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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 | ||
00229fe4 | 22 | #include <endian.h> |
8c6db833 LP |
23 | #include <errno.h> |
24 | #include <fcntl.h> | |
8c6db833 | 25 | #include <pwd.h> |
8c6db833 | 26 | #include <security/_pam_macros.h> |
8c6db833 LP |
27 | #include <security/pam_ext.h> |
28 | #include <security/pam_misc.h> | |
00229fe4 LP |
29 | #include <security/pam_modules.h> |
30 | #include <security/pam_modutil.h> | |
31 | #include <sys/file.h> | |
8c6db833 | 32 | |
d7832d2c | 33 | #include "audit.h" |
00229fe4 LP |
34 | #include "bus-common-errors.h" |
35 | #include "bus-error.h" | |
ffcfcb6b | 36 | #include "bus-util.h" |
98a28fef | 37 | #include "def.h" |
a5c32cff | 38 | #include "fileio.h" |
6482f626 | 39 | #include "formats-util.h" |
958b66ea | 40 | #include "hostname-util.h" |
00229fe4 LP |
41 | #include "login-util.h" |
42 | #include "macro.h" | |
43 | #include "socket-util.h" | |
44 | #include "strv.h" | |
45 | #include "terminal-util.h" | |
46 | #include "util.h" | |
8c6db833 | 47 | |
baae0358 LP |
48 | static int parse_argv( |
49 | pam_handle_t *handle, | |
50 | int argc, const char **argv, | |
51 | const char **class, | |
49ebd11f | 52 | const char **type, |
baae0358 | 53 | bool *debug) { |
8c6db833 LP |
54 | |
55 | unsigned i; | |
56 | ||
57 | assert(argc >= 0); | |
58 | assert(argc == 0 || argv); | |
59 | ||
49ebd11f | 60 | for (i = 0; i < (unsigned) argc; i++) { |
fb6becb4 | 61 | if (startswith(argv[i], "class=")) { |
485507b8 MM |
62 | if (class) |
63 | *class = argv[i] + 6; | |
64 | ||
49ebd11f LP |
65 | } else if (startswith(argv[i], "type=")) { |
66 | if (type) | |
67 | *type = argv[i] + 5; | |
68 | ||
05a049cc ZJS |
69 | } else if (streq(argv[i], "debug")) { |
70 | if (debug) | |
71 | *debug = true; | |
fb6becb4 | 72 | |
05a049cc ZJS |
73 | } else if (startswith(argv[i], "debug=")) { |
74 | int k; | |
0e318cad | 75 | |
05a049cc ZJS |
76 | k = parse_boolean(argv[i] + 6); |
77 | if (k < 0) | |
78 | pam_syslog(handle, LOG_WARNING, "Failed to parse debug= argument, ignoring."); | |
79 | else if (debug) | |
0e318cad MS |
80 | *debug = k; |
81 | ||
05a049cc | 82 | } else |
fb6becb4 | 83 | pam_syslog(handle, LOG_WARNING, "Unknown parameter '%s', ignoring", argv[i]); |
49ebd11f | 84 | } |
8c6db833 | 85 | |
8c6db833 LP |
86 | return 0; |
87 | } | |
88 | ||
8c6db833 LP |
89 | static int get_user_data( |
90 | pam_handle_t *handle, | |
91 | const char **ret_username, | |
92 | struct passwd **ret_pw) { | |
93 | ||
d90b9d27 LP |
94 | const char *username = NULL; |
95 | struct passwd *pw = NULL; | |
8c6db833 LP |
96 | int r; |
97 | ||
98 | assert(handle); | |
99 | assert(ret_username); | |
100 | assert(ret_pw); | |
101 | ||
baae0358 LP |
102 | r = pam_get_user(handle, &username, NULL); |
103 | if (r != PAM_SUCCESS) { | |
104 | pam_syslog(handle, LOG_ERR, "Failed to get user name."); | |
105 | return r; | |
106 | } | |
d90b9d27 | 107 | |
baae0358 LP |
108 | if (isempty(username)) { |
109 | pam_syslog(handle, LOG_ERR, "User name not valid."); | |
110 | return PAM_AUTH_ERR; | |
8c6db833 LP |
111 | } |
112 | ||
baae0358 | 113 | pw = pam_modutil_getpwnam(handle, username); |
d90b9d27 | 114 | if (!pw) { |
8c6db833 LP |
115 | pam_syslog(handle, LOG_ERR, "Failed to get user data."); |
