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1d7b9b20 | 1 | /* |
2 | * Copyright (c) 2000 Andre Lucas. All rights reserved. | |
564dd50a | 3 | * Portions copyright (c) 1998 Todd C. Miller |
4 | * Portions copyright (c) 1996 Jason Downs | |
5 | * Portions copyright (c) 1996 Theo de Raadt | |
1d7b9b20 | 6 | * |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions and the following disclaimer. | |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
1d7b9b20 | 15 | * |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
26 | */ | |
27 | ||
b6610e8f | 28 | /* |
29 | * The btmp logging code is derived from login.c from util-linux and is under | |
30 | * the the following license: | |
31 | * | |
32 | * Copyright (c) 1980, 1987, 1988 The Regents of the University of California. | |
33 | * All rights reserved. | |
34 | * | |
35 | * Redistribution and use in source and binary forms are permitted | |
36 | * provided that the above copyright notice and this paragraph are | |
37 | * duplicated in all such forms and that any documentation, | |
38 | * advertising materials, and other materials related to such | |
39 | * distribution and use acknowledge that the software was developed | |
40 | * by the University of California, Berkeley. The name of the | |
41 | * University may not be used to endorse or promote products derived | |
42 | * from this software without specific prior written permission. | |
43 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
44 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
45 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
46 | */ | |
47 | ||
48 | ||
2b87da3b | 49 | /** |
1d7b9b20 | 50 | ** loginrec.c: platform-independent login recording and lastlog retrieval |
51 | **/ | |
52 | ||
564dd50a | 53 | /* |
fa64c868 | 54 | * The new login code explained |
55 | * ============================ | |
56 | * | |
57 | * This code attempts to provide a common interface to login recording | |
58 | * (utmp and friends) and last login time retrieval. | |
59 | * | |
60 | * Its primary means of achieving this is to use 'struct logininfo', a | |
61 | * union of all the useful fields in the various different types of | |
62 | * system login record structures one finds on UNIX variants. | |
63 | * | |
64 | * We depend on autoconf to define which recording methods are to be | |
65 | * used, and which fields are contained in the relevant data structures | |
66 | * on the local system. Many C preprocessor symbols affect which code | |
67 | * gets compiled here. | |
68 | * | |
69 | * The code is designed to make it easy to modify a particular | |
70 | * recording method, without affecting other methods nor requiring so | |
71 | * many nested conditional compilation blocks as were commonplace in | |
72 | * the old code. | |
73 | * | |
74 | * For login recording, we try to use the local system's libraries as | |
75 | * these are clearly most likely to work correctly. For utmp systems | |
76 | * this usually means login() and logout() or setutent() etc., probably | |
77 | * in libutil, along with logwtmp() etc. On these systems, we fall back | |
78 | * to writing the files directly if we have to, though this method | |
79 | * requires very thorough testing so we do not corrupt local auditing | |
80 | * information. These files and their access methods are very system | |
81 | * specific indeed. | |
82 | * | |
83 | * For utmpx systems, the corresponding library functions are | |
84 | * setutxent() etc. To the author's knowledge, all utmpx systems have | |
85 | * these library functions and so no direct write is attempted. If such | |
