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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
8c6db833 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
8c6db833 LP |
6 | ***/ |
7 | ||
00229fe4 | 8 | #include <endian.h> |
8c6db833 LP |
9 | #include <errno.h> |
10 | #include <fcntl.h> | |
8c6db833 | 11 | #include <pwd.h> |
8c6db833 | 12 | #include <security/_pam_macros.h> |
8c6db833 LP |
13 | #include <security/pam_ext.h> |
14 | #include <security/pam_misc.h> | |
00229fe4 LP |
15 | #include <security/pam_modules.h> |
16 | #include <security/pam_modutil.h> | |
17 | #include <sys/file.h> | |
8c6db833 | 18 | |
b5efdb8a | 19 | #include "alloc-util.h" |
430f0182 | 20 | #include "audit-util.h" |
00229fe4 LP |
21 | #include "bus-common-errors.h" |
22 | #include "bus-error.h" | |
ffcfcb6b | 23 | #include "bus-util.h" |
98a28fef | 24 | #include "def.h" |
3ffd4af2 | 25 | #include "fd-util.h" |
a5c32cff | 26 | #include "fileio.h" |
f97b34a6 | 27 | #include "format-util.h" |
958b66ea | 28 | #include "hostname-util.h" |
00229fe4 LP |
29 | #include "login-util.h" |
30 | #include "macro.h" | |
6bedfcbb | 31 | #include "parse-util.h" |
df0ff127 | 32 | #include "process-util.h" |
00229fe4 LP |
33 | #include "socket-util.h" |
34 | #include "strv.h" | |
35 | #include "terminal-util.h" | |
36 | #include "util.h" | |
c9ed61e7 | 37 | #include "path-util.h" |
8c6db833 | 38 | |
baae0358 LP |
39 | static int parse_argv( |
40 | pam_handle_t *handle, | |
41 | int argc, const char **argv, | |
42 | const char **class, | |
49ebd11f | 43 | const char **type, |
baae0358 | 44 | bool *debug) { |
8c6db833 LP |
45 | |
46 | unsigned i; | |
47 | ||
48 | assert(argc >= 0); | |
49 | assert(argc == 0 || argv); | |
50 | ||
49ebd11f | 51 | for (i = 0; i < (unsigned) argc; i++) { |
fb6becb4 | 52 | if (startswith(argv[i], "class=")) { |
485507b8 MM |
53 | if (class) |
54 | *class = argv[i] + 6; | |
55 | ||
49ebd11f LP |
56 | } else if (startswith(argv[i], "type=")) { |
57 | if (type) | |
58 | *type = argv[i] + 5; | |
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]); |
49ebd11f | 75 | } |
8c6db833 | 76 | |
8c6db833 LP |
77 | return 0; |
78 | } | |
79 | ||
8c6db833 LP |
80 | static int get_user_data( |
81 | pam_handle_t *handle, | |
82 | const char **ret_username, | |
83 | struct passwd **ret_pw) { | |
84 | ||
d90b9d27 LP |
85 | const char *username = NULL; |
86 | struct passwd *pw = NULL; | |
8c6db833 LP |
87 | int r; |
88 | ||
89 | assert(handle); | |
90 | assert(ret_username); | |
91 | assert(ret_pw); | |
92 | ||
baae0358 LP |
93 | r = pam_get_user(handle, &username, NULL); |
94 | if (r != PAM_SUCCESS) { | |
95 | pam_syslog(handle, LOG_ERR, "Failed to get user name."); | |
96 | return r; | |
97 | } | |
d90b9d27 | 98 | |
baae0358 LP |
99 | if (isempty(username)) { |
100 | pam_syslog(handle, LOG_ERR, "User name not valid."); | |
101 | return PAM_AUTH_ERR; | |
8c6db833 LP |
102 | } |
103 | ||
baae0358 | 104 | pw = pam_modutil_getpwnam(handle, username); |