116 | return PAM_USER_UNKNOWN; | |
117 | } | |
118 | ||
119 | *ret_pw = pw; | |
8e24a4f8 | 120 | *ret_username = username; |
8c6db833 LP |
121 | |
122 | return PAM_SUCCESS; | |
123 | } | |
124 | ||
4d6d6518 | 125 | static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) { |
b92bea5d ZJS |
126 | union sockaddr_union sa = { |
127 | .un.sun_family = AF_UNIX, | |
128 | }; | |
baae0358 LP |
129 | _cleanup_free_ char *p = NULL, *tty = NULL; |
130 | _cleanup_close_ int fd = -1; | |
4d6d6518 | 131 | struct ucred ucred; |
baae0358 | 132 | int v, r; |
4d6d6518 LP |
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 | 154 | |
eff05270 | 155 | r = getpeercred(fd, &ucred); |
4d6d6518 | 156 | if (r < 0) |
eff05270 | 157 | return r; |
4d6d6518 LP |
158 | |
159 | r = get_ctty(ucred.pid, NULL, &tty); | |
160 | if (r < 0) | |
161 | return r; | |
162 | ||
163 | v = vtnr_from_tty(tty); | |
4d6d6518 LP |
164 | if (v < 0) |
165 | return v; | |
166 | else if (v == 0) | |
167 | return -ENOENT; | |
168 | ||
fc7985ed LP |
169 | if (seat) |
170 | *seat = "seat0"; | |
4d6d6518 LP |
171 | *vtnr = (uint32_t) v; |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
8b255ecd KS |
176 | static int export_legacy_dbus_address( |
177 | pam_handle_t *handle, | |
178 | uid_t uid, | |
179 | const char *runtime) { | |
180 | ||
8b255ecd | 181 | _cleanup_free_ char *s = NULL; |
3df49c28 DH |
182 | int r = PAM_BUF_ERR; |
183 | ||
184 | if (is_kdbus_available()) { | |
185 | if (asprintf(&s, KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT, uid, runtime) < 0) | |
186 | goto error; | |
187 | } else { | |
dc61b7e4 | 188 | /* FIXME: We *really* should move the access() check into the |
3df49c28 DH |
189 | * daemons that spawn dbus-daemon, instead of forcing |
190 | * DBUS_SESSION_BUS_ADDRESS= here. */ | |
191 | ||
192 | s = strjoin(runtime, "/bus", NULL); | |
193 | if (!s) | |
194 | goto error; | |
195 | ||
196 | if (access(s, F_OK) < 0) | |
197 | return PAM_SUCCESS; | |
198 | ||
199 | s = mfree(s); | |
200 | if (asprintf(&s, UNIX_USER_BUS_ADDRESS_FMT, runtime) < 0) | |
201 | goto error; | |
8b255ecd KS |
202 | } |
203 | ||
204 | r = pam_misc_setenv(handle, "DBUS_SESSION_BUS_ADDRESS", s, 0); | |
3df49c28 DH |
205 | if (r != PAM_SUCCESS) |
206 | goto error; | |
1b09f548 | 207 | |
8b255ecd | 208 | return PAM_SUCCESS; |
3df49c28 DH |
209 | |
210 | error: | |
211 | pam_syslog(handle, LOG_ERR, "Failed to set bus variable."); | |
212 | return r; | |
8b255ecd KS |
213 | } |
214 | ||
98a28fef | 215 | _public_ PAM_EXTERN int pam_sm_open_session( |
8c6db833 LP |
216 | pam_handle_t *handle, |
217 | int flags, | |
218 | int argc, const char **argv) { | |
219 | ||
ffcfcb6b ZJS |
220 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
221 | _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; | |
d1529c9e LP |
222 | const char |
223 | *username, *id, *object_path, *runtime_path, | |
224 | *service = NULL, | |
225 | *tty = NULL, *display = NULL, | |
226 | *remote_user = NULL, *remote_host = NULL, | |
227 | *seat = NULL, | |
228 | *type = NULL, *class = NULL, | |
a4cd87e9 | 229 | *class_pam = NULL, *type_pam = NULL, *cvtnr = NULL, *desktop = NULL; |
03976f7b | 230 | _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL; |
d1529c9e | 231 | int session_fd = -1, existing, r; |
d1529c9e LP |
232 | bool debug = false, remote; |