86 | * a system exists and needs support, direct analogues of the [uw]tmp | |
87 | * code should suffice. | |
88 | * | |
89 | * Retrieving the time of last login ('lastlog') is in some ways even | |
90 | * more problemmatic than login recording. Some systems provide a | |
91 | * simple table of all users which we seek based on uid and retrieve a | |
92 | * relatively standard structure. Others record the same information in | |
93 | * a directory with a separate file, and others don't record the | |
94 | * information separately at all. For systems in the latter category, | |
95 | * we look backwards in the wtmp or wtmpx file for the last login entry | |
96 | * for our user. Naturally this is slower and on busy systems could | |
97 | * incur a significant performance penalty. | |
98 | * | |
99 | * Calling the new code | |
100 | * -------------------- | |
101 | * | |
102 | * In OpenSSH all login recording and retrieval is performed in | |
103 | * login.c. Here you'll find working examples. Also, in the logintest.c | |
104 | * program there are more examples. | |
105 | * | |
106 | * Internal handler calling method | |
107 | * ------------------------------- | |
108 | * | |
109 | * When a call is made to login_login() or login_logout(), both | |
110 | * routines set a struct logininfo flag defining which action (log in, | |
111 | * or log out) is to be taken. They both then call login_write(), which | |
112 | * calls whichever of the many structure-specific handlers autoconf | |
113 | * selects for the local system. | |
114 | * | |
115 | * The handlers themselves handle system data structure specifics. Both | |
116 | * struct utmp and struct utmpx have utility functions (see | |
117 | * construct_utmp*()) to try to make it simpler to add extra systems | |
118 | * that introduce new features to either structure. | |
119 | * | |
120 | * While it may seem terribly wasteful to replicate so much similar | |
121 | * code for each method, experience has shown that maintaining code to | |
122 | * write both struct utmp and utmpx in one function, whilst maintaining | |
123 | * support for all systems whether they have library support or not, is | |
124 | * a difficult and time-consuming task. | |
125 | * | |
126 | * Lastlog support proceeds similarly. Functions login_get_lastlog() | |
127 | * (and its OpenSSH-tuned friend login_get_lastlog_time()) call | |
128 | * getlast_entry(), which tries one of three methods to find the last | |
129 | * login time. It uses local system lastlog support if it can, | |
130 | * otherwise it tries wtmp or wtmpx before giving up and returning 0, | |
131 | * meaning "tilt". | |
132 | * | |
133 | * Maintenance | |
134 | * ----------- | |
135 | * | |
136 | * In many cases it's possible to tweak autoconf to select the correct | |
137 | * methods for a particular platform, either by improving the detection | |
138 | * code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE | |
139 | * symbols for the platform. | |
140 | * | |
141 | * Use logintest to check which symbols are defined before modifying | |
142 | * configure.ac and loginrec.c. (You have to build logintest yourself | |
143 | * with 'make logintest' as it's not built by default.) | |
144 | * | |
145 | * Otherwise, patches to the specific method(s) are very helpful! | |
146 | */ | |
1d7b9b20 | 147 | |
148 | #include "includes.h" | |
149 | ||
81e73e57 | 150 | #include <sys/types.h> |
151 | #include <sys/stat.h> | |
152 | ||
1d7b9b20 | 153 | #include "ssh.h" |
154 | #include "xmalloc.h" | |
155 | #include "loginrec.h" | |
