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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
8c6db833 | 2 | |
00229fe4 | 3 | #include <endian.h> |
8c6db833 LP |
4 | #include <errno.h> |
5 | #include <fcntl.h> | |
8c6db833 | 6 | #include <pwd.h> |
8c6db833 | 7 | #include <security/_pam_macros.h> |
8c6db833 LP |
8 | #include <security/pam_ext.h> |
9 | #include <security/pam_misc.h> | |
00229fe4 LP |
10 | #include <security/pam_modules.h> |
11 | #include <security/pam_modutil.h> | |
12 | #include <sys/file.h> | |
8c6db833 | 13 | |
b5efdb8a | 14 | #include "alloc-util.h" |
430f0182 | 15 | #include "audit-util.h" |
00229fe4 LP |
16 | #include "bus-common-errors.h" |
17 | #include "bus-error.h" | |
ffcfcb6b | 18 | #include "bus-util.h" |
e37e5ed3 | 19 | #include "cgroup-util.h" |
98a28fef | 20 | #include "def.h" |
3ffd4af2 | 21 | #include "fd-util.h" |
a5c32cff | 22 | #include "fileio.h" |
f97b34a6 | 23 | #include "format-util.h" |
958b66ea | 24 | #include "hostname-util.h" |
00229fe4 LP |
25 | #include "login-util.h" |
26 | #include "macro.h" | |
6bedfcbb | 27 | #include "parse-util.h" |
e37e5ed3 | 28 | #include "path-util.h" |
df0ff127 | 29 | #include "process-util.h" |
00229fe4 | 30 | #include "socket-util.h" |
055c08ef | 31 | #include "stdio-util.h" |
00229fe4 LP |
32 | #include "strv.h" |
33 | #include "terminal-util.h" | |
34 | #include "util.h" | |
8c6db833 | 35 | |
baae0358 LP |
36 | static int parse_argv( |
37 | pam_handle_t *handle, | |
38 | int argc, const char **argv, | |
39 | const char **class, | |
49ebd11f | 40 | const char **type, |
f5cb2820 | 41 | const char **desktop, |
baae0358 | 42 | bool *debug) { |
8c6db833 LP |
43 | |
44 | unsigned i; | |
45 | ||
46 | assert(argc >= 0); | |
47 | assert(argc == 0 || argv); | |
48 | ||
49ebd11f | 49 | for (i = 0; i < (unsigned) argc; i++) { |
fb6becb4 | 50 | if (startswith(argv[i], "class=")) { |
485507b8 MM |
51 | if (class) |
52 | *class = argv[i] + 6; | |
53 | ||
49ebd11f LP |
54 | } else if (startswith(argv[i], "type=")) { |
55 | if (type) | |
56 | *type = argv[i] + 5; | |
57 | ||
f5cb2820 LP |
58 | } else if (startswith(argv[i], "desktop=")) { |
59 | if (desktop) | |
60 | *desktop = argv[i] + 8; | |
61 | ||
05a049cc ZJS |
62 | } else if (streq(argv[i], "debug")) { |
63 | if (debug) | |
64 | *debug = true; | |
fb6becb4 | 65 | |
05a049cc ZJS |
66 | } else if (startswith(argv[i], "debug=")) { |
67 | int k; | |
0e318cad | 68 | |
05a049cc ZJS |
69 | k = parse_boolean(argv[i] + 6); |
70 | if (k < 0) | |
71 | pam_syslog(handle, LOG_WARNING, "Failed to parse debug= argument, ignoring."); | |
72 | else if (debug) | |
0e318cad MS |
73 | *debug = k; |
74 | ||
05a049cc | 75 | } else |
fb6becb4 | 76 | pam_syslog(handle, LOG_WARNING, "Unknown parameter '%s', ignoring", argv[i]); |
49ebd11f | 77 | } |
8c6db833 | 78 | |
8c6db833 LP |
79 | return 0; |
80 | } | |
81 | ||
8c6db833 LP |
82 | static int get_user_data( |
83 | pam_handle_t *handle, | |
84 | const char **ret_username, | |
85 | struct passwd **ret_pw) { | |
86 | ||
d90b9d27 LP |
87 | const char *username = NULL; |
88 | struct passwd *pw = NULL; | |
8c6db833 LP |
89 | int r; |
90 | ||
91 | assert(handle); | |
92 | assert(ret_username); | |
93 | assert(ret_pw); | |
94 | ||
baae0358 LP |
95 | r = pam_get_user(handle, &username, NULL); |
96 | if (r != PAM_SUCCESS) { | |
97 | pam_syslog(handle, LOG_ERR, "Failed to get user name."); | |
98 | return r; | |
99 | } | |
d90b9d27 | 100 | |
baae0358 LP |
101 | if (isempty(username)) { |
102 | pam_syslog(handle, LOG_ERR, "User name not valid."); | |
103 | return PAM_AUTH_ERR; | |
8c6db833 LP |
104 | } |
105 | ||
baae0358 | 106 | pw = pam_modutil_getpwnam(handle, username); |
d90b9d27 | 107 | if (!pw) { |
8c6db833 LP |
108 | pam_syslog(handle, LOG_ERR, "Failed to get user data."); |
