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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" |
3ffd4af2 | 38 | #include "fd-util.h" |
a5c32cff | 39 | #include "fileio.h" |
6482f626 | 40 | #include "formats-util.h" |
958b66ea | 41 | #include "hostname-util.h" |
00229fe4 LP |
42 | #include "login-util.h" |
43 | #include "macro.h" | |
6bedfcbb | 44 | #include "parse-util.h" |
00229fe4 LP |
45 | #include "socket-util.h" |
46 | #include "strv.h" | |
47 | #include "terminal-util.h" | |
48 | #include "util.h" | |
8c6db833 | 49 | |
baae0358 LP |
50 | static int parse_argv( |
51 | pam_handle_t *handle, | |
52 | int argc, const char **argv, | |
53 | const char **class, | |
49ebd11f | 54 | const char **type, |
baae0358 | 55 | bool *debug) { |
8c6db833 LP |
56 | |
57 | unsigned i; | |
58 | ||
59 | assert(argc >= 0); | |
60 | assert(argc == 0 || argv); | |
61 | ||
49ebd11f | 62 | for (i = 0; i < (unsigned) argc; i++) { |
fb6becb4 | 63 | if (startswith(argv[i], "class=")) { |
485507b8 MM |
64 | if (class) |
65 | *class = argv[i] + 6; | |
66 | ||
49ebd11f LP |
67 | } else if (startswith(argv[i], "type=")) { |
68 | if (type) | |
69 | *type = argv[i] + 5; | |
70 | ||
05a049cc ZJS |
71 | } else if (streq(argv[i], "debug")) { |
72 | if (debug) | |
73 | *debug = true; | |
fb6becb4 | 74 | |
05a049cc ZJS |
75 | } else if (startswith(argv[i], "debug=")) { |
76 | int k; | |
0e318cad | 77 | |
05a049cc ZJS |
78 | k = parse_boolean(argv[i] + 6); |
79 | if (k < 0) | |
80 | pam_syslog(handle, LOG_WARNING, "Failed to parse debug= argument, ignoring."); | |
81 | else if (debug) | |
0e318cad MS |
82 | *debug = k; |
83 | ||
05a049cc | 84 | } else |
fb6becb4 | 85 | pam_syslog(handle, LOG_WARNING, "Unknown parameter '%s', ignoring", argv[i]); |
49ebd11f | 86 | } |
8c6db833 | 87 | |
8c6db833 LP |
88 | return 0; |
89 | } | |
90 | ||
8c6db833 LP |
91 | static int get_user_data( |
92 | pam_handle_t *handle, | |
93 | const char **ret_username, | |
94 | struct passwd **ret_pw) { | |
95 | ||
d90b9d27 LP |
96 | const char *username = NULL; |
97 | struct passwd *pw = NULL; | |
8c6db833 LP |
98 | int r; |
99 | ||
100 | assert(handle); | |
101 | assert(ret_username); | |
102 | assert(ret_pw); | |
103 | ||
baae0358 LP |
104 | r = pam_get_user(handle, &username, NULL); |
105 | if (r != PAM_SUCCESS) { | |
106 | pam_syslog(handle, LOG_ERR, "Failed to get user name."); | |
107 | return r; | |
108 | } | |
d90b9d27 | 109 | |
baae0358 LP |
110 | if (isempty(username)) { |
111 | pam_syslog(handle, LOG_ERR, "User name not valid."); | |
112 | return PAM_AUTH_ERR; | |
8c6db833 LP |
113 | } |
114 | ||
baae0358 | 115 | pw = pam_modutil_getpwnam(handle, username); |
d90b9d27 | 116 | if (!pw) { |
8c6db833 LP |
117 | pam_syslog(handle, LOG_ERR, "Failed to get user data."); |
118 | return PAM_USER_UNKNOWN; | |
119 | } | |
120 | ||
121 | *ret_pw = pw; | |
8e24a4f8 | 122 | *ret_username = username; |
8c6db833 LP |
123 | |
124 | return PAM_SUCCESS; | |
125 | } | |
126 | ||
4d6d6518 | 127 | static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) { |
b92bea5d ZJS |
128 | union sockaddr_union sa = { |
129 | .un.sun_family = AF_UNIX, | |
130 | }; | |
baae0358 LP |
131 | _cleanup_free_ char *p = NULL, *tty = NULL; |
132 | _cleanup_close_ int fd = -1; | |
4d6d6518 | 133 | struct ucred ucred; |
baae0358 | 134 | int v, r; |
4d6d6518 LP |
135 | |