42f11eb2 | 156 | #include "log.h" |
157 | #include "atomicio.h" | |
b6610e8f | 158 | #include "packet.h" |
159 | #include "canohost.h" | |
c00e4d75 | 160 | #include "auth.h" |
c53d8c93 | 161 | #include "buffer.h" |
1d7b9b20 | 162 | |
44d5f7f7 | 163 | #ifdef HAVE_UTIL_H |
fa64c868 | 164 | # include <util.h> |
44d5f7f7 | 165 | #endif |
166 | ||
8f523d67 | 167 | #ifdef HAVE_LIBUTIL_H |
fa64c868 | 168 | # include <libutil.h> |
8f523d67 | 169 | #endif |
170 | ||
fa64c868 | 171 | RCSID("$Id$"); |
172 | ||
1d7b9b20 | 173 | /** |
174 | ** prototypes for helper functions in this file | |
175 | **/ | |
176 | ||
177 | #if HAVE_UTMP_H | |
1d7b9b20 | 178 | void set_utmp_time(struct logininfo *li, struct utmp *ut); |
179 | void construct_utmp(struct logininfo *li, struct utmp *ut); | |
180 | #endif | |
181 | ||
182 | #ifdef HAVE_UTMPX_H | |
1d7b9b20 | 183 | void set_utmpx_time(struct logininfo *li, struct utmpx *ut); |
184 | void construct_utmpx(struct logininfo *li, struct utmpx *ut); | |
185 | #endif | |
186 | ||
187 | int utmp_write_entry(struct logininfo *li); | |
188 | int utmpx_write_entry(struct logininfo *li); | |
189 | int wtmp_write_entry(struct logininfo *li); | |
190 | int wtmpx_write_entry(struct logininfo *li); | |
191 | int lastlog_write_entry(struct logininfo *li); | |
192 | int syslogin_write_entry(struct logininfo *li); | |
193 | ||
194 | int getlast_entry(struct logininfo *li); | |
195 | int lastlog_get_entry(struct logininfo *li); | |
196 | int wtmp_get_entry(struct logininfo *li); | |
197 | int wtmpx_get_entry(struct logininfo *li); | |
198 | ||
5ccf88cb | 199 | extern Buffer loginmsg; |
200 | ||
5abcdf8e | 201 | /* pick the shortest string */ |
fa64c868 | 202 | #define MIN_SIZEOF(s1,s2) (sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2)) |
5abcdf8e | 203 | |
1d7b9b20 | 204 | /** |
205 | ** platform-independent login functions | |
206 | **/ | |
207 | ||
fa64c868 | 208 | /* |
209 | * login_login(struct logininfo *) - Record a login | |
2b87da3b | 210 | * |
5abcdf8e | 211 | * Call with a pointer to a struct logininfo initialised with |
212 | * login_init_entry() or login_alloc_entry() | |
213 | * | |
214 | * Returns: | |
215 | * >0 if successful | |
216 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
217 | */ | |
564dd50a | 218 | int |
fa64c868 | 219 | login_login(struct logininfo *li) |
564dd50a | 220 | { |
221 | li->type = LTYPE_LOGIN; | |
fa64c868 | 222 | return (login_write(li)); |
564dd50a | 223 | } |
1d7b9b20 | 224 | |
225 | ||
fa64c868 | 226 | /* |
227 | * login_logout(struct logininfo *) - Record a logout | |
5abcdf8e | 228 | * |
229 | * Call as with login_login() | |
230 | * | |
231 | * Returns: | |
232 | * >0 if successful | |
233 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
234 | */ | |
564dd50a | 235 | int |
236 | login_logout(struct logininfo *li) | |
237 | { | |
238 | li->type = LTYPE_LOGOUT; | |
fa64c868 | 239 | return (login_write(li)); |
1d7b9b20 | 240 | } |
241 | ||
fa64c868 | 242 | /* |
243 | * login_get_lastlog_time(int) - Retrieve the last login time | |
5abcdf8e | 244 | * |
245 | * Retrieve the last login time for the given uid. Will try to use the | |
246 | * system lastlog facilities if they are available, but will fall back | |
247 | * to looking in wtmp/wtmpx if necessary | |
248 | * | |
249 | * Returns: | |
250 | * 0 on failure, or if user has never logged in | |
251 | * Time in seconds from the epoch if successful | |
252 | * | |
253 | * Useful preprocessor symbols: | |
254 | * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog | |
255 | * info | |