233 | struct passwd *pw; | |
baae0358 LP |
234 | uint32_t vtnr = 0; |
235 | uid_t original_uid; | |
8c6db833 | 236 | |
ffcfcb6b | 237 | assert(handle); |
98a28fef | 238 | |
79d860fe MP |
239 | /* Make this a NOP on non-logind systems */ |
240 | if (!logind_running()) | |
8c6db833 LP |
241 | return PAM_SUCCESS; |
242 | ||
e9fbc77c LP |
243 | if (parse_argv(handle, |
244 | argc, argv, | |
fb6becb4 | 245 | &class_pam, |
49ebd11f | 246 | &type_pam, |
5a330cda ZJS |
247 | &debug) < 0) |
248 | return PAM_SESSION_ERR; | |
74fe1fe3 | 249 | |
baae0358 | 250 | if (debug) |
3831838a | 251 | pam_syslog(handle, LOG_DEBUG, "pam-systemd initializing"); |
baae0358 | 252 | |
98a28fef | 253 | r = get_user_data(handle, &username, &pw); |
5a330cda ZJS |
254 | if (r != PAM_SUCCESS) { |
255 | pam_syslog(handle, LOG_ERR, "Failed to get user data."); | |
256 | return r; | |
257 | } | |
8c6db833 | 258 | |
30b2c336 LP |
259 | /* Make sure we don't enter a loop by talking to |
260 | * systemd-logind when it is actually waiting for the | |
261 | * background to finish start-up. If the service is | |
5c390a4a | 262 | * "systemd-user" we simply set XDG_RUNTIME_DIR and |
30b2c336 LP |
263 | * leave. */ |
264 | ||
265 | pam_get_item(handle, PAM_SERVICE, (const void**) &service); | |
5c390a4a | 266 | if (streq_ptr(service, "systemd-user")) { |
05a049cc | 267 | _cleanup_free_ char *p = NULL, *rt = NULL; |
30b2c336 | 268 | |
de0671ee | 269 | if (asprintf(&p, "/run/systemd/users/"UID_FMT, pw->pw_uid) < 0) |
ffcfcb6b | 270 | return PAM_BUF_ERR; |
30b2c336 LP |
271 | |
272 | r = parse_env_file(p, NEWLINE, | |
273 | "RUNTIME", &rt, | |
274 | NULL); | |
ffcfcb6b ZJS |
275 | if (r < 0 && r != -ENOENT) |
276 | return PAM_SESSION_ERR; | |
30b2c336 LP |
277 | |
278 | if (rt) { | |
279 | r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0); | |
30b2c336 LP |
280 | if (r != PAM_SUCCESS) { |
281 | pam_syslog(handle, LOG_ERR, "Failed to set runtime dir."); | |
ffcfcb6b | 282 | return r; |
30b2c336 | 283 | } |
8b255ecd KS |
284 | |
285 | r = export_legacy_dbus_address(handle, pw->pw_uid, rt); | |
286 | if (r != PAM_SUCCESS) | |
287 | return r; | |
30b2c336 LP |
288 | } |
289 | ||
ffcfcb6b | 290 | return PAM_SUCCESS; |
8c6db833 LP |
291 | } |
292 | ||
ffcfcb6b | 293 | /* Otherwise, we ask logind to create a session for us */ |
8c6db833 | 294 | |
98a28fef LP |
295 | pam_get_item(handle, PAM_XDISPLAY, (const void**) &display); |
296 | pam_get_item(handle, PAM_TTY, (const void**) &tty); | |
297 | pam_get_item(handle, PAM_RUSER, (const void**) &remote_user); | |
298 | pam_get_item(handle, PAM_RHOST, (const void**) &remote_host); | |
a8573ccc | 299 | |
bbc73283 | 300 | seat = pam_getenv(handle, "XDG_SEAT"); |
a8573ccc LP |
301 | if (isempty(seat)) |
302 | seat = getenv("XDG_SEAT"); | |
303 | ||
bbc73283 | 304 | cvtnr = pam_getenv(handle, "XDG_VTNR"); |
a8573ccc LP |
305 | if (isempty(cvtnr)) |
306 | cvtnr = getenv("XDG_VTNR"); | |
98a28fef | 307 | |
49ebd11f LP |
308 | type = pam_getenv(handle, "XDG_SESSION_TYPE"); |
309 | if (isempty(type)) | |
310 | type = getenv("XDG_SESSION_TYPE"); | |
311 | if (isempty(type)) | |
312 | type = type_pam; | |
313 | ||
314 | class = pam_getenv(handle, "XDG_SESSION_CLASS"); | |
315 | if (isempty(class)) | |
316 | class = getenv("XDG_SESSION_CLASS"); | |
317 | if (isempty(class)) | |
