d 2022-12-14 stsp 	if (err) {
 714 c929736a 2023-06-22 op 		struct gotd_child_proc *listen_proc = gotd.listen_proc;
 715 d93ecf7d 2022-12-14 stsp 		struct gotd_imsg_disconnect idisconnect;
 716 13b2bc37 2022-10-23 stsp 
 717 d93ecf7d 2022-12-14 stsp 		idisconnect.client_id = client->id;
 718 d93ecf7d 2022-12-14 stsp 		if (gotd_imsg_compose_event(&listen_proc->iev,
 719 d93ecf7d 2022-12-14 stsp 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
 720 d93ecf7d 2022-12-14 stsp 		    &idisconnect, sizeof(idisconnect)) == -1)
 721 d93ecf7d 2022-12-14 stsp 			log_warn("imsg compose DISCONNECT");
 722 d93ecf7d 2022-12-14 stsp 
 723 d93ecf7d 2022-12-14 stsp 		if (s != -1)
 724 d93ecf7d 2022-12-14 stsp 			close(s);
 725 d93ecf7d 2022-12-14 stsp 	}
 726 d93ecf7d 2022-12-14 stsp 
 727 d93ecf7d 2022-12-14 stsp 	return err;
 728 13b2bc37 2022-10-23 stsp }
 729 13b2bc37 2022-10-23 stsp 
 730 13b2bc37 2022-10-23 stsp static const char *gotd_proc_names[PROC_MAX] = {
 731 13b2bc37 2022-10-23 stsp 	"parent",
 732 d93ecf7d 2022-12-14 stsp 	"listen",
 733 5e25db14 2022-12-29 stsp 	"auth",
 734 ce986f22 2023-06-19 stsp 	"session_read",
 735 ce986f22 2023-06-19 stsp 	"session_write",
 736 13b2bc37 2022-10-23 stsp 	"repo_read",
 737 4b3827cd 2023-07-08 stsp 	"repo_write",
 738 4b3827cd 2023-07-08 stsp 	"gitwrapper"
 739 13b2bc37 2022-10-23 stsp };
 740 13b2bc37 2022-10-23 stsp 
 741 13b2bc37 2022-10-23 stsp static void
 742 13b2bc37 2022-10-23 stsp kill_proc(struct gotd_child_proc *proc, int fatal)
 743 13b2bc37 2022-10-23 stsp {
 744 839338f6 2023-06-22 op 	struct timeval tv = { 5, 0 };
 745 839338f6 2023-06-22 op 
 746 839338f6 2023-06-22 op 	log_debug("kill -%d %d", fatal ? SIGKILL : SIGTERM, proc->pid);
 747 839338f6 2023-06-22 op 
 748 839338f6 2023-06-22 op 	if (proc->iev.ibuf.fd != -1) {
 749 839338f6 2023-06-22 op 		event_del(&proc->iev.ev);
 750 839338f6 2023-06-22 op 		msgbuf_clear(&proc->iev.ibuf.w);
 751 839338f6 2023-06-22 op 		close(proc->iev.ibuf.fd);
 752 839338f6 2023-06-22 op 		proc->iev.ibuf.fd = -1;
 753 839338f6 2023-06-22 op 	}
 754 839338f6 2023-06-22 op 
 755 839338f6 2023-06-22 op 	if (!evtimer_pending(&proc->tmo, NULL) && !fatal)
 756 839338f6 2023-06-22 op 		evtimer_add(&proc->tmo, &tv);
 757 839338f6 2023-06-22 op 
 758 13b2bc37 2022-10-23 stsp 	if (fatal) {
 759 13b2bc37 2022-10-23 stsp 		log_warnx("sending SIGKILL to PID %d", proc->pid);
 760 13b2bc37 2022-10-23 stsp 		kill(proc->pid, SIGKILL);
 761 13b2bc37 2022-10-23 stsp 	} else
 762 13b2bc37 2022-10-23 stsp 		kill(proc->pid, SIGTERM);
 763 13b2bc37 2022-10-23 stsp }
 764 13b2bc37 2022-10-23 stsp 
 765 13b2bc37 2022-10-23 stsp static void
 766 839338f6 2023-06-22 op kill_proc_timeout(int fd, short ev, void *d)
 767 839338f6 2023-06-22 op {
 768 839338f6 2023-06-22 op 	struct gotd_child_proc *proc = d;
 769 839338f6 2023-06-22 op 
 770 839338f6 2023-06-22 op 	log_warnx("timeout waiting for PID %d to terminate;"
 771 839338f6 2023-06-22 op 	    " retrying with force", proc->pid);
 772 839338f6 2023-06-22 op 	kill_proc(proc, 1);
 773 839338f6 2023-06-22 op }
 774 839338f6 2023-06-22 op 
 775 839338f6 2023-06-22 op static void
 776 13b2bc37 2022-10-23 stsp gotd_shutdown(void)
 777 13b2bc37 2022-10-23 stsp {
 778 b50a2b46 2022-12-29 stsp 	uint64_t slot;
 779 13b2bc37 2022-10-23 stsp 
 780 ae7c1b78 2023-01-10 stsp 	log_debug("shutting down");
 781 b50a2b46 2022-12-29 stsp 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
 782 b50a2b46 2022-12-29 stsp 		struct gotd_client *c, *tmp;
 783 b50a2b46 2022-12-29 stsp 
 784 b50a2b46 2022-12-29 stsp 		STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
 785 b50a2b46 2022-12-29 stsp 			disconnect(c);
 786 13b2bc37 2022-10-23 stsp 	}
 787 13b2bc37 2022-10-23 stsp 
 788 839338f6 2023-06-22 op 	kill_proc(gotd.listen_proc, 0);
 789 13b2bc37 2022-10-23 stsp 
 790 13b2bc37 2022-10-23 stsp 	log_info("terminating");
 791 13b2bc37 2022-10-23 stsp 	exit(0);
 792 13b2bc37 2022-10-23 stsp }
 793 13b2bc37 2022-10-23 stsp 
 794 839338f6 2023-06-22 op static struct gotd_child_proc *
 795 839338f6 2023-06-22 op find_proc_by_pid(pid_t pid)
 796 839338f6 2023-06-22 op {
 797 839338f6 2023-06-22 op 	struct gotd_child_proc *proc = NULL;
 798 839338f6 2023-06-22 op 
 799 839338f6 2023-06-22 op 	TAILQ_FOREACH(proc, &procs, entry)
 800 839338f6 2023-06-22 op 		if (proc->pid == pid)
 801 839338f6 2023-06-22 op 			break;
 802 839338f6 2023-06-22 op 
 803 839338f6 2023-06-22 op 	return proc;
 804 839338f6 2023-06-22 op }
 805 839338f6 2023-06-22 op 
 806 13b2bc37 2022-10-23 stsp void
 807 13b2bc37 2022-10-23 stsp gotd_sighdlr(int sig, short event, void *arg)
 808 13b2bc37 2022-10-23 stsp {
 809 839338f6 2023-06-22 op 	struct gotd_child_proc *proc;
 810 839338f6 2023-06-22 op 	pid_t pid;
 811 839338f6 2023-06-22 op 	int status;
 812 839338f6 2023-06-22 op 
 813 13b2bc37 2022-10-23 stsp 	/*
 814 13b2bc37 2022-10-23 stsp 	 * Normal signal handler rules don't apply because libevent
 815 13b2bc37 2022-10-23 stsp 	 * decouples for us.
 816 13b2bc37 2022-10-23 stsp 	 */
 817 13b2bc37 2022-10-23 stsp 
 818 13b2bc37 2022-10-23 stsp 	switch (sig) {
 819 13b2bc37 2022-10-23 stsp 	case SIGHUP:
 820 13b2bc37 2022-10-23 stsp 		log_info("%s: ignoring SIGHUP", __func__);
 821 13b2bc37 2022-10-23 stsp 		break;
 822 13b2bc37 2022-10-23 stsp 	case SIGUSR1:
 823 13b2bc37 2022-10-23 stsp 		log_info("%s: ignoring SIGUSR1", __func__);
 824 13b2bc37 2022-10-23 stsp 		break;
 825 13b2bc37 2022-10-23 stsp 	case SIGTERM:
 826 13b2bc37 2022-10-23 stsp 	case SIGINT:
 827 13b2bc37 2022-10-23 stsp 		gotd_shutdown();
 828 13b2bc37 2022-10-23 stsp 		break;
 829 839338f6 2023-06-22 op 	case SIGCHLD:
 830 839338f6 2023-06-22 op 		for (;;) {
 831 839338f6 2023-06-22 op 			pid = waitpid(WAIT_ANY, &status, WNOHANG);
 832 839338f6 2023-06-22 op 			if (pid == -1) {
 833 839338f6 2023-06-22 op 				if (errno == EINTR)
 834 839338f6 2023-06-22 op 					continue;
 835 839338f6 2023-06-22 op 				if (errno == ECHILD)
 836 839338f6 2023-06-22 op 					break;
 837 839338f6 2023-06-22 op 				fatal("waitpid");
 838 839338f6 2023-06-22 op 			}
 839 839338f6 2023-06-22 op 			if (pid == 0)
 840 839338f6 2023-06-22 op 				break;
 841 839338f6 2023-06-22 op 
 842 839338f6 2023-06-22 op 			log_debug("reaped pid %d", pid);
 843 839338f6 2023-06-22 op 			proc = find_proc_by_pid(pid);
 844 839338f6 2023-06-22 op 			if (proc == NULL) {
 845 839338f6 2023-06-22 op 				log_info("caught exit of unknown child %d",
 846 839338f6 2023-06-22 op 				    pid);
 847 839338f6 2023-06-22 op 				continue;
 848 839338f6 2023-06-22 op 			}
 849 839338f6 2023-06-22 op 
 850 839338f6 2023-06-22 op 			if (WIFSIGNALED(status)) {
 851 839338f6 2023-06-22 op 				log_warnx("child PID %d terminated with"
 852 839338f6 2023-06-22 op 				    " signal %d", pid, WTERMSIG(status));
 853 839338f6 2023-06-22 op 			}
 854 839338f6 2023-06-22 op 
 855 839338f6 2023-06-22 op 			proc_done(proc);
 856 839338f6 2023-06-22 op 		}
 857 839338f6 2023-06-22 op 		break;
 858 13b2bc37 2022-10-23 stsp 	default:
 859 13b2bc37 2022-10-23 stsp 		fatalx("unexpected signal");
 860 13b2bc37 2022-10-23 stsp 	}
 861 13b2bc37 2022-10-23 stsp }
 862 13b2bc37 2022-10-23 stsp 
 863 13b2bc37 2022-10-23 stsp static const struct got_error *
 864 13b2bc37 2022-10-23 stsp ensure_proc_is_reading(struct gotd_client *client,
 865 13b2bc37 2022-10-23 stsp     struct gotd_child_proc *proc)
 866 13b2bc37 2022-10-23 stsp {
 867 13b2bc37 2022-10-23 stsp 	if (!client_is_reading(client)) {
 868 13b2bc37 2022-10-23 stsp 		kill_proc(proc, 1);
 869 13b2bc37 2022-10-23 stsp 		return got_error_fmt(GOT_ERR_BAD_PACKET,
 870 13b2bc37 2022-10-23 stsp 		    "PID %d handled a read-request for uid %d but this "
 871 13b2bc37 2022-10-23 stsp 		    "user is not reading from a repository", proc->pid,
 872 13b2bc37 2022-10-23 stsp 		    client->euid);
 873 13b2bc37 2022-10-23 stsp 	}
 874 13b2bc37 2022-10-23 stsp 
 875 13b2bc37 2022-10-23 stsp 	return NULL;
 876 13b2bc37 2022-10-23 stsp }
 877 13b2bc37 2022-10-23 stsp 
 878 13b2bc37 2022-10-23 stsp static const struct got_error *
 879 13b2bc37 2022-10-23 stsp ensure_proc_is_writing(struct gotd_client *client,
 880 13b2bc37 2022-10-23 stsp     struct gotd_child_proc *proc)
 881 13b2bc37 2022-10-23 stsp {
 882 13b2bc37 2022-10-23 stsp 	if (!client_is_writing(client)) {
 883 13b2bc37 2022-10-23 stsp 		kill_proc(proc, 1);
 884 13b2bc37 2022-10-23 stsp 		return got_error_fmt(GOT_ERR_BAD_PACKET,
 885 13b2bc37 2022-10-23 stsp 		    "PID %d handled a write-request for uid %d but this "
 886 13b2bc37 2022-10-23 stsp 		    "user is not writing to a repository", proc->pid,
 887 13b2bc37 2022-10-23 stsp 		    client->euid);
 888 13b2bc37 2022-10-23 stsp 	}
 889 13b2bc37 2022-10-23 stsp 
 890 13b2bc37 2022-10-23 stsp 	return NULL;
 891 13b2bc37 2022-10-23 stsp }
 892 13b2bc37 2022-10-23 stsp 
 893 13b2bc37 2022-10-23 stsp static int
 894 13b2bc37 2022-10-23 stsp verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
 895 13b2bc37 2022-10-23 stsp     struct imsg *imsg)
 896 13b2bc37 2022-10-23 stsp {
 897 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 898 13b2bc37 2022-10-23 stsp 	int ret = 0;
 899 13b2bc37 2022-10-23 stsp 
 900 d93ecf7d 2022-12-14 stsp 	if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
 901 f7a854cf 2023-01-10 stsp 		if (client->repo == NULL)
 902 d93ecf7d 2022-12-14 stsp 			fatalx("no process found for uid %d", client->euid);
 903 f7a854cf 2023-01-10 stsp 		if (proc->pid != client->repo->pid) {
 904 d93ecf7d 2022-12-14 stsp 			kill_proc(proc, 1);
 905 d93ecf7d 2022-12-14 stsp 			log_warnx("received message from PID %d for uid %d, "
 906 d93ecf7d 2022-12-14 stsp 			    "while PID %d is the process serving this user",
 907 f7a854cf 2023-01-10 stsp 			    proc->pid, client->euid, client->repo->pid);
 908 ae7c1b78 2023-01-10 stsp 			return 0;