d90b9d27 | 105 | if (!pw) { |
8c6db833 LP |
106 | pam_syslog(handle, LOG_ERR, "Failed to get user data."); |
107 | return PAM_USER_UNKNOWN; | |
108 | } | |
109 | ||
110 | *ret_pw = pw; | |
8e24a4f8 | 111 | *ret_username = username; |
8c6db833 LP |
112 | |
113 | return PAM_SUCCESS; | |
114 | } | |
115 | ||
4d6d6518 | 116 | static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) { |
b92bea5d ZJS |
117 | union sockaddr_union sa = { |
118 | .un.sun_family = AF_UNIX, | |
119 | }; | |
baae0358 LP |
120 | _cleanup_free_ char *p = NULL, *tty = NULL; |
121 | _cleanup_close_ int fd = -1; | |
4d6d6518 | 122 | struct ucred ucred; |
baae0358 | 123 | int v, r; |
4d6d6518 LP |
124 | |
125 | assert(display); | |
4d6d6518 LP |
126 | assert(vtnr); |
127 | ||
128 | /* We deduce the X11 socket from the display name, then use | |
129 | * SO_PEERCRED to determine the X11 server process, ask for | |
130 | * the controlling tty of that and if it's a VC then we know | |
131 | * the seat and the virtual terminal. Sounds ugly, is only | |
132 | * semi-ugly. */ | |
133 | ||
134 | r = socket_from_display(display, &p); | |
135 | if (r < 0) | |
136 | return r; | |
b92bea5d | 137 | strncpy(sa.un.sun_path, p, sizeof(sa.un.sun_path)-1); |
4d6d6518 LP |
138 | |
139 | fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0); | |
b92bea5d | 140 | if (fd < 0) |
4d6d6518 | 141 | return -errno; |
4d6d6518 | 142 | |
fc2fffe7 | 143 | if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) |
4d6d6518 | 144 | return -errno; |
4d6d6518 | 145 | |
eff05270 | 146 | r = getpeercred(fd, &ucred); |
4d6d6518 | 147 | if (r < 0) |
eff05270 | 148 | return r; |
4d6d6518 LP |
149 | |
150 | r = get_ctty(ucred.pid, NULL, &tty); | |
151 | if (r < 0) | |
152 | return r; | |
153 | ||
154 | v = vtnr_from_tty(tty); | |
4d6d6518 LP |
155 | if (v < 0) |
156 | return v; | |
157 | else if (v == 0) | |
158 | return -ENOENT; | |
159 | ||
fc7985ed LP |
160 | if (seat) |
161 | *seat = "seat0"; | |
4d6d6518 LP |
162 | *vtnr = (uint32_t) v; |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
8b255ecd KS |
167 | static int export_legacy_dbus_address( |
168 | pam_handle_t *handle, | |
169 | uid_t uid, | |
170 | const char *runtime) { | |
171 | ||
8b255ecd | 172 | _cleanup_free_ char *s = NULL; |
3df49c28 DH |
173 | int r = PAM_BUF_ERR; |
174 | ||
222953e8 DR |
175 | /* FIXME: We *really* should move the access() check into the |
176 | * daemons that spawn dbus-daemon, instead of forcing | |
177 | * DBUS_SESSION_BUS_ADDRESS= here. */ | |
178 | ||
605405c6 | 179 | s = strjoin(runtime, "/bus"); |
222953e8 DR |
180 | if (!s) |
181 | goto error; | |
182 | ||
183 | if (access(s, F_OK) < 0) | |
184 | return PAM_SUCCESS; | |
185 | ||
186 | s = mfree(s); | |
15ca0a42 | 187 | if (asprintf(&s, DEFAULT_USER_BUS_ADDRESS_FMT, runtime) < 0) |
222953e8 | 188 | goto error; |
8b255ecd KS |
189 | |
190 | r = pam_misc_setenv(handle, "DBUS_SESSION_BUS_ADDRESS", s, 0); | |
3df49c28 DH |
191 | if (r != PAM_SUCCESS) |
192 | goto error; | |