109 | return PAM_USER_UNKNOWN; | |
110 | } | |
111 | ||
112 | *ret_pw = pw; | |
8e24a4f8 | 113 | *ret_username = username; |
8c6db833 LP |
114 | |
115 | return PAM_SUCCESS; | |
116 | } | |
117 | ||
f7b8b5c4 LP |
118 | static int socket_from_display(const char *display, char **path) { |
119 | size_t k; | |
120 | char *f, *c; | |
121 | ||
122 | assert(display); | |
123 | assert(path); | |
124 | ||
125 | if (!display_is_local(display)) | |
126 | return -EINVAL; | |
127 | ||
128 | k = strspn(display+1, "0123456789"); | |
129 | ||
130 | f = new(char, STRLEN("/tmp/.X11-unix/X") + k + 1); | |
131 | if (!f) | |
132 | return -ENOMEM; | |
133 | ||
134 | c = stpcpy(f, "/tmp/.X11-unix/X"); | |
135 | memcpy(c, display+1, k); | |
136 | c[k] = 0; | |
137 | ||
138 | *path = f; | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
4d6d6518 | 143 | static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) { |
15a3e96f | 144 | union sockaddr_union sa = {}; |
baae0358 LP |
145 | _cleanup_free_ char *p = NULL, *tty = NULL; |
146 | _cleanup_close_ int fd = -1; | |
4d6d6518 | 147 | struct ucred ucred; |
15a3e96f | 148 | int v, r, salen; |
4d6d6518 LP |
149 | |
150 | assert(display); | |
4d6d6518 LP |
151 | assert(vtnr); |
152 | ||
153 | /* We deduce the X11 socket from the display name, then use | |
154 | * SO_PEERCRED to determine the X11 server process, ask for | |
155 | * the controlling tty of that and if it's a VC then we know | |
156 | * the seat and the virtual terminal. Sounds ugly, is only | |
157 | * semi-ugly. */ | |
158 | ||
159 | r = socket_from_display(display, &p); | |
160 | if (r < 0) | |
161 | return r; | |
15a3e96f LP |
162 | salen = sockaddr_un_set_path(&sa.un, p); |
163 | if (salen < 0) | |
164 | return salen; | |
4d6d6518 LP |
165 | |
166 | fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0); | |
b92bea5d | 167 | if (fd < 0) |
4d6d6518 | 168 | return -errno; |
4d6d6518 | 169 | |
15a3e96f | 170 | if (connect(fd, &sa.sa, salen) < 0) |
4d6d6518 | 171 | return -errno; |
4d6d6518 | 172 | |
eff05270 | 173 | r = getpeercred(fd, &ucred); |
4d6d6518 | 174 | if (r < 0) |
eff05270 | 175 | return r; |
4d6d6518 LP |
176 | |
177 | r = get_ctty(ucred.pid, NULL, &tty); | |
178 | if (r < 0) | |
179 | return r; | |
180 | ||
181 | v = vtnr_from_tty(tty); | |
4d6d6518 LP |
182 | if (v < 0) |
183 | return v; | |
184 | else if (v == 0) | |
185 | return -ENOENT; | |
186 | ||
fc7985ed LP |
187 | if (seat) |
188 | *seat = "seat0"; | |
4d6d6518 LP |
189 | *vtnr = (uint32_t) v; |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
00efd498 ZJS |
194 | static int export_legacy_dbus_address( |
195 | pam_handle_t *handle, | |
196 | uid_t uid, | |
197 | const char *runtime) { | |
198 | ||
15ee6c20 ZJS |
199 | const char *s; |
200 | _cleanup_free_ char *t = NULL; | |
00efd498 ZJS |
201 | int r = PAM_BUF_ERR; |
202 | ||
15ee6c20 ZJS |
203 | /* We need to export $DBUS_SESSION_BUS_ADDRESS because various applications will not connect |
204 | * correctly to the bus without it. This setting matches what dbus.socket does for the user | |
205 | * session using 'systemctl --user set-environment'. We want to have the same configuration | |
206 | * in processes started from the PAM session. | |
207 | * | |
208 | * The setting of the address is guarded by the access() check because it is also possible to compile | |
209 | * dbus without --enable-user-session, in which case this socket is not used, and | |
210 | * $DBUS_SESSION_BUS_ADDRESS should not be set. An alternative approach would to not do the access() | |
211 | * check here, and let applications try on their own, by using "unix:path=%s/bus;autolaunch:". But we | |
212 | * expect the socket to be present by the time we do this check, so we can just as well check once | |