 909 ae7c1b78 2023-01-10 stsp 		}
 910 ae7c1b78 2023-01-10 stsp 	}
 911 b0614828 2023-06-19 stsp 	if (proc->type == PROC_SESSION_READ ||
 912 b0614828 2023-06-19 stsp 	    proc->type == PROC_SESSION_WRITE) {
 913 ae7c1b78 2023-01-10 stsp 		if (client->session == NULL) {
 914 ae7c1b78 2023-01-10 stsp 			log_warnx("no session found for uid %d", client->euid);
 915 d93ecf7d 2022-12-14 stsp 			return 0;
 916 d93ecf7d 2022-12-14 stsp 		}
 917 ae7c1b78 2023-01-10 stsp 		if (proc->pid != client->session->pid) {
 918 ae7c1b78 2023-01-10 stsp 			kill_proc(proc, 1);
 919 ae7c1b78 2023-01-10 stsp 			log_warnx("received message from PID %d for uid %d, "
 920 ae7c1b78 2023-01-10 stsp 			    "while PID %d is the process serving this user",
 921 ae7c1b78 2023-01-10 stsp 			    proc->pid, client->euid, client->session->pid);
 922 ae7c1b78 2023-01-10 stsp 			return 0;
 923 ae7c1b78 2023-01-10 stsp 		}
 924 13b2bc37 2022-10-23 stsp 	}
 925 13b2bc37 2022-10-23 stsp 
 926 13b2bc37 2022-10-23 stsp 	switch (imsg->hdr.type) {
 927 13b2bc37 2022-10-23 stsp 	case GOTD_IMSG_ERROR:
 928 13b2bc37 2022-10-23 stsp 		ret = 1;
 929 13b2bc37 2022-10-23 stsp 		break;
 930 d93ecf7d 2022-12-14 stsp 	case GOTD_IMSG_CONNECT:
 931 d93ecf7d 2022-12-14 stsp 		if (proc->type != PROC_LISTEN) {
 932 d93ecf7d 2022-12-14 stsp 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
 933 d93ecf7d 2022-12-14 stsp 			    "new connection for uid %d from PID %d "
 934 d93ecf7d 2022-12-14 stsp 			    "which is not the listen process",
 935 76a9a38e 2023-12-27 stsp 			    client->euid, proc->pid);
 936 5e25db14 2022-12-29 stsp 		} else
 937 5e25db14 2022-12-29 stsp 			ret = 1;
 938 5e25db14 2022-12-29 stsp 		break;
 939 5e25db14 2022-12-29 stsp 	case GOTD_IMSG_ACCESS_GRANTED:
 940 5e25db14 2022-12-29 stsp 		if (proc->type != PROC_AUTH) {
 941 5e25db14 2022-12-29 stsp 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
 942 5e25db14 2022-12-29 stsp 			    "authentication of uid %d from PID %d "
 943 5e25db14 2022-12-29 stsp 			    "which is not the auth process",
 944 76a9a38e 2023-12-27 stsp 			    client->euid, proc->pid);
 945 d93ecf7d 2022-12-14 stsp 		} else
 946 d93ecf7d 2022-12-14 stsp 			ret = 1;
 947 d93ecf7d 2022-12-14 stsp 		break;
 948 ae7c1b78 2023-01-10 stsp 	case GOTD_IMSG_CLIENT_SESSION_READY:
 949 b0614828 2023-06-19 stsp 		if (proc->type != PROC_SESSION_READ &&
 950 b0614828 2023-06-19 stsp 		    proc->type != PROC_SESSION_WRITE) {
 951 ae7c1b78 2023-01-10 stsp 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
 952 ae7c1b78 2023-01-10 stsp 			    "unexpected \"ready\" signal from PID %d",
 953 ae7c1b78 2023-01-10 stsp 			    proc->pid);
 954 ae7c1b78 2023-01-10 stsp 		} else
 955 ae7c1b78 2023-01-10 stsp 			ret = 1;
 956 ae7c1b78 2023-01-10 stsp 		break;
 957 b50a2b46 2022-12-29 stsp 	case GOTD_IMSG_REPO_CHILD_READY:
 958 b50a2b46 2022-12-29 stsp 		if (proc->type != PROC_REPO_READ &&
 959 b50a2b46 2022-12-29 stsp 		    proc->type != PROC_REPO_WRITE) {
 960 b50a2b46 2022-12-29 stsp 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
 961 b50a2b46 2022-12-29 stsp 			    "unexpected \"ready\" signal from PID %d",
 962 b50a2b46 2022-12-29 stsp 			    proc->pid);
 963 b50a2b46 2022-12-29 stsp 		} else
 964 b50a2b46 2022-12-29 stsp 			ret = 1;
 965 b50a2b46 2022-12-29 stsp 		break;
 966 13b2bc37 2022-10-23 stsp 	case GOTD_IMSG_PACKFILE_DONE:
 967 13b2bc37 2022-10-23 stsp 		err = ensure_proc_is_reading(client, proc);
 968 13b2bc37 2022-10-23 stsp 		if (err)
 969 13b2bc37 2022-10-23 stsp 			log_warnx("uid %d: %s", client->euid, err->msg);
 970 13b2bc37 2022-10-23 stsp 		else
 971 13b2bc37 2022-10-23 stsp 			ret = 1;
 972 13b2bc37 2022-10-23 stsp 		break;
 973 13b2bc37 2022-10-23 stsp 	case GOTD_IMSG_PACKFILE_INSTALL:
 974 13b2bc37 2022-10-23 stsp 	case GOTD_IMSG_REF_UPDATES_START:
 975 13b2bc37 2022-10-23 stsp 	case GOTD_IMSG_REF_UPDATE:
 976 13b2bc37 2022-10-23 stsp 		err = ensure_proc_is_writing(client, proc);
 977 13b2bc37 2022-10-23 stsp 		if (err)
 978 13b2bc37 2022-10-23 stsp 			log_warnx("uid %d: %s", client->euid, err->msg);
 979 13b2bc37 2022-10-23 stsp 		else
 980 13b2bc37 2022-10-23 stsp 			ret = 1;
 981 13b2bc37 2022-10-23 stsp 		break;
 982 13b2bc37 2022-10-23 stsp 	default:
 983 13b2bc37 2022-10-23 stsp 		log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
 984 13b2bc37 2022-10-23 stsp 		break;
 985 13b2bc37 2022-10-23 stsp 	}
 986 13b2bc37 2022-10-23 stsp 
 987 13b2bc37 2022-10-23 stsp 	return ret;
 988 13b2bc37 2022-10-23 stsp }
 989 13b2bc37 2022-10-23 stsp 
 990 13b2bc37 2022-10-23 stsp static const struct got_error *
 991 ae7c1b78 2023-01-10 stsp connect_repo_child(struct gotd_client *client,
 992 ae7c1b78 2023-01-10 stsp     struct gotd_child_proc *repo_proc)
 993 b50a2b46 2022-12-29 stsp {
 994 b50a2b46 2022-12-29 stsp 	static const struct got_error *err;
 995 ae7c1b78 2023-01-10 stsp 	struct gotd_imsgev *session_iev = &client->session->iev;
 996 ae7c1b78 2023-01-10 stsp 	struct gotd_imsg_connect_repo_child ireq;
 997 ae7c1b78 2023-01-10 stsp 	int pipe[2];
 998 b50a2b46 2022-12-29 stsp 
 999 eac23c30 2023-01-10 stsp 	if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED)
1000 ae7c1b78 2023-01-10 stsp 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1001 ae7c1b78 2023-01-10 stsp 		    "unexpected repo child ready signal received");
1002 b50a2b46 2022-12-29 stsp 
1003 ae7c1b78 2023-01-10 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1004 ae7c1b78 2023-01-10 stsp 	    PF_UNSPEC, pipe) == -1)
1005 ae7c1b78 2023-01-10 stsp 		fatal("socketpair");
1006 b50a2b46 2022-12-29 stsp 
1007 ae7c1b78 2023-01-10 stsp 	memset(&ireq, 0, sizeof(ireq));
1008 ae7c1b78 2023-01-10 stsp 	ireq.client_id = client->id;
1009 ae7c1b78 2023-01-10 stsp 	ireq.proc_id = repo_proc->type;
1010 13b2bc37 2022-10-23 stsp 
1011 ae7c1b78 2023-01-10 stsp 	/* Pass repo child pipe to session child process. */
1012 ae7c1b78 2023-01-10 stsp 	if (gotd_imsg_compose_event(session_iev, GOTD_IMSG_CONNECT_REPO_CHILD,
1013 ae7c1b78 2023-01-10 stsp 	    PROC_GOTD, pipe[0], &ireq, sizeof(ireq)) == -1) {
1014 ae7c1b78 2023-01-10 stsp 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1015 ae7c1b78 2023-01-10 stsp 		close(pipe[0]);
1016 ae7c1b78 2023-01-10 stsp 		close(pipe[1]);
1017 ae7c1b78 2023-01-10 stsp 		return err;
1018 13b2bc37 2022-10-23 stsp 	}
1019 13b2bc37 2022-10-23 stsp 
1020 ae7c1b78 2023-01-10 stsp 	/* Pass session child pipe to repo child process. */
1021 ae7c1b78 2023-01-10 stsp 	if (gotd_imsg_compose_event(&repo_proc->iev,
1022 ae7c1b78 2023-01-10 stsp 	    GOTD_IMSG_CONNECT_REPO_CHILD, PROC_GOTD, pipe[1], NULL, 0) == -1) {
1023 ae7c1b78 2023-01-10 stsp 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1024 ae7c1b78 2023-01-10 stsp 		close(pipe[1]);
1025 ae7c1b78 2023-01-10 stsp 		return err;
1026 13b2bc37 2022-10-23 stsp 	}
1027 13b2bc37 2022-10-23 stsp 
1028 13b2bc37 2022-10-23 stsp 	return NULL;
1029 13b2bc37 2022-10-23 stsp }
1030 13b2bc37 2022-10-23 stsp 
1031 13b2bc37 2022-10-23 stsp static void
1032 b50a2b46 2022-12-29 stsp gotd_dispatch_listener(int fd, short event, void *arg)
1033 13b2bc37 2022-10-23 stsp {
1034 13b2bc37 2022-10-23 stsp 	struct gotd_imsgev *iev = arg;
1035 13b2bc37 2022-10-23 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
1036 c929736a 2023-06-22 op 	struct gotd_child_proc *proc = gotd.listen_proc;
1037 b50a2b46 2022-12-29 stsp 	ssize_t n;
1038 b50a2b46 2022-12-29 stsp 	int shut = 0;
1039 b50a2b46 2022-12-29 stsp 	struct imsg imsg;
1040 b50a2b46 2022-12-29 stsp 
1041 b50a2b46 2022-12-29 stsp 	if (proc->iev.ibuf.fd != fd)
1042 b50a2b46 2022-12-29 stsp 		fatalx("%s: unexpected fd %d", __func__, fd);
1043 b50a2b46 2022-12-29 stsp 
1044 b50a2b46 2022-12-29 stsp 	if (event & EV_READ) {
1045 b50a2b46 2022-12-29 stsp 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1046 b50a2b46 2022-12-29 stsp 			fatal("imsg_read error");
1047 b50a2b46 2022-12-29 stsp 		if (n == 0) {
1048 b50a2b46 2022-12-29 stsp 			/* Connection closed. */
1049 b50a2b46 2022-12-29 stsp 			shut = 1;
1050 b50a2b46 2022-12-29 stsp 			goto done;
1051 b50a2b46 2022-12-29 stsp 		}
1052 b50a2b46 2022-12-29 stsp 	}
1053 b50a2b46 2022-12-29 stsp 
1054 b50a2b46 2022-12-29 stsp 	if (event & EV_WRITE) {
1055 b50a2b46 2022-12-29 stsp 		n = msgbuf_write(&ibuf->w);
1056 b50a2b46 2022-12-29 stsp 		if (n == -1 && errno != EAGAIN)
1057 b50a2b46 2022-12-29 stsp 			fatal("msgbuf_write");
1058 b50a2b46 2022-12-29 stsp 		if (n == 0) {
1059 b50a2b46 2022-12-29 stsp 			/* Connection closed. */
1060 b50a2b46 2022-12-29 stsp 			shut = 1;
1061 b50a2b46 2022-12-29 stsp 			goto done;
1062 b50a2b46 2022-12-29 stsp 		}
1063 b50a2b46 2022-12-29 stsp 	}
1064 b50a2b46 2022-12-29 stsp 
1065 b50a2b46 2022-12-29 stsp 	for (;;) {
1066 b50a2b46 2022-12-29 stsp 		const struct got_error *err = NULL;
1067 b50a2b46 2022-12-29 stsp 		struct gotd_client *client = NULL;
1068 b50a2b46 2022-12-29 stsp 		uint32_t client_id = 0;
1069 b50a2b46 2022-12-29 stsp 		int do_disconnect = 0;
1070 b50a2b46 2022-12-29 stsp 
1071 b50a2b46 2022-12-29 stsp 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1072 b50a2b46 2022-12-29 stsp 			fatal("%s: imsg_get error", __func__);
1073 b50a2b46 2022-12-29 stsp 		if (n == 0)	/* No more messages. */
1074 b50a2b46 2022-12-29 stsp 			break;
1075 b50a2b46 2022-12-29 stsp 
1076 b50a2b46 2022-12-29 stsp 		switch (imsg.hdr.type) {
1077 b50a2b46 2022-12-29 stsp 		case GOTD_IMSG_ERROR:
1078 b50a2b46 2022-12-29 stsp 			do_disconnect = 1;
1079 b50a2b46 2022-12-29 stsp 			err = gotd_imsg_recv_error(&client_id, &imsg);
1080 b50a2b46 2022-12-29 stsp 			break;
1081 b50a2b46 2022-12-29 stsp 		case GOTD_IMSG_CONNECT:
1082 b50a2b46 2022-12-29 stsp 			err = recv_connect(&client_id, &imsg);
1083 b50a2b46 2022-12-29 stsp 			break;
1084 b50a2b46 2022-12-29 stsp 		default:
