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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> | |
ca78ad1d ZJS |
13 | #include <sys/stat.h> |
14 | #include <sys/types.h> | |
15 | #include <unistd.h> | |
8c6db833 | 16 | |
b5efdb8a | 17 | #include "alloc-util.h" |
430f0182 | 18 | #include "audit-util.h" |
00229fe4 LP |
19 | #include "bus-common-errors.h" |
20 | #include "bus-error.h" | |
47094ce0 | 21 | #include "bus-internal.h" |
ffcfcb6b | 22 | #include "bus-util.h" |
fdb3deca | 23 | #include "cgroup-setup.h" |
4bbccb02 | 24 | #include "errno-util.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" |
e37e5ed3 | 32 | #include "path-util.h" |
df0ff127 | 33 | #include "process-util.h" |
00229fe4 | 34 | #include "socket-util.h" |
055c08ef | 35 | #include "stdio-util.h" |
00229fe4 LP |
36 | #include "strv.h" |
37 | #include "terminal-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, |
f5cb2820 | 44 | const char **desktop, |
baae0358 | 45 | bool *debug) { |
8c6db833 LP |
46 | |
47 | unsigned i; | |
48 | ||
49 | assert(argc >= 0); | |
50 | assert(argc == 0 || argv); | |
51 | ||
49ebd11f | 52 | for (i = 0; i < (unsigned) argc; i++) { |
d9608d40 LP |
53 | const char *p; |
54 | ||
55 | if ((p = startswith(argv[i], "class="))) { | |
485507b8 | 56 | if (class) |
d9608d40 | 57 | *class = p; |
485507b8 | 58 | |
d9608d40 | 59 | } else if ((p = startswith(argv[i], "type="))) { |
49ebd11f | 60 | if (type) |
d9608d40 | 61 | *type = p; |
49ebd11f | 62 | |
d9608d40 | 63 | } else if ((p = startswith(argv[i], "desktop="))) { |
f5cb2820 | 64 | if (desktop) |
d9608d40 | 65 | *desktop = p; |
f5cb2820 | 66 | |
05a049cc ZJS |
67 | } else if (streq(argv[i], "debug")) { |
68 | if (debug) | |
69 | *debug = true; | |
fb6becb4 | 70 | |
d9608d40 | 71 | } else if ((p = startswith(argv[i], "debug="))) { |
05a049cc | 72 | int k; |
0e318cad | 73 | |
d9608d40 | 74 | k = parse_boolean(p); |
05a049cc | 75 | if (k < 0) |
d9608d40 | 76 | pam_syslog(handle, LOG_WARNING, "Failed to parse debug= argument, ignoring: %s", p); |
05a049cc | 77 | else if (debug) |
0e318cad MS |
78 | *debug = k; |
79 | ||
05a049cc | 80 | } else |
fb6becb4 | 81 | pam_syslog(handle, LOG_WARNING, "Unknown parameter '%s', ignoring", argv[i]); |
49ebd11f | 82 | } |
8c6db833 | 83 | |
8c6db833 LP |
84 | return 0; |
85 | } | |
86 | ||
8c6db833 LP |
87 | static int get_user_data( |
88 | pam_handle_t *handle, | |
89 | const char **ret_username, | |
90 | struct passwd **ret_pw) { | |
91 | ||
d90b9d27 LP |
92 | const char *username = NULL; |
93 | struct passwd *pw = NULL; | |
8c6db833 LP |
94 | int r; |
95 | ||
96 | assert(handle); | |
97 | assert(ret_username); | |
98 | assert(ret_pw); | |
99 | ||
baae0358 LP |
100 | r = pam_get_user(handle, &username, NULL); |
101 | if (r != PAM_SUCCESS) { | |
d9608d40 | 102 | pam_syslog(handle, LOG_ERR, "Failed to get user name: %s", pam_strerror(handle, r)); |
baae0358 LP |
103 | return r; |
104 | } | |
d90b9d27 | 105 | |
baae0358 LP |
106 | if (isempty(username)) { |
107 | pam_syslog(handle, LOG_ERR, "User name not valid."); | |
108 | return PAM_AUTH_ERR; | |
8c6db833 LP |
109 | } |
110 | ||
baae0358 | 111 | pw = pam_modutil_getpwnam(handle, username); |
d90b9d27 | 112 | if (!pw) { |
8c6db833 LP |
113 | pam_syslog(handle, LOG_ERR, "Failed to get user data."); |
114 | return PAM_USER_UNKNOWN; | |
115 | } | |
116 | ||
117 | *ret_pw = pw; | |
8e24a4f8 | 118 | *ret_username = username; |
8c6db833 LP |
119 | |
120 | return PAM_SUCCESS; | |
121 | } | |
122 | ||
ecd5f1a9 LP |
123 | static bool display_is_local(const char *display) { |
124 | assert(display); | |
125 | ||
126 | return | |
127 | display[0] == ':' && | |
128 | display[1] >= '0' && | |
129 | display[1] <= '9'; | |
130 | } | |
131 | ||
f7b8b5c4 LP |
132 | static int socket_from_display(const char *display, char **path) { |
133 | size_t k; | |
134 | char *f, *c; | |
135 | ||
136 | assert(display); | |
137 | assert(path); | |
138 | ||
139 | if (!display_is_local(display)) | |
140 | return -EINVAL; | |
141 | ||
142 | k = strspn(display+1, "0123456789"); | |