136 | assert(display); | |
4d6d6518 LP |
137 | assert(vtnr); |
138 | ||
139 | /* We deduce the X11 socket from the display name, then use | |
140 | * SO_PEERCRED to determine the X11 server process, ask for | |
141 | * the controlling tty of that and if it's a VC then we know | |
142 | * the seat and the virtual terminal. Sounds ugly, is only | |
143 | * semi-ugly. */ | |
144 | ||
145 | r = socket_from_display(display, &p); | |
146 | if (r < 0) | |
147 | return r; | |
b92bea5d | 148 | strncpy(sa.un.sun_path, p, sizeof(sa.un.sun_path)-1); |
4d6d6518 LP |
149 | |
150 | fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0); | |
b92bea5d | 151 | if (fd < 0) |
4d6d6518 | 152 | return -errno; |
4d6d6518 | 153 | |
b92bea5d | 154 | if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) |
4d6d6518 | 155 | return -errno; |
4d6d6518 | 156 | |
eff05270 | 157 | r = getpeercred(fd, &ucred); |
4d6d6518 | 158 | if (r < 0) |
eff05270 | 159 | return r; |
4d6d6518 LP |
160 | |
161 | r = get_ctty(ucred.pid, NULL, &tty); | |
162 | if (r < 0) | |
163 | return r; | |
164 | ||
165 | v = vtnr_from_tty(tty); | |
4d6d6518 LP |
166 | if (v < 0) |
167 | return v; | |
168 | else if (v == 0) | |
169 | return -ENOENT; | |
170 | ||
fc7985ed LP |
171 | if (seat) |
172 | *seat = "seat0"; | |
4d6d6518 LP |
173 | *vtnr = (uint32_t) v; |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
8b255ecd KS |
178 | static int export_legacy_dbus_address( |
179 | pam_handle_t *handle, | |
180 | uid_t uid, | |
181 | const char *runtime) { | |
182 | ||
8b255ecd | 183 | _cleanup_free_ char *s = NULL; |
3df49c28 DH |
184 | int r = PAM_BUF_ERR; |
185 | ||
186 | if (is_kdbus_available()) { | |
187 | if (asprintf(&s, KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT, uid, runtime) < 0) | |
188 | goto error; | |
189 | } else { | |
dc61b7e4 | 190 | /* FIXME: We *really* should move the access() check into the |
3df49c28 DH |
191 | * daemons that spawn dbus-daemon, instead of forcing |
192 | * DBUS_SESSION_BUS_ADDRESS= here. */ | |
193 | ||
194 | s = strjoin(runtime, "/bus", NULL); | |
195 | if (!s) | |
196 | goto error; | |
197 | ||
198 | if (access(s, F_OK) < 0) | |
199 | return PAM_SUCCESS; | |
200 | ||
201 | s = mfree(s); | |
202 | if (asprintf(&s, UNIX_USER_BUS_ADDRESS_FMT, runtime) < 0) | |
203 | goto error; | |
8b255ecd KS |
204 | } |
205 | ||
206 | r = pam_misc_setenv(handle, "DBUS_SESSION_BUS_ADDRESS", s, 0); | |
3df49c28 DH |
207 | if (r != PAM_SUCCESS) |
208 | goto error; | |
1b09f548 | 209 | |
8b255ecd | 210 | return PAM_SUCCESS; |
3df49c28 DH |
211 | |
212 | error: | |
213 | pam_syslog(handle, LOG_ERR, "Failed to set bus variable."); | |
214 | return r; | |
8b255ecd KS |
215 | } |
216 | ||
98a28fef | 217 | _public_ PAM_EXTERN int pam_sm_open_session( |
8c6db833 LP |
218 | pam_handle_t *handle, |
219 | int flags, | |
220 | int argc, const char **argv) { | |
221 | ||
ffcfcb6b ZJS |
222 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
223 | _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; | |
d1529c9e LP |
224 | const char |
225 | *username, *id, *object_path, *runtime_path, | |
226 | *service = NULL, | |
227 | *tty = NULL, *display = NULL, | |
228 | *remote_user = NULL, *remote_host = NULL, | |
229 | *seat = NULL, | |
230 | *type = NULL, *class = NULL, | |
a4cd87e9 | 231 | *class_pam = NULL, *type_pam = NULL, *cvtnr = NULL, *desktop = NULL; |