1085 b50a2b46 2022-12-29 stsp 			log_debug("unexpected imsg %d", imsg.hdr.type);
1086 b50a2b46 2022-12-29 stsp 			break;
1087 b50a2b46 2022-12-29 stsp 		}
1088 b50a2b46 2022-12-29 stsp 
1089 b50a2b46 2022-12-29 stsp 		client = find_client(client_id);
1090 b50a2b46 2022-12-29 stsp 		if (client == NULL) {
1091 b50a2b46 2022-12-29 stsp 			log_warnx("%s: client not found", __func__);
1092 b50a2b46 2022-12-29 stsp 			imsg_free(&imsg);
1093 b50a2b46 2022-12-29 stsp 			continue;
1094 b50a2b46 2022-12-29 stsp 		}
1095 b50a2b46 2022-12-29 stsp 
1096 b50a2b46 2022-12-29 stsp 		if (err)
1097 b50a2b46 2022-12-29 stsp 			log_warnx("uid %d: %s", client->euid, err->msg);
1098 b50a2b46 2022-12-29 stsp 
1099 b50a2b46 2022-12-29 stsp 		if (do_disconnect) {
1100 b50a2b46 2022-12-29 stsp 			if (err)
1101 b50a2b46 2022-12-29 stsp 				disconnect_on_error(client, err);
1102 b50a2b46 2022-12-29 stsp 			else
1103 b50a2b46 2022-12-29 stsp 				disconnect(client);
1104 b50a2b46 2022-12-29 stsp 		}
1105 b50a2b46 2022-12-29 stsp 
1106 b50a2b46 2022-12-29 stsp 		imsg_free(&imsg);
1107 b50a2b46 2022-12-29 stsp 	}
1108 b50a2b46 2022-12-29 stsp done:
1109 b50a2b46 2022-12-29 stsp 	if (!shut) {
1110 b50a2b46 2022-12-29 stsp 		gotd_imsg_event_add(iev);
1111 b50a2b46 2022-12-29 stsp 	} else {
1112 b50a2b46 2022-12-29 stsp 		/* This pipe is dead. Remove its event handler */
1113 b50a2b46 2022-12-29 stsp 		event_del(&iev->ev);
1114 b50a2b46 2022-12-29 stsp 		event_loopexit(NULL);
1115 b50a2b46 2022-12-29 stsp 	}
1116 b50a2b46 2022-12-29 stsp }
1117 b50a2b46 2022-12-29 stsp 
1118 b50a2b46 2022-12-29 stsp static void
1119 5e25db14 2022-12-29 stsp gotd_dispatch_auth_child(int fd, short event, void *arg)
1120 5e25db14 2022-12-29 stsp {
1121 5e25db14 2022-12-29 stsp 	const struct got_error *err = NULL;
1122 5e25db14 2022-12-29 stsp 	struct gotd_imsgev *iev = arg;
1123 5e25db14 2022-12-29 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
1124 5e25db14 2022-12-29 stsp 	struct gotd_client *client;
1125 5e25db14 2022-12-29 stsp 	struct gotd_repo *repo = NULL;
1126 5e25db14 2022-12-29 stsp 	ssize_t n;
1127 5e25db14 2022-12-29 stsp 	int shut = 0;
1128 5e25db14 2022-12-29 stsp 	struct imsg imsg;
1129 5e25db14 2022-12-29 stsp 	uint32_t client_id = 0;
1130 5e25db14 2022-12-29 stsp 	int do_disconnect = 0;
1131 56624d2b 2023-12-27 stsp 	size_t datalen;
1132 5e25db14 2022-12-29 stsp 
1133 5e25db14 2022-12-29 stsp 	client = find_client_by_proc_fd(fd);
1134 ae0cca99 2023-02-09 stsp 	if (client == NULL) {
1135 ae0cca99 2023-02-09 stsp 		/* Can happen during process teardown. */
1136 ae0cca99 2023-02-09 stsp 		warnx("cannot find client for fd %d", fd);
1137 ae0cca99 2023-02-09 stsp 		shut = 1;
1138 ae0cca99 2023-02-09 stsp 		goto done;
1139 ae0cca99 2023-02-09 stsp 	}
1140 5e25db14 2022-12-29 stsp 
1141 5e25db14 2022-12-29 stsp 	if (client->auth == NULL)
1142 5e25db14 2022-12-29 stsp 		fatalx("cannot find auth child process for fd %d", fd);
1143 5e25db14 2022-12-29 stsp 
1144 5e25db14 2022-12-29 stsp 	if (event & EV_READ) {
1145 5e25db14 2022-12-29 stsp 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1146 5e25db14 2022-12-29 stsp 			fatal("imsg_read error");
1147 5e25db14 2022-12-29 stsp 		if (n == 0) {
1148 5e25db14 2022-12-29 stsp 			/* Connection closed. */
1149 5e25db14 2022-12-29 stsp 			shut = 1;
1150 5e25db14 2022-12-29 stsp 			goto done;
1151 5e25db14 2022-12-29 stsp 		}
1152 5e25db14 2022-12-29 stsp 	}
1153 5e25db14 2022-12-29 stsp 
1154 5e25db14 2022-12-29 stsp 	if (event & EV_WRITE) {
1155 5e25db14 2022-12-29 stsp 		n = msgbuf_write(&ibuf->w);
1156 5e25db14 2022-12-29 stsp 		if (n == -1 && errno != EAGAIN)
1157 5e25db14 2022-12-29 stsp 			fatal("msgbuf_write");
1158 5e25db14 2022-12-29 stsp 		if (n == 0) {
1159 5e25db14 2022-12-29 stsp 			/* Connection closed. */
1160 5e25db14 2022-12-29 stsp 			shut = 1;
1161 5e25db14 2022-12-29 stsp 		}
1162 5e25db14 2022-12-29 stsp 		goto done;
1163 5e25db14 2022-12-29 stsp 	}
1164 5e25db14 2022-12-29 stsp 
1165 5e25db14 2022-12-29 stsp 	if (client->auth->iev.ibuf.fd != fd)
1166 5e25db14 2022-12-29 stsp 		fatalx("%s: unexpected fd %d", __func__, fd);
1167 5e25db14 2022-12-29 stsp 
1168 5e25db14 2022-12-29 stsp 	if ((n = imsg_get(ibuf, &imsg)) == -1)
1169 5e25db14 2022-12-29 stsp 		fatal("%s: imsg_get error", __func__);
1170 5e25db14 2022-12-29 stsp 	if (n == 0)	/* No more messages. */
1171 5e25db14 2022-12-29 stsp 		return;
1172 5e25db14 2022-12-29 stsp 
1173 5e25db14 2022-12-29 stsp 	evtimer_del(&client->tmo);
1174 5e25db14 2022-12-29 stsp 
1175 56624d2b 2023-12-27 stsp 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1176 56624d2b 2023-12-27 stsp 
1177 5e25db14 2022-12-29 stsp 	switch (imsg.hdr.type) {
1178 5e25db14 2022-12-29 stsp 	case GOTD_IMSG_ERROR:
1179 5e25db14 2022-12-29 stsp 		do_disconnect = 1;
1180 5e25db14 2022-12-29 stsp 		err = gotd_imsg_recv_error(&client_id, &imsg);
1181 5e25db14 2022-12-29 stsp 		break;
1182 5e25db14 2022-12-29 stsp 	case GOTD_IMSG_ACCESS_GRANTED:
1183 56624d2b 2023-12-27 stsp 		if (client->state != GOTD_CLIENT_STATE_NEW) {
1184 56624d2b 2023-12-27 stsp 			do_disconnect = 1;
1185 56624d2b 2023-12-27 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1186 56624d2b 2023-12-27 stsp 		}
1187 5e25db14 2022-12-29 stsp 		break;
1188 5e25db14 2022-12-29 stsp 	default:
1189 5e25db14 2022-12-29 stsp 		do_disconnect = 1;
1190 5e25db14 2022-12-29 stsp 		log_debug("unexpected imsg %d", imsg.hdr.type);
1191 5e25db14 2022-12-29 stsp 		break;
1192 5e25db14 2022-12-29 stsp 	}
1193 5e25db14 2022-12-29 stsp 
1194 5e25db14 2022-12-29 stsp 	if (!verify_imsg_src(client, client->auth, &imsg)) {
1195 5e25db14 2022-12-29 stsp 		do_disconnect = 1;
1196 5e25db14 2022-12-29 stsp 		log_debug("dropping imsg type %d from PID %d",
1197 5e25db14 2022-12-29 stsp 		    imsg.hdr.type, client->auth->pid);
1198 5e25db14 2022-12-29 stsp 	}
1199 5e25db14 2022-12-29 stsp 
1200 5e25db14 2022-12-29 stsp 	if (do_disconnect) {
1201 5e25db14 2022-12-29 stsp 		if (err)
1202 5e25db14 2022-12-29 stsp 			disconnect_on_error(client, err);
1203 5e25db14 2022-12-29 stsp 		else
1204 5e25db14 2022-12-29 stsp 			disconnect(client);
1205 56624d2b 2023-12-27 stsp 		imsg_free(&imsg);
1206 c000aa35 2023-05-01 mark 		return;
1207 56624d2b 2023-12-27 stsp 	}
1208 56624d2b 2023-12-27 stsp 
1209 56624d2b 2023-12-27 stsp 	client->state = GOTD_CLIENT_STATE_ACCESS_GRANTED;
1210 56624d2b 2023-12-27 stsp 	if (datalen > 0)
1211 56624d2b 2023-12-27 stsp 		client->username = strndup(imsg.data, datalen);
1212 56624d2b 2023-12-27 stsp 	imsg_free(&imsg);
1213 56624d2b 2023-12-27 stsp 	if (client->username == NULL &&
1214 56624d2b 2023-12-27 stsp 	    asprintf(&client->username, "uid %d", client->euid) == -1) {
1215 56624d2b 2023-12-27 stsp 		err = got_error_from_errno("asprintf");
1216 56624d2b 2023-12-27 stsp 		goto done;
1217 5e25db14 2022-12-29 stsp 	}
1218 5e25db14 2022-12-29 stsp 
1219 b09c1279 2023-03-28 stsp 	repo = gotd_find_repo_by_name(client->auth->repo_name, &gotd);
1220 5e25db14 2022-12-29 stsp 	if (repo == NULL) {
1221 5e25db14 2022-12-29 stsp 		err = got_error(GOT_ERR_NOT_GIT_REPO);
1222 5e25db14 2022-12-29 stsp 		goto done;
1223 5e25db14 2022-12-29 stsp 	}
1224 5e25db14 2022-12-29 stsp 	kill_auth_proc(client);
1225 5e25db14 2022-12-29 stsp 
1226 56624d2b 2023-12-27 stsp 	log_info("authenticated %s for repository %s",
1227 56624d2b 2023-12-27 stsp 	    client->username, repo->name);
1228 5e25db14 2022-12-29 stsp 
1229 ae7c1b78 2023-01-10 stsp 	err = start_session_child(client, repo, gotd.argv0,
1230 7fdc3e58 2022-12-30 mark 	    gotd.confpath, gotd.daemonize, gotd.verbosity);
1231 ae7c1b78 2023-01-10 stsp 	if (err)
1232 ae7c1b78 2023-01-10 stsp 		goto done;
1233 5e25db14 2022-12-29 stsp done:
1234 5e25db14 2022-12-29 stsp 	if (err)
1235 5e25db14 2022-12-29 stsp 		log_warnx("uid %d: %s", client->euid, err->msg);
1236 5e25db14 2022-12-29 stsp 
1237 5e25db14 2022-12-29 stsp 	/* We might have killed the auth process by now. */
1238 5e25db14 2022-12-29 stsp 	if (client->auth != NULL) {
1239 5e25db14 2022-12-29 stsp 		if (!shut) {
1240 5e25db14 2022-12-29 stsp 			gotd_imsg_event_add(iev);
1241 5e25db14 2022-12-29 stsp 		} else {
1242 5e25db14 2022-12-29 stsp 			/* This pipe is dead. Remove its event handler */
1243 5e25db14 2022-12-29 stsp 			event_del(&iev->ev);
1244 5e25db14 2022-12-29 stsp 		}
1245 5e25db14 2022-12-29 stsp 	}
1246 5e25db14 2022-12-29 stsp }
1247 5e25db14 2022-12-29 stsp 
1248 ae7c1b78 2023-01-10 stsp static const struct got_error *
1249 ae7c1b78 2023-01-10 stsp connect_session(struct gotd_client *client)
1250 ae7c1b78 2023-01-10 stsp {
1251 ae7c1b78 2023-01-10 stsp 	const struct got_error *err = NULL;
1252 ae7c1b78 2023-01-10 stsp 	struct gotd_imsg_connect iconnect;
1253 ae7c1b78 2023-01-10 stsp 	int s;
1254 ae7c1b78 2023-01-10 stsp 
1255 ae7c1b78 2023-01-10 stsp 	memset(&iconnect, 0, sizeof(iconnect));
1256 ae7c1b78 2023-01-10 stsp 
1257 ae7c1b78 2023-01-10 stsp 	s = dup(client->fd);
1258 ae7c1b78 2023-01-10 stsp 	if (s == -1)
1259 ae7c1b78 2023-01-10 stsp 		return got_error_from_errno("dup");
1260 ae7c1b78 2023-01-10 stsp 
1261 ae7c1b78 2023-01-10 stsp 	iconnect.client_id = client->id;
1262 ae7c1b78 2023-01-10 stsp 	iconnect.euid = client->euid;
1263 ae7c1b78 2023-01-10 stsp 	iconnect.egid = client->egid;
1264 ae7c1b78 2023-01-10 stsp 
1265 ae7c1b78 2023-01-10 stsp 	if (gotd_imsg_compose_event(&client->session->iev, GOTD_IMSG_CONNECT,
1266 ae7c1b78 2023-01-10 stsp 	    PROC_GOTD, s, &iconnect, sizeof(iconnect)) == -1) {
1267 ae7c1b78 2023-01-10 stsp 		err = got_error_from_errno("imsg compose CONNECT");
1268 ae7c1b78 2023-01-10 stsp 		close(s);
1269 ae7c1b78 2023-01-10 stsp 		return err;
1270 ae7c1b78 2023-01-10 stsp 	}
1271 ae7c1b78 2023-01-10 stsp 
1272 ae7c1b78 2023-01-10 stsp 	/*
1273 ae7c1b78 2023-01-10 stsp 	 * We are no longer interested in messages from this client.