213 | * here. */ | |
214 | ||
215 | s = strjoina(runtime, "/bus"); | |
216 | if (access(s, F_OK) < 0) | |
217 | return PAM_SUCCESS; | |
218 | ||
219 | if (asprintf(&t, DEFAULT_USER_BUS_ADDRESS_FMT, runtime) < 0) | |
00efd498 ZJS |
220 | goto error; |
221 | ||
15ee6c20 | 222 | r = pam_misc_setenv(handle, "DBUS_SESSION_BUS_ADDRESS", t, 0); |
00efd498 ZJS |
223 | if (r != PAM_SUCCESS) |
224 | goto error; | |
225 | ||
226 | return PAM_SUCCESS; | |
227 | ||
228 | error: | |
229 | pam_syslog(handle, LOG_ERR, "Failed to set bus variable."); | |
230 | return r; | |
231 | } | |
232 | ||
22f93314 JS |
233 | static int append_session_memory_max(pam_handle_t *handle, sd_bus_message *m, const char *limit) { |
234 | uint64_t val; | |
235 | int r; | |
236 | ||
237 | if (isempty(limit)) | |
238 | return 0; | |
239 | ||
240 | if (streq(limit, "infinity")) { | |
241 | r = sd_bus_message_append(m, "(sv)", "MemoryMax", "t", (uint64_t)-1); | |
242 | if (r < 0) { | |
243 | pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror(-r)); | |
244 | return r; | |
245 | } | |
246 | } else { | |
f806dfd3 | 247 | r = parse_permille(limit); |
22f93314 | 248 | if (r >= 0) { |
f806dfd3 | 249 | r = sd_bus_message_append(m, "(sv)", "MemoryMaxScale", "u", (uint32_t) (((uint64_t) r * UINT32_MAX) / 1000U)); |
22f93314 JS |
250 | if (r < 0) { |
251 | pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror(-r)); | |
252 | return r; | |
253 | } | |
254 | } else { | |
255 | r = parse_size(limit, 1024, &val); | |
256 | if (r >= 0) { | |
257 | r = sd_bus_message_append(m, "(sv)", "MemoryMax", "t", val); | |
258 | if (r < 0) { | |
259 | pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror(-r)); | |
260 | return r; | |
261 | } | |
262 | } else | |
263 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.limit: %s, ignoring.", limit); | |
264 | } | |
265 | } | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
5fdfbbd5 | 270 | static int append_session_tasks_max(pam_handle_t *handle, sd_bus_message *m, const char *limit) { |
22f93314 JS |
271 | uint64_t val; |
272 | int r; | |
273 | ||
274 | /* No need to parse "infinity" here, it will be set unconditionally later in manager_start_scope() */ | |
275 | if (isempty(limit) || streq(limit, "infinity")) | |
276 | return 0; | |
277 | ||
278 | r = safe_atou64(limit, &val); | |
279 | if (r >= 0) { | |
280 | r = sd_bus_message_append(m, "(sv)", "TasksMax", "t", val); | |
281 | if (r < 0) { | |
282 | pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror(-r)); | |
283 | return r; | |
284 | } | |
285 | } else | |
286 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.limit: %s, ignoring.", limit); | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | static int append_session_cg_weight(pam_handle_t *handle, sd_bus_message *m, const char *limit, const char *field) { | |
292 | uint64_t val; | |
293 | int r; | |
294 | ||
36a4dbae LP |
295 | if (isempty(limit)) |
296 | return 0; | |
297 | ||
298 | r = cg_weight_parse(limit, &val); | |
299 | if (r >= 0) { | |
300 | r = sd_bus_message_append(m, "(sv)", field, "t", val); | |
301 | if (r < 0) { | |
302 | pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror(-r)); | |
303 | return r; | |
304 | } | |
305 | } else if (streq(field, "CPUWeight")) | |
306 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.cpu_weight: %s, ignoring.", limit); | |
307 | else | |
308 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.io_weight: %s, ignoring.", limit); | |
22f93314 JS |
309 | |
310 | return 0; | |
311 | } | |
312 | ||
0ecc1c9d LP |
313 | static const char* getenv_harder(pam_handle_t *handle, const char *key, const char *fallback) { |
314 | const char *v; | |
315 | ||
316 | assert(handle); | |
317 | assert(key); | |
318 | ||
