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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 | 44 | |
baae0358 LP |
45 | static int parse_argv( |
46 | pam_handle_t *handle, | |
47 | int argc, const char **argv, | |
48 | const char **class, | |
49ebd11f | 49 | const char **type, |
baae0358 | 50 | bool *debug) { |
8c6db833 LP |
51 | |
52 | unsigned i; | |
53 | ||
54 | assert(argc >= 0); | |
55 | assert(argc == 0 || argv); | |
56 | ||
49ebd11f | 57 | for (i = 0; i < (unsigned) argc; i++) { |
fb6becb4 | 58 | if (startswith(argv[i], "class=")) { |
485507b8 MM |
59 | if (class) |
60 | *class = argv[i] + 6; | |
61 | ||
49ebd11f LP |
62 | } else if (startswith(argv[i], "type=")) { |
63 | if (type) | |
64 | *type = argv[i] + 5; | |
65 | ||
05a049cc ZJS |
66 | } else if (streq(argv[i], "debug")) { |
67 | if (debug) | |
68 | *debug = true; | |
fb6becb4 | 69 | |
05a049cc ZJS |
70 | } else if (startswith(argv[i], "debug=")) { |
71 | int k; | |
0e318cad | 72 | |
05a049cc ZJS |
73 | k = parse_boolean(argv[i] + 6); |
74 | if (k < 0) | |
75 | pam_syslog(handle, LOG_WARNING, "Failed to parse debug= argument, ignoring."); | |
76 | else if (debug) | |
0e318cad MS |
77 | *debug = k; |
78 | ||
05a049cc | 79 | } else |
fb6becb4 | 80 | pam_syslog(handle, LOG_WARNING, "Unknown parameter '%s', ignoring", argv[i]); |
49ebd11f | 81 | } |
8c6db833 | 82 | |
8c6db833 LP |
83 | return 0; |
84 | } | |
85 | ||
8c6db833 LP |
86 | static int get_user_data( |
87 | pam_handle_t *handle, | |
88 | const char **ret_username, | |
89 | struct passwd **ret_pw) { | |
90 | ||
d90b9d27 LP |
91 | const char *username = NULL; |
92 | struct passwd *pw = NULL; | |
8c6db833 LP |
93 | int r; |
94 | ||
95 | assert(handle); | |
96 | assert(ret_username); | |
97 | assert(ret_pw); | |
98 | ||
baae0358 LP |
99 | r = pam_get_user(handle, &username, NULL); |
100 | if (r != PAM_SUCCESS) { | |
101 | pam_syslog(handle, LOG_ERR, "Failed to get user name."); | |
102 | return r; | |
103 | } | |
d90b9d27 | 104 | |
baae0358 LP |
105 | if (isempty(username)) { |
106 | pam_syslog(handle, LOG_ERR, "User name not valid."); | |
107 | return PAM_AUTH_ERR; | |
8c6db833 LP |
108 | } |
109 | ||
baae0358 | 110 | pw = pam_modutil_getpwnam(handle, username); |
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; | |
8e24a4f8 | 117 | *ret_username = username; |
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) { |
b92bea5d ZJS |
123 | union sockaddr_union sa = { |
124 | .un.sun_family = AF_UNIX, | |
125 | }; | |
baae0358 LP |
126 | _cleanup_free_ char *p = NULL, *tty = NULL; |
127 | _cleanup_close_ int fd = -1; | |
4d6d6518 | 128 | struct ucred ucred; |
baae0358 | 129 | int v, r; |
4d6d6518 LP |
130 | |
131 | assert(display); | |
4d6d6518 LP |
132 | assert(vtnr); |
133 | ||
134 | /* We deduce the X11 socket from the display name, then use | |
135 | * SO_PEERCRED to determine the X11 server process, ask for | |
136 | * the controlling tty of that and if it's a VC then we know | |
137 | * the seat and the virtual terminal. Sounds ugly, is only | |
138 | * semi-ugly. */ | |
139 | ||
140 | r = socket_from_display(display, &p); | |
141 | if (r < 0) | |