03976f7b | 232 | _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL; |
d1529c9e | 233 | int session_fd = -1, existing, r; |
d1529c9e LP |
234 | bool debug = false, remote; |
235 | struct passwd *pw; | |
baae0358 LP |
236 | uint32_t vtnr = 0; |
237 | uid_t original_uid; | |
8c6db833 | 238 | |
ffcfcb6b | 239 | assert(handle); |
98a28fef | 240 | |
79d860fe MP |
241 | /* Make this a NOP on non-logind systems */ |
242 | if (!logind_running()) | |
8c6db833 LP |
243 | return PAM_SUCCESS; |
244 | ||
e9fbc77c LP |
245 | if (parse_argv(handle, |
246 | argc, argv, | |
fb6becb4 | 247 | &class_pam, |
49ebd11f | 248 | &type_pam, |
5a330cda ZJS |
249 | &debug) < 0) |
250 | return PAM_SESSION_ERR; | |
74fe1fe3 | 251 | |
baae0358 | 252 | if (debug) |
3831838a | 253 | pam_syslog(handle, LOG_DEBUG, "pam-systemd initializing"); |
baae0358 | 254 | |
98a28fef | 255 | r = get_user_data(handle, &username, &pw); |
5a330cda ZJS |
256 | if (r != PAM_SUCCESS) { |
257 | pam_syslog(handle, LOG_ERR, "Failed to get user data."); | |
258 | return r; | |
259 | } | |
8c6db833 | 260 | |
30b2c336 LP |
261 | /* Make sure we don't enter a loop by talking to |
262 | * systemd-logind when it is actually waiting for the | |
263 | * background to finish start-up. If the service is | |
5c390a4a | 264 | * "systemd-user" we simply set XDG_RUNTIME_DIR and |
30b2c336 LP |
265 | * leave. */ |
266 | ||
267 | pam_get_item(handle, PAM_SERVICE, (const void**) &service); | |
5c390a4a | 268 | if (streq_ptr(service, "systemd-user")) { |
05a049cc | 269 | _cleanup_free_ char *p = NULL, *rt = NULL; |
30b2c336 | 270 | |
de0671ee | 271 | if (asprintf(&p, "/run/systemd/users/"UID_FMT, pw->pw_uid) < 0) |
ffcfcb6b | 272 | return PAM_BUF_ERR; |
30b2c336 LP |
273 | |
274 | r = parse_env_file(p, NEWLINE, | |
275 | "RUNTIME", &rt, | |
276 | NULL); | |
ffcfcb6b ZJS |
277 | if (r < 0 && r != -ENOENT) |
278 | return PAM_SESSION_ERR; | |
30b2c336 LP |
279 | |
280 | if (rt) { | |
281 | r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0); | |
30b2c336 LP |
282 | if (r != PAM_SUCCESS) { |
283 | pam_syslog(handle, LOG_ERR, "Failed to set runtime dir."); | |
ffcfcb6b | 284 | return r; |
30b2c336 | 285 | } |
8b255ecd KS |
286 | |
287 | r = export_legacy_dbus_address(handle, pw->pw_uid, rt); | |
288 | if (r != PAM_SUCCESS) | |
289 | return r; | |
30b2c336 LP |
290 | } |
291 | ||
ffcfcb6b | 292 | return PAM_SUCCESS; |
8c6db833 LP |
293 | } |
294 | ||
ffcfcb6b | 295 | /* Otherwise, we ask logind to create a session for us */ |
8c6db833 | 296 | |
98a28fef LP |
297 | pam_get_item(handle, PAM_XDISPLAY, (const void**) &display); |
298 | pam_get_item(handle, PAM_TTY, (const void**) &tty); | |
299 | pam_get_item(handle, PAM_RUSER, (const void**) &remote_user); | |
300 | pam_get_item(handle, PAM_RHOST, (const void**) &remote_host); | |
a8573ccc | 301 | |
bbc73283 | 302 | seat = pam_getenv(handle, "XDG_SEAT"); |
a8573ccc LP |
303 | if (isempty(seat)) |
304 | seat = getenv("XDG_SEAT"); | |
305 | ||
bbc73283 | 306 | cvtnr = pam_getenv(handle, "XDG_VTNR"); |
a8573ccc LP |
307 | if (isempty(cvtnr)) |
308 | cvtnr = getenv("XDG_VTNR"); | |
98a28fef | 309 | |
49ebd11f LP |
310 | type = pam_getenv(handle, "XDG_SESSION_TYPE"); |
311 | if (isempty(type)) | |
312 | type = getenv("XDG_SESSION_TYPE"); | |
313 | if (isempty(type)) | |
314 | type = type_pam; | |