256 | * USE_LASTLOG: If set, indicates the presence of system lastlog | |
257 | * facilities. If this and DISABLE_LASTLOG are not set, | |
258 | * try to retrieve lastlog information from wtmp/wtmpx. | |
259 | */ | |
564dd50a | 260 | unsigned int |
261 | login_get_lastlog_time(const int uid) | |
262 | { | |
263 | struct logininfo li; | |
1d7b9b20 | 264 | |
5abcdf8e | 265 | if (login_get_lastlog(&li, uid)) |
fa64c868 | 266 | return (li.tv_sec); |
5abcdf8e | 267 | else |
fa64c868 | 268 | return (0); |
564dd50a | 269 | } |
1d7b9b20 | 270 | |
fa64c868 | 271 | /* |
272 | * login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry | |
5abcdf8e | 273 | * |
274 | * Retrieve a logininfo structure populated (only partially) with | |
275 | * information from the system lastlog data, or from wtmp/wtmpx if no | |
276 | * system lastlog information exists. | |
277 | * | |
278 | * Note this routine must be given a pre-allocated logininfo. | |
279 | * | |
280 | * Returns: | |
281 | * >0: A pointer to your struct logininfo if successful | |
282 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
5abcdf8e | 283 | */ |
564dd50a | 284 | struct logininfo * |
285 | login_get_lastlog(struct logininfo *li, const int uid) | |
286 | { | |
5abcdf8e | 287 | struct passwd *pw; |
5abcdf8e | 288 | |
dbaa2e87 | 289 | memset(li, '\0', sizeof(*li)); |
1d7b9b20 | 290 | li->uid = uid; |
5abcdf8e | 291 | |
2b87da3b | 292 | /* |
9f32ceb4 | 293 | * If we don't have a 'real' lastlog, we need the username to |
5abcdf8e | 294 | * reliably search wtmp(x) for the last login (see |
2b87da3b | 295 | * wtmp_get_entry().) |
9f32ceb4 | 296 | */ |
5abcdf8e | 297 | pw = getpwuid(uid); |
a05a70ab | 298 | if (pw == NULL) |
a233586b | 299 | fatal("%s: Cannot find account for uid %i", __func__, uid); |
2b87da3b | 300 | |
1bfbb762 | 301 | /* No MIN_SIZEOF here - we absolutely *must not* truncate the |
fa64c868 | 302 | * username (XXX - so check for trunc!) */ |
d8caae24 | 303 | strlcpy(li->username, pw->pw_name, sizeof(li->username)); |
a05a70ab | 304 | |
564dd50a | 305 | if (getlast_entry(li)) |
fa64c868 | 306 | return (li); |
564dd50a | 307 | else |
fa64c868 | 308 | return (NULL); |
1d7b9b20 | 309 | } |
310 | ||
1d7b9b20 | 311 | |
fa64c868 | 312 | /* |
313 | * login_alloc_entry(int, char*, char*, char*) - Allocate and initialise | |
2b87da3b | 314 | * a logininfo structure |
315 | * | |
5abcdf8e | 316 | * This function creates a new struct logininfo, a data structure |
317 | * meant to carry the information required to portably record login info. | |
318 | * | |
319 | * Returns a pointer to a newly created struct logininfo. If memory | |
320 | * allocation fails, the program halts. | |
321 | */ | |
564dd50a | 322 | struct |
323 | logininfo *login_alloc_entry(int pid, const char *username, | |
fa64c868 | 324 | const char *hostname, const char *line) |
564dd50a | 325 | { |
326 | struct logininfo *newli; | |
1d7b9b20 | 327 | |
fa64c868 | 328 | newli = xmalloc(sizeof(*newli)); |
329 | login_init_entry(newli, pid, username, hostname, line); | |
330 | return (newli); | |
1d7b9b20 | 331 | } |
332 | ||
333 | ||
5abcdf8e | 334 | /* login_free_entry(struct logininfo *) - free struct memory */ |
1d7b9b20 | 335 | void |
564dd50a | 336 | login_free_entry(struct logininfo *li) |
337 | { | |
338 | xfree(li); | |
1d7b9b20 | 339 | } |
340 | ||
341 | ||
5abcdf8e | 342 | /* login_init_entry(struct logininfo *, int, char*, char*, char*) |
343 | * - initialise a struct logininfo | |
2b87da3b | 344 | * |
5abcdf8e | 345 | * Populates a new struct logininfo, a data structure meant to carry |