1b09f548 | 193 | |
8b255ecd | 194 | return PAM_SUCCESS; |
3df49c28 DH |
195 | |
196 | error: | |
197 | pam_syslog(handle, LOG_ERR, "Failed to set bus variable."); | |
198 | return r; | |
8b255ecd KS |
199 | } |
200 | ||
98a28fef | 201 | _public_ PAM_EXTERN int pam_sm_open_session( |
8c6db833 LP |
202 | pam_handle_t *handle, |
203 | int flags, | |
204 | int argc, const char **argv) { | |
205 | ||
4afd3348 LP |
206 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
207 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; | |
d1529c9e LP |
208 | const char |
209 | *username, *id, *object_path, *runtime_path, | |
210 | *service = NULL, | |
211 | *tty = NULL, *display = NULL, | |
212 | *remote_user = NULL, *remote_host = NULL, | |
213 | *seat = NULL, | |
214 | *type = NULL, *class = NULL, | |
a4cd87e9 | 215 | *class_pam = NULL, *type_pam = NULL, *cvtnr = NULL, *desktop = NULL; |
4afd3348 | 216 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; |
d1529c9e | 217 | int session_fd = -1, existing, r; |
d1529c9e LP |
218 | bool debug = false, remote; |
219 | struct passwd *pw; | |
baae0358 LP |
220 | uint32_t vtnr = 0; |
221 | uid_t original_uid; | |
8c6db833 | 222 | |
ffcfcb6b | 223 | assert(handle); |
98a28fef | 224 | |
79d860fe MP |
225 | /* Make this a NOP on non-logind systems */ |
226 | if (!logind_running()) | |
8c6db833 LP |
227 | return PAM_SUCCESS; |
228 | ||
e9fbc77c LP |
229 | if (parse_argv(handle, |
230 | argc, argv, | |
fb6becb4 | 231 | &class_pam, |
49ebd11f | 232 | &type_pam, |
5a330cda ZJS |
233 | &debug) < 0) |
234 | return PAM_SESSION_ERR; | |
74fe1fe3 | 235 | |
baae0358 | 236 | if (debug) |
3831838a | 237 | pam_syslog(handle, LOG_DEBUG, "pam-systemd initializing"); |
baae0358 | 238 | |
98a28fef | 239 | r = get_user_data(handle, &username, &pw); |
5a330cda ZJS |
240 | if (r != PAM_SUCCESS) { |
241 | pam_syslog(handle, LOG_ERR, "Failed to get user data."); | |
242 | return r; | |
243 | } | |
8c6db833 | 244 | |
30b2c336 LP |
245 | /* Make sure we don't enter a loop by talking to |
246 | * systemd-logind when it is actually waiting for the | |
247 | * background to finish start-up. If the service is | |
5c390a4a | 248 | * "systemd-user" we simply set XDG_RUNTIME_DIR and |
30b2c336 LP |
249 | * leave. */ |
250 | ||
251 | pam_get_item(handle, PAM_SERVICE, (const void**) &service); | |
5c390a4a | 252 | if (streq_ptr(service, "systemd-user")) { |
f9e4283d | 253 | _cleanup_free_ char *rt = NULL; |
30b2c336 | 254 | |
f9e4283d | 255 | if (asprintf(&rt, "/run/user/"UID_FMT, pw->pw_uid) < 0) |
ffcfcb6b | 256 | return PAM_BUF_ERR; |
30b2c336 | 257 | |
f9e4283d DH |
258 | r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0); |
259 | if (r != PAM_SUCCESS) { | |
260 | pam_syslog(handle, LOG_ERR, "Failed to set runtime dir."); | |
261 | return r; | |
30b2c336 LP |
262 | } |
263 | ||
f9e4283d DH |
264 | r = export_legacy_dbus_address(handle, pw->pw_uid, rt); |
265 | if (r != PAM_SUCCESS) | |
266 | return r; | |
267 | ||