142 | return r; | |
b92bea5d | 143 | strncpy(sa.un.sun_path, p, sizeof(sa.un.sun_path)-1); |
4d6d6518 LP |
144 | |
145 | fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0); | |
b92bea5d | 146 | if (fd < 0) |
4d6d6518 | 147 | return -errno; |
4d6d6518 | 148 | |
b92bea5d | 149 | if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) |
4d6d6518 | 150 | return -errno; |
4d6d6518 | 151 | |
eff05270 | 152 | r = getpeercred(fd, &ucred); |
4d6d6518 | 153 | if (r < 0) |
eff05270 | 154 | return r; |
4d6d6518 LP |
155 | |
156 | r = get_ctty(ucred.pid, NULL, &tty); | |
157 | if (r < 0) | |
158 | return r; | |
159 | ||
160 | v = vtnr_from_tty(tty); | |
4d6d6518 LP |
161 | if (v < 0) |
162 | return v; | |
163 | else if (v == 0) | |
164 | return -ENOENT; | |
165 | ||
fc7985ed LP |
166 | if (seat) |
167 | *seat = "seat0"; | |
4d6d6518 LP |
168 | *vtnr = (uint32_t) v; |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
8b255ecd KS |
173 | static int export_legacy_dbus_address( |
174 | pam_handle_t *handle, | |
175 | uid_t uid, | |
176 | const char *runtime) { | |
177 | ||
5eecd85f | 178 | #ifdef ENABLE_KDBUS |
8b255ecd KS |
179 | _cleanup_free_ char *s = NULL; |
180 | int r; | |
181 | ||
8042e377 | 182 | /* skip export if kdbus is not active */ |
63cc4c31 | 183 | if (access("/sys/fs/kdbus", F_OK) < 0) |
8042e377 KS |
184 | return PAM_SUCCESS; |
185 | ||
e3afaf6b | 186 | if (asprintf(&s, KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT, uid, runtime) < 0) { |
8b255ecd KS |
187 | pam_syslog(handle, LOG_ERR, "Failed to set bus variable."); |
188 | return PAM_BUF_ERR; | |
189 | } | |
190 | ||
191 | r = pam_misc_setenv(handle, "DBUS_SESSION_BUS_ADDRESS", s, 0); | |
192 | if (r != PAM_SUCCESS) { | |
193 | pam_syslog(handle, LOG_ERR, "Failed to set bus variable."); | |
194 | return r; | |
195 | } | |
5eecd85f | 196 | #endif |
8b255ecd KS |
197 | return PAM_SUCCESS; |
198 | } | |
199 | ||
98a28fef | 200 | _public_ PAM_EXTERN int pam_sm_open_session( |
8c6db833 LP |
201 | pam_handle_t *handle, |
202 | int flags, | |
203 | int argc, const char **argv) { | |
204 | ||
ffcfcb6b ZJS |
205 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
206 | _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; | |
d1529c9e LP |
207 | const char |
208 | *username, *id, *object_path, *runtime_path, | |
209 | *service = NULL, | |
210 | *tty = NULL, *display = NULL, | |
211 | *remote_user = NULL, *remote_host = NULL, | |
212 | *seat = NULL, | |
213 | *type = NULL, *class = NULL, | |
a4cd87e9 | 214 | *class_pam = NULL, *type_pam = NULL, *cvtnr = NULL, *desktop = NULL; |
24996861 | 215 | _cleanup_bus_close_unref_ sd_bus *bus = NULL; |
d1529c9e | 216 | int session_fd = -1, existing, r; |
d1529c9e LP |
217 | bool debug = false, remote; |
218 | struct passwd *pw; | |
baae0358 LP |
219 | uint32_t vtnr = 0; |
220 | uid_t original_uid; | |
8c6db833 | 221 | |
ffcfcb6b | 222 | assert(handle); |
98a28fef | 223 | |
79d860fe MP |
224 | /* Make this a NOP on non-logind systems */ |
225 | if (!logind_running()) | |
8c6db833 LP |
226 | return PAM_SUCCESS; |
227 | ||
e9fbc77c LP |
228 | if (parse_argv(handle, |
229 | argc, argv, | |