1274 ae7c1b78 2023-01-10 stsp 	 * Further client requests will be handled by the session process.
1275 ae7c1b78 2023-01-10 stsp 	 */
1276 ae7c1b78 2023-01-10 stsp 	msgbuf_clear(&client->iev.ibuf.w);
1277 ae7c1b78 2023-01-10 stsp 	imsg_clear(&client->iev.ibuf);
1278 ae7c1b78 2023-01-10 stsp 	event_del(&client->iev.ev);
1279 ae7c1b78 2023-01-10 stsp 	client->fd = -1; /* will be closed via copy in client->iev.ibuf.fd */
1280 ae7c1b78 2023-01-10 stsp 
1281 ae7c1b78 2023-01-10 stsp 	return NULL;
1282 ae7c1b78 2023-01-10 stsp }
1283 ae7c1b78 2023-01-10 stsp 
1284 5e25db14 2022-12-29 stsp static void
1285 ae7c1b78 2023-01-10 stsp gotd_dispatch_client_session(int fd, short event, void *arg)
1286 b50a2b46 2022-12-29 stsp {
1287 b50a2b46 2022-12-29 stsp 	struct gotd_imsgev *iev = arg;
1288 b50a2b46 2022-12-29 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
1289 13b2bc37 2022-10-23 stsp 	struct gotd_child_proc *proc = NULL;
1290 b50a2b46 2022-12-29 stsp 	struct gotd_client *client = NULL;
1291 13b2bc37 2022-10-23 stsp 	ssize_t n;
1292 13b2bc37 2022-10-23 stsp 	int shut = 0;
1293 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
1294 13b2bc37 2022-10-23 stsp 
1295 ae7c1b78 2023-01-10 stsp 	client = find_client_by_proc_fd(fd);
1296 ae0cca99 2023-02-09 stsp 	if (client == NULL) {
1297 ae0cca99 2023-02-09 stsp 		/* Can happen during process teardown. */
1298 ae0cca99 2023-02-09 stsp 		warnx("cannot find client for fd %d", fd);
1299 ae0cca99 2023-02-09 stsp 		shut = 1;
1300 ae0cca99 2023-02-09 stsp 		goto done;
1301 ae0cca99 2023-02-09 stsp 	}
1302 ae7c1b78 2023-01-10 stsp 
1303 13b2bc37 2022-10-23 stsp 	if (event & EV_READ) {
1304 13b2bc37 2022-10-23 stsp 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1305 13b2bc37 2022-10-23 stsp 			fatal("imsg_read error");
1306 13b2bc37 2022-10-23 stsp 		if (n == 0) {
1307 13b2bc37 2022-10-23 stsp 			/* Connection closed. */
1308 13b2bc37 2022-10-23 stsp 			shut = 1;
1309 13b2bc37 2022-10-23 stsp 			goto done;
1310 13b2bc37 2022-10-23 stsp 		}
1311 13b2bc37 2022-10-23 stsp 	}
1312 13b2bc37 2022-10-23 stsp 
1313 13b2bc37 2022-10-23 stsp 	if (event & EV_WRITE) {
1314 13b2bc37 2022-10-23 stsp 		n = msgbuf_write(&ibuf->w);
1315 13b2bc37 2022-10-23 stsp 		if (n == -1 && errno != EAGAIN)
1316 13b2bc37 2022-10-23 stsp 			fatal("msgbuf_write");
1317 13b2bc37 2022-10-23 stsp 		if (n == 0) {
1318 13b2bc37 2022-10-23 stsp 			/* Connection closed. */
1319 13b2bc37 2022-10-23 stsp 			shut = 1;
1320 13b2bc37 2022-10-23 stsp 			goto done;
1321 ae7c1b78 2023-01-10 stsp 		}
1322 ae7c1b78 2023-01-10 stsp 	}
1323 ae7c1b78 2023-01-10 stsp 
1324 ae7c1b78 2023-01-10 stsp 	proc = client->session;
1325 ae7c1b78 2023-01-10 stsp 	if (proc == NULL)
1326 ae7c1b78 2023-01-10 stsp 		fatalx("cannot find session child process for fd %d", fd);
1327 ae7c1b78 2023-01-10 stsp 
1328 ae7c1b78 2023-01-10 stsp 	for (;;) {
1329 ae7c1b78 2023-01-10 stsp 		const struct got_error *err = NULL;
1330 ae7c1b78 2023-01-10 stsp 		uint32_t client_id = 0;
1331 ae7c1b78 2023-01-10 stsp 		int do_disconnect = 0, do_start_repo_child = 0;
1332 ae7c1b78 2023-01-10 stsp 
1333 ae7c1b78 2023-01-10 stsp 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1334 ae7c1b78 2023-01-10 stsp 			fatal("%s: imsg_get error", __func__);
1335 ae7c1b78 2023-01-10 stsp 		if (n == 0)	/* No more messages. */
1336 ae7c1b78 2023-01-10 stsp 			break;
1337 ae7c1b78 2023-01-10 stsp 
1338 ae7c1b78 2023-01-10 stsp 		switch (imsg.hdr.type) {
1339 ae7c1b78 2023-01-10 stsp 		case GOTD_IMSG_ERROR:
1340 ae7c1b78 2023-01-10 stsp 			do_disconnect = 1;
1341 ae7c1b78 2023-01-10 stsp 			err = gotd_imsg_recv_error(&client_id, &imsg);
1342 ae7c1b78 2023-01-10 stsp 			break;
1343 ae7c1b78 2023-01-10 stsp 		case GOTD_IMSG_CLIENT_SESSION_READY:
1344 eac23c30 2023-01-10 stsp 			if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED) {
1345 ae7c1b78 2023-01-10 stsp 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1346 ae7c1b78 2023-01-10 stsp 				break;
1347 ae7c1b78 2023-01-10 stsp 			}
1348 ae7c1b78 2023-01-10 stsp 			do_start_repo_child = 1;
1349 ae7c1b78 2023-01-10 stsp 			break;
1350 ae7c1b78 2023-01-10 stsp 		case GOTD_IMSG_DISCONNECT:
1351 ae7c1b78 2023-01-10 stsp 			do_disconnect = 1;
1352 ae7c1b78 2023-01-10 stsp 			break;
1353 ae7c1b78 2023-01-10 stsp 		default:
1354 ae7c1b78 2023-01-10 stsp 			log_debug("unexpected imsg %d", imsg.hdr.type);
1355 ae7c1b78 2023-01-10 stsp 			break;
1356 13b2bc37 2022-10-23 stsp 		}
1357 ae7c1b78 2023-01-10 stsp 
1358 ae7c1b78 2023-01-10 stsp 		if (!verify_imsg_src(client, proc, &imsg)) {
1359 ae7c1b78 2023-01-10 stsp 			log_debug("dropping imsg type %d from PID %d",
1360 ae7c1b78 2023-01-10 stsp 			    imsg.hdr.type, proc->pid);
1361 ae7c1b78 2023-01-10 stsp 			imsg_free(&imsg);
1362 ae7c1b78 2023-01-10 stsp 			continue;
1363 ae7c1b78 2023-01-10 stsp 		}
1364 ae7c1b78 2023-01-10 stsp 		if (err)
1365 ae7c1b78 2023-01-10 stsp 			log_warnx("uid %d: %s", client->euid, err->msg);
1366 ae7c1b78 2023-01-10 stsp 
1367 ae7c1b78 2023-01-10 stsp 		if (do_start_repo_child) {
1368 ae7c1b78 2023-01-10 stsp 			struct gotd_repo *repo;
1369 b09c1279 2023-03-28 stsp 			const char *name = client->session->repo_name;
1370 ae7c1b78 2023-01-10 stsp 
1371 b09c1279 2023-03-28 stsp 			repo = gotd_find_repo_by_name(name, &gotd);
1372 ae7c1b78 2023-01-10 stsp 			if (repo != NULL) {
1373 ae7c1b78 2023-01-10 stsp 				enum gotd_procid proc_type;
1374 ae7c1b78 2023-01-10 stsp 
1375 ae7c1b78 2023-01-10 stsp 				if (client->required_auth & GOTD_AUTH_WRITE)
1376 ae7c1b78 2023-01-10 stsp 					proc_type = PROC_REPO_WRITE;
1377 ae7c1b78 2023-01-10 stsp 				else
1378 ae7c1b78 2023-01-10 stsp 					proc_type = PROC_REPO_READ;
1379 ae7c1b78 2023-01-10 stsp 
1380 ae7c1b78 2023-01-10 stsp 				err = start_repo_child(client, proc_type, repo,
1381 ae7c1b78 2023-01-10 stsp 				    gotd.argv0, gotd.confpath, gotd.daemonize,
1382 ae7c1b78 2023-01-10 stsp 				    gotd.verbosity);
1383 ae7c1b78 2023-01-10 stsp 			} else
1384 ae7c1b78 2023-01-10 stsp 				err = got_error(GOT_ERR_NOT_GIT_REPO);
1385 ae7c1b78 2023-01-10 stsp 
1386 ae7c1b78 2023-01-10 stsp 			if (err) {
1387 ae7c1b78 2023-01-10 stsp 				log_warnx("uid %d: %s", client->euid, err->msg);
1388 ae7c1b78 2023-01-10 stsp 				do_disconnect = 1;
1389 ae7c1b78 2023-01-10 stsp 			}
1390 ae7c1b78 2023-01-10 stsp 		}
1391 ae7c1b78 2023-01-10 stsp 
1392 ae7c1b78 2023-01-10 stsp 		if (do_disconnect) {
1393 ae7c1b78 2023-01-10 stsp 			if (err)
1394 ae7c1b78 2023-01-10 stsp 				disconnect_on_error(client, err);
1395 ae7c1b78 2023-01-10 stsp 			else
1396 ae7c1b78 2023-01-10 stsp 				disconnect(client);
1397 ae7c1b78 2023-01-10 stsp 		}
1398 ae7c1b78 2023-01-10 stsp 
1399 ae7c1b78 2023-01-10 stsp 		imsg_free(&imsg);
1400 13b2bc37 2022-10-23 stsp 	}
1401 ae7c1b78 2023-01-10 stsp done:
1402 ae7c1b78 2023-01-10 stsp 	if (!shut) {
1403 ae7c1b78 2023-01-10 stsp 		gotd_imsg_event_add(iev);
1404 ae7c1b78 2023-01-10 stsp 	} else {
1405 ae7c1b78 2023-01-10 stsp 		/* This pipe is dead. Remove its event handler */
1406 ae7c1b78 2023-01-10 stsp 		event_del(&iev->ev);
1407 ae7c1b78 2023-01-10 stsp 		disconnect(client);
1408 ae7c1b78 2023-01-10 stsp 	}
1409 ae7c1b78 2023-01-10 stsp }
1410 13b2bc37 2022-10-23 stsp 
1411 ae7c1b78 2023-01-10 stsp static void
1412 ae7c1b78 2023-01-10 stsp gotd_dispatch_repo_child(int fd, short event, void *arg)
1413 ae7c1b78 2023-01-10 stsp {
1414 ae7c1b78 2023-01-10 stsp 	struct gotd_imsgev *iev = arg;
1415 ae7c1b78 2023-01-10 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
1416 ae7c1b78 2023-01-10 stsp 	struct gotd_child_proc *proc = NULL;
1417 ae7c1b78 2023-01-10 stsp 	struct gotd_client *client;
1418 ae7c1b78 2023-01-10 stsp 	ssize_t n;
1419 ae7c1b78 2023-01-10 stsp 	int shut = 0;
1420 ae7c1b78 2023-01-10 stsp 	struct imsg imsg;
1421 ae7c1b78 2023-01-10 stsp 
1422 b50a2b46 2022-12-29 stsp 	client = find_client_by_proc_fd(fd);
1423 ae0cca99 2023-02-09 stsp 	if (client == NULL) {
1424 ae0cca99 2023-02-09 stsp 		/* Can happen during process teardown. */
1425 ae0cca99 2023-02-09 stsp 		warnx("cannot find client for fd %d", fd);
1426 ae0cca99 2023-02-09 stsp 		shut = 1;
1427 ae0cca99 2023-02-09 stsp 		goto done;
1428 ae0cca99 2023-02-09 stsp 	}
1429 b50a2b46 2022-12-29 stsp 
1430 ae7c1b78 2023-01-10 stsp 	if (event & EV_READ) {
1431 ae7c1b78 2023-01-10 stsp 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1432 ae7c1b78 2023-01-10 stsp 			fatal("imsg_read error");
1433 ae7c1b78 2023-01-10 stsp 		if (n == 0) {
1434 ae7c1b78 2023-01-10 stsp 			/* Connection closed. */
1435 ae7c1b78 2023-01-10 stsp 			shut = 1;
1436 ae7c1b78 2023-01-10 stsp 			goto done;
1437 ae7c1b78 2023-01-10 stsp 		}
1438 ae7c1b78 2023-01-10 stsp 	}
1439 ae7c1b78 2023-01-10 stsp 
1440 ae7c1b78 2023-01-10 stsp 	if (event & EV_WRITE) {
1441 ae7c1b78 2023-01-10 stsp 		n = msgbuf_write(&ibuf->w);
1442 ae7c1b78 2023-01-10 stsp 		if (n == -1 && errno != EAGAIN)
1443 ae7c1b78 2023-01-10 stsp 			fatal("msgbuf_write");
