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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
8c6db833 LP |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
8c6db833 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
8c6db833 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
8c6db833 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <fcntl.h> | |
24 | #include <sys/file.h> | |
25 | #include <pwd.h> | |
a838e6a1 | 26 | #include <endian.h> |
ac123445 | 27 | #include <sys/capability.h> |
8c6db833 LP |
28 | |
29 | #include <security/pam_modules.h> | |
30 | #include <security/_pam_macros.h> | |
31 | #include <security/pam_modutil.h> | |
32 | #include <security/pam_ext.h> | |
33 | #include <security/pam_misc.h> | |
34 | ||
8c6db833 | 35 | #include "util.h" |
d7832d2c | 36 | #include "audit.h" |
8c6db833 | 37 | #include "macro.h" |
74fe1fe3 | 38 | #include "strv.h" |
ffcfcb6b | 39 | #include "bus-util.h" |
98a28fef | 40 | #include "def.h" |
4d6d6518 | 41 | #include "socket-util.h" |
a5c32cff | 42 | #include "fileio.h" |
8159d91a | 43 | #include "bus-error.h" |
8c6db833 LP |
44 | |
45 | static int parse_argv(pam_handle_t *handle, | |
46 | int argc, const char **argv, | |
485507b8 | 47 | const char **class, |
0e318cad | 48 | bool *debug) { |
8c6db833 LP |
49 | |
50 | unsigned i; | |
51 | ||
52 | assert(argc >= 0); | |
53 | assert(argc == 0 || argv); | |
54 | ||
05a049cc | 55 | for (i = 0; i < (unsigned) argc; i++) |
fb6becb4 | 56 | if (startswith(argv[i], "class=")) { |
485507b8 MM |
57 | if (class) |
58 | *class = argv[i] + 6; | |
59 | ||
05a049cc ZJS |
60 | } else if (streq(argv[i], "debug")) { |
61 | if (debug) | |
62 | *debug = true; | |
fb6becb4 | 63 | |
05a049cc ZJS |
64 | } else if (startswith(argv[i], "debug=")) { |
65 | int k; | |
0e318cad | 66 | |
05a049cc ZJS |
67 | k = parse_boolean(argv[i] + 6); |
68 | if (k < 0) | |
69 | pam_syslog(handle, LOG_WARNING, "Failed to parse debug= argument, ignoring."); | |
70 | else if (debug) | |
0e318cad MS |
71 | *debug = k; |
72 | ||
05a049cc | 73 | } else |
fb6becb4 | 74 | pam_syslog(handle, LOG_WARNING, "Unknown parameter '%s', ignoring", argv[i]); |
8c6db833 | 75 | |
8c6db833 LP |
76 | return 0; |
77 | } | |
78 | ||
8c6db833 LP |
79 | static int get_user_data( |
80 | pam_handle_t *handle, | |
81 | const char **ret_username, | |
82 | struct passwd **ret_pw) { | |
83 | ||
d90b9d27 LP |
84 | const char *username = NULL; |
85 | struct passwd *pw = NULL; | |
87d2c1ff | 86 | uid_t uid; |
8c6db833 LP |
87 | int r; |
88 | ||
89 | assert(handle); | |
90 | assert(ret_username); | |
91 | assert(ret_pw); | |
92 | ||
87d2c1ff LP |
93 | r = audit_loginuid_from_pid(0, &uid); |
94 | if (r >= 0) | |
95 | pw = pam_modutil_getpwuid(handle, uid); | |
96 | else { | |
97 | r = pam_get_user(handle, &username, NULL); | |
98 | if (r != PAM_SUCCESS) { | |
d90b9d27 LP |
99 | pam_syslog(handle, LOG_ERR, "Failed to get user name."); |