fb6becb4 | 230 | &class_pam, |
49ebd11f | 231 | &type_pam, |
5a330cda ZJS |
232 | &debug) < 0) |
233 | return PAM_SESSION_ERR; | |
74fe1fe3 | 234 | |
baae0358 | 235 | if (debug) |
3831838a | 236 | pam_syslog(handle, LOG_DEBUG, "pam-systemd initializing"); |
baae0358 | 237 | |
98a28fef | 238 | r = get_user_data(handle, &username, &pw); |
5a330cda ZJS |
239 | if (r != PAM_SUCCESS) { |
240 | pam_syslog(handle, LOG_ERR, "Failed to get user data."); | |
241 | return r; | |
242 | } | |
8c6db833 | 243 | |
30b2c336 LP |
244 | /* Make sure we don't enter a loop by talking to |
245 | * systemd-logind when it is actually waiting for the | |
246 | * background to finish start-up. If the service is | |
5c390a4a | 247 | * "systemd-user" we simply set XDG_RUNTIME_DIR and |
30b2c336 LP |
248 | * leave. */ |
249 | ||
250 | pam_get_item(handle, PAM_SERVICE, (const void**) &service); | |
5c390a4a | 251 | if (streq_ptr(service, "systemd-user")) { |
05a049cc | 252 | _cleanup_free_ char *p = NULL, *rt = NULL; |
30b2c336 | 253 | |
de0671ee | 254 | if (asprintf(&p, "/run/systemd/users/"UID_FMT, pw->pw_uid) < 0) |
ffcfcb6b | 255 | return PAM_BUF_ERR; |
30b2c336 LP |
256 | |
257 | r = parse_env_file(p, NEWLINE, | |
258 | "RUNTIME", &rt, | |
259 | NULL); | |
ffcfcb6b ZJS |
260 | if (r < 0 && r != -ENOENT) |
261 | return PAM_SESSION_ERR; | |
30b2c336 LP |
262 | |
263 | if (rt) { | |
264 | r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0); | |
30b2c336 LP |
265 | if (r != PAM_SUCCESS) { |
266 | pam_syslog(handle, LOG_ERR, "Failed to set runtime dir."); | |
ffcfcb6b | 267 | return r; |
30b2c336 | 268 | } |
8b255ecd KS |
269 | |
270 | r = export_legacy_dbus_address(handle, pw->pw_uid, rt); | |
271 | if (r != PAM_SUCCESS) | |
272 | return r; | |
30b2c336 LP |
273 | } |
274 | ||
ffcfcb6b | 275 | return PAM_SUCCESS; |
8c6db833 LP |
276 | } |
277 | ||
ffcfcb6b | 278 | /* Otherwise, we ask logind to create a session for us */ |
8c6db833 | 279 | |
98a28fef LP |
280 | pam_get_item(handle, PAM_XDISPLAY, (const void**) &display); |
281 | pam_get_item(handle, PAM_TTY, (const void**) &tty); | |
282 | pam_get_item(handle, PAM_RUSER, (const void**) &remote_user); | |
283 | pam_get_item(handle, PAM_RHOST, (const void**) &remote_host); | |
a8573ccc | 284 | |
bbc73283 | 285 | seat = pam_getenv(handle, "XDG_SEAT"); |
a8573ccc LP |
286 | if (isempty(seat)) |
287 | seat = getenv("XDG_SEAT"); | |
288 | ||
bbc73283 | 289 | cvtnr = pam_getenv(handle, "XDG_VTNR"); |
a8573ccc LP |
290 | if (isempty(cvtnr)) |
291 | cvtnr = getenv("XDG_VTNR"); | |
98a28fef | 292 | |
49ebd11f LP |
293 | type = pam_getenv(handle, "XDG_SESSION_TYPE"); |
294 | if (isempty(type)) | |
295 | type = getenv("XDG_SESSION_TYPE"); | |
296 | if (isempty(type)) | |
297 | type = type_pam; | |
298 | ||
299 | class = pam_getenv(handle, "XDG_SESSION_CLASS"); | |
300 | if (isempty(class)) | |
301 | class = getenv("XDG_SESSION_CLASS"); | |
302 | if (isempty(class)) | |
303 | class = class_pam; | |
304 | ||
a4cd87e9 LP |
305 | desktop = pam_getenv(handle, "XDG_SESSION_DESKTOP"); |
306 | if (isempty(desktop)) | |
307 | desktop = getenv("XDG_SESSION_DESKTOP"); | |
308 | ||
ed18b08b | 309 | tty = strempty(tty); |