1444 ae7c1b78 2023-01-10 stsp 		if (n == 0) {
1445 ae7c1b78 2023-01-10 stsp 			/* Connection closed. */
1446 ae7c1b78 2023-01-10 stsp 			shut = 1;
1447 ae7c1b78 2023-01-10 stsp 			goto done;
1448 ae7c1b78 2023-01-10 stsp 		}
1449 ae7c1b78 2023-01-10 stsp 	}
1450 ae7c1b78 2023-01-10 stsp 
1451 f7a854cf 2023-01-10 stsp 	proc = client->repo;
1452 13b2bc37 2022-10-23 stsp 	if (proc == NULL)
1453 13b2bc37 2022-10-23 stsp 		fatalx("cannot find child process for fd %d", fd);
1454 13b2bc37 2022-10-23 stsp 
1455 13b2bc37 2022-10-23 stsp 	for (;;) {
1456 13b2bc37 2022-10-23 stsp 		const struct got_error *err = NULL;
1457 13b2bc37 2022-10-23 stsp 		uint32_t client_id = 0;
1458 13b2bc37 2022-10-23 stsp 		int do_disconnect = 0;
1459 13b2bc37 2022-10-23 stsp 
1460 13b2bc37 2022-10-23 stsp 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1461 13b2bc37 2022-10-23 stsp 			fatal("%s: imsg_get error", __func__);
1462 13b2bc37 2022-10-23 stsp 		if (n == 0)	/* No more messages. */
1463 13b2bc37 2022-10-23 stsp 			break;
1464 13b2bc37 2022-10-23 stsp 
1465 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
1466 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
1467 13b2bc37 2022-10-23 stsp 			do_disconnect = 1;
1468 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(&client_id, &imsg);
1469 13b2bc37 2022-10-23 stsp 			break;
1470 b50a2b46 2022-12-29 stsp 		case GOTD_IMSG_REPO_CHILD_READY:
1471 ae7c1b78 2023-01-10 stsp 			err = connect_session(client);
1472 ae7c1b78 2023-01-10 stsp 			if (err)
1473 ae7c1b78 2023-01-10 stsp 				break;
1474 ae7c1b78 2023-01-10 stsp 			err = connect_repo_child(client, proc);
1475 d93ecf7d 2022-12-14 stsp 			break;
1476 13b2bc37 2022-10-23 stsp 		default:
1477 13b2bc37 2022-10-23 stsp 			log_debug("unexpected imsg %d", imsg.hdr.type);
1478 13b2bc37 2022-10-23 stsp 			break;
1479 13b2bc37 2022-10-23 stsp 		}
1480 13b2bc37 2022-10-23 stsp 
1481 13b2bc37 2022-10-23 stsp 		if (!verify_imsg_src(client, proc, &imsg)) {
1482 13b2bc37 2022-10-23 stsp 			log_debug("dropping imsg type %d from PID %d",
1483 13b2bc37 2022-10-23 stsp 			    imsg.hdr.type, proc->pid);
1484 13b2bc37 2022-10-23 stsp 			imsg_free(&imsg);
1485 13b2bc37 2022-10-23 stsp 			continue;
1486 13b2bc37 2022-10-23 stsp 		}
1487 13b2bc37 2022-10-23 stsp 		if (err)
1488 13b2bc37 2022-10-23 stsp 			log_warnx("uid %d: %s", client->euid, err->msg);
1489 13b2bc37 2022-10-23 stsp 
1490 13b2bc37 2022-10-23 stsp 		if (do_disconnect) {
1491 13b2bc37 2022-10-23 stsp 			if (err)
1492 13b2bc37 2022-10-23 stsp 				disconnect_on_error(client, err);
1493 13b2bc37 2022-10-23 stsp 			else
1494 13b2bc37 2022-10-23 stsp 				disconnect(client);
1495 36c7cfbb 2022-11-04 stsp 		}
1496 ae7c1b78 2023-01-10 stsp 
1497 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
1498 13b2bc37 2022-10-23 stsp 	}
1499 13b2bc37 2022-10-23 stsp done:
1500 13b2bc37 2022-10-23 stsp 	if (!shut) {
1501 13b2bc37 2022-10-23 stsp 		gotd_imsg_event_add(iev);
1502 13b2bc37 2022-10-23 stsp 	} else {
1503 13b2bc37 2022-10-23 stsp 		/* This pipe is dead. Remove its event handler */
1504 13b2bc37 2022-10-23 stsp 		event_del(&iev->ev);
1505 ae7c1b78 2023-01-10 stsp 		disconnect(client);
1506 13b2bc37 2022-10-23 stsp 	}
1507 13b2bc37 2022-10-23 stsp }
1508 13b2bc37 2022-10-23 stsp 
1509 13b2bc37 2022-10-23 stsp static pid_t
1510 eec68231 2022-12-14 stsp start_child(enum gotd_procid proc_id, const char *repo_path,
1511 585362fd 2022-10-31 op     char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
1512 13b2bc37 2022-10-23 stsp {
1513 585362fd 2022-10-31 op 	char	*argv[11];
1514 13b2bc37 2022-10-23 stsp 	int	 argc = 0;
1515 13b2bc37 2022-10-23 stsp 	pid_t	 pid;
1516 13b2bc37 2022-10-23 stsp 
1517 13b2bc37 2022-10-23 stsp 	switch (pid = fork()) {
1518 13b2bc37 2022-10-23 stsp 	case -1:
1519 13b2bc37 2022-10-23 stsp 		fatal("cannot fork");
1520 13b2bc37 2022-10-23 stsp 	case 0:
1521 13b2bc37 2022-10-23 stsp 		break;
1522 13b2bc37 2022-10-23 stsp 	default:
1523 13b2bc37 2022-10-23 stsp 		close(fd);
1524 13b2bc37 2022-10-23 stsp 		return pid;
1525 13b2bc37 2022-10-23 stsp 	}
1526 13b2bc37 2022-10-23 stsp 
1527 8c6fc146 2022-11-17 stsp 	if (fd != GOTD_FILENO_MSG_PIPE) {
1528 8c6fc146 2022-11-17 stsp 		if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
1529 13b2bc37 2022-10-23 stsp 			fatal("cannot setup imsg fd");
1530 13b2bc37 2022-10-23 stsp 	} else if (fcntl(fd, F_SETFD, 0) == -1)
1531 13b2bc37 2022-10-23 stsp 		fatal("cannot setup imsg fd");
1532 13b2bc37 2022-10-23 stsp 
1533 13b2bc37 2022-10-23 stsp 	argv[argc++] = argv0;
1534 13b2bc37 2022-10-23 stsp 	switch (proc_id) {
1535 d93ecf7d 2022-12-14 stsp 	case PROC_LISTEN:
1536 d93ecf7d 2022-12-14 stsp 		argv[argc++] = (char *)"-L";
1537 d93ecf7d 2022-12-14 stsp 		break;
1538 5e25db14 2022-12-29 stsp 	case PROC_AUTH:
1539 5e25db14 2022-12-29 stsp 		argv[argc++] = (char *)"-A";
1540 5e25db14 2022-12-29 stsp 		break;
1541 b0614828 2023-06-19 stsp 	case PROC_SESSION_READ:
1542 b0614828 2023-06-19 stsp 		argv[argc++] = (char *)"-s";
1543 b0614828 2023-06-19 stsp 		break;
1544 b0614828 2023-06-19 stsp 	case PROC_SESSION_WRITE:
1545 ae7c1b78 2023-01-10 stsp 		argv[argc++] = (char *)"-S";
1546 ae7c1b78 2023-01-10 stsp 		break;
1547 13b2bc37 2022-10-23 stsp 	case PROC_REPO_READ:
1548 13b2bc37 2022-10-23 stsp 		argv[argc++] = (char *)"-R";
1549 13b2bc37 2022-10-23 stsp 		break;
1550 13b2bc37 2022-10-23 stsp 	case PROC_REPO_WRITE:
1551 13b2bc37 2022-10-23 stsp 		argv[argc++] = (char *)"-W";
1552 13b2bc37 2022-10-23 stsp 		break;
1553 13b2bc37 2022-10-23 stsp 	default:
1554 13b2bc37 2022-10-23 stsp 		fatalx("invalid process id %d", proc_id);
1555 13b2bc37 2022-10-23 stsp 	}
1556 13b2bc37 2022-10-23 stsp 
1557 585362fd 2022-10-31 op 	argv[argc++] = (char *)"-f";
1558 585362fd 2022-10-31 op 	argv[argc++] = (char *)confpath;
1559 585362fd 2022-10-31 op 
1560 eec68231 2022-12-14 stsp 	if (repo_path) {
1561 d93ecf7d 2022-12-14 stsp 		argv[argc++] = (char *)"-P";
1562 eec68231 2022-12-14 stsp 		argv[argc++] = (char *)repo_path;
1563 d93ecf7d 2022-12-14 stsp 	}
1564 13b2bc37 2022-10-23 stsp 
1565 13b2bc37 2022-10-23 stsp 	if (!daemonize)
1566 13b2bc37 2022-10-23 stsp 		argv[argc++] = (char *)"-d";
1567 13b2bc37 2022-10-23 stsp 	if (verbosity > 0)
1568 13b2bc37 2022-10-23 stsp 		argv[argc++] = (char *)"-v";
1569 13b2bc37 2022-10-23 stsp 	if (verbosity > 1)
1570 13b2bc37 2022-10-23 stsp 		argv[argc++] = (char *)"-v";
1571 13b2bc37 2022-10-23 stsp 	argv[argc++] = NULL;
1572 13b2bc37 2022-10-23 stsp 
1573 13b2bc37 2022-10-23 stsp 	execvp(argv0, argv);
1574 13b2bc37 2022-10-23 stsp 	fatal("execvp");
1575 13b2bc37 2022-10-23 stsp }
1576 13b2bc37 2022-10-23 stsp 
1577 13b2bc37 2022-10-23 stsp static void
1578 d93ecf7d 2022-12-14 stsp start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
1579 d93ecf7d 2022-12-14 stsp {
1580 c929736a 2023-06-22 op 	struct gotd_child_proc *proc;
1581 d93ecf7d 2022-12-14 stsp 
1582 c929736a 2023-06-22 op 	proc = calloc(1, sizeof(*proc));
1583 c929736a 2023-06-22 op 	if (proc == NULL)
1584 c929736a 2023-06-22 op 		fatal("calloc");
1585 c929736a 2023-06-22 op 
1586 839338f6 2023-06-22 op 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1587 839338f6 2023-06-22 op 
1588 839338f6 2023-06-22 op 	/* proc->tmo is initialized in main() after event_init() */
1589 839338f6 2023-06-22 op 
1590 d93ecf7d 2022-12-14 stsp 	proc->type = PROC_LISTEN;
1591 d93ecf7d 2022-12-14 stsp 
1592 d93ecf7d 2022-12-14 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1593 d93ecf7d 2022-12-14 stsp 	    PF_UNSPEC, proc->pipe) == -1)
1594 d93ecf7d 2022-12-14 stsp 		fatal("socketpair");
1595 d93ecf7d 2022-12-14 stsp 
1596 d93ecf7d 2022-12-14 stsp 	proc->pid = start_child(proc->type, NULL, argv0, confpath,
1597 d93ecf7d 2022-12-14 stsp 	    proc->pipe[1], daemonize, verbosity);
1598 d93ecf7d 2022-12-14 stsp 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1599 b50a2b46 2022-12-29 stsp 	proc->iev.handler = gotd_dispatch_listener;
1600 d93ecf7d 2022-12-14 stsp 	proc->iev.events = EV_READ;
1601 d93ecf7d 2022-12-14 stsp 	proc->iev.handler_arg = NULL;
1602 c929736a 2023-06-22 op 
1603 c929736a 2023-06-22 op 	gotd.listen_proc = proc;
1604 d93ecf7d 2022-12-14 stsp }
1605 d93ecf7d 2022-12-14 stsp 
1606 b50a2b46 2022-12-29 stsp static const struct got_error *
1607 ae7c1b78 2023-01-10 stsp start_session_child(struct gotd_client *client, struct gotd_repo *repo,
1608 ae7c1b78 2023-01-10 stsp     char *argv0, const char *confpath, int daemonize, int verbosity)
1609 ae7c1b78 2023-01-10 stsp {
1610 ae7c1b78 2023-01-10 stsp 	struct gotd_child_proc *proc;
1611 ae7c1b78 2023-01-10 stsp 
1612 ae7c1b78 2023-01-10 stsp 	proc = calloc(1, sizeof(*proc));
1613 ae7c1b78 2023-01-10 stsp 	if (proc == NULL)
1614 ae7c1b78 2023-01-10 stsp 		return got_error_from_errno("calloc");
1615 ae7c1b78 2023-01-10 stsp 
1616 839338f6 2023-06-22 op 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1617 839338f6 2023-06-22 op 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1618 839338f6 2023-06-22 op 