100 | return r; | |
101 | } | |
102 | ||
87d2c1ff | 103 | if (isempty(username)) { |
d90b9d27 LP |
104 | pam_syslog(handle, LOG_ERR, "User name not valid."); |
105 | return PAM_AUTH_ERR; | |
106 | } | |
107 | ||
108 | pw = pam_modutil_getpwnam(handle, username); | |
8c6db833 LP |
109 | } |
110 | ||
d90b9d27 | 111 | if (!pw) { |
8c6db833 LP |
112 | pam_syslog(handle, LOG_ERR, "Failed to get user data."); |
113 | return PAM_USER_UNKNOWN; | |
114 | } | |
115 | ||
116 | *ret_pw = pw; | |
d90b9d27 | 117 | *ret_username = username ? username : pw->pw_name; |
8c6db833 LP |
118 | |
119 | return PAM_SUCCESS; | |
120 | } | |
121 | ||
4d6d6518 | 122 | static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) { |
7fd1b19b | 123 | _cleanup_free_ char *p = NULL; |
4d6d6518 | 124 | int r; |
7fd1b19b | 125 | _cleanup_close_ int fd = -1; |
b92bea5d ZJS |
126 | union sockaddr_union sa = { |
127 | .un.sun_family = AF_UNIX, | |
128 | }; | |
4d6d6518 LP |
129 | struct ucred ucred; |
130 | socklen_t l; | |
7fd1b19b | 131 | _cleanup_free_ char *tty = NULL; |
4d6d6518 LP |
132 | int v; |
133 | ||
134 | assert(display); | |
4d6d6518 LP |
135 | assert(vtnr); |
136 | ||
137 | /* We deduce the X11 socket from the display name, then use | |
138 | * SO_PEERCRED to determine the X11 server process, ask for | |
139 | * the controlling tty of that and if it's a VC then we know | |
140 | * the seat and the virtual terminal. Sounds ugly, is only | |
141 | * semi-ugly. */ | |
142 | ||
143 | r = socket_from_display(display, &p); | |
144 | if (r < 0) | |
145 | return r; | |
b92bea5d | 146 | strncpy(sa.un.sun_path, p, sizeof(sa.un.sun_path)-1); |
4d6d6518 LP |
147 | |
148 | fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0); | |
b92bea5d | 149 | if (fd < 0) |
4d6d6518 | 150 | return -errno; |
4d6d6518 | 151 | |
b92bea5d | 152 | if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) |
4d6d6518 | 153 | return -errno; |
4d6d6518 LP |
154 | |
155 | l = sizeof(ucred); | |
156 | r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l); | |
4d6d6518 LP |
157 | if (r < 0) |
158 | return -errno; | |
159 | ||
160 | r = get_ctty(ucred.pid, NULL, &tty); | |
161 | if (r < 0) | |
162 | return r; | |
163 | ||
164 | v = vtnr_from_tty(tty); | |
4d6d6518 LP |
165 | if (v < 0) |
166 | return v; | |
167 | else if (v == 0) | |
168 | return -ENOENT; | |
169 | ||
fc7985ed LP |
170 | if (seat) |
171 | *seat = "seat0"; | |
4d6d6518 LP |
172 | *vtnr = (uint32_t) v; |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
98a28fef | 177 | _public_ PAM_EXTERN int pam_sm_open_session( |
8c6db833 LP |
178 | pam_handle_t *handle, |
179 | int flags, | |
180 | int argc, const char **argv) { | |
181 | ||
ffcfcb6b ZJS |
182 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
183 | _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; | |
d1529c9e LP |
184 | const char |
185 | *username, *id, *object_path, *runtime_path, | |
186 | *service = NULL, | |