319 | /* Looks for an environment variable, preferrably in the environment block associated with the specified PAM | |
320 | * handle, falling back to the process' block instead. */ | |
321 | ||
322 | v = pam_getenv(handle, key); | |
323 | if (!isempty(v)) | |
324 | return v; | |
325 | ||
326 | v = getenv(key); | |
327 | if (!isempty(v)) | |
328 | return v; | |
329 | ||
330 | return fallback; | |
331 | } | |
332 | ||
d6baaa69 LP |
333 | static int update_environment(pam_handle_t *handle, const char *key, const char *value) { |
334 | int r; | |
335 | ||
336 | assert(handle); | |
337 | assert(key); | |
338 | ||
339 | /* Updates the environment, but only if there's actually a value set. Also, log about errors */ | |
340 | ||
341 | if (isempty(value)) | |
342 | return PAM_SUCCESS; | |
343 | ||
344 | r = pam_misc_setenv(handle, key, value, 0); | |
345 | if (r != PAM_SUCCESS) | |
346 | pam_syslog(handle, LOG_ERR, "Failed to set environment variable %s.", key); | |
347 | ||
348 | return r; | |
349 | } | |
350 | ||
b9217112 LP |
351 | static bool validate_runtime_directory(pam_handle_t *handle, const char *path, uid_t uid) { |
352 | struct stat st; | |
353 | ||
354 | assert(path); | |
355 | ||
356 | /* Just some extra paranoia: let's not set $XDG_RUNTIME_DIR if the directory we'd set it to isn't actually set | |
357 | * up properly for us. */ | |
358 | ||
359 | if (lstat(path, &st) < 0) { | |
360 | pam_syslog(handle, LOG_ERR, "Failed to stat() runtime directory '%s': %s", path, strerror(errno)); | |
361 | goto fail; | |
362 | } | |
363 | ||
364 | if (!S_ISDIR(st.st_mode)) { | |
365 | pam_syslog(handle, LOG_ERR, "Runtime directory '%s' is not actually a directory.", path); | |
366 | goto fail; | |
367 | } | |
368 | ||
369 | if (st.st_uid != uid) { | |
370 | pam_syslog(handle, LOG_ERR, "Runtime directory '%s' is not owned by UID " UID_FMT ", as it should.", path, uid); | |
371 | goto fail; | |
372 | } | |
373 | ||
374 | return true; | |
375 | ||
376 | fail: | |
377 | pam_syslog(handle, LOG_WARNING, "Not setting $XDG_RUNTIME_DIR, as the directory is not in order."); | |
378 | return false; | |
379 | } | |
380 | ||
98a28fef | 381 | _public_ PAM_EXTERN int pam_sm_open_session( |
8c6db833 LP |
382 | pam_handle_t *handle, |
383 | int flags, | |
384 | int argc, const char **argv) { | |
385 | ||
4afd3348 | 386 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
22f93314 | 387 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL; |
d1529c9e LP |
388 | const char |
389 | *username, *id, *object_path, *runtime_path, | |
390 | *service = NULL, | |
391 | *tty = NULL, *display = NULL, | |
392 | *remote_user = NULL, *remote_host = NULL, | |
393 | *seat = NULL, | |
394 | *type = NULL, *class = NULL, | |
f5cb2820 | 395 | *class_pam = NULL, *type_pam = NULL, *cvtnr = NULL, *desktop = NULL, *desktop_pam = NULL, |
22f93314 | 396 | *memory_max = NULL, *tasks_max = NULL, *cpu_weight = NULL, *io_weight = NULL; |
4afd3348 | 397 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; |
d1529c9e | 398 | int session_fd = -1, existing, r; |
d1529c9e LP |
399 | bool debug = false, remote; |
400 | struct passwd *pw; | |
baae0358 LP |
401 | uint32_t vtnr = 0; |
402 | uid_t original_uid; | |
8c6db833 | 403 | |
ffcfcb6b | 404 | assert(handle); |
98a28fef | 405 | |
79d860fe MP |
406 | /* Make this a NOP on non-logind systems */ |
407 | if (!logind_running()) | |
8c6db833 LP |
408 | return PAM_SUCCESS; |
409 | ||
e9fbc77c LP |
410 | if (parse_argv(handle, |
411 | argc, argv, | |
fb6becb4 | 412 | &class_pam, |
49ebd11f | 413 | &type_pam, |
f5cb2820 | 414 | &desktop_pam, |
5a330cda ZJS |
415 | &debug) < 0) |
416 | return PAM_SESSION_ERR; | |
74fe1fe3 | 417 | |
baae0358 | 418 | if (debug) |
3831838a | 419 | pam_syslog(handle, LOG_DEBUG, "pam-systemd initializing"); |
baae0358 | 420 | |