346 | * the information required to portably record login info. | |
347 | * | |
348 | * Returns: 1 | |
349 | */ | |
564dd50a | 350 | int |
2b87da3b | 351 | login_init_entry(struct logininfo *li, int pid, const char *username, |
fa64c868 | 352 | const char *hostname, const char *line) |
564dd50a | 353 | { |
d8caae24 | 354 | struct passwd *pw; |
2b87da3b | 355 | |
dbaa2e87 | 356 | memset(li, 0, sizeof(*li)); |
2b87da3b | 357 | |
564dd50a | 358 | li->pid = pid; |
d8caae24 | 359 | |
564dd50a | 360 | /* set the line information */ |
361 | if (line) | |
362 | line_fullname(li->line, line, sizeof(li->line)); | |
1d7b9b20 | 363 | |
d8caae24 | 364 | if (username) { |
564dd50a | 365 | strlcpy(li->username, username, sizeof(li->username)); |
d8caae24 | 366 | pw = getpwnam(li->username); |
fa64c868 | 367 | if (pw == NULL) { |
d1cf9a87 | 368 | fatal("%s: Cannot find user \"%s\"", __func__, |
fa64c868 | 369 | li->username); |
370 | } | |
d8caae24 | 371 | li->uid = pw->pw_uid; |
372 | } | |
a05a70ab | 373 | |
564dd50a | 374 | if (hostname) |
375 | strlcpy(li->hostname, hostname, sizeof(li->hostname)); | |
d8caae24 | 376 | |
fa64c868 | 377 | return (1); |
1d7b9b20 | 378 | } |
379 | ||
d1cf9a87 | 380 | /* |
fa64c868 | 381 | * login_set_current_time(struct logininfo *) - set the current time |
5abcdf8e | 382 | * |
383 | * Set the current time in a logininfo structure. This function is | |
384 | * meant to eliminate the need to deal with system dependencies for | |
385 | * time handling. | |
386 | */ | |
1d7b9b20 | 387 | void |
564dd50a | 388 | login_set_current_time(struct logininfo *li) |
389 | { | |
1d7b9b20 | 390 | struct timeval tv; |
391 | ||
392 | gettimeofday(&tv, NULL); | |
2b87da3b | 393 | |
d8caae24 | 394 | li->tv_sec = tv.tv_sec; |
395 | li->tv_usec = tv.tv_usec; | |
1d7b9b20 | 396 | } |
397 | ||
564dd50a | 398 | /* copy a sockaddr_* into our logininfo */ |
1d7b9b20 | 399 | void |
564dd50a | 400 | login_set_addr(struct logininfo *li, const struct sockaddr *sa, |
fa64c868 | 401 | const unsigned int sa_size) |
564dd50a | 402 | { |
403 | unsigned int bufsize = sa_size; | |
404 | ||
405 | /* make sure we don't overrun our union */ | |
406 | if (sizeof(li->hostaddr) < sa_size) | |
407 | bufsize = sizeof(li->hostaddr); | |
408 | ||
fa64c868 | 409 | memcpy(&li->hostaddr.sa, sa, bufsize); |
1d7b9b20 | 410 | } |
1d7b9b20 | 411 | |
564dd50a | 412 | |
413 | /** | |
414 | ** login_write: Call low-level recording functions based on autoconf | |
415 | ** results | |
416 | **/ | |
1d7b9b20 | 417 | int |
fa64c868 | 418 | login_write(struct logininfo *li) |
564dd50a | 419 | { |
3c62e7eb | 420 | #ifndef HAVE_CYGWIN |
fa64c868 | 421 | if (geteuid() != 0) { |
422 | logit("Attempt to write login records by non-root user (aborting)"); | |
423 | return (1); | |
1d7b9b20 | 424 | } |
3c62e7eb | 425 | #endif |
a05a70ab | 426 | |
1d7b9b20 | 427 | /* set the timestamp */ |
428 | login_set_current_time(li); | |
429 | #ifdef USE_LOGIN | |
430 | syslogin_write_entry(li); | |
431 | #endif | |
432 | #ifdef USE_LASTLOG | |
fa64c868 | 433 | if (li->type == LTYPE_LOGIN) |
1d7b9b20 | 434 | lastlog_write_entry(li); |
1d7b9b20 | 435 | #endif |
436 | #ifdef USE_UTMP | |
437 | utmp_write_entry(li); | |
438 | #endif | |
439 | #ifdef USE_WTMP | |
440 | wtmp_write_entry(li); | |
441 | #endif | |
442 | #ifdef USE_UTMPX | |
443 | utmpx_write_entry(li); | |
444 | #endif | |
445 | #ifdef USE_WTMPX | |
446 | wtmpx_write_entry(li); | |
f5ed3301 | 447 | #endif |
448 | #ifdef CUSTOM_SYS_AUTH_RECORD_LOGIN | |
d1cf9a87 | 449 | if (li->type == LTYPE_LOGIN && |