ffcfcb6b | 268 | return PAM_SUCCESS; |
8c6db833 LP |
269 | } |
270 | ||
ffcfcb6b | 271 | /* Otherwise, we ask logind to create a session for us */ |
8c6db833 | 272 | |
98a28fef LP |
273 | pam_get_item(handle, PAM_XDISPLAY, (const void**) &display); |
274 | pam_get_item(handle, PAM_TTY, (const void**) &tty); | |
275 | pam_get_item(handle, PAM_RUSER, (const void**) &remote_user); | |
276 | pam_get_item(handle, PAM_RHOST, (const void**) &remote_host); | |
a8573ccc | 277 | |
bbc73283 | 278 | seat = pam_getenv(handle, "XDG_SEAT"); |
a8573ccc LP |
279 | if (isempty(seat)) |
280 | seat = getenv("XDG_SEAT"); | |
281 | ||
bbc73283 | 282 | cvtnr = pam_getenv(handle, "XDG_VTNR"); |
a8573ccc LP |
283 | if (isempty(cvtnr)) |
284 | cvtnr = getenv("XDG_VTNR"); | |
98a28fef | 285 | |
49ebd11f LP |
286 | type = pam_getenv(handle, "XDG_SESSION_TYPE"); |
287 | if (isempty(type)) | |
288 | type = getenv("XDG_SESSION_TYPE"); | |
289 | if (isempty(type)) | |
290 | type = type_pam; | |
291 | ||
292 | class = pam_getenv(handle, "XDG_SESSION_CLASS"); | |
293 | if (isempty(class)) | |
294 | class = getenv("XDG_SESSION_CLASS"); | |
295 | if (isempty(class)) | |
296 | class = class_pam; | |
297 | ||
a4cd87e9 LP |
298 | desktop = pam_getenv(handle, "XDG_SESSION_DESKTOP"); |
299 | if (isempty(desktop)) | |
300 | desktop = getenv("XDG_SESSION_DESKTOP"); | |
301 | ||
ed18b08b | 302 | tty = strempty(tty); |
98a28fef | 303 | |
ee8545b0 | 304 | if (strchr(tty, ':')) { |
e2acb67b LP |
305 | /* A tty with a colon is usually an X11 display, |
306 | * placed there to show up in utmp. We rearrange | |
307 | * things and don't pretend that an X display was a | |
308 | * tty. */ | |
ee8545b0 LP |
309 | |
310 | if (isempty(display)) | |
311 | display = tty; | |
a4cd87e9 | 312 | tty = NULL; |
1a4459d6 | 313 | } else if (streq(tty, "cron")) { |
0ad1271f LP |
314 | /* cron has been setting PAM_TTY to "cron" for a very |
315 | * long time and it probably shouldn't stop doing that | |
316 | * for compatibility reasons. */ | |
0ad1271f | 317 | type = "unspecified"; |
49ebd11f | 318 | class = "background"; |
a4cd87e9 | 319 | tty = NULL; |
0ad1271f LP |
320 | } else if (streq(tty, "ssh")) { |
321 | /* ssh has been setting PAM_TTY to "ssh" for a very | |
322 | * long time and probably shouldn't stop doing that | |
323 | * for compatibility reasons. */ | |
0ad1271f | 324 | type ="tty"; |
49ebd11f | 325 | class = "user"; |
a4cd87e9 | 326 | tty = NULL; |
c9ed61e7 LP |
327 | } else |
328 | /* Chop off leading /dev prefix that some clients specify, but others do not. */ | |
329 | tty = skip_dev_prefix(tty); | |
ee8545b0 | 330 | |
8e7705e5 | 331 | /* If this fails vtnr will be 0, that's intended */ |
4d6d6518 | 332 | if (!isempty(cvtnr)) |
2ae4842b | 333 | (void) safe_atou32(cvtnr, &vtnr); |
4d6d6518 | 334 | |
92bd5ff3 | 335 | if (!isempty(display) && !vtnr) { |
fc7985ed | 336 | if (isempty(seat)) |
6ef25fb6 | 337 | get_seat_from_display(display, &seat, &vtnr); |
fc7985ed | 338 | else if (streq(seat, "seat0")) |