98a28fef | 421 | r = get_user_data(handle, &username, &pw); |
5a330cda ZJS |
422 | if (r != PAM_SUCCESS) { |
423 | pam_syslog(handle, LOG_ERR, "Failed to get user data."); | |
424 | return r; | |
425 | } | |
8c6db833 | 426 | |
30b2c336 LP |
427 | /* Make sure we don't enter a loop by talking to |
428 | * systemd-logind when it is actually waiting for the | |
429 | * background to finish start-up. If the service is | |
5c390a4a | 430 | * "systemd-user" we simply set XDG_RUNTIME_DIR and |
30b2c336 LP |
431 | * leave. */ |
432 | ||
433 | pam_get_item(handle, PAM_SERVICE, (const void**) &service); | |
5c390a4a | 434 | if (streq_ptr(service, "systemd-user")) { |
055c08ef | 435 | char rt[STRLEN("/run/user/") + DECIMAL_STR_MAX(uid_t)]; |
30b2c336 | 436 | |
055c08ef | 437 | xsprintf(rt, "/run/user/"UID_FMT, pw->pw_uid); |
b9217112 LP |
438 | if (validate_runtime_directory(handle, rt, pw->pw_uid)) { |
439 | r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0); | |
440 | if (r != PAM_SUCCESS) { | |
441 | pam_syslog(handle, LOG_ERR, "Failed to set runtime dir."); | |
442 | return r; | |
443 | } | |
30b2c336 LP |
444 | } |
445 | ||
00efd498 ZJS |
446 | r = export_legacy_dbus_address(handle, pw->pw_uid, rt); |
447 | if (r != PAM_SUCCESS) | |
448 | return r; | |
449 | ||
ffcfcb6b | 450 | return PAM_SUCCESS; |
8c6db833 LP |
451 | } |
452 | ||
ffcfcb6b | 453 | /* Otherwise, we ask logind to create a session for us */ |
8c6db833 | 454 | |
98a28fef LP |
455 | pam_get_item(handle, PAM_XDISPLAY, (const void**) &display); |
456 | pam_get_item(handle, PAM_TTY, (const void**) &tty); | |
457 | pam_get_item(handle, PAM_RUSER, (const void**) &remote_user); | |
458 | pam_get_item(handle, PAM_RHOST, (const void**) &remote_host); | |
a8573ccc | 459 | |
0ecc1c9d LP |
460 | seat = getenv_harder(handle, "XDG_SEAT", NULL); |
461 | cvtnr = getenv_harder(handle, "XDG_VTNR", NULL); | |
462 | type = getenv_harder(handle, "XDG_SESSION_TYPE", type_pam); | |
463 | class = getenv_harder(handle, "XDG_SESSION_CLASS", class_pam); | |
f5cb2820 | 464 | desktop = getenv_harder(handle, "XDG_SESSION_DESKTOP", desktop_pam); |
a4cd87e9 | 465 | |
ed18b08b | 466 | tty = strempty(tty); |
98a28fef | 467 | |
ee8545b0 | 468 | if (strchr(tty, ':')) { |
3a736949 LP |
469 | /* A tty with a colon is usually an X11 display, placed there to show up in utmp. We rearrange things |
470 | * and don't pretend that an X display was a tty. */ | |
ee8545b0 LP |
471 | if (isempty(display)) |
472 | display = tty; | |
a4cd87e9 | 473 | tty = NULL; |
3a736949 | 474 | |
1a4459d6 | 475 | } else if (streq(tty, "cron")) { |
3a736949 LP |
476 | /* cron is setting PAM_TTY to "cron" for some reason (the commit carries no information why, but |
477 | * probably because it wants to set it to something as pam_time/pam_access/… require PAM_TTY to be set | |
478 | * (as they otherwise even try to update it!) — but cron doesn't actually allocate a TTY for its forked | |
479 | * off processes.) */ | |
0ad1271f | 480 | type = "unspecified"; |
49ebd11f | 481 | class = "background"; |
a4cd87e9 | 482 | tty = NULL; |
3a736949 | 483 | |
0ad1271f | 484 | } else if (streq(tty, "ssh")) { |
3a736949 LP |
485 | /* ssh has been setting PAM_TTY to "ssh" (for the same reason as cron does this, see above. For further |
486 | * details look for "PAM_TTY_KLUDGE" in the openssh sources). */ | |
0ad1271f | 487 | type ="tty"; |
49ebd11f | 488 | class = "user"; |
3a736949 LP |
489 | tty = NULL; /* This one is particularly sad, as this means that ssh sessions — even though usually |
490 | * associated with a pty — won't be tracked by their tty in logind. This is because ssh | |
491 | * does the PAM session registration early for new connections, and registers a pty only | |
492 | * much later (this is because it doesn't know yet if it needs one at all, as whether to | |