143 | ||
144 | f = new(char, STRLEN("/tmp/.X11-unix/X") + k + 1); | |
145 | if (!f) | |
146 | return -ENOMEM; | |
147 | ||
148 | c = stpcpy(f, "/tmp/.X11-unix/X"); | |
149 | memcpy(c, display+1, k); | |
150 | c[k] = 0; | |
151 | ||
152 | *path = f; | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
4d6d6518 | 157 | static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) { |
15a3e96f | 158 | union sockaddr_union sa = {}; |
baae0358 LP |
159 | _cleanup_free_ char *p = NULL, *tty = NULL; |
160 | _cleanup_close_ int fd = -1; | |
4d6d6518 | 161 | struct ucred ucred; |
15a3e96f | 162 | int v, r, salen; |
4d6d6518 LP |
163 | |
164 | assert(display); | |
4d6d6518 LP |
165 | assert(vtnr); |
166 | ||
167 | /* We deduce the X11 socket from the display name, then use | |
168 | * SO_PEERCRED to determine the X11 server process, ask for | |
169 | * the controlling tty of that and if it's a VC then we know | |
170 | * the seat and the virtual terminal. Sounds ugly, is only | |
171 | * semi-ugly. */ | |
172 | ||
173 | r = socket_from_display(display, &p); | |
174 | if (r < 0) | |
175 | return r; | |
15a3e96f LP |
176 | salen = sockaddr_un_set_path(&sa.un, p); |
177 | if (salen < 0) | |
178 | return salen; | |
4d6d6518 LP |
179 | |
180 | fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0); | |
b92bea5d | 181 | if (fd < 0) |
4d6d6518 | 182 | return -errno; |
4d6d6518 | 183 | |
15a3e96f | 184 | if (connect(fd, &sa.sa, salen) < 0) |
4d6d6518 | 185 | return -errno; |
4d6d6518 | 186 | |
eff05270 | 187 | r = getpeercred(fd, &ucred); |
4d6d6518 | 188 | if (r < 0) |
eff05270 | 189 | return r; |
4d6d6518 LP |
190 | |
191 | r = get_ctty(ucred.pid, NULL, &tty); | |
192 | if (r < 0) | |
193 | return r; | |
194 | ||
195 | v = vtnr_from_tty(tty); | |
4d6d6518 LP |
196 | if (v < 0) |
197 | return v; | |
198 | else if (v == 0) | |
199 | return -ENOENT; | |
200 | ||
fc7985ed LP |
201 | if (seat) |
202 | *seat = "seat0"; | |
4d6d6518 LP |
203 | *vtnr = (uint32_t) v; |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
00efd498 ZJS |
208 | static int export_legacy_dbus_address( |
209 | pam_handle_t *handle, | |
210 | uid_t uid, | |
211 | const char *runtime) { | |
212 | ||
15ee6c20 ZJS |
213 | const char *s; |
214 | _cleanup_free_ char *t = NULL; | |
00efd498 ZJS |
215 | int r = PAM_BUF_ERR; |
216 | ||
15ee6c20 ZJS |
217 | /* We need to export $DBUS_SESSION_BUS_ADDRESS because various applications will not connect |
218 | * correctly to the bus without it. This setting matches what dbus.socket does for the user | |
219 | * session using 'systemctl --user set-environment'. We want to have the same configuration | |
220 | * in processes started from the PAM session. | |
221 | * | |
222 | * The setting of the address is guarded by the access() check because it is also possible to compile | |
223 | * dbus without --enable-user-session, in which case this socket is not used, and | |
224 | * $DBUS_SESSION_BUS_ADDRESS should not be set. An alternative approach would to not do the access() | |
225 | * check here, and let applications try on their own, by using "unix:path=%s/bus;autolaunch:". But we | |
226 | * expect the socket to be present by the time we do this check, so we can just as well check once | |
227 | * here. */ | |
228 | ||
229 | s = strjoina(runtime, "/bus"); | |
230 | if (access(s, F_OK) < 0) | |
231 | return PAM_SUCCESS; | |
232 | ||
233 | if (asprintf(&t, DEFAULT_USER_BUS_ADDRESS_FMT, runtime) < 0) | |
00efd498 ZJS |
234 | goto error; |
235 | ||
15ee6c20 | 236 | r = pam_misc_setenv(handle, "DBUS_SESSION_BUS_ADDRESS", t, 0); |
00efd498 ZJS |
237 | if (r != PAM_SUCCESS) |
238 | goto error; | |
239 | ||
240 | return PAM_SUCCESS; | |
241 | ||
242 | error: | |
243 | pam_syslog(handle, LOG_ERR, "Failed to set bus variable."); | |
244 | return r; | |
245 | } | |
246 | ||
22f93314 JS |
247 | static int append_session_memory_max(pam_handle_t *handle, sd_bus_message *m, const char *limit) { |
248 | uint64_t val; | |
249 | int r; | |
250 | ||
251 | if (isempty(limit)) | |
252 | return 0; | |