6ef25fb6 | 339 | get_seat_from_display(display, NULL, &vtnr); |
fc7985ed | 340 | } |
4d6d6518 | 341 | |
49ebd11f | 342 | if (seat && !streq(seat, "seat0") && vtnr != 0) { |
1fa2f38f | 343 | pam_syslog(handle, LOG_DEBUG, "Ignoring vtnr %"PRIu32" for %s which is not seat0", vtnr, seat); |
d7353ef6 MM |
344 | vtnr = 0; |
345 | } | |
346 | ||
49ebd11f | 347 | if (isempty(type)) |
0ad1271f | 348 | type = !isempty(display) ? "x11" : |
49ebd11f | 349 | !isempty(tty) ? "tty" : "unspecified"; |
98a28fef | 350 | |
55efac6c | 351 | if (isempty(class)) |
e2acb67b | 352 | class = streq(type, "unspecified") ? "background" : "user"; |
55efac6c | 353 | |
fecc80c1 | 354 | remote = !isempty(remote_host) && !is_localhost(remote_host); |
98a28fef | 355 | |
4d49b48c | 356 | /* Talk to logind over the message bus */ |
5a330cda | 357 | |
ffcfcb6b ZJS |
358 | r = sd_bus_open_system(&bus); |
359 | if (r < 0) { | |
360 | pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror(-r)); | |
361 | return PAM_SESSION_ERR; | |
cc377381 LP |
362 | } |
363 | ||
ce959314 MS |
364 | if (debug) |
365 | pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: " | |
1fa2f38f | 366 | "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", |
df0ff127 | 367 | pw->pw_uid, getpid_cached(), |
baae0358 | 368 | strempty(service), |
cda7ecb0 | 369 | type, class, strempty(desktop), |
a4cd87e9 | 370 | strempty(seat), vtnr, strempty(tty), strempty(display), |
baae0358 | 371 | yes_no(remote), strempty(remote_user), strempty(remote_host)); |
ce959314 | 372 | |
ffcfcb6b ZJS |
373 | r = sd_bus_call_method(bus, |
374 | "org.freedesktop.login1", | |
375 | "/org/freedesktop/login1", | |
376 | "org.freedesktop.login1.Manager", | |
377 | "CreateSession", | |
378 | &error, | |
379 | &reply, | |
a4cd87e9 | 380 | "uusssssussbssa(sv)", |
baae0358 | 381 | (uint32_t) pw->pw_uid, |
df0ff127 | 382 | (uint32_t) getpid_cached(), |
a4cd87e9 | 383 | service, |
ffcfcb6b ZJS |
384 | type, |
385 | class, | |
a4cd87e9 LP |
386 | desktop, |
387 | seat, | |
ffcfcb6b ZJS |
388 | vtnr, |
389 | tty, | |
a4cd87e9 | 390 | display, |
ffcfcb6b | 391 | remote, |
a4cd87e9 LP |
392 | remote_user, |
393 | remote_host, | |
ffcfcb6b ZJS |
394 | 0); |
395 | if (r < 0) { | |
b80120c4 DH |
396 | if (sd_bus_error_has_name(&error, BUS_ERROR_SESSION_BUSY)) { |
397 | pam_syslog(handle, LOG_DEBUG, "Cannot create session: %s", bus_error_message(&error, r)); | |
398 | return PAM_SUCCESS; | |
399 | } else { | |
400 | pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error, r)); | |
401 | return PAM_SYSTEM_ERR; | |
402 | } | |
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 | ||
23e096cc | 481 | r = pam_set_data(handle, "systemd.session-fd", FD_TO_PTR(session_fd), NULL); |
21c390cc LP |
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 | |
4afd3348 LP |
497 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
498 | _cleanup_(sd_bus_flush_close_unrefp) 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 | } |