315 | ||
316 | class = pam_getenv(handle, "XDG_SESSION_CLASS"); | |
317 | if (isempty(class)) | |
318 | class = getenv("XDG_SESSION_CLASS"); | |
319 | if (isempty(class)) | |
320 | class = class_pam; | |
321 | ||
a4cd87e9 LP |
322 | desktop = pam_getenv(handle, "XDG_SESSION_DESKTOP"); |
323 | if (isempty(desktop)) | |
324 | desktop = getenv("XDG_SESSION_DESKTOP"); | |
325 | ||
ed18b08b | 326 | tty = strempty(tty); |
98a28fef | 327 | |
ee8545b0 | 328 | if (strchr(tty, ':')) { |
e2acb67b LP |
329 | /* A tty with a colon is usually an X11 display, |
330 | * placed there to show up in utmp. We rearrange | |
331 | * things and don't pretend that an X display was a | |
332 | * tty. */ | |
ee8545b0 LP |
333 | |
334 | if (isempty(display)) | |
335 | display = tty; | |
a4cd87e9 | 336 | tty = NULL; |
1a4459d6 | 337 | } else if (streq(tty, "cron")) { |
0ad1271f LP |
338 | /* cron has been setting PAM_TTY to "cron" for a very |
339 | * long time and it probably shouldn't stop doing that | |
340 | * for compatibility reasons. */ | |
0ad1271f | 341 | type = "unspecified"; |
49ebd11f | 342 | class = "background"; |
a4cd87e9 | 343 | tty = NULL; |
0ad1271f LP |
344 | } else if (streq(tty, "ssh")) { |
345 | /* ssh has been setting PAM_TTY to "ssh" for a very | |
346 | * long time and probably shouldn't stop doing that | |
347 | * for compatibility reasons. */ | |
0ad1271f | 348 | type ="tty"; |
49ebd11f | 349 | class = "user"; |
a4cd87e9 | 350 | tty = NULL; |
ee8545b0 LP |
351 | } |
352 | ||
8e7705e5 | 353 | /* If this fails vtnr will be 0, that's intended */ |
4d6d6518 | 354 | if (!isempty(cvtnr)) |
2ae4842b | 355 | (void) safe_atou32(cvtnr, &vtnr); |
4d6d6518 | 356 | |
92bd5ff3 | 357 | if (!isempty(display) && !vtnr) { |
fc7985ed | 358 | if (isempty(seat)) |
6ef25fb6 | 359 | get_seat_from_display(display, &seat, &vtnr); |
fc7985ed | 360 | else if (streq(seat, "seat0")) |
6ef25fb6 | 361 | get_seat_from_display(display, NULL, &vtnr); |
fc7985ed | 362 | } |
4d6d6518 | 363 | |
49ebd11f | 364 | if (seat && !streq(seat, "seat0") && vtnr != 0) { |
1fa2f38f | 365 | pam_syslog(handle, LOG_DEBUG, "Ignoring vtnr %"PRIu32" for %s which is not seat0", vtnr, seat); |
d7353ef6 MM |
366 | vtnr = 0; |
367 | } | |
368 | ||
49ebd11f | 369 | if (isempty(type)) |
0ad1271f | 370 | type = !isempty(display) ? "x11" : |
49ebd11f | 371 | !isempty(tty) ? "tty" : "unspecified"; |
98a28fef | 372 | |
55efac6c | 373 | if (isempty(class)) |
e2acb67b | 374 | class = streq(type, "unspecified") ? "background" : "user"; |
55efac6c | 375 | |
fecc80c1 | 376 | remote = !isempty(remote_host) && !is_localhost(remote_host); |
98a28fef | 377 | |
4d49b48c | 378 | /* Talk to logind over the message bus */ |
5a330cda | 379 | |
ffcfcb6b ZJS |
380 | r = sd_bus_open_system(&bus); |
381 | if (r < 0) { | |
382 | pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror(-r)); | |
383 | return PAM_SESSION_ERR; | |
cc377381 LP |
384 | } |
385 | ||
ce959314 MS |
386 | if (debug) |
387 | pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: " | |
1fa2f38f | 388 | "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 |
389 | pw->pw_uid, getpid(), |
390 | strempty(service), | |
cda7ecb0 | 391 | type, class, strempty(desktop), |
a4cd87e9 | 392 | strempty(seat), vtnr, strempty(tty), strempty(display), |
baae0358 | 393 | yes_no(remote), strempty(remote_user), strempty(remote_host)); |