493 | * register a pty or not is negotiated much later in the protocol). */ | |
494 | ||
c9ed61e7 LP |
495 | } else |
496 | /* Chop off leading /dev prefix that some clients specify, but others do not. */ | |
497 | tty = skip_dev_prefix(tty); | |
ee8545b0 | 498 | |
8e7705e5 | 499 | /* If this fails vtnr will be 0, that's intended */ |
4d6d6518 | 500 | if (!isempty(cvtnr)) |
2ae4842b | 501 | (void) safe_atou32(cvtnr, &vtnr); |
4d6d6518 | 502 | |
92bd5ff3 | 503 | if (!isempty(display) && !vtnr) { |
fc7985ed | 504 | if (isempty(seat)) |
d487e2d6 | 505 | (void) get_seat_from_display(display, &seat, &vtnr); |
fc7985ed | 506 | else if (streq(seat, "seat0")) |
d487e2d6 | 507 | (void) get_seat_from_display(display, NULL, &vtnr); |
fc7985ed | 508 | } |
4d6d6518 | 509 | |
49ebd11f | 510 | if (seat && !streq(seat, "seat0") && vtnr != 0) { |
2675747f LP |
511 | if (debug) |
512 | pam_syslog(handle, LOG_DEBUG, "Ignoring vtnr %"PRIu32" for %s which is not seat0", vtnr, seat); | |
d7353ef6 MM |
513 | vtnr = 0; |
514 | } | |
515 | ||
49ebd11f | 516 | if (isempty(type)) |
0ad1271f | 517 | type = !isempty(display) ? "x11" : |
49ebd11f | 518 | !isempty(tty) ? "tty" : "unspecified"; |
98a28fef | 519 | |
55efac6c | 520 | if (isempty(class)) |
e2acb67b | 521 | class = streq(type, "unspecified") ? "background" : "user"; |
55efac6c | 522 | |
fecc80c1 | 523 | remote = !isempty(remote_host) && !is_localhost(remote_host); |
98a28fef | 524 | |
22f93314 JS |
525 | (void) pam_get_data(handle, "systemd.memory_max", (const void **)&memory_max); |
526 | (void) pam_get_data(handle, "systemd.tasks_max", (const void **)&tasks_max); | |
527 | (void) pam_get_data(handle, "systemd.cpu_weight", (const void **)&cpu_weight); | |
528 | (void) pam_get_data(handle, "systemd.io_weight", (const void **)&io_weight); | |
529 | ||
4d49b48c | 530 | /* Talk to logind over the message bus */ |
5a330cda | 531 | |
ffcfcb6b ZJS |
532 | r = sd_bus_open_system(&bus); |
533 | if (r < 0) { | |
534 | pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror(-r)); | |
535 | return PAM_SESSION_ERR; | |
cc377381 LP |
536 | } |
537 | ||
22f93314 | 538 | if (debug) { |
ce959314 | 539 | pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: " |
1fa2f38f | 540 | "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 | 541 | pw->pw_uid, getpid_cached(), |
baae0358 | 542 | strempty(service), |
cda7ecb0 | 543 | type, class, strempty(desktop), |
a4cd87e9 | 544 | strempty(seat), vtnr, strempty(tty), strempty(display), |
baae0358 | 545 | yes_no(remote), strempty(remote_user), strempty(remote_host)); |
22f93314 JS |
546 | pam_syslog(handle, LOG_DEBUG, "Session limits: " |
547 | "memory_max=%s tasks_max=%s cpu_weight=%s io_weight=%s", | |
548 | strna(memory_max), strna(tasks_max), strna(cpu_weight), strna(io_weight)); | |
549 | } | |
550 | ||
551 | r = sd_bus_message_new_method_call( | |
552 | bus, | |
553 | &m, | |
554 | "org.freedesktop.login1", | |
555 | "/org/freedesktop/login1", | |
556 | "org.freedesktop.login1.Manager", | |
557 | "CreateSession"); | |
558 | if (r < 0) { | |
559 | pam_syslog(handle, LOG_ERR, "Failed to create CreateSession method call: %s", strerror(-r)); | |
560 | return PAM_SESSION_ERR; | |
561 | } | |
562 | ||
563 | r = sd_bus_message_append(m, "uusssssussbss", | |
564 | (uint32_t) pw->pw_uid, | |
da0da5ec | 565 | 0, |
22f93314 JS |
566 | service, |
567 | type, | |
568 | class, | |
569 | desktop, | |
570 | seat, | |
571 | vtnr, | |
572 | tty, | |
573 | display, | |
574 | remote, | |
575 | remote_user, | |
576 | remote_host); | |
577 | if (r < 0) { | |
578 | pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror(-r)); | |
579 | return PAM_SESSION_ERR; | |
580 | } | |
581 | ||
582 | r = sd_bus_message_open_container(m, 'a', "(sv)"); | |