187 | *tty = NULL, *display = NULL, | |
188 | *remote_user = NULL, *remote_host = NULL, | |
189 | *seat = NULL, | |
190 | *type = NULL, *class = NULL, | |
191 | *class_pam = NULL, *cvtnr = NULL; | |
192 | _cleanup_bus_unref_ sd_bus *bus = NULL; | |
193 | int session_fd = -1, existing, r; | |
194 | uint32_t uid, pid, vtnr = 0; | |
195 | bool debug = false, remote; | |
196 | struct passwd *pw; | |
8c6db833 | 197 | |
ffcfcb6b | 198 | assert(handle); |
98a28fef | 199 | |
970edce6 ZJS |
200 | if (debug) |
201 | pam_syslog(handle, LOG_INFO, "pam-systemd initializing"); | |
98a28fef | 202 | |
79d860fe MP |
203 | /* Make this a NOP on non-logind systems */ |
204 | if (!logind_running()) | |
8c6db833 LP |
205 | return PAM_SUCCESS; |
206 | ||
e9fbc77c LP |
207 | if (parse_argv(handle, |
208 | argc, argv, | |
fb6becb4 | 209 | &class_pam, |
5a330cda ZJS |
210 | &debug) < 0) |
211 | return PAM_SESSION_ERR; | |
74fe1fe3 | 212 | |
98a28fef | 213 | r = get_user_data(handle, &username, &pw); |
5a330cda ZJS |
214 | if (r != PAM_SUCCESS) { |
215 | pam_syslog(handle, LOG_ERR, "Failed to get user data."); | |
216 | return r; | |
217 | } | |
8c6db833 | 218 | |
30b2c336 LP |
219 | /* Make sure we don't enter a loop by talking to |
220 | * systemd-logind when it is actually waiting for the | |
221 | * background to finish start-up. If the service is | |
5c390a4a | 222 | * "systemd-user" we simply set XDG_RUNTIME_DIR and |
30b2c336 LP |
223 | * leave. */ |
224 | ||
225 | pam_get_item(handle, PAM_SERVICE, (const void**) &service); | |
5c390a4a | 226 | if (streq_ptr(service, "systemd-user")) { |
05a049cc | 227 | _cleanup_free_ char *p = NULL, *rt = NULL; |
30b2c336 | 228 | |
ffcfcb6b ZJS |
229 | if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) pw->pw_uid) < 0) |
230 | return PAM_BUF_ERR; | |
30b2c336 LP |
231 | |
232 | r = parse_env_file(p, NEWLINE, | |
233 | "RUNTIME", &rt, | |
234 | NULL); | |
ffcfcb6b ZJS |
235 | if (r < 0 && r != -ENOENT) |
236 | return PAM_SESSION_ERR; | |
30b2c336 LP |
237 | |
238 | if (rt) { | |
239 | r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0); | |
30b2c336 LP |
240 | if (r != PAM_SUCCESS) { |
241 | pam_syslog(handle, LOG_ERR, "Failed to set runtime dir."); | |
ffcfcb6b | 242 | return r; |
30b2c336 LP |
243 | } |
244 | } | |
245 | ||
ffcfcb6b | 246 | return PAM_SUCCESS; |
8c6db833 LP |
247 | } |
248 | ||
ffcfcb6b | 249 | /* Otherwise, we ask logind to create a session for us */ |
8c6db833 | 250 | |
98a28fef LP |
251 | uid = pw->pw_uid; |
252 | pid = getpid(); | |
253 | ||
98a28fef LP |
254 | pam_get_item(handle, PAM_XDISPLAY, (const void**) &display); |
255 | pam_get_item(handle, PAM_TTY, (const void**) &tty); | |
256 | pam_get_item(handle, PAM_RUSER, (const void**) &remote_user); | |
257 | pam_get_item(handle, PAM_RHOST, (const void**) &remote_host); | |
a8573ccc | 258 | |
bbc73283 | 259 | seat = pam_getenv(handle, "XDG_SEAT"); |
a8573ccc LP |