98a28fef | 310 | |
ee8545b0 | 311 | if (strchr(tty, ':')) { |
e2acb67b LP |
312 | /* A tty with a colon is usually an X11 display, |
313 | * placed there to show up in utmp. We rearrange | |
314 | * things and don't pretend that an X display was a | |
315 | * tty. */ | |
ee8545b0 LP |
316 | |
317 | if (isempty(display)) | |
318 | display = tty; | |
a4cd87e9 | 319 | tty = NULL; |
1a4459d6 | 320 | } else if (streq(tty, "cron")) { |
0ad1271f LP |
321 | /* cron has been setting PAM_TTY to "cron" for a very |
322 | * long time and it probably shouldn't stop doing that | |
323 | * for compatibility reasons. */ | |
0ad1271f | 324 | type = "unspecified"; |
49ebd11f | 325 | class = "background"; |
a4cd87e9 | 326 | tty = NULL; |
0ad1271f LP |
327 | } else if (streq(tty, "ssh")) { |
328 | /* ssh has been setting PAM_TTY to "ssh" for a very | |
329 | * long time and probably shouldn't stop doing that | |
330 | * for compatibility reasons. */ | |
0ad1271f | 331 | type ="tty"; |
49ebd11f | 332 | class = "user"; |
a4cd87e9 | 333 | tty = NULL; |
ee8545b0 LP |
334 | } |
335 | ||
8e7705e5 | 336 | /* If this fails vtnr will be 0, that's intended */ |
4d6d6518 LP |
337 | if (!isempty(cvtnr)) |
338 | safe_atou32(cvtnr, &vtnr); | |
339 | ||
92bd5ff3 | 340 | if (!isempty(display) && !vtnr) { |
fc7985ed | 341 | if (isempty(seat)) |
6ef25fb6 | 342 | get_seat_from_display(display, &seat, &vtnr); |
fc7985ed | 343 | else if (streq(seat, "seat0")) |
6ef25fb6 | 344 | get_seat_from_display(display, NULL, &vtnr); |
fc7985ed | 345 | } |
4d6d6518 | 346 | |
49ebd11f LP |
347 | if (seat && !streq(seat, "seat0") && vtnr != 0) { |
348 | pam_syslog(handle, LOG_DEBUG, "Ignoring vtnr %d for %s which is not seat0", vtnr, seat); | |
d7353ef6 MM |
349 | vtnr = 0; |
350 | } | |
351 | ||
49ebd11f | 352 | if (isempty(type)) |
0ad1271f | 353 | type = !isempty(display) ? "x11" : |
49ebd11f | 354 | !isempty(tty) ? "tty" : "unspecified"; |
98a28fef | 355 | |
55efac6c | 356 | if (isempty(class)) |
e2acb67b | 357 | class = streq(type, "unspecified") ? "background" : "user"; |
55efac6c | 358 | |
fecc80c1 | 359 | remote = !isempty(remote_host) && !is_localhost(remote_host); |
98a28fef | 360 | |
4d49b48c | 361 | /* Talk to logind over the message bus */ |
5a330cda | 362 | |
ffcfcb6b ZJS |
363 | r = sd_bus_open_system(&bus); |
364 | if (r < 0) { | |
365 | pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror(-r)); | |
366 | return PAM_SESSION_ERR; | |
cc377381 LP |
367 | } |
368 | ||
ce959314 MS |
369 | if (debug) |
370 | pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: " | |
a4cd87e9 | 371 | "uid=%u pid=%u service=%s type=%s class=%s desktop=%s seat=%s vtnr=%u tty=%s display=%s remote=%s remote_user=%s remote_host=%s", |
baae0358 LP |
372 | pw->pw_uid, getpid(), |
373 | strempty(service), | |
cda7ecb0 | 374 | type, class, strempty(desktop), |
a4cd87e9 | 375 | strempty(seat), vtnr, strempty(tty), strempty(display), |
baae0358 | 376 | yes_no(remote), strempty(remote_user), strempty(remote_host)); |
ce959314 | 377 | |
ffcfcb6b ZJS |
378 | r = sd_bus_call_method(bus, |
379 | "org.freedesktop.login1", | |
380 | "/org/freedesktop/login1", | |