583 | if (r < 0) { | |
584 | pam_syslog(handle, LOG_ERR, "Failed to open message container: %s", strerror(-r)); | |
585 | return PAM_SYSTEM_ERR; | |
586 | } | |
587 | ||
588 | r = append_session_memory_max(handle, m, memory_max); | |
589 | if (r < 0) | |
590 | return PAM_SESSION_ERR; | |
591 | ||
592 | r = append_session_tasks_max(handle, m, tasks_max); | |
593 | if (r < 0) | |
594 | return PAM_SESSION_ERR; | |
595 | ||
596 | r = append_session_cg_weight(handle, m, cpu_weight, "CPUWeight"); | |
597 | if (r < 0) | |
598 | return PAM_SESSION_ERR; | |
599 | ||
600 | r = append_session_cg_weight(handle, m, io_weight, "IOWeight"); | |
601 | if (r < 0) | |
602 | return PAM_SESSION_ERR; | |
603 | ||
604 | r = sd_bus_message_close_container(m); | |
605 | if (r < 0) { | |
606 | pam_syslog(handle, LOG_ERR, "Failed to close message container: %s", strerror(-r)); | |
607 | return PAM_SYSTEM_ERR; | |
608 | } | |
ce959314 | 609 | |
22f93314 | 610 | r = sd_bus_call(bus, m, 0, &error, &reply); |
ffcfcb6b | 611 | if (r < 0) { |
b80120c4 | 612 | if (sd_bus_error_has_name(&error, BUS_ERROR_SESSION_BUSY)) { |
2675747f | 613 | if (debug) |
c7e93c4d | 614 | pam_syslog(handle, LOG_DEBUG, "Not creating session: %s", bus_error_message(&error, r)); |
b80120c4 DH |
615 | return PAM_SUCCESS; |
616 | } else { | |
617 | pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error, r)); | |
618 | return PAM_SYSTEM_ERR; | |
619 | } | |
98a28fef | 620 | } |
74fe1fe3 | 621 | |
ffcfcb6b | 622 | r = sd_bus_message_read(reply, |
baae0358 | 623 | "soshusub", |
ffcfcb6b ZJS |
624 | &id, |
625 | &object_path, | |
626 | &runtime_path, | |
627 | &session_fd, | |
baae0358 | 628 | &original_uid, |
ffcfcb6b ZJS |
629 | &seat, |
630 | &vtnr, | |
631 | &existing); | |
632 | if (r < 0) { | |
633 | pam_syslog(handle, LOG_ERR, "Failed to parse message: %s", strerror(-r)); | |
5a330cda | 634 | return PAM_SESSION_ERR; |
98a28fef | 635 | } |
74fe1fe3 | 636 | |
ce959314 MS |
637 | if (debug) |
638 | pam_syslog(handle, LOG_DEBUG, "Reply from logind: " | |
baae0358 LP |
639 | "id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u original_uid=%u", |
640 | id, object_path, runtime_path, session_fd, seat, vtnr, original_uid); | |
ce959314 | 641 | |
d6baaa69 LP |
642 | r = update_environment(handle, "XDG_SESSION_ID", id); |
643 | if (r != PAM_SUCCESS) | |
5a330cda | 644 | return r; |
8c6db833 | 645 | |
baae0358 LP |
646 | if (original_uid == pw->pw_uid) { |
647 | /* Don't set $XDG_RUNTIME_DIR if the user we now | |
648 | * authenticated for does not match the original user | |
649 | * of the session. We do this in order not to result | |
650 | * in privileged apps clobbering the runtime directory | |
651 | * unnecessarily. */ | |
652 | ||
b9217112 LP |
653 | if (validate_runtime_directory(handle, runtime_path, pw->pw_uid)) { |
654 | r = update_environment(handle, "XDG_RUNTIME_DIR", runtime_path); | |
655 | if (r != PAM_SUCCESS) | |
656 | return r; | |
657 | } | |
00efd498 ZJS |
658 | |
659 | r = export_legacy_dbus_address(handle, pw->pw_uid, runtime_path); | |
660 | if (r != PAM_SUCCESS) | |
661 | return r; | |
98a28fef | 662 | } |
8c6db833 | 663 | |
b2f74f07 LP |
664 | /* Most likely we got the session/type/class from environment variables, but might have gotten the data |
665 | * somewhere else (for example PAM module parameters). Let's now update the environment variables, so that this | |
666 | * data is inherited into the session processes, and programs can rely on them to be initialized. */ | |
667 | ||
668 | r = update_environment(handle, "XDG_SESSION_TYPE", type); | |
669 | if (r != PAM_SUCCESS) | |
670 | return r; | |
671 | ||
672 | r = update_environment(handle, "XDG_SESSION_CLASS", class); | |
673 | if (r != PAM_SUCCESS) | |
674 | return r; | |
