2 b09c1279 2023-03-28 stsp * Copyright (c) 2023 Stefan Sperling <stsp@openbsd.org>
4 b09c1279 2023-03-28 stsp * Permission to use, copy, modify, and distribute this software for any
5 b09c1279 2023-03-28 stsp * purpose with or without fee is hereby granted, provided that the above
6 b09c1279 2023-03-28 stsp * copyright notice and this permission notice appear in all copies.
8 b09c1279 2023-03-28 stsp * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 b09c1279 2023-03-28 stsp * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 b09c1279 2023-03-28 stsp * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 b09c1279 2023-03-28 stsp * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 b09c1279 2023-03-28 stsp * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 b09c1279 2023-03-28 stsp * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 b09c1279 2023-03-28 stsp * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 b09c1279 2023-03-28 stsp * Resolve path namespace conflicts for git-upload-pack and git-receive-pack.
21 b09c1279 2023-03-28 stsp #include <sys/queue.h>
22 b09c1279 2023-03-28 stsp #include <sys/types.h>
23 b09c1279 2023-03-28 stsp #include <sys/uio.h>
25 b09c1279 2023-03-28 stsp #include <err.h>
26 b09c1279 2023-03-28 stsp #include <errno.h>
27 b09c1279 2023-03-28 stsp #include <event.h>
28 b09c1279 2023-03-28 stsp #include <imsg.h>
29 b09c1279 2023-03-28 stsp #include <limits.h>
30 b09c1279 2023-03-28 stsp #include <stdio.h>
31 b09c1279 2023-03-28 stsp #include <stdlib.h>
32 b09c1279 2023-03-28 stsp #include <string.h>
33 b09c1279 2023-03-28 stsp #include <sha1.h>
34 b09c1279 2023-03-28 stsp #include <sha2.h>
35 b09c1279 2023-03-28 stsp #include <syslog.h>
36 b09c1279 2023-03-28 stsp #include <util.h>
37 b09c1279 2023-03-28 stsp #include <unistd.h>
39 b09c1279 2023-03-28 stsp #include "got_error.h"
40 b09c1279 2023-03-28 stsp #include "got_path.h"
41 b09c1279 2023-03-28 stsp #include "got_serve.h"
43 b09c1279 2023-03-28 stsp #include "gotd.h"
44 b09c1279 2023-03-28 stsp #include "log.h"
46 b09c1279 2023-03-28 stsp #ifndef GITWRAPPER_GIT_LIBEXEC_DIR
47 b09c1279 2023-03-28 stsp #define GITWRAPPER_GIT_LIBEXEC_DIR "/usr/local/libexec/git"
50 b09c1279 2023-03-28 stsp #ifndef GITWRAPPER_MY_SERVER_PROG
51 b09c1279 2023-03-28 stsp #define GITWRAPPER_MY_SERVER_PROG "gotsh"
55 b09c1279 2023-03-28 stsp __dead static void
58 b09c1279 2023-03-28 stsp fprintf(stderr, "usage: %s -c '%s|%s repository-path'\n",
59 b09c1279 2023-03-28 stsp getprogname(), GOT_SERVE_CMD_SEND, GOT_SERVE_CMD_FETCH);
64 b09c1279 2023-03-28 stsp * Unveil the specific programs we want to start and hide everything else.
65 b09c1279 2023-03-28 stsp * This is important to limit the impact of our "exec" pledge.
67 b09c1279 2023-03-28 stsp static const struct got_error *
68 b09c1279 2023-03-28 stsp apply_unveil(const char *myserver)
70 b09c1279 2023-03-28 stsp const char *fetchcmd = GITWRAPPER_GIT_LIBEXEC_DIR "/" \
71 b09c1279 2023-03-28 stsp GOT_SERVE_CMD_FETCH;
72 b09c1279 2023-03-28 stsp const char *sendcmd = GITWRAPPER_GIT_LIBEXEC_DIR "/" \
73 b09c1279 2023-03-28 stsp GOT_SERVE_CMD_SEND;
75 b09c1279 2023-03-28 stsp #ifdef PROFILE
76 b09c1279 2023-03-28 stsp if (unveil("gmon.out", "rwc") != 0)
77 b09c1279 2023-03-28 stsp return got_error_from_errno2("unveil", "gmon.out");
79 b09c1279 2023-03-28 stsp if (unveil(fetchcmd, "x") != 0)
80 b09c1279 2023-03-28 stsp return got_error_from_errno2("unveil", fetchcmd);
82 b09c1279 2023-03-28 stsp if (unveil(sendcmd, "x") != 0)
83 b09c1279 2023-03-28 stsp return got_error_from_errno2("unveil", sendcmd);
85 b09c1279 2023-03-28 stsp if (myserver && unveil(myserver, "x") != 0)
86 b09c1279 2023-03-28 stsp return got_error_from_errno2("unveil", myserver);
88 b09c1279 2023-03-28 stsp if (unveil(NULL, NULL) != 0)
89 b09c1279 2023-03-28 stsp return got_error_from_errno("unveil");
91 b09c1279 2023-03-28 stsp return NULL;
95 b09c1279 2023-03-28 stsp main(int argc, char *argv[])
97 b09c1279 2023-03-28 stsp const struct got_error *error;
98 b09c1279 2023-03-28 stsp const char *confpath = NULL;
99 b09c1279 2023-03-28 stsp char *command = NULL, *repo_name = NULL; /* for matching gotd.conf */
100 b09c1279 2023-03-28 stsp char *myserver = NULL;
101 b09c1279 2023-03-28 stsp const char *repo_path = NULL; /* as passed on the command line */
102 b09c1279 2023-03-28 stsp const char *relpath;
103 b09c1279 2023-03-28 stsp char *gitcommand = NULL;
104 b09c1279 2023-03-28 stsp struct gotd gotd;
105 b09c1279 2023-03-28 stsp struct gotd_repo *repo = NULL;
107 b09c1279 2023-03-28 stsp log_init(1, LOG_USER); /* Log to stderr. */
109 b09c1279 2023-03-28 stsp #ifndef PROFILE
110 c5d17ec8 2023-03-28 op if (pledge("stdio rpath exec unveil", NULL) == -1)
111 b09c1279 2023-03-28 stsp err(1, "pledge");
115 b09c1279 2023-03-28 stsp * Look up our own server program in PATH so we can unveil(2) it.