253 | ||
254 | if (streq(limit, "infinity")) { | |
255 | r = sd_bus_message_append(m, "(sv)", "MemoryMax", "t", (uint64_t)-1); | |
256 | if (r < 0) { | |
4bbccb02 | 257 | pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror_safe(r)); |
22f93314 JS |
258 | return r; |
259 | } | |
260 | } else { | |
f806dfd3 | 261 | r = parse_permille(limit); |
22f93314 | 262 | if (r >= 0) { |
f806dfd3 | 263 | r = sd_bus_message_append(m, "(sv)", "MemoryMaxScale", "u", (uint32_t) (((uint64_t) r * UINT32_MAX) / 1000U)); |
22f93314 | 264 | if (r < 0) { |
4bbccb02 | 265 | pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror_safe(r)); |
22f93314 JS |
266 | return r; |
267 | } | |
268 | } else { | |
269 | r = parse_size(limit, 1024, &val); | |
270 | if (r >= 0) { | |
271 | r = sd_bus_message_append(m, "(sv)", "MemoryMax", "t", val); | |
272 | if (r < 0) { | |
4bbccb02 | 273 | pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror_safe(r)); |
22f93314 JS |
274 | return r; |
275 | } | |
276 | } else | |
de5e9096 | 277 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.memory_max: %s, ignoring.", limit); |
22f93314 JS |
278 | } |
279 | } | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
adc09af2 PW |
284 | static int append_session_runtime_max_sec(pam_handle_t *handle, sd_bus_message *m, const char *limit) { |
285 | usec_t val; | |
286 | int r; | |
287 | ||
288 | /* No need to parse "infinity" here, it will be set by default later in scope_init() */ | |
289 | if (isempty(limit) || streq(limit, "infinity")) | |
290 | return 0; | |
291 | ||
292 | r = parse_sec(limit, &val); | |
293 | if (r >= 0) { | |
294 | r = sd_bus_message_append(m, "(sv)", "RuntimeMaxUSec", "t", (uint64_t) val); | |
295 | if (r < 0) { | |
296 | pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror_safe(r)); | |
297 | return r; | |
298 | } | |
299 | } else | |
300 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.runtime_max_sec: %s, ignoring.", limit); | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
5fdfbbd5 | 305 | static int append_session_tasks_max(pam_handle_t *handle, sd_bus_message *m, const char *limit) { |
22f93314 JS |
306 | uint64_t val; |
307 | int r; | |
308 | ||
309 | /* No need to parse "infinity" here, it will be set unconditionally later in manager_start_scope() */ | |
310 | if (isempty(limit) || streq(limit, "infinity")) | |
311 | return 0; | |
312 | ||
313 | r = safe_atou64(limit, &val); | |
314 | if (r >= 0) { | |
315 | r = sd_bus_message_append(m, "(sv)", "TasksMax", "t", val); | |
316 | if (r < 0) { | |
4bbccb02 | 317 | pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror_safe(r)); |
22f93314 JS |
318 | return r; |
319 | } | |
320 | } else | |
de5e9096 | 321 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.tasks_max: %s, ignoring.", limit); |
22f93314 JS |
322 | |
323 | return 0; | |
324 | } | |
325 | ||
326 | static int append_session_cg_weight(pam_handle_t *handle, sd_bus_message *m, const char *limit, const char *field) { | |
327 | uint64_t val; | |
328 | int r; | |
329 | ||
36a4dbae LP |
330 | if (isempty(limit)) |
331 | return 0; | |
332 | ||
333 | r = cg_weight_parse(limit, &val); | |
334 | if (r >= 0) { | |
335 | r = sd_bus_message_append(m, "(sv)", field, "t", val); | |
336 | if (r < 0) { | |
4bbccb02 | 337 | pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror_safe(r)); |
36a4dbae LP |
338 | return r; |
339 | } | |
340 | } else if (streq(field, "CPUWeight")) | |
341 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.cpu_weight: %s, ignoring.", limit); | |
342 | else | |
343 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.io_weight: %s, ignoring.", limit); | |
22f93314 JS |
344 | |
345 | return 0; | |
346 | } | |
347 | ||
0ecc1c9d LP |
348 | static const char* getenv_harder(pam_handle_t *handle, const char *key, const char *fallback) { |
349 | const char *v; | |
350 | ||
351 | assert(handle); | |
352 | assert(key); | |
353 | ||
5238e957 | 354 | /* Looks for an environment variable, preferably in the environment block associated with the |
83d4ab55 LP |