98c044d0 | 450 | !sys_auth_record_login(li->username,li->hostname,li->line, |
451 | &loginmsg)) | |
f5ed3301 | 452 | logit("Writing login record failed for %s", li->username); |
c00e4d75 | 453 | #endif |
6039eeef | 454 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 455 | if (li->type == LTYPE_LOGIN) |
456 | audit_session_open(li->line); | |
457 | else if (li->type == LTYPE_LOGOUT) | |
458 | audit_session_close(li->line); | |
1d7b9b20 | 459 | #endif |
fa64c868 | 460 | return (0); |
1d7b9b20 | 461 | } |
462 | ||
7e2d5fa4 | 463 | #ifdef LOGIN_NEEDS_UTMPX |
464 | int | |
465 | login_utmp_only(struct logininfo *li) | |
466 | { | |
aff51935 | 467 | li->type = LTYPE_LOGIN; |
9e127e27 | 468 | login_set_current_time(li); |
7e2d5fa4 | 469 | # ifdef USE_UTMP |
470 | utmp_write_entry(li); | |
471 | # endif | |
472 | # ifdef USE_WTMP | |
473 | wtmp_write_entry(li); | |
474 | # endif | |
475 | # ifdef USE_UTMPX | |
476 | utmpx_write_entry(li); | |
477 | # endif | |
478 | # ifdef USE_WTMPX | |
479 | wtmpx_write_entry(li); | |
480 | # endif | |
fa64c868 | 481 | return (0); |
7e2d5fa4 | 482 | } |
483 | #endif | |
484 | ||
564dd50a | 485 | /** |
486 | ** getlast_entry: Call low-level functions to retrieve the last login | |
487 | ** time. | |
488 | **/ | |
1d7b9b20 | 489 | |
564dd50a | 490 | /* take the uid in li and return the last login time */ |
1d7b9b20 | 491 | int |
564dd50a | 492 | getlast_entry(struct logininfo *li) |
493 | { | |
494 | #ifdef USE_LASTLOG | |
9f32ceb4 | 495 | return(lastlog_get_entry(li)); |
a05a70ab | 496 | #else /* !USE_LASTLOG */ |
1d7b9b20 | 497 | |
fa64c868 | 498 | #if defined(DISABLE_LASTLOG) |
2b87da3b | 499 | /* On some systems we shouldn't even try to obtain last login |
3f45f1c3 | 500 | * time, e.g. AIX */ |
fa64c868 | 501 | return (0); |
502 | # elif defined(USE_WTMP) && \ | |
503 | (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) | |
564dd50a | 504 | /* retrieve last login time from utmp */ |
a05a70ab | 505 | return (wtmp_get_entry(li)); |
fa64c868 | 506 | # elif defined(USE_WTMPX) && \ |
507 | (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX)) | |
564dd50a | 508 | /* If wtmp isn't available, try wtmpx */ |
a05a70ab | 509 | return (wtmpx_get_entry(li)); |
fa64c868 | 510 | # else |
564dd50a | 511 | /* Give up: No means of retrieving last login time */ |
fa64c868 | 512 | return (0); |
2b87da3b | 513 | # endif /* DISABLE_LASTLOG */ |
a05a70ab | 514 | #endif /* USE_LASTLOG */ |
564dd50a | 515 | } |
1d7b9b20 | 516 | |
517 | ||
1d7b9b20 | 518 | |
519 | /* | |
564dd50a | 520 | * 'line' string utility functions |
521 | * | |
522 | * These functions process the 'line' string into one of three forms: | |
523 | * | |
1d7b9b20 | 524 | * 1. The full filename (including '/dev') |
525 | * 2. The stripped name (excluding '/dev') | |
564dd50a | 526 | * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00 |
527 | * /dev/pts/1 -> ts/1 ) | |
1d7b9b20 | 528 | * |
529 | * Form 3 is used on some systems to identify a .tmp.? entry when | |
530 | * attempting to remove it. Typically both addition and removal is | |
564dd50a | 531 | * performed by one application - say, sshd - so as long as the choice |
532 | * uniquely identifies a terminal it's ok. | |
1d7b9b20 | 533 | */ |
534 | ||
535 | ||
fa64c868 | 536 | /* |
537 | * line_fullname(): add the leading '/dev/' if it doesn't exist make | |
538 | * sure dst has enough space, if not just copy src (ugh) | |
539 | */ | |
1d7b9b20 | 540 | char * |
44d71ad5 | 541 | line_fullname(char *dst, const char *src, u_int dstsize) |
564dd50a | 542 | { |
1d7b9b20 | 543 | memset(dst, '\0', dstsize); |