ce959314 | 394 | |
ffcfcb6b ZJS |
395 | r = sd_bus_call_method(bus, |
396 | "org.freedesktop.login1", | |
397 | "/org/freedesktop/login1", | |
398 | "org.freedesktop.login1.Manager", | |
399 | "CreateSession", | |
400 | &error, | |
401 | &reply, | |
a4cd87e9 | 402 | "uusssssussbssa(sv)", |
baae0358 LP |
403 | (uint32_t) pw->pw_uid, |
404 | (uint32_t) getpid(), | |
a4cd87e9 | 405 | service, |
ffcfcb6b ZJS |
406 | type, |
407 | class, | |
a4cd87e9 LP |
408 | desktop, |
409 | seat, | |
ffcfcb6b ZJS |
410 | vtnr, |
411 | tty, | |
a4cd87e9 | 412 | display, |
ffcfcb6b | 413 | remote, |
a4cd87e9 LP |
414 | remote_user, |
415 | remote_host, | |
ffcfcb6b ZJS |
416 | 0); |
417 | if (r < 0) { | |
b80120c4 DH |
418 | if (sd_bus_error_has_name(&error, BUS_ERROR_SESSION_BUSY)) { |
419 | pam_syslog(handle, LOG_DEBUG, "Cannot create session: %s", bus_error_message(&error, r)); | |
420 | return PAM_SUCCESS; | |
421 | } else { | |
422 | pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error, r)); | |
423 | return PAM_SYSTEM_ERR; | |
424 | } | |
98a28fef | 425 | } |
74fe1fe3 | 426 | |
ffcfcb6b | 427 | r = sd_bus_message_read(reply, |
baae0358 | 428 | "soshusub", |
ffcfcb6b ZJS |
429 | &id, |
430 | &object_path, | |
431 | &runtime_path, | |
432 | &session_fd, | |
baae0358 | 433 | &original_uid, |
ffcfcb6b ZJS |
434 | &seat, |
435 | &vtnr, | |
436 | &existing); | |
437 | if (r < 0) { | |
438 | pam_syslog(handle, LOG_ERR, "Failed to parse message: %s", strerror(-r)); | |
5a330cda | 439 | return PAM_SESSION_ERR; |
98a28fef | 440 | } |
74fe1fe3 | 441 | |
ce959314 MS |
442 | if (debug) |
443 | pam_syslog(handle, LOG_DEBUG, "Reply from logind: " | |
baae0358 LP |
444 | "id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u original_uid=%u", |
445 | id, object_path, runtime_path, session_fd, seat, vtnr, original_uid); | |
ce959314 | 446 | |
98a28fef LP |
447 | r = pam_misc_setenv(handle, "XDG_SESSION_ID", id, 0); |
448 | if (r != PAM_SUCCESS) { | |
449 | pam_syslog(handle, LOG_ERR, "Failed to set session id."); | |
5a330cda | 450 | return r; |
8c6db833 LP |
451 | } |
452 | ||
baae0358 LP |
453 | if (original_uid == pw->pw_uid) { |
454 | /* Don't set $XDG_RUNTIME_DIR if the user we now | |
455 | * authenticated for does not match the original user | |
456 | * of the session. We do this in order not to result | |
457 | * in privileged apps clobbering the runtime directory | |
458 | * unnecessarily. */ | |
459 | ||
460 | r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", runtime_path, 0); | |
461 | if (r != PAM_SUCCESS) { | |
462 | pam_syslog(handle, LOG_ERR, "Failed to set runtime dir."); | |
463 | return r; | |
464 | } | |
8b255ecd KS |
465 | |
466 | r = export_legacy_dbus_address(handle, pw->pw_uid, runtime_path); | |
467 | if (r != PAM_SUCCESS) | |
468 | return r; | |
98a28fef | 469 | } |
8c6db833 | 470 | |
bbc73283 LP |
471 | if (!isempty(seat)) { |
472 | r = pam_misc_setenv(handle, "XDG_SEAT", seat, 0); | |
473 | if (r != PAM_SUCCESS) { | |
474 | pam_syslog(handle, LOG_ERR, "Failed to set seat."); | |
5a330cda | 475 | return r; |
bbc73283 LP |
476 | } |
477 | } | |
478 | ||
479 | if (vtnr > 0) { | |
29d230f6 | 480 | char buf[DECIMAL_STR_MAX(vtnr)]; |
baae0358 | 481 | sprintf(buf, "%u", vtnr); |
bbc73283 LP |
482 | |
483 | r = pam_misc_setenv(handle, "XDG_VTNR", buf, 0); | |