318 | class = class_pam; | |
319 | ||
a4cd87e9 LP |
320 | desktop = pam_getenv(handle, "XDG_SESSION_DESKTOP"); |
321 | if (isempty(desktop)) | |
322 | desktop = getenv("XDG_SESSION_DESKTOP"); | |
323 | ||
ed18b08b | 324 | tty = strempty(tty); |
98a28fef | 325 | |
ee8545b0 | 326 | if (strchr(tty, ':')) { |
e2acb67b LP |
327 | /* A tty with a colon is usually an X11 display, |
328 | * placed there to show up in utmp. We rearrange | |
329 | * things and don't pretend that an X display was a | |
330 | * tty. */ | |
ee8545b0 LP |
331 | |
332 | if (isempty(display)) | |
333 | display = tty; | |
a4cd87e9 | 334 | tty = NULL; |
1a4459d6 | 335 | } else if (streq(tty, "cron")) { |
0ad1271f LP |
336 | /* cron has been setting PAM_TTY to "cron" for a very |
337 | * long time and it probably shouldn't stop doing that | |
338 | * for compatibility reasons. */ | |
0ad1271f | 339 | type = "unspecified"; |
49ebd11f | 340 | class = "background"; |
a4cd87e9 | 341 | tty = NULL; |
0ad1271f LP |
342 | } else if (streq(tty, "ssh")) { |
343 | /* ssh has been setting PAM_TTY to "ssh" for a very | |
344 | * long time and probably shouldn't stop doing that | |
345 | * for compatibility reasons. */ | |
0ad1271f | 346 | type ="tty"; |
49ebd11f | 347 | class = "user"; |
a4cd87e9 | 348 | tty = NULL; |
ee8545b0 LP |
349 | } |
350 | ||
8e7705e5 | 351 | /* If this fails vtnr will be 0, that's intended */ |
4d6d6518 | 352 | if (!isempty(cvtnr)) |
2ae4842b | 353 | (void) safe_atou32(cvtnr, &vtnr); |
4d6d6518 | 354 | |
92bd5ff3 | 355 | if (!isempty(display) && !vtnr) { |
fc7985ed | 356 | if (isempty(seat)) |
6ef25fb6 | 357 | get_seat_from_display(display, &seat, &vtnr); |
fc7985ed | 358 | else if (streq(seat, "seat0")) |
6ef25fb6 | 359 | get_seat_from_display(display, NULL, &vtnr); |
fc7985ed | 360 | } |
4d6d6518 | 361 | |
49ebd11f | 362 | if (seat && !streq(seat, "seat0") && vtnr != 0) { |
1fa2f38f | 363 | pam_syslog(handle, LOG_DEBUG, "Ignoring vtnr %"PRIu32" for %s which is not seat0", vtnr, seat); |
d7353ef6 MM |
364 | vtnr = 0; |
365 | } | |
366 | ||
49ebd11f | 367 | if (isempty(type)) |
0ad1271f | 368 | type = !isempty(display) ? "x11" : |
49ebd11f | 369 | !isempty(tty) ? "tty" : "unspecified"; |
98a28fef | 370 | |
55efac6c | 371 | if (isempty(class)) |
e2acb67b | 372 | class = streq(type, "unspecified") ? "background" : "user"; |
55efac6c | 373 | |
fecc80c1 | 374 | remote = !isempty(remote_host) && !is_localhost(remote_host); |
98a28fef | 375 | |
4d49b48c | 376 | /* Talk to logind over the message bus */ |
5a330cda | 377 | |
ffcfcb6b ZJS |
378 | r = sd_bus_open_system(&bus); |
379 | if (r < 0) { | |
380 | pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror(-r)); | |
381 | return PAM_SESSION_ERR; | |
cc377381 LP |
382 | } |
383 | ||
ce959314 MS |
384 | if (debug) |
385 | pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: " | |
1fa2f38f | 386 | "uid="UID_FMT" pid="PID_FMT" service=%s type=%s class=%s desktop=%s seat=%s vtnr=%"PRIu32" tty=%s display=%s remote=%s remote_user=%s remote_host=%s", |
baae0358 LP |
387 | pw->pw_uid, getpid(), |
388 | strempty(service), | |
cda7ecb0 | 389 | type, class, strempty(desktop), |
a4cd87e9 | 390 | strempty(seat), vtnr, strempty(tty), strempty(display), |
baae0358 | 391 | yes_no(remote), strempty(remote_user), strempty(remote_host)); |
ce959314 | 392 | |