1619 b0614828 2023-06-19 stsp 	if (client_is_reading(client))
1620 b0614828 2023-06-19 stsp 		proc->type = PROC_SESSION_READ;
1621 b0614828 2023-06-19 stsp 	else
1622 b0614828 2023-06-19 stsp 		proc->type = PROC_SESSION_WRITE;
1623 ae7c1b78 2023-01-10 stsp 	if (strlcpy(proc->repo_name, repo->name,
1624 ae7c1b78 2023-01-10 stsp 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1625 ae7c1b78 2023-01-10 stsp 		fatalx("repository name too long: %s", repo->name);
1626 ae7c1b78 2023-01-10 stsp 	log_debug("starting client uid %d session for repository %s",
1627 ae7c1b78 2023-01-10 stsp 	    client->euid, repo->name);
1628 ae7c1b78 2023-01-10 stsp 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1629 ae7c1b78 2023-01-10 stsp 	    sizeof(proc->repo_path))
1630 ae7c1b78 2023-01-10 stsp 		fatalx("repository path too long: %s", repo->path);
1631 ae7c1b78 2023-01-10 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1632 ae7c1b78 2023-01-10 stsp 	    PF_UNSPEC, proc->pipe) == -1)
1633 ae7c1b78 2023-01-10 stsp 		fatal("socketpair");
1634 ae7c1b78 2023-01-10 stsp 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1635 ae7c1b78 2023-01-10 stsp 	    confpath, proc->pipe[1], daemonize, verbosity);
1636 ae7c1b78 2023-01-10 stsp 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1637 ae7c1b78 2023-01-10 stsp 	log_debug("proc %s %s is on fd %d",
1638 ae7c1b78 2023-01-10 stsp 	    gotd_proc_names[proc->type], proc->repo_path,
1639 ae7c1b78 2023-01-10 stsp 	    proc->pipe[0]);
1640 ae7c1b78 2023-01-10 stsp 	proc->iev.handler = gotd_dispatch_client_session;
1641 ae7c1b78 2023-01-10 stsp 	proc->iev.events = EV_READ;
1642 ae7c1b78 2023-01-10 stsp 	proc->iev.handler_arg = NULL;
1643 ae7c1b78 2023-01-10 stsp 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1644 ae7c1b78 2023-01-10 stsp 	    gotd_dispatch_client_session, &proc->iev);
1645 ae7c1b78 2023-01-10 stsp 	gotd_imsg_event_add(&proc->iev);
1646 ae7c1b78 2023-01-10 stsp 
1647 ae7c1b78 2023-01-10 stsp 	client->session = proc;
1648 ae7c1b78 2023-01-10 stsp 	return NULL;
1649 ae7c1b78 2023-01-10 stsp }
1650 ae7c1b78 2023-01-10 stsp 
1651 ae7c1b78 2023-01-10 stsp static const struct got_error *
1652 b50a2b46 2022-12-29 stsp start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
1653 b50a2b46 2022-12-29 stsp     struct gotd_repo *repo, char *argv0, const char *confpath,
1654 585362fd 2022-10-31 op     int daemonize, int verbosity)
1655 13b2bc37 2022-10-23 stsp {
1656 13b2bc37 2022-10-23 stsp 	struct gotd_child_proc *proc;
1657 13b2bc37 2022-10-23 stsp 
1658 b50a2b46 2022-12-29 stsp 	if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
1659 b50a2b46 2022-12-29 stsp 		return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
1660 7fdc3e58 2022-12-30 mark 
1661 b50a2b46 2022-12-29 stsp 	proc = calloc(1, sizeof(*proc));
1662 b50a2b46 2022-12-29 stsp 	if (proc == NULL)
1663 b50a2b46 2022-12-29 stsp 		return got_error_from_errno("calloc");
1664 13b2bc37 2022-10-23 stsp 
1665 839338f6 2023-06-22 op 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1666 839338f6 2023-06-22 op 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1667 839338f6 2023-06-22 op 
1668 b50a2b46 2022-12-29 stsp 	proc->type = proc_type;
1669 b50a2b46 2022-12-29 stsp 	if (strlcpy(proc->repo_name, repo->name,
1670 b50a2b46 2022-12-29 stsp 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1671 b50a2b46 2022-12-29 stsp 		fatalx("repository name too long: %s", repo->name);
1672 b50a2b46 2022-12-29 stsp 	log_debug("starting %s for repository %s",
1673 b50a2b46 2022-12-29 stsp 	    proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
1674 9b7f22a6 2023-01-08 stsp 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1675 9b7f22a6 2023-01-08 stsp 	    sizeof(proc->repo_path))
1676 9b7f22a6 2023-01-08 stsp 		fatalx("repository path too long: %s", repo->path);
1677 b50a2b46 2022-12-29 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1678 b50a2b46 2022-12-29 stsp 	    PF_UNSPEC, proc->pipe) == -1)
1679 b50a2b46 2022-12-29 stsp 		fatal("socketpair");
1680 b50a2b46 2022-12-29 stsp 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1681 b50a2b46 2022-12-29 stsp 	    confpath, proc->pipe[1], daemonize, verbosity);
1682 b50a2b46 2022-12-29 stsp 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1683 b50a2b46 2022-12-29 stsp 	log_debug("proc %s %s is on fd %d",
1684 b50a2b46 2022-12-29 stsp 	    gotd_proc_names[proc->type], proc->repo_path,
1685 b50a2b46 2022-12-29 stsp 	    proc->pipe[0]);
1686 b50a2b46 2022-12-29 stsp 	proc->iev.handler = gotd_dispatch_repo_child;
1687 b50a2b46 2022-12-29 stsp 	proc->iev.events = EV_READ;
1688 b50a2b46 2022-12-29 stsp 	proc->iev.handler_arg = NULL;
1689 b50a2b46 2022-12-29 stsp 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1690 b50a2b46 2022-12-29 stsp 	    gotd_dispatch_repo_child, &proc->iev);
1691 b50a2b46 2022-12-29 stsp 	gotd_imsg_event_add(&proc->iev);
1692 b50a2b46 2022-12-29 stsp 
1693 f7a854cf 2023-01-10 stsp 	client->repo = proc;
1694 5e25db14 2022-12-29 stsp 	return NULL;
1695 5e25db14 2022-12-29 stsp }
1696 5e25db14 2022-12-29 stsp 
1697 5e25db14 2022-12-29 stsp static const struct got_error *
1698 5e25db14 2022-12-29 stsp start_auth_child(struct gotd_client *client, int required_auth,
1699 5e25db14 2022-12-29 stsp     struct gotd_repo *repo, char *argv0, const char *confpath,
1700 5e25db14 2022-12-29 stsp     int daemonize, int verbosity)
1701 5e25db14 2022-12-29 stsp {
1702 365cf0f3 2022-12-29 stsp 	const struct got_error *err = NULL;
1703 5e25db14 2022-12-29 stsp 	struct gotd_child_proc *proc;
1704 5e25db14 2022-12-29 stsp 	struct gotd_imsg_auth iauth;
1705 365cf0f3 2022-12-29 stsp 	int fd;
1706 5e25db14 2022-12-29 stsp 
1707 5e25db14 2022-12-29 stsp 	memset(&iauth, 0, sizeof(iauth));
1708 365cf0f3 2022-12-29 stsp 
1709 365cf0f3 2022-12-29 stsp 	fd = dup(client->fd);
1710 365cf0f3 2022-12-29 stsp 	if (fd == -1)
1711 365cf0f3 2022-12-29 stsp 		return got_error_from_errno("dup");
1712 5e25db14 2022-12-29 stsp 
1713 5e25db14 2022-12-29 stsp 	proc = calloc(1, sizeof(*proc));
1714 365cf0f3 2022-12-29 stsp 	if (proc == NULL) {
1715 365cf0f3 2022-12-29 stsp 		err = got_error_from_errno("calloc");
1716 365cf0f3 2022-12-29 stsp 		close(fd);
1717 365cf0f3 2022-12-29 stsp 		return err;
1718 365cf0f3 2022-12-29 stsp 	}
1719 839338f6 2023-06-22 op 
1720 839338f6 2023-06-22 op 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1721 839338f6 2023-06-22 op 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1722 5e25db14 2022-12-29 stsp 
1723 5e25db14 2022-12-29 stsp 	proc->type = PROC_AUTH;
1724 5e25db14 2022-12-29 stsp 	if (strlcpy(proc->repo_name, repo->name,
1725 5e25db14 2022-12-29 stsp 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1726 5e25db14 2022-12-29 stsp 		fatalx("repository name too long: %s", repo->name);
1727 5e25db14 2022-12-29 stsp 	log_debug("starting auth for uid %d repository %s",
1728 5e25db14 2022-12-29 stsp 	    client->euid, repo->name);
1729 9b7f22a6 2023-01-08 stsp 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1730 9b7f22a6 2023-01-08 stsp 	    sizeof(proc->repo_path))
1731 9b7f22a6 2023-01-08 stsp 		fatalx("repository path too long: %s", repo->path);
1732 5e25db14 2022-12-29 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1733 5e25db14 2022-12-29 stsp 	    PF_UNSPEC, proc->pipe) == -1)
1734 5e25db14 2022-12-29 stsp 		fatal("socketpair");
1735 5e25db14 2022-12-29 stsp 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1736 5e25db14 2022-12-29 stsp 	    confpath, proc->pipe[1], daemonize, verbosity);
1737 5e25db14 2022-12-29 stsp 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1738 5e25db14 2022-12-29 stsp 	log_debug("proc %s %s is on fd %d",
1739 5e25db14 2022-12-29 stsp 	    gotd_proc_names[proc->type], proc->repo_path,
1740 5e25db14 2022-12-29 stsp 	    proc->pipe[0]);
1741 5e25db14 2022-12-29 stsp 	proc->iev.handler = gotd_dispatch_auth_child;
1742 5e25db14 2022-12-29 stsp 	proc->iev.events = EV_READ;
1743 5e25db14 2022-12-29 stsp 	proc->iev.handler_arg = NULL;
1744 5e25db14 2022-12-29 stsp 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1745 5e25db14 2022-12-29 stsp 	    gotd_dispatch_auth_child, &proc->iev);
1746 5e25db14 2022-12-29 stsp 	gotd_imsg_event_add(&proc->iev);
1747 5e25db14 2022-12-29 stsp 
1748 5e25db14 2022-12-29 stsp 	iauth.euid = client->euid;
1749 5e25db14 2022-12-29 stsp 	iauth.egid = client->egid;
1750 5e25db14 2022-12-29 stsp 	iauth.required_auth = required_auth;
1751 5e25db14 2022-12-29 stsp 	iauth.client_id = client->id;
1752 5e25db14 2022-12-29 stsp 	if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
1753 365cf0f3 2022-12-29 stsp 	    PROC_GOTD, fd, &iauth, sizeof(iauth)) == -1) {
1754 5e25db14 2022-12-29 stsp 		log_warn("imsg compose AUTHENTICATE");
1755 365cf0f3 2022-12-29 stsp 		close(fd);
1756 365cf0f3 2022-12-29 stsp 		/* Let the auth_timeout handler tidy up. */
1757 365cf0f3 2022-12-29 stsp 	}
1758 b50a2b46 2022-12-29 stsp 