116 b09c1279 2023-03-28 stsp * This call only errors out upon memory allocation failure.
117 b09c1279 2023-03-28 stsp * If the program cannot be found then myserver will be set to NULL.
119 b09c1279 2023-03-28 stsp error = got_path_find_prog(&myserver, GITWRAPPER_MY_SERVER_PROG);
124 b09c1279 2023-03-28 stsp * Run parse_config() before unveil(2) because parse_config()
125 b09c1279 2023-03-28 stsp * checks whether repository paths exist on disk.
126 b09c1279 2023-03-28 stsp * Parsing errors and warnings will be logged to stderr.
127 b09c1279 2023-03-28 stsp * Upon failure we will run Git's native tooling so do not
128 b09c1279 2023-03-28 stsp * bother checking for errors here.
130 b09c1279 2023-03-28 stsp confpath = getenv("GOTD_CONF_PATH");
131 b09c1279 2023-03-28 stsp if (confpath == NULL)
132 b09c1279 2023-03-28 stsp confpath = GOTD_CONF_PATH;
133 e9e0377f 2023-03-29 stsp parse_config(confpath, PROC_GOTD, &gotd, 0);
135 b09c1279 2023-03-28 stsp error = apply_unveil(myserver);
139 b09c1279 2023-03-28 stsp #ifndef PROFILE
140 c5d17ec8 2023-03-28 op if (pledge("stdio exec", NULL) == -1)
141 b09c1279 2023-03-28 stsp err(1, "pledge");
144 b09c1279 2023-03-28 stsp if (strcmp(getprogname(), GOT_SERVE_CMD_SEND) == 0 ||
145 b09c1279 2023-03-28 stsp strcmp(getprogname(), GOT_SERVE_CMD_FETCH) == 0) {
146 b09c1279 2023-03-28 stsp if (argc != 2)
148 b09c1279 2023-03-28 stsp command = strdup(getprogname());
149 b09c1279 2023-03-28 stsp if (command == NULL) {
150 b09c1279 2023-03-28 stsp error = got_error_from_errno("strdup");
153 b09c1279 2023-03-28 stsp repo_path = argv[1];
154 b09c1279 2023-03-28 stsp relpath = argv[1];
155 b09c1279 2023-03-28 stsp while (relpath[0] == '/')
157 b09c1279 2023-03-28 stsp repo_name = strdup(relpath);
158 b09c1279 2023-03-28 stsp if (repo_name == NULL) {
159 b09c1279 2023-03-28 stsp error = got_error_from_errno("strdup");
163 b09c1279 2023-03-28 stsp if (argc != 3 || strcmp(argv[1], "-c") != 0)
165 b09c1279 2023-03-28 stsp repo_path = argv[2];
166 b09c1279 2023-03-28 stsp error = got_serve_parse_command(&command, &repo_name,
167 b09c1279 2023-03-28 stsp repo_path);
168 b09c1279 2023-03-28 stsp if (error && error->code == GOT_ERR_BAD_PACKET)
174 b09c1279 2023-03-28 stsp repo = gotd_find_repo_by_name(repo_name, &gotd);
177 6c5befc7 2023-03-28 stsp * Invoke our custom Git server if the repository was found
178 6c5befc7 2023-03-28 stsp * in gotd.conf. Otherwise invoke native git(1) tooling.
181 c5d17ec8 2023-03-28 op if (myserver == NULL) {
182 c5d17ec8 2023-03-28 op error = got_error_fmt(GOT_ERR_NO_PROG,
183 c5d17ec8 2023-03-28 op "cannot run '%s'",
184 c5d17ec8 2023-03-28 op GITWRAPPER_MY_SERVER_PROG);
187 c5d17ec8 2023-03-28 op execl(myserver, command, repo_name, (char *)NULL);
188 c5d17ec8 2023-03-28 op error = got_error_from_errno2("execl", myserver);
190 c5d17ec8 2023-03-28 op if (asprintf(&gitcommand, "%s/%s",
191 c5d17ec8 2023-03-28 op GITWRAPPER_GIT_LIBEXEC_DIR, command) == -1) {
192 c5d17ec8 2023-03-28 op error = got_error_from_errno("asprintf");
195 c5d17ec8 2023-03-28 op execl(gitcommand, gitcommand, repo_path, (char *)NULL);
196 c5d17ec8 2023-03-28 op error = got_error_from_errno2("execl", gitcommand);
200 b09c1279 2023-03-28 stsp free(command);
201 b09c1279 2023-03-28 stsp free(repo_name);
202 b09c1279 2023-03-28 stsp free(myserver);
203 b09c1279 2023-03-28 stsp free(gitcommand);
204 b09c1279 2023-03-28 stsp if (error) {
205 b09c1279 2023-03-28 stsp fprintf(stderr, "%s: %s\n", getprogname(), error->msg);