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>
36 #include "got_error.h"
43 static struct gotd_auth {
46 struct gotd_repo *repo;
49 static void auth_shutdown(void);
52 auth_sighdlr(int sig, short event, void *arg)
55 * Normal signal handler rules don't apply because libevent
70 fatalx("unexpected signal");
75 uidcheck(const char *s, uid_t desired)
79 if (gotd_parseuid(s, &uid) != 0)
87 parsegid(const char *s, gid_t *gid)
92 if ((gr = getgrnam(s)) != NULL) {
98 *gid = strtonum(s, 0, GID_MAX - 1, &errstr);
105 match_identifier(const char *identifier, gid_t *groups, int ngroups,
106 uid_t euid, gid_t egid)
110 if (identifier[0] == ':') {
112 if (parsegid(identifier + 1, &rgid) == -1)
116 for (i = 0; i < ngroups; i++) {
117 if (rgid == groups[i])
122 } else if (uidcheck(identifier, euid) != 0)
128 static const struct got_error *
129 auth_check(struct gotd_access_rule_list *rules, const char *repo_name,
130 uid_t euid, gid_t egid, int required_auth)
132 struct gotd_access_rule *rule;
133 enum gotd_access access = GOTD_ACCESS_DENIED;
135 gid_t groups[NGROUPS_MAX];
136 int ngroups = NGROUPS_MAX;
141 return got_error_from_errno("getpwuid");
143 return got_error_set_errno(EACCES, repo_name);
146 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups) == -1)
147 log_warnx("group membership list truncated");
149 STAILQ_FOREACH(rule, rules, entry) {
150 if (!match_identifier(rule->identifier, groups, ngroups,
154 access = rule->access;
155 if (rule->access == GOTD_ACCESS_PERMITTED &&
156 (rule->authorization & required_auth) != required_auth)
157 access = GOTD_ACCESS_DENIED;
160 if (access == GOTD_ACCESS_DENIED)
161 return got_error_set_errno(EACCES, repo_name);
163 if (access == GOTD_ACCESS_PERMITTED)
166 /* should not happen, this would be a bug */
167 return got_error_msg(GOT_ERR_NOT_IMPL, "bad access rule");
170 static const struct got_error *
171 recv_authreq(struct imsg *imsg, struct gotd_imsgev *iev)
173 const struct got_error *err;
174 struct imsgbuf *ibuf = &iev->ibuf;
175 struct gotd_imsg_auth iauth;
180 log_debug("authentication request received");
182 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
183 if (datalen != sizeof(iauth))
184 return got_error(GOT_ERR_PRIVSEP_LEN);
186 memcpy(&iauth, imsg->data, datalen);
189 return got_error(GOT_ERR_PRIVSEP_NO_FD);
191 if (getpeereid(imsg->fd, &euid, &egid) == -1)
192 return got_error_from_errno("getpeerid");
194 if (iauth.euid != euid)
195 return got_error(GOT_ERR_UID);
196 if (iauth.egid != egid)
197 return got_error(GOT_ERR_GID);
199 log_debug("authenticating uid %d gid %d", euid, egid);
201 err = auth_check(&gotd_auth.repo->rules, gotd_auth.repo->name,
202 iauth.euid, iauth.egid, iauth.required_auth);
204 gotd_imsg_send_error(ibuf, PROC_AUTH, iauth.client_id, err);
208 if (gotd_imsg_compose_event(iev, GOTD_IMSG_ACCESS_GRANTED,
209 PROC_AUTH, -1, NULL, 0) == -1)
210 return got_error_from_errno("imsg compose ACCESS_GRANTED");
216 auth_dispatch(int fd, short event, void *arg)
218 const struct got_error *err = NULL;
219 struct gotd_imsgev *iev = arg;
220 struct imsgbuf *ibuf = &iev->ibuf;
225 if (event & EV_READ) {
226 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
227 fatal("imsg_read error");
228 if (n == 0) /* Connection closed. */
232 if (event & EV_WRITE) {
233 n = msgbuf_write(&ibuf->w);
234 if (n == -1 && errno != EAGAIN)
235 fatal("msgbuf_write");
236 if (n == 0) /* Connection closed. */
241 if ((n = imsg_get(ibuf, &imsg)) == -1)
242 fatal("%s: imsg_get", __func__);
243 if (n == 0) /* No more messages. */
246 switch (imsg.hdr.type) {
247 case GOTD_IMSG_AUTHENTICATE:
248 err = recv_authreq(&imsg, iev);
250 log_warnx("%s", err->msg);
253 log_debug("unexpected imsg %d", imsg.hdr.type);
261 gotd_imsg_event_add(iev);
263 /* This pipe is dead. Remove its event handler */
265 event_loopexit(NULL);
270 auth_main(const char *title, struct gotd_repolist *repos,
271 const char *repo_path)
273 struct gotd_repo *repo = NULL;
274 struct gotd_imsgev iev;
275 struct event evsigint, evsigterm, evsighup, evsigusr1;
277 gotd_auth.title = title;
278 gotd_auth.pid = getpid();
279 TAILQ_FOREACH(repo, repos, entry) {
280 if (got_path_cmp(repo->path, repo_path,
281 strlen(repo->path), strlen(repo_path)) == 0)
285 fatalx("repository %s not found in config", repo_path);
286 gotd_auth.repo = repo;
288 signal_set(&evsigint, SIGINT, auth_sighdlr, NULL);
289 signal_set(&evsigterm, SIGTERM, auth_sighdlr, NULL);
290 signal_set(&evsighup, SIGHUP, auth_sighdlr, NULL);
291 signal_set(&evsigusr1, SIGUSR1, auth_sighdlr, NULL);
292 signal(SIGPIPE, SIG_IGN);
294 signal_add(&evsigint, NULL);
295 signal_add(&evsigterm, NULL);
296 signal_add(&evsighup, NULL);
297 signal_add(&evsigusr1, NULL);
299 imsg_init(&iev.ibuf, GOTD_FILENO_MSG_PIPE);
300 iev.handler = auth_dispatch;
301 iev.events = EV_READ;
302 iev.handler_arg = NULL;
303 event_set(&iev.ev, iev.ibuf.fd, EV_READ, auth_dispatch, &iev);
304 if (event_add(&iev.ev, NULL) == -1)
315 log_debug("shutting down");