675 | ||
676 | r = update_environment(handle, "XDG_SESSION_DESKTOP", desktop); | |
677 | if (r != PAM_SUCCESS) | |
678 | return r; | |
679 | ||
d6baaa69 LP |
680 | r = update_environment(handle, "XDG_SEAT", seat); |
681 | if (r != PAM_SUCCESS) | |
682 | return r; | |
bbc73283 LP |
683 | |
684 | if (vtnr > 0) { | |
29d230f6 | 685 | char buf[DECIMAL_STR_MAX(vtnr)]; |
baae0358 | 686 | sprintf(buf, "%u", vtnr); |
bbc73283 | 687 | |
d6baaa69 LP |
688 | r = update_environment(handle, "XDG_VTNR", buf); |
689 | if (r != PAM_SUCCESS) | |
5a330cda | 690 | return r; |
bbc73283 LP |
691 | } |
692 | ||
77085881 LP |
693 | r = pam_set_data(handle, "systemd.existing", INT_TO_PTR(!!existing), NULL); |
694 | if (r != PAM_SUCCESS) { | |
695 | pam_syslog(handle, LOG_ERR, "Failed to install existing flag."); | |
5a330cda | 696 | return r; |
77085881 LP |
697 | } |
698 | ||
21c390cc | 699 | if (session_fd >= 0) { |
85c08dc0 | 700 | session_fd = fcntl(session_fd, F_DUPFD_CLOEXEC, 3); |
5a330cda ZJS |
701 | if (session_fd < 0) { |
702 | pam_syslog(handle, LOG_ERR, "Failed to dup session fd: %m"); | |
703 | return PAM_SESSION_ERR; | |
704 | } | |
705 | ||
23e096cc | 706 | r = pam_set_data(handle, "systemd.session-fd", FD_TO_PTR(session_fd), NULL); |
21c390cc LP |
707 | if (r != PAM_SUCCESS) { |
708 | pam_syslog(handle, LOG_ERR, "Failed to install session fd."); | |
03e334a1 | 709 | safe_close(session_fd); |
5a330cda | 710 | return r; |
21c390cc | 711 | } |
98a28fef | 712 | } |
8c6db833 | 713 | |
ffcfcb6b | 714 | return PAM_SUCCESS; |
98a28fef | 715 | } |
8c6db833 | 716 | |
98a28fef LP |
717 | _public_ PAM_EXTERN int pam_sm_close_session( |
718 | pam_handle_t *handle, | |
719 | int flags, | |
720 | int argc, const char **argv) { | |
8c6db833 | 721 | |
4afd3348 LP |
722 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
723 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; | |
5f41d1f1 | 724 | const void *existing = NULL; |
75c8e3cf | 725 | const char *id; |
75c8e3cf | 726 | int r; |
8c6db833 | 727 | |
ffcfcb6b | 728 | assert(handle); |
75c8e3cf | 729 | |
77085881 LP |
730 | /* Only release session if it wasn't pre-existing when we |
731 | * tried to create it */ | |
d487e2d6 | 732 | (void) pam_get_data(handle, "systemd.existing", &existing); |
77085881 | 733 | |
75c8e3cf | 734 | id = pam_getenv(handle, "XDG_SESSION_ID"); |
77085881 | 735 | if (id && !existing) { |
75c8e3cf LP |
736 | |
737 | /* Before we go and close the FIFO we need to tell | |
738 | * logind that this is a clean session shutdown, so | |
739 | * that it doesn't just go and slaughter us | |
740 | * immediately after closing the fd */ | |
741 | ||
ffcfcb6b ZJS |
742 | r = sd_bus_open_system(&bus); |
743 | if (r < 0) { | |
5f41d1f1 LP |
744 | pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror(-r)); |
745 | return PAM_SESSION_ERR; | |
75c8e3cf LP |
746 | } |
747 | ||
ffcfcb6b ZJS |
748 | r = sd_bus_call_method(bus, |
749 | "org.freedesktop.login1", | |
750 | "/org/freedesktop/login1", | |
751 | "org.freedesktop.login1.Manager", | |
752 | "ReleaseSession", | |
753 | &error, | |
754 | NULL, | |
755 | "s", | |
756 | id); | |
757 | if (r < 0) { | |
5f41d1f1 LP |
758 | pam_syslog(handle, LOG_ERR, "Failed to release session: %s", bus_error_message(&error, r)); |
759 | return PAM_SESSION_ERR; | |
75c8e3cf LP |
760 | } |
761 | } | |
762 | ||
5f41d1f1 LP |
763 | /* Note that we are knowingly leaking the FIFO fd here. This |
764 | * way, logind can watch us die. If we closed it here it would | |
765 | * not have any clue when that is completed. Given that one | |
766 | * cannot really have multiple PAM sessions open from the same | |
767 | * process this means we will leak one FD at max. */ | |
75c8e3cf | 768 | |
5f41d1f1 | 769 | return PAM_SUCCESS; |
8c6db833 | 770 | } |