260 | if (isempty(seat)) |
261 | seat = getenv("XDG_SEAT"); | |
262 | ||
bbc73283 | 263 | cvtnr = pam_getenv(handle, "XDG_VTNR"); |
a8573ccc LP |
264 | if (isempty(cvtnr)) |
265 | cvtnr = getenv("XDG_VTNR"); | |
98a28fef | 266 | |
ed18b08b LP |
267 | service = strempty(service); |
268 | tty = strempty(tty); | |
269 | display = strempty(display); | |
270 | remote_user = strempty(remote_user); | |
271 | remote_host = strempty(remote_host); | |
272 | seat = strempty(seat); | |
98a28fef | 273 | |
ee8545b0 | 274 | if (strchr(tty, ':')) { |
e2acb67b LP |
275 | /* A tty with a colon is usually an X11 display, |
276 | * placed there to show up in utmp. We rearrange | |
277 | * things and don't pretend that an X display was a | |
278 | * tty. */ | |
ee8545b0 LP |
279 | |
280 | if (isempty(display)) | |
281 | display = tty; | |
cd58752a | 282 | tty = ""; |
1a4459d6 | 283 | } else if (streq(tty, "cron")) { |
0ad1271f LP |
284 | /* cron has been setting PAM_TTY to "cron" for a very |
285 | * long time and it probably shouldn't stop doing that | |
286 | * for compatibility reasons. */ | |
1a4459d6 | 287 | tty = ""; |
0ad1271f LP |
288 | type = "unspecified"; |
289 | } else if (streq(tty, "ssh")) { | |
290 | /* ssh has been setting PAM_TTY to "ssh" for a very | |
291 | * long time and probably shouldn't stop doing that | |
292 | * for compatibility reasons. */ | |
293 | tty = ""; | |
294 | type ="tty"; | |
ee8545b0 LP |
295 | } |
296 | ||
8e7705e5 | 297 | /* If this fails vtnr will be 0, that's intended */ |
4d6d6518 LP |
298 | if (!isempty(cvtnr)) |
299 | safe_atou32(cvtnr, &vtnr); | |
300 | ||
fc7985ed LP |
301 | if (!isempty(display) && vtnr <= 0) { |
302 | if (isempty(seat)) | |
6ef25fb6 | 303 | get_seat_from_display(display, &seat, &vtnr); |
fc7985ed | 304 | else if (streq(seat, "seat0")) |
6ef25fb6 | 305 | get_seat_from_display(display, NULL, &vtnr); |
fc7985ed | 306 | } |
4d6d6518 | 307 | |
0ad1271f LP |
308 | if (!type) |
309 | type = !isempty(display) ? "x11" : | |
310 | !isempty(tty) ? "tty" : "unspecified"; | |
98a28fef | 311 | |
55efac6c | 312 | class = pam_getenv(handle, "XDG_SESSION_CLASS"); |
a8573ccc LP |
313 | if (isempty(class)) |
314 | class = getenv("XDG_SESSION_CLASS"); | |
485507b8 MM |
315 | if (isempty(class)) |
316 | class = class_pam; | |
55efac6c | 317 | if (isempty(class)) |
e2acb67b | 318 | class = streq(type, "unspecified") ? "background" : "user"; |
55efac6c LP |
319 | |
320 | remote = !isempty(remote_host) && | |
321 | !streq(remote_host, "localhost") && | |
322 | !streq(remote_host, "localhost.localdomain"); | |
98a28fef | 323 | |
4d49b48c | 324 | /* Talk to logind over the message bus */ |
5a330cda | 325 | |
ffcfcb6b ZJS |
326 | r = sd_bus_open_system(&bus); |
327 | if (r < 0) { | |
328 | pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror(-r)); | |
329 | return PAM_SESSION_ERR; | |
cc377381 LP |
330 | } |
331 | ||
ce959314 MS |
332 | if (debug) |