1759 5e25db14 2022-12-29 stsp 	client->auth = proc;
1760 5e25db14 2022-12-29 stsp 	client->required_auth = required_auth;
1761 b50a2b46 2022-12-29 stsp 	return NULL;
1762 eec68231 2022-12-14 stsp }
1763 eec68231 2022-12-14 stsp 
1764 eec68231 2022-12-14 stsp static void
1765 b0614828 2023-06-19 stsp apply_unveil_repo_readonly(const char *repo_path, int need_tmpdir)
1766 eec68231 2022-12-14 stsp {
1767 b0614828 2023-06-19 stsp 	if (need_tmpdir) {
1768 b0614828 2023-06-19 stsp 		if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1769 b0614828 2023-06-19 stsp 			fatal("unveil %s", GOT_TMPDIR_STR);
1770 b0614828 2023-06-19 stsp 	}
1771 b0614828 2023-06-19 stsp 
1772 eec68231 2022-12-14 stsp 	if (unveil(repo_path, "r") == -1)
1773 eec68231 2022-12-14 stsp 		fatal("unveil %s", repo_path);
1774 44587340 2022-12-30 stsp 
1775 44587340 2022-12-30 stsp 	if (unveil(NULL, NULL) == -1)
1776 44587340 2022-12-30 stsp 		fatal("unveil");
1777 44587340 2022-12-30 stsp }
1778 44587340 2022-12-30 stsp 
1779 44587340 2022-12-30 stsp static void
1780 ae7c1b78 2023-01-10 stsp apply_unveil_repo_readwrite(const char *repo_path)
1781 ae7c1b78 2023-01-10 stsp {
1782 ae7c1b78 2023-01-10 stsp 	if (unveil(repo_path, "rwc") == -1)
1783 ae7c1b78 2023-01-10 stsp 		fatal("unveil %s", repo_path);
1784 ae7c1b78 2023-01-10 stsp 
1785 ae7c1b78 2023-01-10 stsp 	if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1786 ae7c1b78 2023-01-10 stsp 		fatal("unveil %s", GOT_TMPDIR_STR);
1787 ae7c1b78 2023-01-10 stsp 
1788 ae7c1b78 2023-01-10 stsp 	if (unveil(NULL, NULL) == -1)
1789 ae7c1b78 2023-01-10 stsp 		fatal("unveil");
1790 ae7c1b78 2023-01-10 stsp }
1791 ae7c1b78 2023-01-10 stsp 
1792 ae7c1b78 2023-01-10 stsp static void
1793 44587340 2022-12-30 stsp apply_unveil_none(void)
1794 44587340 2022-12-30 stsp {
1795 44587340 2022-12-30 stsp 	if (unveil("/", "") == -1)
1796 44587340 2022-12-30 stsp 		fatal("unveil");
1797 eec68231 2022-12-14 stsp 
1798 eec68231 2022-12-14 stsp 	if (unveil(NULL, NULL) == -1)
1799 eec68231 2022-12-14 stsp 		fatal("unveil");
1800 13b2bc37 2022-10-23 stsp }
1801 13b2bc37 2022-10-23 stsp 
1802 13b2bc37 2022-10-23 stsp static void
1803 ae7c1b78 2023-01-10 stsp apply_unveil_selfexec(void)
1804 13b2bc37 2022-10-23 stsp {
1805 b50a2b46 2022-12-29 stsp 	if (unveil(gotd.argv0, "x") == -1)
1806 b50a2b46 2022-12-29 stsp 		fatal("unveil %s", gotd.argv0);
1807 b50a2b46 2022-12-29 stsp 
1808 13b2bc37 2022-10-23 stsp 	if (unveil(NULL, NULL) == -1)
1809 13b2bc37 2022-10-23 stsp 		fatal("unveil");
1810 13b2bc37 2022-10-23 stsp }
1811 13b2bc37 2022-10-23 stsp 
1812 abe89edb 2023-11-16 stsp static void
1813 abe89edb 2023-11-16 stsp set_max_datasize(void)
1814 abe89edb 2023-11-16 stsp {
1815 abe89edb 2023-11-16 stsp 	struct rlimit rl;
1816 abe89edb 2023-11-16 stsp 
1817 abe89edb 2023-11-16 stsp 	if (getrlimit(RLIMIT_DATA, &rl) != 0)
1818 abe89edb 2023-11-16 stsp 		return;
1819 abe89edb 2023-11-16 stsp 
1820 abe89edb 2023-11-16 stsp 	rl.rlim_cur = rl.rlim_max;
1821 abe89edb 2023-11-16 stsp 	setrlimit(RLIMIT_DATA, &rl);
1822 abe89edb 2023-11-16 stsp }
1823 abe89edb 2023-11-16 stsp 
1824 13b2bc37 2022-10-23 stsp int
1825 13b2bc37 2022-10-23 stsp main(int argc, char **argv)
1826 13b2bc37 2022-10-23 stsp {
1827 13b2bc37 2022-10-23 stsp 	const struct got_error *error = NULL;
1828 13b2bc37 2022-10-23 stsp 	int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
1829 13b2bc37 2022-10-23 stsp 	const char *confpath = GOTD_CONF_PATH;
1830 13b2bc37 2022-10-23 stsp 	char *argv0 = argv[0];
1831 13b2bc37 2022-10-23 stsp 	char title[2048];
1832 13b2bc37 2022-10-23 stsp 	struct passwd *pw = NULL;
1833 13b2bc37 2022-10-23 stsp 	char *repo_path = NULL;
1834 13b2bc37 2022-10-23 stsp 	enum gotd_procid proc_id = PROC_GOTD;
1835 839338f6 2023-06-22 op 	struct event evsigint, evsigterm, evsighup, evsigusr1, evsigchld;
1836 13b2bc37 2022-10-23 stsp 	int *pack_fds = NULL, *temp_fds = NULL;
1837 9afa3de2 2023-04-04 stsp 	struct gotd_repo *repo = NULL;
1838 13b2bc37 2022-10-23 stsp 
1839 839338f6 2023-06-22 op 	TAILQ_INIT(&procs);
1840 839338f6 2023-06-22 op 
1841 13b2bc37 2022-10-23 stsp 	log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
1842 13b2bc37 2022-10-23 stsp 
1843 b0614828 2023-06-19 stsp 	while ((ch = getopt(argc, argv, "Adf:LnP:RsSvW")) != -1) {
1844 13b2bc37 2022-10-23 stsp 		switch (ch) {
1845 5e25db14 2022-12-29 stsp 		case 'A':
1846 5e25db14 2022-12-29 stsp 			proc_id = PROC_AUTH;
1847 5e25db14 2022-12-29 stsp 			break;
1848 13b2bc37 2022-10-23 stsp 		case 'd':
1849 13b2bc37 2022-10-23 stsp 			daemonize = 0;
1850 13b2bc37 2022-10-23 stsp 			break;
1851 13b2bc37 2022-10-23 stsp 		case 'f':
1852 13b2bc37 2022-10-23 stsp 			confpath = optarg;
1853 13b2bc37 2022-10-23 stsp 			break;
1854 d93ecf7d 2022-12-14 stsp 		case 'L':
1855 d93ecf7d 2022-12-14 stsp 			proc_id = PROC_LISTEN;
1856 d93ecf7d 2022-12-14 stsp 			break;
1857 13b2bc37 2022-10-23 stsp 		case 'n':
1858 13b2bc37 2022-10-23 stsp 			noaction = 1;
1859 13b2bc37 2022-10-23 stsp 			break;
1860 6f319063 2022-10-27 stsp 		case 'P':
1861 6f319063 2022-10-27 stsp 			repo_path = realpath(optarg, NULL);
1862 6f319063 2022-10-27 stsp 			if (repo_path == NULL)
1863 6f319063 2022-10-27 stsp 				fatal("realpath '%s'", optarg);
1864 13b2bc37 2022-10-23 stsp 			break;
1865 13b2bc37 2022-10-23 stsp 		case 'R':
1866 13b2bc37 2022-10-23 stsp 			proc_id = PROC_REPO_READ;
1867 13b2bc37 2022-10-23 stsp 			break;
1868 b0614828 2023-06-19 stsp 		case 's':
1869 b0614828 2023-06-19 stsp 			proc_id = PROC_SESSION_READ;
1870 b0614828 2023-06-19 stsp 			break;
1871 ae7c1b78 2023-01-10 stsp 		case 'S':
1872 b0614828 2023-06-19 stsp 			proc_id = PROC_SESSION_WRITE;
1873 ae7c1b78 2023-01-10 stsp 			break;
1874 6f319063 2022-10-27 stsp 		case 'v':
1875 6f319063 2022-10-27 stsp 			if (verbosity < 3)
1876 6f319063 2022-10-27 stsp 				verbosity++;
1877 6f319063 2022-10-27 stsp 			break;
1878 13b2bc37 2022-10-23 stsp 		case 'W':
1879 13b2bc37 2022-10-23 stsp 			proc_id = PROC_REPO_WRITE;
1880 13b2bc37 2022-10-23 stsp 			break;
1881 13b2bc37 2022-10-23 stsp 		default:
1882 13b2bc37 2022-10-23 stsp 			usage();
1883 13b2bc37 2022-10-23 stsp 		}
1884 13b2bc37 2022-10-23 stsp 	}
1885 13b2bc37 2022-10-23 stsp 
1886 13b2bc37 2022-10-23 stsp 	argc -= optind;
1887 13b2bc37 2022-10-23 stsp 	argv += optind;
1888 13b2bc37 2022-10-23 stsp 
1889 13b2bc37 2022-10-23 stsp 	if (argc != 0)
1890 13b2bc37 2022-10-23 stsp 		usage();
1891 b50a2b46 2022-12-29 stsp 
1892 b50a2b46 2022-12-29 stsp 	if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
1893 13b2bc37 2022-10-23 stsp 		fatalx("need root privileges");
1894 13b2bc37 2022-10-23 stsp 
1895 4b3827cd 2023-07-08 stsp 	if (parse_config(confpath, proc_id, &gotd) != 0)
1896 13b2bc37 2022-10-23 stsp 		return 1;
1897 13b2bc37 2022-10-23 stsp 
1898 13b2bc37 2022-10-23 stsp 	pw = getpwnam(gotd.user_name);
1899 13b2bc37 2022-10-23 stsp 	if (pw == NULL)
1900 898c8f8f 2022-12-29 op 		fatalx("user %s not found", gotd.user_name);
1901 13b2bc37 2022-10-23 stsp 
1902 f4e8c21c 2023-01-17 op 	if (pw->pw_uid == 0)
1903 f4e8c21c 2023-01-17 op 		fatalx("cannot run %s as the superuser", getprogname());
1904 13b2bc37 2022-10-23 stsp 
1905 f4e8c21c 2023-01-17 op 	if (noaction) {
1906 f4e8c21c 2023-01-17 op 		fprintf(stderr, "configuration OK\n");
1907 13b2bc37 2022-10-23 stsp 		return 0;
1908 f4e8c21c 2023-01-17 op 	}
1909 13b2bc37 2022-10-23 stsp 
1910 f4e8c21c 2023-01-17 op 	gotd.argv0 = argv0;
1911 f4e8c21c 2023-01-17 op 	gotd.daemonize = daemonize;
1912 f4e8c21c 2023-01-17 op 	gotd.verbosity = verbosity;
1913 f4e8c21c 2023-01-17 op 	gotd.confpath = confpath;
1914 f4e8c21c 2023-01-17 op 
1915 f4e8c21c 2023-01-17 op 	/* Require an absolute path in argv[0] for reliable re-exec. */
1916 f4e8c21c 2023-01-17 op 	if (!got_path_is_absolute(argv0))
1917 f4e8c21c 2023-01-17 op 		fatalx("bad path \"%s\": must be an absolute path", argv0);
1918 f4e8c21c 2023-01-17 op 
1919 f4e8c21c 2023-01-17 op 	log_init(daemonize ? 0 : 1, LOG_DAEMON);
1920 f4e8c21c 2023-01-17 op 	log_setverbose(verbosity);
1921 f4e8c21c 2023-01-17 op 
1922 b1142068 2022-12-05 stsp 	if (proc_id == PROC_GOTD) {
1923 d93ecf7d 2022-12-14 stsp 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1924 d93ecf7d 2022-12-14 stsp 		arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
1925 d93ecf7d 2022-12-14 stsp 		if (daemonize && daemon(1, 0) == -1)
1926 d93ecf7d 2022-12-14 stsp 			fatal("daemon");
1927 f7eb3370 2023-01-23 stsp 		gotd.pid = getpid();
1928 f7eb3370 2023-01-23 stsp 		start_listener(argv0, confpath, daemonize, verbosity);
1929 d93ecf7d 2022-12-14 stsp 	} else if (proc_id == PROC_LISTEN) {
1930 d93ecf7d 2022-12-14 stsp 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1931 b1142068 2022-12-05 stsp 		if (verbosity) {
1932 b1142068 2022-12-05 stsp 			log_info("socket: %s", gotd.unix_socket_path);
1933 b1142068 2022-12-05 stsp 			log_info("user: %s", pw->pw_name);
1934 b1142068 2022-12-05 stsp 		}
1935 13b2bc37 2022-10-23 stsp 