355 | * specified PAM handle, falling back to the process' block instead. Why check both? Because we want |
356 | * to permit configuration of session properties from unit files that invoke PAM services, so that | |
357 | * PAM services don't have to be reworked to set systemd-specific properties, but these properties | |
358 | * can still be set from the unit file Environment= block. */ | |
0ecc1c9d LP |
359 | |
360 | v = pam_getenv(handle, key); | |
361 | if (!isempty(v)) | |
362 | return v; | |
363 | ||
83d4ab55 LP |
364 | /* We use secure_getenv() here, since we might get loaded into su/sudo, which are SUID. Ideally |
365 | * they'd clean up the environment before invoking foreign code (such as PAM modules), but alas they | |
366 | * currently don't (to be precise, they clean up the environment they pass to their children, but | |
367 | * not their own environ[]). */ | |
368 | v = secure_getenv(key); | |
0ecc1c9d LP |
369 | if (!isempty(v)) |
370 | return v; | |
371 | ||
372 | return fallback; | |
373 | } | |
374 | ||
d6baaa69 LP |
375 | static int update_environment(pam_handle_t *handle, const char *key, const char *value) { |
376 | int r; | |
377 | ||
378 | assert(handle); | |
379 | assert(key); | |
380 | ||
381 | /* Updates the environment, but only if there's actually a value set. Also, log about errors */ | |
382 | ||
383 | if (isempty(value)) | |
384 | return PAM_SUCCESS; | |
385 | ||
386 | r = pam_misc_setenv(handle, key, value, 0); | |
387 | if (r != PAM_SUCCESS) | |
d9608d40 | 388 | pam_syslog(handle, LOG_ERR, "Failed to set environment variable %s: %s", key, pam_strerror(handle, r)); |
d6baaa69 LP |
389 | |
390 | return r; | |
391 | } | |
392 | ||
b9217112 LP |
393 | static bool validate_runtime_directory(pam_handle_t *handle, const char *path, uid_t uid) { |
394 | struct stat st; | |
395 | ||
396 | assert(path); | |
397 | ||
398 | /* Just some extra paranoia: let's not set $XDG_RUNTIME_DIR if the directory we'd set it to isn't actually set | |
399 | * up properly for us. */ | |
400 | ||
401 | if (lstat(path, &st) < 0) { | |
4bbccb02 | 402 | pam_syslog(handle, LOG_ERR, "Failed to stat() runtime directory '%s': %s", path, strerror_safe(errno)); |
b9217112 LP |
403 | goto fail; |
404 | } | |
405 | ||
406 | if (!S_ISDIR(st.st_mode)) { | |
407 | pam_syslog(handle, LOG_ERR, "Runtime directory '%s' is not actually a directory.", path); | |
408 | goto fail; | |
409 | } | |
410 | ||
411 | if (st.st_uid != uid) { | |
412 | pam_syslog(handle, LOG_ERR, "Runtime directory '%s' is not owned by UID " UID_FMT ", as it should.", path, uid); | |
413 | goto fail; | |
414 | } | |
415 | ||
416 | return true; | |
417 | ||
418 | fail: | |
419 | pam_syslog(handle, LOG_WARNING, "Not setting $XDG_RUNTIME_DIR, as the directory is not in order."); | |
420 | return false; | |
421 | } | |
422 | ||
98a28fef | 423 | _public_ PAM_EXTERN int pam_sm_open_session( |
8c6db833 LP |
424 | pam_handle_t *handle, |
425 | int flags, | |
426 | int argc, const char **argv) { | |
427 | ||
4afd3348 | 428 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
22f93314 | 429 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL; |
d1529c9e LP |
430 | const char |
431 | *username, *id, *object_path, *runtime_path, | |
432 | *service = NULL, | |
433 | *tty = NULL, *display = NULL, | |
434 | *remote_user = NULL, *remote_host = NULL, | |
435 | *seat = NULL, | |
436 | *type = NULL, *class = NULL, | |
f5cb2820 | 437 | *class_pam = NULL, *type_pam = NULL, *cvtnr = NULL, *desktop = NULL, *desktop_pam = NULL, |
adc09af2 | 438 | *memory_max = NULL, *tasks_max = NULL, *cpu_weight = NULL, *io_weight = NULL, *runtime_max_sec = NULL; |
4afd3348 | 439 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; |
d1529c9e | 440 | int session_fd = -1, existing, r; |
d1529c9e LP |
441 | bool debug = false, remote; |
442 | struct passwd *pw; | |
baae0358 LP |
443 | uint32_t vtnr = 0; |
444 | uid_t original_uid; | |
8c6db833 | 445 | |
ffcfcb6b | 446 | assert(handle); |
98a28fef | 447 | |
79d860fe MP |
448 | /* Make this a NOP on non-logind systems */ |