fa64c868 | 544 | if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) |
1d7b9b20 | 545 | strlcpy(dst, src, dstsize); |
fa64c868 | 546 | else { |
a4d05724 | 547 | strlcpy(dst, "/dev/", dstsize); |
1d7b9b20 | 548 | strlcat(dst, src, dstsize); |
549 | } | |
fa64c868 | 550 | return (dst); |
1d7b9b20 | 551 | } |
552 | ||
564dd50a | 553 | /* line_stripname(): strip the leading '/dev' if it exists, return dst */ |
1d7b9b20 | 554 | char * |
564dd50a | 555 | line_stripname(char *dst, const char *src, int dstsize) |
556 | { | |
1d7b9b20 | 557 | memset(dst, '\0', dstsize); |
558 | if (strncmp(src, "/dev/", 5) == 0) | |
89d7510a | 559 | strlcpy(dst, src + 5, dstsize); |
1d7b9b20 | 560 | else |
561 | strlcpy(dst, src, dstsize); | |
fa64c868 | 562 | return (dst); |
564dd50a | 563 | } |
564 | ||
d1cf9a87 | 565 | /* |
fa64c868 | 566 | * line_abbrevname(): Return the abbreviated (usually four-character) |
564dd50a | 567 | * form of the line (Just use the last <dstsize> characters of the |
568 | * full name.) | |
569 | * | |
570 | * NOTE: use strncpy because we do NOT necessarily want zero | |
fa64c868 | 571 | * termination |
572 | */ | |
1d7b9b20 | 573 | char * |
2b87da3b | 574 | line_abbrevname(char *dst, const char *src, int dstsize) |
a05a70ab | 575 | { |
576 | size_t len; | |
2b87da3b | 577 | |
1d7b9b20 | 578 | memset(dst, '\0', dstsize); |
2b87da3b | 579 | |
daaff4d5 | 580 | /* Always skip prefix if present */ |
581 | if (strncmp(src, "/dev/", 5) == 0) | |
582 | src += 5; | |
2b87da3b | 583 | |
0e8f4eba | 584 | #ifdef WITH_ABBREV_NO_TTY |
585 | if (strncmp(src, "tty", 3) == 0) | |
586 | src += 3; | |
587 | #endif | |
588 | ||
a05a70ab | 589 | len = strlen(src); |
590 | ||
daaff4d5 | 591 | if (len > 0) { |
592 | if (((int)len - dstsize) > 0) | |
593 | src += ((int)len - dstsize); | |
594 | ||
595 | /* note: _don't_ change this to strlcpy */ | |
2b87da3b | 596 | strncpy(dst, src, (size_t)dstsize); |
a05a70ab | 597 | } |
2b87da3b | 598 | |
fa64c868 | 599 | return (dst); |
1d7b9b20 | 600 | } |
601 | ||
1d7b9b20 | 602 | /** |
603 | ** utmp utility functions | |
564dd50a | 604 | ** |
605 | ** These functions manipulate struct utmp, taking system differences | |
606 | ** into account. | |
1d7b9b20 | 607 | **/ |
608 | ||
609 | #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) | |
610 | ||
1d7b9b20 | 611 | /* build the utmp structure */ |
612 | void | |
564dd50a | 613 | set_utmp_time(struct logininfo *li, struct utmp *ut) |
614 | { | |
fa64c868 | 615 | # if defined(HAVE_TV_IN_UTMP) |
1d7b9b20 | 616 | ut->ut_tv.tv_sec = li->tv_sec; |
617 | ut->ut_tv.tv_usec = li->tv_usec; | |
fa64c868 | 618 | # elif defined(HAVE_TIME_IN_UTMP) |
1d7b9b20 | 619 | ut->ut_time = li->tv_sec; |
a05a70ab | 620 | # endif |
1d7b9b20 | 621 | } |
622 | ||
623 | void | |
624 | construct_utmp(struct logininfo *li, | |
564dd50a | 625 | struct utmp *ut) |
626 | { | |
9746ee4b | 627 | # ifdef HAVE_ADDR_V6_IN_UTMP |
628 | struct sockaddr_in6 *sa6; | |
fa64c868 | 629 | # endif |
630 | ||
dbaa2e87 | 631 | memset(ut, '\0', sizeof(*ut)); |
5abcdf8e | 632 | |
633 | /* First fill out fields used for both logins and logouts */ | |
634 | ||
a05a70ab | 635 | # ifdef HAVE_ID_IN_UTMP |
1d7b9b20 | 636 | line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); |
a05a70ab | 637 | # endif |
1d7b9b20 | 638 | |
a05a70ab | 639 | # ifdef HAVE_TYPE_IN_UTMP |
5abcdf8e | 640 | /* This is done here to keep utmp constants out of struct logininfo */ |
1d7b9b20 | 641 | switch (li->type) { |
642 | case LTYPE_LOGIN: | |
643 | ut->ut_type = USER_PROCESS; | |
ef51930f | 644 | #ifdef _UNICOS |