381 | "org.freedesktop.login1.Manager", | |
382 | "CreateSession", | |
383 | &error, | |
384 | &reply, | |
a4cd87e9 | 385 | "uusssssussbssa(sv)", |
baae0358 LP |
386 | (uint32_t) pw->pw_uid, |
387 | (uint32_t) getpid(), | |
a4cd87e9 | 388 | service, |
ffcfcb6b ZJS |
389 | type, |
390 | class, | |
a4cd87e9 LP |
391 | desktop, |
392 | seat, | |
ffcfcb6b ZJS |
393 | vtnr, |
394 | tty, | |
a4cd87e9 | 395 | display, |
ffcfcb6b | 396 | remote, |
a4cd87e9 LP |
397 | remote_user, |
398 | remote_host, | |
ffcfcb6b ZJS |
399 | 0); |
400 | if (r < 0) { | |
8159d91a | 401 | pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error, r)); |
ffcfcb6b | 402 | return PAM_SYSTEM_ERR; |
98a28fef | 403 | } |
74fe1fe3 | 404 | |
ffcfcb6b | 405 | r = sd_bus_message_read(reply, |
baae0358 | 406 | "soshusub", |
ffcfcb6b ZJS |
407 | &id, |
408 | &object_path, | |
409 | &runtime_path, | |
410 | &session_fd, | |
baae0358 | 411 | &original_uid, |
ffcfcb6b ZJS |
412 | &seat, |
413 | &vtnr, | |
414 | &existing); | |
415 | if (r < 0) { | |
416 | pam_syslog(handle, LOG_ERR, "Failed to parse message: %s", strerror(-r)); | |
5a330cda | 417 | return PAM_SESSION_ERR; |
98a28fef | 418 | } |
74fe1fe3 | 419 | |
ce959314 MS |
420 | if (debug) |
421 | pam_syslog(handle, LOG_DEBUG, "Reply from logind: " | |
baae0358 LP |
422 | "id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u original_uid=%u", |
423 | id, object_path, runtime_path, session_fd, seat, vtnr, original_uid); | |
ce959314 | 424 | |
98a28fef LP |
425 | r = pam_misc_setenv(handle, "XDG_SESSION_ID", id, 0); |
426 | if (r != PAM_SUCCESS) { | |
427 | pam_syslog(handle, LOG_ERR, "Failed to set session id."); | |
5a330cda | 428 | return r; |
8c6db833 LP |
429 | } |
430 | ||
baae0358 LP |
431 | if (original_uid == pw->pw_uid) { |
432 | /* Don't set $XDG_RUNTIME_DIR if the user we now | |
433 | * authenticated for does not match the original user | |
434 | * of the session. We do this in order not to result | |
435 | * in privileged apps clobbering the runtime directory | |
436 | * unnecessarily. */ | |
437 | ||
438 | r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", runtime_path, 0); | |
439 | if (r != PAM_SUCCESS) { | |
440 | pam_syslog(handle, LOG_ERR, "Failed to set runtime dir."); | |
441 | return r; | |
442 | } | |
8b255ecd KS |
443 | |
444 | r = export_legacy_dbus_address(handle, pw->pw_uid, runtime_path); | |
445 | if (r != PAM_SUCCESS) | |
446 | return r; | |
98a28fef | 447 | } |
8c6db833 | 448 | |
bbc73283 LP |
449 | if (!isempty(seat)) { |
450 | r = pam_misc_setenv(handle, "XDG_SEAT", seat, 0); | |
451 | if (r != PAM_SUCCESS) { | |
452 | pam_syslog(handle, LOG_ERR, "Failed to set seat."); | |
5a330cda | 453 | return r; |
bbc73283 LP |
454 | } |
455 | } | |
456 | ||
457 | if (vtnr > 0) { | |
29d230f6 | 458 | char buf[DECIMAL_STR_MAX(vtnr)]; |
baae0358 | 459 | sprintf(buf, "%u", vtnr); |
bbc73283 LP |
460 | |
461 | r = pam_misc_setenv(handle, "XDG_VTNR", buf, 0); | |
462 | if (r != PAM_SUCCESS) { | |
463 | pam_syslog(handle, LOG_ERR, "Failed to set virtual terminal number."); | |
5a330cda | 464 | return r; |
bbc73283 LP |
465 | } |
466 | } | |
467 | ||