484 | if (r != PAM_SUCCESS) { | |
485 | pam_syslog(handle, LOG_ERR, "Failed to set virtual terminal number."); | |
5a330cda | 486 | return r; |
bbc73283 LP |
487 | } |
488 | } | |
489 | ||
77085881 LP |
490 | r = pam_set_data(handle, "systemd.existing", INT_TO_PTR(!!existing), NULL); |
491 | if (r != PAM_SUCCESS) { | |
492 | pam_syslog(handle, LOG_ERR, "Failed to install existing flag."); | |
5a330cda | 493 | return r; |
77085881 LP |
494 | } |
495 | ||
21c390cc | 496 | if (session_fd >= 0) { |
85c08dc0 | 497 | session_fd = fcntl(session_fd, F_DUPFD_CLOEXEC, 3); |
5a330cda ZJS |
498 | if (session_fd < 0) { |
499 | pam_syslog(handle, LOG_ERR, "Failed to dup session fd: %m"); | |
500 | return PAM_SESSION_ERR; | |
501 | } | |
502 | ||
21c390cc LP |
503 | r = pam_set_data(handle, "systemd.session-fd", INT_TO_PTR(session_fd+1), NULL); |
504 | if (r != PAM_SUCCESS) { | |
505 | pam_syslog(handle, LOG_ERR, "Failed to install session fd."); | |
03e334a1 | 506 | safe_close(session_fd); |
5a330cda | 507 | return r; |
21c390cc | 508 | } |
98a28fef | 509 | } |
8c6db833 | 510 | |
ffcfcb6b | 511 | return PAM_SUCCESS; |
98a28fef | 512 | } |
8c6db833 | 513 | |
98a28fef LP |
514 | _public_ PAM_EXTERN int pam_sm_close_session( |
515 | pam_handle_t *handle, | |
516 | int flags, | |
517 | int argc, const char **argv) { | |
8c6db833 | 518 | |
29d230f6 | 519 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
03976f7b | 520 | _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL; |
5f41d1f1 | 521 | const void *existing = NULL; |
75c8e3cf | 522 | const char *id; |
75c8e3cf | 523 | int r; |
8c6db833 | 524 | |
ffcfcb6b | 525 | assert(handle); |
75c8e3cf | 526 | |
77085881 LP |
527 | /* Only release session if it wasn't pre-existing when we |
528 | * tried to create it */ | |
529 | pam_get_data(handle, "systemd.existing", &existing); | |
530 | ||
75c8e3cf | 531 | id = pam_getenv(handle, "XDG_SESSION_ID"); |
77085881 | 532 | if (id && !existing) { |
75c8e3cf LP |
533 | |
534 | /* Before we go and close the FIFO we need to tell | |
535 | * logind that this is a clean session shutdown, so | |
536 | * that it doesn't just go and slaughter us | |
537 | * immediately after closing the fd */ | |
538 | ||
ffcfcb6b ZJS |
539 | r = sd_bus_open_system(&bus); |
540 | if (r < 0) { | |
5f41d1f1 LP |
541 | pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror(-r)); |
542 | return PAM_SESSION_ERR; | |
75c8e3cf LP |
543 | } |
544 | ||
ffcfcb6b ZJS |
545 | r = sd_bus_call_method(bus, |
546 | "org.freedesktop.login1", | |
547 | "/org/freedesktop/login1", | |
548 | "org.freedesktop.login1.Manager", | |
549 | "ReleaseSession", | |
550 | &error, | |
551 | NULL, | |
552 | "s", | |
553 | id); | |
554 | if (r < 0) { | |
5f41d1f1 LP |
555 | pam_syslog(handle, LOG_ERR, "Failed to release session: %s", bus_error_message(&error, r)); |
556 | return PAM_SESSION_ERR; | |
75c8e3cf LP |
557 | } |
558 | } | |
559 | ||
5f41d1f1 LP |
560 | /* Note that we are knowingly leaking the FIFO fd here. This |
561 | * way, logind can watch us die. If we closed it here it would | |
562 | * not have any clue when that is completed. Given that one | |
563 | * cannot really have multiple PAM sessions open from the same | |
564 | * process this means we will leak one FD at max. */ | |
75c8e3cf | 565 | |
5f41d1f1 | 566 | return PAM_SUCCESS; |
8c6db833 | 567 | } |