449 | if (!logind_running()) | |
8c6db833 LP |
450 | return PAM_SUCCESS; |
451 | ||
e9fbc77c LP |
452 | if (parse_argv(handle, |
453 | argc, argv, | |
fb6becb4 | 454 | &class_pam, |
49ebd11f | 455 | &type_pam, |
f5cb2820 | 456 | &desktop_pam, |
5a330cda ZJS |
457 | &debug) < 0) |
458 | return PAM_SESSION_ERR; | |
74fe1fe3 | 459 | |
baae0358 | 460 | if (debug) |
3831838a | 461 | pam_syslog(handle, LOG_DEBUG, "pam-systemd initializing"); |
baae0358 | 462 | |
98a28fef | 463 | r = get_user_data(handle, &username, &pw); |
42e66809 | 464 | if (r != PAM_SUCCESS) |
5a330cda | 465 | return r; |
8c6db833 | 466 | |
30b2c336 LP |
467 | /* Make sure we don't enter a loop by talking to |
468 | * systemd-logind when it is actually waiting for the | |
469 | * background to finish start-up. If the service is | |
5c390a4a | 470 | * "systemd-user" we simply set XDG_RUNTIME_DIR and |
30b2c336 LP |
471 | * leave. */ |
472 | ||
1798f5af | 473 | (void) pam_get_item(handle, PAM_SERVICE, (const void**) &service); |
5c390a4a | 474 | if (streq_ptr(service, "systemd-user")) { |
055c08ef | 475 | char rt[STRLEN("/run/user/") + DECIMAL_STR_MAX(uid_t)]; |
30b2c336 | 476 | |
055c08ef | 477 | xsprintf(rt, "/run/user/"UID_FMT, pw->pw_uid); |
b9217112 LP |
478 | if (validate_runtime_directory(handle, rt, pw->pw_uid)) { |
479 | r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0); | |
480 | if (r != PAM_SUCCESS) { | |
d9608d40 | 481 | pam_syslog(handle, LOG_ERR, "Failed to set runtime dir: %s", pam_strerror(handle, r)); |
b9217112 LP |
482 | return r; |
483 | } | |
30b2c336 LP |
484 | } |
485 | ||
00efd498 ZJS |
486 | r = export_legacy_dbus_address(handle, pw->pw_uid, rt); |
487 | if (r != PAM_SUCCESS) | |
488 | return r; | |
489 | ||
ffcfcb6b | 490 | return PAM_SUCCESS; |
8c6db833 LP |
491 | } |
492 | ||
ffcfcb6b | 493 | /* Otherwise, we ask logind to create a session for us */ |
8c6db833 | 494 | |
1798f5af LP |
495 | (void) pam_get_item(handle, PAM_XDISPLAY, (const void**) &display); |
496 | (void) pam_get_item(handle, PAM_TTY, (const void**) &tty); | |
497 | (void) pam_get_item(handle, PAM_RUSER, (const void**) &remote_user); | |
498 | (void) pam_get_item(handle, PAM_RHOST, (const void**) &remote_host); | |
a8573ccc | 499 | |
0ecc1c9d LP |
500 | seat = getenv_harder(handle, "XDG_SEAT", NULL); |
501 | cvtnr = getenv_harder(handle, "XDG_VTNR", NULL); | |
502 | type = getenv_harder(handle, "XDG_SESSION_TYPE", type_pam); | |
503 | class = getenv_harder(handle, "XDG_SESSION_CLASS", class_pam); | |
f5cb2820 | 504 | desktop = getenv_harder(handle, "XDG_SESSION_DESKTOP", desktop_pam); |
a4cd87e9 | 505 | |
ed18b08b | 506 | tty = strempty(tty); |
98a28fef | 507 | |
ee8545b0 | 508 | if (strchr(tty, ':')) { |
3a736949 LP |
509 | /* A tty with a colon is usually an X11 display, placed there to show up in utmp. We rearrange things |
510 | * and don't pretend that an X display was a tty. */ | |
ee8545b0 LP |
511 | if (isempty(display)) |
512 | display = tty; | |
a4cd87e9 | 513 | tty = NULL; |
3a736949 | 514 | |
1a4459d6 | 515 | } else if (streq(tty, "cron")) { |
3a736949 LP |
516 | /* cron is setting PAM_TTY to "cron" for some reason (the commit carries no information why, but |
517 | * probably because it wants to set it to something as pam_time/pam_access/… require PAM_TTY to be set | |
518 | * (as they otherwise even try to update it!) — but cron doesn't actually allocate a TTY for its forked | |
519 | * off processes.) */ | |
0ad1271f | 520 | type = "unspecified"; |
49ebd11f | 521 | class = "background"; |
a4cd87e9 | 522 | tty = NULL; |
3a736949 | 523 | |
0ad1271f | 524 | } else if (streq(tty, "ssh")) { |
3a736949 LP |
525 | /* ssh has been setting PAM_TTY to "ssh" (for the same reason as cron does this, see above. For further |
526 | * details look for "PAM_TTY_KLUDGE" in the openssh sources). */ | |
0ad1271f | 527 | type ="tty"; |
49ebd11f | 528 | class = "user"; |
3a736949 LP |
529 | tty = NULL; /* This one is particularly sad, as this means that ssh sessions — even though usually |