77085881 LP |
468 | r = pam_set_data(handle, "systemd.existing", INT_TO_PTR(!!existing), NULL); |
469 | if (r != PAM_SUCCESS) { | |
470 | pam_syslog(handle, LOG_ERR, "Failed to install existing flag."); | |
5a330cda | 471 | return r; |
77085881 LP |
472 | } |
473 | ||
21c390cc | 474 | if (session_fd >= 0) { |
85c08dc0 | 475 | session_fd = fcntl(session_fd, F_DUPFD_CLOEXEC, 3); |
5a330cda ZJS |
476 | if (session_fd < 0) { |
477 | pam_syslog(handle, LOG_ERR, "Failed to dup session fd: %m"); | |
478 | return PAM_SESSION_ERR; | |
479 | } | |
480 | ||
21c390cc LP |
481 | r = pam_set_data(handle, "systemd.session-fd", INT_TO_PTR(session_fd+1), NULL); |
482 | if (r != PAM_SUCCESS) { | |
483 | pam_syslog(handle, LOG_ERR, "Failed to install session fd."); | |
03e334a1 | 484 | safe_close(session_fd); |
5a330cda | 485 | return r; |
21c390cc | 486 | } |
98a28fef | 487 | } |
8c6db833 | 488 | |
ffcfcb6b | 489 | return PAM_SUCCESS; |
98a28fef | 490 | } |
8c6db833 | 491 | |
98a28fef LP |
492 | _public_ PAM_EXTERN int pam_sm_close_session( |
493 | pam_handle_t *handle, | |
494 | int flags, | |
495 | int argc, const char **argv) { | |
8c6db833 | 496 | |
29d230f6 | 497 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
24996861 | 498 | _cleanup_bus_close_unref_ sd_bus *bus = NULL; |
5f41d1f1 | 499 | const void *existing = NULL; |
75c8e3cf | 500 | const char *id; |
75c8e3cf | 501 | int r; |
8c6db833 | 502 | |
ffcfcb6b | 503 | assert(handle); |
75c8e3cf | 504 | |
77085881 LP |
505 | /* Only release session if it wasn't pre-existing when we |
506 | * tried to create it */ | |
507 | pam_get_data(handle, "systemd.existing", &existing); | |
508 | ||
75c8e3cf | 509 | id = pam_getenv(handle, "XDG_SESSION_ID"); |
77085881 | 510 | if (id && !existing) { |
75c8e3cf LP |
511 | |
512 | /* Before we go and close the FIFO we need to tell | |
513 | * logind that this is a clean session shutdown, so | |
514 | * that it doesn't just go and slaughter us | |
515 | * immediately after closing the fd */ | |
516 | ||
ffcfcb6b ZJS |
517 | r = sd_bus_open_system(&bus); |
518 | if (r < 0) { | |
5f41d1f1 LP |
519 | pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror(-r)); |
520 | return PAM_SESSION_ERR; | |
75c8e3cf LP |
521 | } |
522 | ||
ffcfcb6b ZJS |
523 | r = sd_bus_call_method(bus, |
524 | "org.freedesktop.login1", | |
525 | "/org/freedesktop/login1", | |
526 | "org.freedesktop.login1.Manager", | |
527 | "ReleaseSession", | |
528 | &error, | |
529 | NULL, | |
530 | "s", | |
531 | id); | |
532 | if (r < 0) { | |
5f41d1f1 LP |
533 | pam_syslog(handle, LOG_ERR, "Failed to release session: %s", bus_error_message(&error, r)); |
534 | return PAM_SESSION_ERR; | |
75c8e3cf LP |
535 | } |
536 | } | |
537 | ||
5f41d1f1 LP |
538 | /* Note that we are knowingly leaking the FIFO fd here. This |
539 | * way, logind can watch us die. If we closed it here it would | |
540 | * not have any clue when that is completed. Given that one | |
541 | * cannot really have multiple PAM sessions open from the same | |
542 | * process this means we will leak one FD at max. */ | |
75c8e3cf | 543 | |
5f41d1f1 | 544 | return PAM_SUCCESS; |
8c6db833 | 545 | } |