ffcfcb6b ZJS |
393 | r = sd_bus_call_method(bus, |
394 | "org.freedesktop.login1", | |
395 | "/org/freedesktop/login1", | |
396 | "org.freedesktop.login1.Manager", | |
397 | "CreateSession", | |
398 | &error, | |
399 | &reply, | |
a4cd87e9 | 400 | "uusssssussbssa(sv)", |
baae0358 LP |
401 | (uint32_t) pw->pw_uid, |
402 | (uint32_t) getpid(), | |
a4cd87e9 | 403 | service, |
ffcfcb6b ZJS |
404 | type, |
405 | class, | |
a4cd87e9 LP |
406 | desktop, |
407 | seat, | |
ffcfcb6b ZJS |
408 | vtnr, |
409 | tty, | |
a4cd87e9 | 410 | display, |
ffcfcb6b | 411 | remote, |
a4cd87e9 LP |
412 | remote_user, |
413 | remote_host, | |
ffcfcb6b ZJS |
414 | 0); |
415 | if (r < 0) { | |
b80120c4 DH |
416 | if (sd_bus_error_has_name(&error, BUS_ERROR_SESSION_BUSY)) { |
417 | pam_syslog(handle, LOG_DEBUG, "Cannot create session: %s", bus_error_message(&error, r)); | |
418 | return PAM_SUCCESS; | |
419 | } else { | |
420 | pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error, r)); | |
421 | return PAM_SYSTEM_ERR; | |
422 | } | |
98a28fef | 423 | } |
74fe1fe3 | 424 | |
ffcfcb6b | 425 | r = sd_bus_message_read(reply, |
baae0358 | 426 | "soshusub", |
ffcfcb6b ZJS |
427 | &id, |
428 | &object_path, | |
429 | &runtime_path, | |
430 | &session_fd, | |
baae0358 | 431 | &original_uid, |
ffcfcb6b ZJS |
432 | &seat, |
433 | &vtnr, | |
434 | &existing); | |
435 | if (r < 0) { | |
436 | pam_syslog(handle, LOG_ERR, "Failed to parse message: %s", strerror(-r)); | |
5a330cda | 437 | return PAM_SESSION_ERR; |
98a28fef | 438 | } |
74fe1fe3 | 439 | |
ce959314 MS |
440 | if (debug) |
441 | pam_syslog(handle, LOG_DEBUG, "Reply from logind: " | |
baae0358 LP |
442 | "id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u original_uid=%u", |
443 | id, object_path, runtime_path, session_fd, seat, vtnr, original_uid); | |
ce959314 | 444 | |
98a28fef LP |
445 | r = pam_misc_setenv(handle, "XDG_SESSION_ID", id, 0); |
446 | if (r != PAM_SUCCESS) { | |
447 | pam_syslog(handle, LOG_ERR, "Failed to set session id."); | |
5a330cda | 448 | return r; |
8c6db833 LP |
449 | } |
450 | ||
baae0358 LP |
451 | if (original_uid == pw->pw_uid) { |
452 | /* Don't set $XDG_RUNTIME_DIR if the user we now | |
453 | * authenticated for does not match the original user | |
454 | * of the session. We do this in order not to result | |
455 | * in privileged apps clobbering the runtime directory | |
456 | * unnecessarily. */ | |
457 | ||
458 | r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", runtime_path, 0); | |
459 | if (r != PAM_SUCCESS) { | |
460 | pam_syslog(handle, LOG_ERR, "Failed to set runtime dir."); | |
461 | return r; | |
462 | } | |
8b255ecd KS |
463 | |
464 | r = export_legacy_dbus_address(handle, pw->pw_uid, runtime_path); | |
465 | if (r != PAM_SUCCESS) | |
466 | return r; | |
98a28fef | 467 | } |
8c6db833 | 468 | |
bbc73283 LP |
469 | if (!isempty(seat)) { |
470 | r = pam_misc_setenv(handle, "XDG_SEAT", seat, 0); | |
471 | if (r != PAM_SUCCESS) { | |
472 | pam_syslog(handle, LOG_ERR, "Failed to set seat."); | |
5a330cda | 473 | return r; |
bbc73283 LP |
474 | } |
475 | } | |
476 | ||
477 | if (vtnr > 0) { | |
29d230f6 | 478 | char buf[DECIMAL_STR_MAX(vtnr)]; |
baae0358 | 479 | sprintf(buf, "%u", vtnr); |
bbc73283 LP |
480 | |
481 | r = pam_misc_setenv(handle, "XDG_VTNR", buf, 0); | |
482 | if (r != PAM_SUCCESS) { | |