530 | * associated with a pty — won't be tracked by their tty in logind. This is because ssh | |
531 | * does the PAM session registration early for new connections, and registers a pty only | |
532 | * much later (this is because it doesn't know yet if it needs one at all, as whether to | |
533 | * register a pty or not is negotiated much later in the protocol). */ | |
534 | ||
c9ed61e7 LP |
535 | } else |
536 | /* Chop off leading /dev prefix that some clients specify, but others do not. */ | |
537 | tty = skip_dev_prefix(tty); | |
ee8545b0 | 538 | |
8e7705e5 | 539 | /* If this fails vtnr will be 0, that's intended */ |
4d6d6518 | 540 | if (!isempty(cvtnr)) |
2ae4842b | 541 | (void) safe_atou32(cvtnr, &vtnr); |
4d6d6518 | 542 | |
92bd5ff3 | 543 | if (!isempty(display) && !vtnr) { |
fc7985ed | 544 | if (isempty(seat)) |
d487e2d6 | 545 | (void) get_seat_from_display(display, &seat, &vtnr); |
fc7985ed | 546 | else if (streq(seat, "seat0")) |
d487e2d6 | 547 | (void) get_seat_from_display(display, NULL, &vtnr); |
fc7985ed | 548 | } |
4d6d6518 | 549 | |
49ebd11f | 550 | if (seat && !streq(seat, "seat0") && vtnr != 0) { |
2675747f LP |
551 | if (debug) |
552 | pam_syslog(handle, LOG_DEBUG, "Ignoring vtnr %"PRIu32" for %s which is not seat0", vtnr, seat); | |
d7353ef6 MM |
553 | vtnr = 0; |
554 | } | |
555 | ||
49ebd11f | 556 | if (isempty(type)) |
0ad1271f | 557 | type = !isempty(display) ? "x11" : |
49ebd11f | 558 | !isempty(tty) ? "tty" : "unspecified"; |
98a28fef | 559 | |
55efac6c | 560 | if (isempty(class)) |
e2acb67b | 561 | class = streq(type, "unspecified") ? "background" : "user"; |
55efac6c | 562 | |
fecc80c1 | 563 | remote = !isempty(remote_host) && !is_localhost(remote_host); |
98a28fef | 564 | |
22f93314 JS |
565 | (void) pam_get_data(handle, "systemd.memory_max", (const void **)&memory_max); |
566 | (void) pam_get_data(handle, "systemd.tasks_max", (const void **)&tasks_max); | |
567 | (void) pam_get_data(handle, "systemd.cpu_weight", (const void **)&cpu_weight); | |
568 | (void) pam_get_data(handle, "systemd.io_weight", (const void **)&io_weight); | |
adc09af2 | 569 | (void) pam_get_data(handle, "systemd.runtime_max_sec", (const void **)&runtime_max_sec); |
22f93314 | 570 | |
4d49b48c | 571 | /* Talk to logind over the message bus */ |
5a330cda | 572 | |
ffcfcb6b ZJS |
573 | r = sd_bus_open_system(&bus); |
574 | if (r < 0) { | |
4bbccb02 | 575 | pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror_safe(r)); |
ffcfcb6b | 576 | return PAM_SESSION_ERR; |
cc377381 LP |
577 | } |
578 | ||
22f93314 | 579 | if (debug) { |
ce959314 | 580 | pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: " |
1fa2f38f | 581 | "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 | 582 | pw->pw_uid, getpid_cached(), |
baae0358 | 583 | strempty(service), |
cda7ecb0 | 584 | type, class, strempty(desktop), |
a4cd87e9 | 585 | strempty(seat), vtnr, strempty(tty), strempty(display), |
baae0358 | 586 | yes_no(remote), strempty(remote_user), strempty(remote_host)); |
22f93314 | 587 | pam_syslog(handle, LOG_DEBUG, "Session limits: " |
adc09af2 PW |
588 | "memory_max=%s tasks_max=%s cpu_weight=%s io_weight=%s runtime_max_sec=%s", |
589 | strna(memory_max), strna(tasks_max), strna(cpu_weight), strna(io_weight), strna(runtime_max_sec)); | |
22f93314 JS |
590 | } |
591 | ||
592 | r = sd_bus_message_new_method_call( | |
593 | bus, | |
594 | &m, | |
595 | "org.freedesktop.login1", | |
596 | "/org/freedesktop/login1", | |
597 | "org.freedesktop.login1.Manager", | |
598 | "CreateSession"); | |
599 | if (r < 0) { | |
4bbccb02 | 600 | pam_syslog(handle, LOG_ERR, "Failed to create CreateSession method call: %s", strerror_safe(r)); |
22f93314 JS |
601 | return PAM_SESSION_ERR; |
602 | } | |
603 | ||
604 | r = sd_bus_message_append(m, "uusssssussbss", | |
605 | (uint32_t) pw->pw_uid, | |
da0da5ec | 606 | 0, |
22f93314 JS |
607 | service, |
608 | type, | |
609 | class, | |
610 | desktop, | |
611 | seat, | |
612 | vtnr, | |
613 | tty, | |
614 | display, | |
615 | remote, | |
616 | remote_user, | |
617 | remote_host); | |