333 | pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: " | |
f904bdf2 CG |
334 | "uid=%u pid=%u service=%s type=%s class=%s seat=%s vtnr=%u tty=%s display=%s remote=%s remote_user=%s remote_host=%s", |
335 | uid, pid, service, type, class, seat, vtnr, tty, display, yes_no(remote), remote_user, remote_host); | |
ce959314 | 336 | |
ffcfcb6b ZJS |
337 | r = sd_bus_call_method(bus, |
338 | "org.freedesktop.login1", | |
339 | "/org/freedesktop/login1", | |
340 | "org.freedesktop.login1.Manager", | |
341 | "CreateSession", | |
342 | &error, | |
343 | &reply, | |
344 | "uussssussbssa(sv)", | |
345 | uid, | |
346 | pid, | |
347 | service, | |
348 | type, | |
349 | class, | |
350 | seat, | |
351 | vtnr, | |
352 | tty, | |
353 | display, | |
354 | remote, | |
355 | remote_user, | |
356 | remote_host, | |
357 | 0); | |
358 | if (r < 0) { | |
8159d91a | 359 | pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error, r)); |
ffcfcb6b | 360 | return PAM_SYSTEM_ERR; |
98a28fef | 361 | } |
74fe1fe3 | 362 | |
ffcfcb6b ZJS |
363 | r = sd_bus_message_read(reply, |
364 | "soshsub", | |
365 | &id, | |
366 | &object_path, | |
367 | &runtime_path, | |
368 | &session_fd, | |
369 | &seat, | |
370 | &vtnr, | |
371 | &existing); | |
372 | if (r < 0) { | |
373 | pam_syslog(handle, LOG_ERR, "Failed to parse message: %s", strerror(-r)); | |
5a330cda | 374 | return PAM_SESSION_ERR; |
98a28fef | 375 | } |
74fe1fe3 | 376 | |
ce959314 MS |
377 | if (debug) |
378 | pam_syslog(handle, LOG_DEBUG, "Reply from logind: " | |
379 | "id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u", | |
380 | id, object_path, runtime_path, session_fd, seat, vtnr); | |
381 | ||
98a28fef LP |
382 | r = pam_misc_setenv(handle, "XDG_SESSION_ID", id, 0); |
383 | if (r != PAM_SUCCESS) { | |
384 | pam_syslog(handle, LOG_ERR, "Failed to set session id."); | |
5a330cda | 385 | return r; |
8c6db833 LP |
386 | } |
387 | ||
98a28fef LP |
388 | r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", runtime_path, 0); |
389 | if (r != PAM_SUCCESS) { | |
390 | pam_syslog(handle, LOG_ERR, "Failed to set runtime dir."); | |
5a330cda | 391 | return r; |
98a28fef | 392 | } |
8c6db833 | 393 | |
bbc73283 LP |
394 | if (!isempty(seat)) { |
395 | r = pam_misc_setenv(handle, "XDG_SEAT", seat, 0); | |
396 | if (r != PAM_SUCCESS) { | |
397 | pam_syslog(handle, LOG_ERR, "Failed to set seat."); | |
5a330cda | 398 | return r; |
bbc73283 LP |
399 | } |
400 | } | |
401 | ||
402 | if (vtnr > 0) { | |
29d230f6 | 403 | char buf[DECIMAL_STR_MAX(vtnr)]; |
bbc73283 | 404 | snprintf(buf, sizeof(buf), "%u", vtnr); |
bbc73283 LP |
405 | |
406 | r = pam_misc_setenv(handle, "XDG_VTNR", buf, 0); | |
407 | if (r != PAM_SUCCESS) { | |
408 | pam_syslog(handle, LOG_ERR, "Failed to set virtual terminal number."); | |
5a330cda | 409 | return r; |
bbc73283 LP |
410 | } |
411 | } | |
412 | ||
77085881 LP |
413 | r = pam_set_data(handle, "systemd.existing", INT_TO_PTR(!!existing), NULL); |