483 | pam_syslog(handle, LOG_ERR, "Failed to set virtual terminal number."); | |
5a330cda | 484 | return r; |
bbc73283 LP |
485 | } |
486 | } | |
487 | ||
77085881 LP |
488 | r = pam_set_data(handle, "systemd.existing", INT_TO_PTR(!!existing), NULL); |
489 | if (r != PAM_SUCCESS) { | |
490 | pam_syslog(handle, LOG_ERR, "Failed to install existing flag."); | |
5a330cda | 491 | return r; |
77085881 LP |
492 | } |
493 | ||
21c390cc | 494 | if (session_fd >= 0) { |
85c08dc0 | 495 | session_fd = fcntl(session_fd, F_DUPFD_CLOEXEC, 3); |
5a330cda ZJS |
496 | if (session_fd < 0) { |
497 | pam_syslog(handle, LOG_ERR, "Failed to dup session fd: %m"); | |
498 | return PAM_SESSION_ERR; | |
499 | } | |
500 | ||
21c390cc LP |
501 | r = pam_set_data(handle, "systemd.session-fd", INT_TO_PTR(session_fd+1), NULL); |
502 | if (r != PAM_SUCCESS) { | |
503 | pam_syslog(handle, LOG_ERR, "Failed to install session fd."); | |
03e334a1 | 504 | safe_close(session_fd); |
5a330cda | 505 | return r; |
21c390cc | 506 | } |
98a28fef | 507 | } |
8c6db833 | 508 | |
ffcfcb6b | 509 | return PAM_SUCCESS; |
98a28fef | 510 | } |
8c6db833 | 511 | |
98a28fef LP |
512 | _public_ PAM_EXTERN int pam_sm_close_session( |
513 | pam_handle_t *handle, | |
514 | int flags, | |
515 | int argc, const char **argv) { | |
8c6db833 | 516 | |
29d230f6 | 517 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
03976f7b | 518 | _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL; |
5f41d1f1 | 519 | const void *existing = NULL; |
75c8e3cf | 520 | const char *id; |
75c8e3cf | 521 | int r; |
8c6db833 | 522 | |
ffcfcb6b | 523 | assert(handle); |
75c8e3cf | 524 | |
77085881 LP |
525 | /* Only release session if it wasn't pre-existing when we |
526 | * tried to create it */ | |
527 | pam_get_data(handle, "systemd.existing", &existing); | |
528 | ||
75c8e3cf | 529 | id = pam_getenv(handle, "XDG_SESSION_ID"); |
77085881 | 530 | if (id && !existing) { |
75c8e3cf LP |
531 | |
532 | /* Before we go and close the FIFO we need to tell | |
533 | * logind that this is a clean session shutdown, so | |
534 | * that it doesn't just go and slaughter us | |
535 | * immediately after closing the fd */ | |
536 | ||
ffcfcb6b ZJS |
537 | r = sd_bus_open_system(&bus); |
538 | if (r < 0) { | |
5f41d1f1 LP |
539 | pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror(-r)); |
540 | return PAM_SESSION_ERR; | |
75c8e3cf LP |
541 | } |
542 | ||
ffcfcb6b ZJS |
543 | r = sd_bus_call_method(bus, |
544 | "org.freedesktop.login1", | |
545 | "/org/freedesktop/login1", | |
546 | "org.freedesktop.login1.Manager", | |
547 | "ReleaseSession", | |
548 | &error, | |
549 | NULL, | |
550 | "s", | |
551 | id); | |
552 | if (r < 0) { | |
5f41d1f1 LP |
553 | pam_syslog(handle, LOG_ERR, "Failed to release session: %s", bus_error_message(&error, r)); |
554 | return PAM_SESSION_ERR; | |
75c8e3cf LP |
555 | } |
556 | } | |
557 | ||
5f41d1f1 LP |
558 | /* Note that we are knowingly leaking the FIFO fd here. This |
559 | * way, logind can watch us die. If we closed it here it would | |
560 | * not have any clue when that is completed. Given that one | |
561 | * cannot really have multiple PAM sessions open from the same | |
562 | * process this means we will leak one FD at max. */ | |
75c8e3cf | 563 | |
5f41d1f1 | 564 | return PAM_SUCCESS; |
8c6db833 | 565 | } |