1936 13b2bc37 2022-10-23 stsp 		fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
1937 6f854dde 2023-01-04 stsp 		    pw->pw_gid);
1938 13b2bc37 2022-10-23 stsp 		if (fd == -1) {
1939 13b2bc37 2022-10-23 stsp 			fatal("cannot listen on unix socket %s",
1940 13b2bc37 2022-10-23 stsp 			    gotd.unix_socket_path);
1941 13b2bc37 2022-10-23 stsp 		}
1942 5e25db14 2022-12-29 stsp 	} else if (proc_id == PROC_AUTH) {
1943 5e25db14 2022-12-29 stsp 		snprintf(title, sizeof(title), "%s %s",
1944 5e25db14 2022-12-29 stsp 		    gotd_proc_names[proc_id], repo_path);
1945 ae7c1b78 2023-01-10 stsp 	} else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE ||
1946 b0614828 2023-06-19 stsp 	    proc_id == PROC_SESSION_READ || proc_id == PROC_SESSION_WRITE) {
1947 13b2bc37 2022-10-23 stsp 		error = got_repo_pack_fds_open(&pack_fds);
1948 13b2bc37 2022-10-23 stsp 		if (error != NULL)
1949 13b2bc37 2022-10-23 stsp 			fatalx("cannot open pack tempfiles: %s", error->msg);
1950 13b2bc37 2022-10-23 stsp 		error = got_repo_temp_fds_open(&temp_fds);
1951 13b2bc37 2022-10-23 stsp 		if (error != NULL)
1952 13b2bc37 2022-10-23 stsp 			fatalx("cannot open pack tempfiles: %s", error->msg);
1953 13b2bc37 2022-10-23 stsp 		if (repo_path == NULL)
1954 13b2bc37 2022-10-23 stsp 			fatalx("repository path not specified");
1955 13b2bc37 2022-10-23 stsp 		snprintf(title, sizeof(title), "%s %s",
1956 13b2bc37 2022-10-23 stsp 		    gotd_proc_names[proc_id], repo_path);
1957 13b2bc37 2022-10-23 stsp 	} else
1958 13b2bc37 2022-10-23 stsp 		fatal("invalid process id %d", proc_id);
1959 13b2bc37 2022-10-23 stsp 
1960 13b2bc37 2022-10-23 stsp 	setproctitle("%s", title);
1961 13b2bc37 2022-10-23 stsp 	log_procinit(title);
1962 13b2bc37 2022-10-23 stsp 
1963 13b2bc37 2022-10-23 stsp 	/* Drop root privileges. */
1964 13b2bc37 2022-10-23 stsp 	if (setgid(pw->pw_gid) == -1)
1965 13b2bc37 2022-10-23 stsp 		fatal("setgid %d failed", pw->pw_gid);
1966 13b2bc37 2022-10-23 stsp 	if (setuid(pw->pw_uid) == -1)
1967 13b2bc37 2022-10-23 stsp 		fatal("setuid %d failed", pw->pw_uid);
1968 13b2bc37 2022-10-23 stsp 
1969 13b2bc37 2022-10-23 stsp 	event_init();
1970 13b2bc37 2022-10-23 stsp 
1971 13b2bc37 2022-10-23 stsp 	switch (proc_id) {
1972 13b2bc37 2022-10-23 stsp 	case PROC_GOTD:
1973 13b2bc37 2022-10-23 stsp #ifndef PROFILE
1974 ae7c1b78 2023-01-10 stsp 		/* "exec" promise will be limited to argv[0] via unveil(2). */
1975 ae7c1b78 2023-01-10 stsp 		if (pledge("stdio proc exec sendfd recvfd unveil", NULL) == -1)
1976 13b2bc37 2022-10-23 stsp 			err(1, "pledge");
1977 13b2bc37 2022-10-23 stsp #endif
1978 13b2bc37 2022-10-23 stsp 		break;
1979 d93ecf7d 2022-12-14 stsp 	case PROC_LISTEN:
1980 d93ecf7d 2022-12-14 stsp #ifndef PROFILE
1981 77f619a8 2023-01-04 stsp 		if (pledge("stdio sendfd unix unveil", NULL) == -1)
1982 d93ecf7d 2022-12-14 stsp 			err(1, "pledge");
1983 d93ecf7d 2022-12-14 stsp #endif
1984 77f619a8 2023-01-04 stsp 		/*
1985 77f619a8 2023-01-04 stsp 		 * Ensure that AF_UNIX bind(2) cannot be used with any other
1986 77f619a8 2023-01-04 stsp 		 * sockets by revoking all filesystem access via unveil(2).
1987 77f619a8 2023-01-04 stsp 		 */
1988 77f619a8 2023-01-04 stsp 		apply_unveil_none();
1989 77f619a8 2023-01-04 stsp 
1990 40b85cca 2023-01-03 stsp 		listen_main(title, fd, gotd.connection_limits,
1991 40b85cca 2023-01-03 stsp 		    gotd.nconnection_limits);
1992 d93ecf7d 2022-12-14 stsp 		/* NOTREACHED */
1993 d93ecf7d 2022-12-14 stsp 		break;
1994 5e25db14 2022-12-29 stsp 	case PROC_AUTH:
1995 5e25db14 2022-12-29 stsp #ifndef PROFILE
1996 44587340 2022-12-30 stsp 		if (pledge("stdio getpw recvfd unix unveil", NULL) == -1)
1997 5e25db14 2022-12-29 stsp 			err(1, "pledge");
1998 5e25db14 2022-12-29 stsp #endif
1999 44587340 2022-12-30 stsp 		/*
2000 44587340 2022-12-30 stsp 		 * We need the "unix" pledge promise for getpeername(2) only.
2001 44587340 2022-12-30 stsp 		 * Ensure that AF_UNIX bind(2) cannot be used by revoking all
2002 44587340 2022-12-30 stsp 		 * filesystem access via unveil(2). Access to password database
2003 44587340 2022-12-30 stsp 		 * files will still work since "getpw" bypasses unveil(2).
2004 44587340 2022-12-30 stsp 		 */
2005 44587340 2022-12-30 stsp 		apply_unveil_none();
2006 44587340 2022-12-30 stsp 
2007 5e25db14 2022-12-29 stsp 		auth_main(title, &gotd.repos, repo_path);
2008 5e25db14 2022-12-29 stsp 		/* NOTREACHED */
2009 5e25db14 2022-12-29 stsp 		break;
2010 b0614828 2023-06-19 stsp 	case PROC_SESSION_READ:
2011 b0614828 2023-06-19 stsp 	case PROC_SESSION_WRITE:
2012 ae7c1b78 2023-01-10 stsp #ifndef PROFILE
2013 ae7c1b78 2023-01-10 stsp 		/*
2014 ae7c1b78 2023-01-10 stsp 		 * The "recvfd" promise is only needed during setup and
2015 ae7c1b78 2023-01-10 stsp 		 * will be removed in a later pledge(2) call.
2016 ae7c1b78 2023-01-10 stsp 		 */
2017 ae7c1b78 2023-01-10 stsp 		if (pledge("stdio rpath wpath cpath recvfd sendfd fattr flock "
2018 ae7c1b78 2023-01-10 stsp 		    "unveil", NULL) == -1)
2019 ae7c1b78 2023-01-10 stsp 			err(1, "pledge");
2020 ae7c1b78 2023-01-10 stsp #endif
2021 b0614828 2023-06-19 stsp 		if (proc_id == PROC_SESSION_READ)
2022 b0614828 2023-06-19 stsp 			apply_unveil_repo_readonly(repo_path, 1);
2023 b0614828 2023-06-19 stsp 		else
2024 b0614828 2023-06-19 stsp 			apply_unveil_repo_readwrite(repo_path);
2025 ae7c1b78 2023-01-10 stsp 		session_main(title, repo_path, pack_fds, temp_fds,
2026 b0614828 2023-06-19 stsp 		    &gotd.request_timeout, proc_id);
2027 ae7c1b78 2023-01-10 stsp 		/* NOTREACHED */
2028 ae7c1b78 2023-01-10 stsp 		break;
2029 13b2bc37 2022-10-23 stsp 	case PROC_REPO_READ:
2030 abe89edb 2023-11-16 stsp 		set_max_datasize();
2031 13b2bc37 2022-10-23 stsp #ifndef PROFILE
2032 eec68231 2022-12-14 stsp 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2033 13b2bc37 2022-10-23 stsp 			err(1, "pledge");
2034 13b2bc37 2022-10-23 stsp #endif
2035 b0614828 2023-06-19 stsp 		apply_unveil_repo_readonly(repo_path, 0);
2036 eec68231 2022-12-14 stsp 		repo_read_main(title, repo_path, pack_fds, temp_fds);
2037 13b2bc37 2022-10-23 stsp 		/* NOTREACHED */
2038 13b2bc37 2022-10-23 stsp 		exit(0);
2039 13b2bc37 2022-10-23 stsp 	case PROC_REPO_WRITE:
2040 abe89edb 2023-11-16 stsp 		set_max_datasize();
2041 13b2bc37 2022-10-23 stsp #ifndef PROFILE
2042 eec68231 2022-12-14 stsp 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2043 13b2bc37 2022-10-23 stsp 			err(1, "pledge");
2044 13b2bc37 2022-10-23 stsp #endif
2045 b0614828 2023-06-19 stsp 		apply_unveil_repo_readonly(repo_path, 0);
2046 9afa3de2 2023-04-04 stsp 		repo = gotd_find_repo_by_path(repo_path, &gotd);
2047 9afa3de2 2023-04-04 stsp 		if (repo == NULL)
2048 9afa3de2 2023-04-04 stsp 			fatalx("no repository for path %s", repo_path);
2049 9afa3de2 2023-04-04 stsp 		repo_write_main(title, repo_path, pack_fds, temp_fds,
2050 9afa3de2 2023-04-04 stsp 		    &repo->protected_tag_namespaces,
2051 9afa3de2 2023-04-04 stsp 		    &repo->protected_branch_namespaces,
2052 9afa3de2 2023-04-04 stsp 		    &repo->protected_branches);
2053 13b2bc37 2022-10-23 stsp 		/* NOTREACHED */
2054 13b2bc37 2022-10-23 stsp 		exit(0);
2055 13b2bc37 2022-10-23 stsp 	default:
2056 13b2bc37 2022-10-23 stsp 		fatal("invalid process id %d", proc_id);
2057 13b2bc37 2022-10-23 stsp 	}
2058 13b2bc37 2022-10-23 stsp 
2059 13b2bc37 2022-10-23 stsp 	if (proc_id != PROC_GOTD)
2060 13b2bc37 2022-10-23 stsp 		fatal("invalid process id %d", proc_id);
2061 13b2bc37 2022-10-23 stsp 
2062 839338f6 2023-06-22 op 	evtimer_set(&gotd.listen_proc->tmo, kill_proc_timeout,
2063 839338f6 2023-06-22 op 	    gotd.listen_proc);
2064 839338f6 2023-06-22 op 
2065 ae7c1b78 2023-01-10 stsp 	apply_unveil_selfexec();
2066 13b2bc37 2022-10-23 stsp 
2067 13b2bc37 2022-10-23 stsp 	signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2068 13b2bc37 2022-10-23 stsp 	signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2069 13b2bc37 2022-10-23 stsp 	signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2070 13b2bc37 2022-10-23 stsp 	signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2071 839338f6 2023-06-22 op 	signal_set(&evsigchld, SIGCHLD, gotd_sighdlr, NULL);
2072 13b2bc37 2022-10-23 stsp 	signal(SIGPIPE, SIG_IGN);
2073 13b2bc37 2022-10-23 stsp 
2074 13b2bc37 2022-10-23 stsp 	signal_add(&evsigint, NULL);
2075 13b2bc37 2022-10-23 stsp 	signal_add(&evsigterm, NULL);
2076 13b2bc37 2022-10-23 stsp 	signal_add(&evsighup, NULL);
2077 13b2bc37 2022-10-23 stsp 	signal_add(&evsigusr1, NULL);
2078 839338f6 2023-06-22 op 	signal_add(&evsigchld, NULL);
2079 13b2bc37 2022-10-23 stsp 
2080 c929736a 2023-06-22 op 	gotd_imsg_event_add(&gotd.listen_proc->iev);
2081 13b2bc37 2022-10-23 stsp 
2082 13b2bc37 2022-10-23 stsp 	event_dispatch();
2083 13b2bc37 2022-10-23 stsp 
2084 13b2bc37 2022-10-23 stsp 	free(repo_path);
2085 ae7c1b78 2023-01-10 stsp 	gotd_shutdown();
2086 ae7c1b78 2023-01-10 stsp 
2087 13b2bc37 2022-10-23 stsp 	return 0;
2088 13b2bc37 2022-10-23 stsp }