414 | if (r != PAM_SUCCESS) { | |
415 | pam_syslog(handle, LOG_ERR, "Failed to install existing flag."); | |
5a330cda | 416 | return r; |
77085881 LP |
417 | } |
418 | ||
21c390cc | 419 | if (session_fd >= 0) { |
5a330cda ZJS |
420 | session_fd = dup(session_fd); |
421 | if (session_fd < 0) { | |
422 | pam_syslog(handle, LOG_ERR, "Failed to dup session fd: %m"); | |
423 | return PAM_SESSION_ERR; | |
424 | } | |
425 | ||
21c390cc LP |
426 | r = pam_set_data(handle, "systemd.session-fd", INT_TO_PTR(session_fd+1), NULL); |
427 | if (r != PAM_SUCCESS) { | |
428 | pam_syslog(handle, LOG_ERR, "Failed to install session fd."); | |
5a330cda ZJS |
429 | close_nointr_nofail(session_fd); |
430 | return r; | |
21c390cc | 431 | } |
98a28fef | 432 | } |
8c6db833 | 433 | |
ffcfcb6b | 434 | return PAM_SUCCESS; |
98a28fef | 435 | } |
8c6db833 | 436 | |
98a28fef LP |
437 | _public_ PAM_EXTERN int pam_sm_close_session( |
438 | pam_handle_t *handle, | |
439 | int flags, | |
440 | int argc, const char **argv) { | |
8c6db833 | 441 | |
29d230f6 | 442 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
29d230f6 | 443 | _cleanup_bus_unref_ sd_bus *bus = NULL; |
77085881 | 444 | const void *p = NULL, *existing = NULL; |
75c8e3cf | 445 | const char *id; |
75c8e3cf | 446 | int r; |
8c6db833 | 447 | |
ffcfcb6b | 448 | assert(handle); |
75c8e3cf | 449 | |
77085881 LP |
450 | /* Only release session if it wasn't pre-existing when we |
451 | * tried to create it */ | |
452 | pam_get_data(handle, "systemd.existing", &existing); | |
453 | ||
75c8e3cf | 454 | id = pam_getenv(handle, "XDG_SESSION_ID"); |
77085881 | 455 | if (id && !existing) { |
75c8e3cf LP |
456 | |
457 | /* Before we go and close the FIFO we need to tell | |
458 | * logind that this is a clean session shutdown, so | |
459 | * that it doesn't just go and slaughter us | |
460 | * immediately after closing the fd */ | |
461 | ||
ffcfcb6b ZJS |
462 | r = sd_bus_open_system(&bus); |
463 | if (r < 0) { | |
464 | pam_syslog(handle, LOG_ERR, | |
465 | "Failed to connect to system bus: %s", strerror(-r)); | |
75c8e3cf LP |
466 | r = PAM_SESSION_ERR; |
467 | goto finish; | |
468 | } | |
469 | ||
ffcfcb6b ZJS |
470 | r = sd_bus_call_method(bus, |
471 | "org.freedesktop.login1", | |
472 | "/org/freedesktop/login1", | |
473 | "org.freedesktop.login1.Manager", | |
474 | "ReleaseSession", | |
475 | &error, | |
476 | NULL, | |
477 | "s", | |
478 | id); | |
479 | if (r < 0) { | |
480 | pam_syslog(handle, LOG_ERR, | |
8159d91a | 481 | "Failed to release session: %s", bus_error_message(&error, r)); |
74fe1fe3 | 482 | |
75c8e3cf LP |
483 | r = PAM_SESSION_ERR; |
484 | goto finish; | |
485 | } | |
486 | } | |
487 | ||
488 | r = PAM_SUCCESS; | |
489 | ||
490 | finish: | |
491 | pam_get_data(handle, "systemd.session-fd", &p); | |
98a28fef LP |
492 | if (p) |
493 | close_nointr(PTR_TO_INT(p) - 1); | |
1f73f0f1 | 494 | |
75c8e3cf | 495 | return r; |
8c6db833 | 496 | } |