618 | if (r < 0) { | |
4bbccb02 | 619 | pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror_safe(r)); |
22f93314 JS |
620 | return PAM_SESSION_ERR; |
621 | } | |
622 | ||
623 | r = sd_bus_message_open_container(m, 'a', "(sv)"); | |
624 | if (r < 0) { | |
4bbccb02 | 625 | pam_syslog(handle, LOG_ERR, "Failed to open message container: %s", strerror_safe(r)); |
22f93314 JS |
626 | return PAM_SYSTEM_ERR; |
627 | } | |
628 | ||
629 | r = append_session_memory_max(handle, m, memory_max); | |
630 | if (r < 0) | |
631 | return PAM_SESSION_ERR; | |
632 | ||
adc09af2 PW |
633 | r = append_session_runtime_max_sec(handle, m, runtime_max_sec); |
634 | if (r < 0) | |
635 | return PAM_SESSION_ERR; | |
636 | ||
22f93314 JS |
637 | r = append_session_tasks_max(handle, m, tasks_max); |
638 | if (r < 0) | |
639 | return PAM_SESSION_ERR; | |
640 | ||
641 | r = append_session_cg_weight(handle, m, cpu_weight, "CPUWeight"); | |
642 | if (r < 0) | |
643 | return PAM_SESSION_ERR; | |
644 | ||
645 | r = append_session_cg_weight(handle, m, io_weight, "IOWeight"); | |
646 | if (r < 0) | |
647 | return PAM_SESSION_ERR; | |
648 | ||
649 | r = sd_bus_message_close_container(m); | |
650 | if (r < 0) { | |
4bbccb02 | 651 | pam_syslog(handle, LOG_ERR, "Failed to close message container: %s", strerror_safe(r)); |
22f93314 JS |
652 | return PAM_SYSTEM_ERR; |
653 | } | |
ce959314 | 654 | |
22f93314 | 655 | r = sd_bus_call(bus, m, 0, &error, &reply); |
ffcfcb6b | 656 | if (r < 0) { |
b80120c4 | 657 | if (sd_bus_error_has_name(&error, BUS_ERROR_SESSION_BUSY)) { |
2675747f | 658 | if (debug) |
c7e93c4d | 659 | pam_syslog(handle, LOG_DEBUG, "Not creating session: %s", bus_error_message(&error, r)); |
b80120c4 DH |
660 | return PAM_SUCCESS; |
661 | } else { | |
662 | pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error, r)); | |
8d46418e | 663 | return PAM_SESSION_ERR; |
b80120c4 | 664 | } |
98a28fef | 665 | } |
74fe1fe3 | 666 | |
ffcfcb6b | 667 | r = sd_bus_message_read(reply, |
baae0358 | 668 | "soshusub", |
ffcfcb6b ZJS |
669 | &id, |
670 | &object_path, | |
671 | &runtime_path, | |
672 | &session_fd, | |
baae0358 | 673 | &original_uid, |
ffcfcb6b ZJS |
674 | &seat, |
675 | &vtnr, | |
676 | &existing); | |
677 | if (r < 0) { | |
4bbccb02 | 678 | pam_syslog(handle, LOG_ERR, "Failed to parse message: %s", strerror_safe(r)); |
5a330cda | 679 | return PAM_SESSION_ERR; |
98a28fef | 680 | } |
74fe1fe3 | 681 | |
ce959314 MS |
682 | if (debug) |
683 | pam_syslog(handle, LOG_DEBUG, "Reply from logind: " | |
baae0358 LP |
684 | "id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u original_uid=%u", |
685 | id, object_path, runtime_path, session_fd, seat, vtnr, original_uid); | |
ce959314 | 686 | |
d6baaa69 LP |
687 | r = update_environment(handle, "XDG_SESSION_ID", id); |
688 | if (r != PAM_SUCCESS) | |
5a330cda | 689 | return r; |
8c6db833 | 690 | |
baae0358 LP |
691 | if (original_uid == pw->pw_uid) { |
692 | /* Don't set $XDG_RUNTIME_DIR if the user we now | |
693 | * authenticated for does not match the original user | |
694 | * of the session. We do this in order not to result | |
695 | * in privileged apps clobbering the runtime directory | |
696 | * unnecessarily. */ | |
697 | ||
b9217112 LP |
698 | if (validate_runtime_directory(handle, runtime_path, pw->pw_uid)) { |
699 | r = update_environment(handle, "XDG_RUNTIME_DIR", runtime_path); | |
700 | if (r != PAM_SUCCESS) | |
701 | return r; | |
702 | } | |
00efd498 ZJS |
703 | |
704 | r = export_legacy_dbus_address(handle, pw->pw_uid, runtime_path); | |
705 | if (r != PAM_SUCCESS) | |
706 | return r; | |
98a28fef | 707 | } |
8c6db833 | 708 | |
b2f74f07 LP |
709 | /* Most likely we got the session/type/class from environment variables, but might have gotten the data |
710 | * somewhere else (for example PAM module parameters). Let's now update the environment variables, so that this | |
711 | * data is inherited into the session processes, and programs can rely on them to be initialized. */ | |
712 | ||
713 | r = update_environment(handle, "XDG_SESSION_TYPE", type); | |
