2 * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>
3 * Copyright (c) 2015 Ted Unangst <tedu@openbsd.org>
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 #include <sys/types.h>
19 #include <sys/socket.h>
20 #include <sys/queue.h>
38 #include "got_error.h"
45 static struct gotd_auth {
48 struct gotd_repo *repo;
51 static void auth_shutdown(void);
54 auth_sighdlr(int sig, short event, void *arg)
57 * Normal signal handler rules don't apply because libevent
72 fatalx("unexpected signal");
77 uidcheck(const char *s, uid_t desired)
81 if (gotd_parseuid(s, &uid) != 0)
89 parsegid(const char *s, gid_t *gid)
94 if ((gr = getgrnam(s)) != NULL) {
100 *gid = strtonum(s, 0, GID_MAX - 1, &errstr);
107 match_identifier(const char *identifier, gid_t *groups, int ngroups,
108 uid_t euid, gid_t egid)
112 if (identifier[0] == ':') {
114 if (parsegid(identifier + 1, &rgid) == -1)
118 for (i = 0; i < ngroups; i++) {
119 if (rgid == groups[i])
124 } else if (uidcheck(identifier, euid) != 0)
130 static const struct got_error *
131 auth_check(char **username, struct gotd_access_rule_list *rules,
132 const char *repo_name, uid_t euid, gid_t egid, int required_auth)
134 struct gotd_access_rule *rule;
135 enum gotd_access access = GOTD_ACCESS_DENIED;
137 gid_t groups[NGROUPS_MAX];
138 int ngroups = NGROUPS_MAX;
145 return got_error_from_errno("getpwuid");
147 return got_error_set_errno(EACCES, repo_name);
150 *username = strdup(pw->pw_name);
151 if (*username == NULL)
152 return got_error_from_errno("strdup");
154 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups) == -1)
155 log_warnx("group membership list truncated");
157 STAILQ_FOREACH(rule, rules, entry) {
158 if (!match_identifier(rule->identifier, groups, ngroups,
162 access = rule->access;
163 if (rule->access == GOTD_ACCESS_PERMITTED &&
164 (rule->authorization & required_auth) != required_auth)
165 access = GOTD_ACCESS_DENIED;
168 if (access == GOTD_ACCESS_DENIED)
169 return got_error_set_errno(EACCES, repo_name);
171 if (access == GOTD_ACCESS_PERMITTED)
174 /* should not happen, this would be a bug */
175 return got_error_msg(GOT_ERR_NOT_IMPL, "bad access rule");
178 static const struct got_error *
179 recv_authreq(struct imsg *imsg, struct gotd_imsgev *iev)
181 const struct got_error *err;
182 struct imsgbuf *ibuf = &iev->ibuf;
183 struct gotd_imsg_auth iauth;
187 char *username = NULL;
189 const size_t maxlen = MAX_IMSGSIZE - IMSG_HEADER_SIZE;
192 log_debug("authentication request received");
194 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
195 if (datalen != sizeof(iauth))
196 return got_error(GOT_ERR_PRIVSEP_LEN);
198 memcpy(&iauth, imsg->data, datalen);
200 fd = imsg_get_fd(imsg);
202 return got_error(GOT_ERR_PRIVSEP_NO_FD);
204 if (getpeereid(fd, &euid, &egid) == -1)
205 return got_error_from_errno("getpeerid");
207 if (iauth.euid != euid)
208 return got_error(GOT_ERR_UID);
209 if (iauth.egid != egid)
210 return got_error(GOT_ERR_GID);
212 log_debug("authenticating uid %d gid %d", euid, egid);
214 err = auth_check(&username, &gotd_auth.repo->rules,
215 gotd_auth.repo->name, iauth.euid, iauth.egid, iauth.required_auth);
217 gotd_imsg_send_error(ibuf, PROC_AUTH, iauth.client_id, err);
221 len = strlen(username);
225 if (gotd_imsg_compose_event(iev, GOTD_IMSG_ACCESS_GRANTED,
226 PROC_AUTH, -1, username, len) == -1)
227 err = got_error_from_errno("imsg compose ACCESS_GRANTED");
234 auth_dispatch(int fd, short event, void *arg)
236 const struct got_error *err = NULL;
237 struct gotd_imsgev *iev = arg;
238 struct imsgbuf *ibuf = &iev->ibuf;
243 if (event & EV_READ) {
244 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
245 fatal("imsg_read error");
246 if (n == 0) /* Connection closed. */
250 if (event & EV_WRITE) {
251 n = msgbuf_write(&ibuf->w);
252 if (n == -1 && errno != EAGAIN)
253 fatal("msgbuf_write");
254 if (n == 0) /* Connection closed. */
259 if ((n = imsg_get(ibuf, &imsg)) == -1)
260 fatal("%s: imsg_get", __func__);
261 if (n == 0) /* No more messages. */
264 switch (imsg.hdr.type) {
265 case GOTD_IMSG_AUTHENTICATE:
266 err = recv_authreq(&imsg, iev);
268 log_warnx("%s", err->msg);
271 log_debug("unexpected imsg %d", imsg.hdr.type);
279 gotd_imsg_event_add(iev);
281 /* This pipe is dead. Remove its event handler */
283 event_loopexit(NULL);
288 auth_main(const char *title, struct gotd_repolist *repos,
289 const char *repo_path)
291 struct gotd_repo *repo = NULL;
292 struct gotd_imsgev iev;
293 struct event evsigint, evsigterm, evsighup, evsigusr1;
295 gotd_auth.title = title;
296 gotd_auth.pid = getpid();
297 TAILQ_FOREACH(repo, repos, entry) {
298 if (got_path_cmp(repo->path, repo_path,
299 strlen(repo->path), strlen(repo_path)) == 0)
303 fatalx("repository %s not found in config", repo_path);
304 gotd_auth.repo = repo;
306 signal_set(&evsigint, SIGINT, auth_sighdlr, NULL);
307 signal_set(&evsigterm, SIGTERM, auth_sighdlr, NULL);
308 signal_set(&evsighup, SIGHUP, auth_sighdlr, NULL);
309 signal_set(&evsigusr1, SIGUSR1, auth_sighdlr, NULL);
310 signal(SIGPIPE, SIG_IGN);
312 signal_add(&evsigint, NULL);
313 signal_add(&evsigterm, NULL);
314 signal_add(&evsighup, NULL);
315 signal_add(&evsigusr1, NULL);
317 imsg_init(&iev.ibuf, GOTD_FILENO_MSG_PIPE);
318 iev.handler = auth_dispatch;
319 iev.events = EV_READ;
320 iev.handler_arg = NULL;
321 event_set(&iev.ev, iev.ibuf.fd, EV_READ, auth_dispatch, &iev);
322 if (event_add(&iev.ev, NULL) == -1)
333 log_debug("%s: shutting down", gotd_auth.title);