714 | if (r != PAM_SUCCESS) | |
715 | return r; | |
716 | ||
717 | r = update_environment(handle, "XDG_SESSION_CLASS", class); | |
718 | if (r != PAM_SUCCESS) | |
719 | return r; | |
720 | ||
721 | r = update_environment(handle, "XDG_SESSION_DESKTOP", desktop); | |
722 | if (r != PAM_SUCCESS) | |
723 | return r; | |
724 | ||
d6baaa69 LP |
725 | r = update_environment(handle, "XDG_SEAT", seat); |
726 | if (r != PAM_SUCCESS) | |
727 | return r; | |
bbc73283 LP |
728 | |
729 | if (vtnr > 0) { | |
29d230f6 | 730 | char buf[DECIMAL_STR_MAX(vtnr)]; |
baae0358 | 731 | sprintf(buf, "%u", vtnr); |
bbc73283 | 732 | |
d6baaa69 LP |
733 | r = update_environment(handle, "XDG_VTNR", buf); |
734 | if (r != PAM_SUCCESS) | |
5a330cda | 735 | return r; |
bbc73283 LP |
736 | } |
737 | ||
77085881 LP |
738 | r = pam_set_data(handle, "systemd.existing", INT_TO_PTR(!!existing), NULL); |
739 | if (r != PAM_SUCCESS) { | |
d9608d40 | 740 | pam_syslog(handle, LOG_ERR, "Failed to install existing flag: %s", pam_strerror(handle, r)); |
5a330cda | 741 | return r; |
77085881 LP |
742 | } |
743 | ||
21c390cc | 744 | if (session_fd >= 0) { |
85c08dc0 | 745 | session_fd = fcntl(session_fd, F_DUPFD_CLOEXEC, 3); |
5a330cda ZJS |
746 | if (session_fd < 0) { |
747 | pam_syslog(handle, LOG_ERR, "Failed to dup session fd: %m"); | |
748 | return PAM_SESSION_ERR; | |
749 | } | |
750 | ||
23e096cc | 751 | r = pam_set_data(handle, "systemd.session-fd", FD_TO_PTR(session_fd), NULL); |
21c390cc | 752 | if (r != PAM_SUCCESS) { |
d9608d40 | 753 | pam_syslog(handle, LOG_ERR, "Failed to install session fd: %s", pam_strerror(handle, r)); |
03e334a1 | 754 | safe_close(session_fd); |
5a330cda | 755 | return r; |
21c390cc | 756 | } |
98a28fef | 757 | } |
8c6db833 | 758 | |
ffcfcb6b | 759 | return PAM_SUCCESS; |
98a28fef | 760 | } |
8c6db833 | 761 | |
98a28fef LP |
762 | _public_ PAM_EXTERN int pam_sm_close_session( |
763 | pam_handle_t *handle, | |
764 | int flags, | |
765 | int argc, const char **argv) { | |
8c6db833 | 766 | |
4afd3348 LP |
767 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
768 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; | |
5f41d1f1 | 769 | const void *existing = NULL; |
75c8e3cf | 770 | const char *id; |
75c8e3cf | 771 | int r; |
8c6db833 | 772 | |
ffcfcb6b | 773 | assert(handle); |
75c8e3cf | 774 | |
77085881 LP |
775 | /* Only release session if it wasn't pre-existing when we |
776 | * tried to create it */ | |
d487e2d6 | 777 | (void) pam_get_data(handle, "systemd.existing", &existing); |
77085881 | 778 | |
75c8e3cf | 779 | id = pam_getenv(handle, "XDG_SESSION_ID"); |
77085881 | 780 | if (id && !existing) { |
75c8e3cf LP |
781 | |
782 | /* Before we go and close the FIFO we need to tell | |
783 | * logind that this is a clean session shutdown, so | |
784 | * that it doesn't just go and slaughter us | |
785 | * immediately after closing the fd */ | |
786 | ||
ffcfcb6b ZJS |
787 | r = sd_bus_open_system(&bus); |
788 | if (r < 0) { | |
4bbccb02 | 789 | pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror_safe(r)); |
5f41d1f1 | 790 | return PAM_SESSION_ERR; |
75c8e3cf LP |
791 | } |
792 | ||
ffcfcb6b ZJS |
793 | r = sd_bus_call_method(bus, |
794 | "org.freedesktop.login1", | |
795 | "/org/freedesktop/login1", | |
796 | "org.freedesktop.login1.Manager", | |
797 | "ReleaseSession", | |
798 | &error, | |
799 | NULL, | |
800 | "s", | |
801 | id); | |
802 | if (r < 0) { | |
5f41d1f1 LP |
803 | pam_syslog(handle, LOG_ERR, "Failed to release session: %s", bus_error_message(&error, r)); |
804 | return PAM_SESSION_ERR; | |
75c8e3cf LP |
805 | } |
806 | } | |
807 | ||
5f41d1f1 LP |
808 | /* Note that we are knowingly leaking the FIFO fd here. This |
809 | * way, logind can watch us die. If we closed it here it would | |
810 | * not have any clue when that is completed. Given that one | |
811 | * cannot really have multiple PAM sessions open from the same | |
812 | * process this means we will leak one FD at max. */ | |
75c8e3cf | 813 | |
5f41d1f1 | 814 | return PAM_SUCCESS; |
8c6db833 | 815 | } |