1a23ac2c | 645 | cray_set_tmpdir(ut); |
646 | #endif | |
1d7b9b20 | 647 | break; |
648 | case LTYPE_LOGOUT: | |
649 | ut->ut_type = DEAD_PROCESS; | |
ef51930f | 650 | #ifdef _UNICOS |
1a23ac2c | 651 | cray_retain_utmp(ut, li->pid); |
652 | #endif | |
1d7b9b20 | 653 | break; |
654 | } | |
a05a70ab | 655 | # endif |
5abcdf8e | 656 | set_utmp_time(li, ut); |
1d7b9b20 | 657 | |
5abcdf8e | 658 | line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); |
a05a70ab | 659 | |
660 | # ifdef HAVE_PID_IN_UTMP | |
1d7b9b20 | 661 | ut->ut_pid = li->pid; |
a05a70ab | 662 | # endif |
5abcdf8e | 663 | |
664 | /* If we're logging out, leave all other fields blank */ | |
665 | if (li->type == LTYPE_LOGOUT) | |
fa64c868 | 666 | return; |
5abcdf8e | 667 | |
a05a70ab | 668 | /* |
669 | * These fields are only used when logging in, and are blank | |
2b87da3b | 670 | * for logouts. |
a05a70ab | 671 | */ |
5abcdf8e | 672 | |
673 | /* Use strncpy because we don't necessarily want null termination */ | |
fa64c868 | 674 | strncpy(ut->ut_name, li->username, |
675 | MIN_SIZEOF(ut->ut_name, li->username)); | |
a05a70ab | 676 | # ifdef HAVE_HOST_IN_UTMP |
fa64c868 | 677 | strncpy(ut->ut_host, li->hostname, |
678 | MIN_SIZEOF(ut->ut_host, li->hostname)); | |
a05a70ab | 679 | # endif |
680 | # ifdef HAVE_ADDR_IN_UTMP | |
564dd50a | 681 | /* this is just a 32-bit IP address */ |
682 | if (li->hostaddr.sa.sa_family == AF_INET) | |
683 | ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
2b87da3b | 684 | # endif |
9746ee4b | 685 | # ifdef HAVE_ADDR_V6_IN_UTMP |
686 | /* this is just a 128-bit IPv6 address */ | |
687 | if (li->hostaddr.sa.sa_family == AF_INET6) { | |
688 | sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); | |
689 | memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); | |
690 | if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { | |
691 | ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; | |
692 | ut->ut_addr_v6[1] = 0; | |
693 | ut->ut_addr_v6[2] = 0; | |
694 | ut->ut_addr_v6[3] = 0; | |
695 | } | |
696 | } | |
697 | # endif | |
564dd50a | 698 | } |
a05a70ab | 699 | #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */ |
564dd50a | 700 | |
1d7b9b20 | 701 | /** |
702 | ** utmpx utility functions | |
564dd50a | 703 | ** |
704 | ** These functions manipulate struct utmpx, accounting for system | |
705 | ** variations. | |
1d7b9b20 | 706 | **/ |
707 | ||
708 | #if defined(USE_UTMPX) || defined (USE_WTMPX) | |
1d7b9b20 | 709 | /* build the utmpx structure */ |
710 | void | |
564dd50a | 711 | set_utmpx_time(struct logininfo *li, struct utmpx *utx) |
712 | { | |
fa64c868 | 713 | # if defined(HAVE_TV_IN_UTMPX) |
1d7b9b20 | 714 | utx->ut_tv.tv_sec = li->tv_sec; |
715 | utx->ut_tv.tv_usec = li->tv_usec; | |
fa64c868 | 716 | # elif defined(HAVE_TIME_IN_UTMPX) |
1d7b9b20 | 717 | utx->ut_time = li->tv_sec; |
fa64c868 | 718 | # endif |
1d7b9b20 | 719 | } |
720 | ||
721 | void | |
564dd50a | 722 | construct_utmpx(struct logininfo *li, struct utmpx *utx) |
723 | { | |
9746ee4b | 724 | # ifdef HAVE_ADDR_V6_IN_UTMP |
725 | struct sockaddr_in6 *sa6; | |
726 | # endif | |
dbaa2e87 | 727 | memset(utx, '\0', sizeof(*utx)); |
fa64c868 | 728 | |
daaff4d5 | 729 | # ifdef HAVE_ID_IN_UTMPX |
1d7b9b20 | 730 | line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); |
daaff4d5 | 731 | # endif |
1d7b9b20 | 732 | |
733 | /* this is done here to keep utmp constants out of loginrec.h */ | |
734 | switch (li->type) { | |
735 | case LTYPE_LOGIN: | |
736 | utx->ut_type = USER_PROCESS; | |
737 | break; | |
738 | case LTYPE_LOGOUT: | |
739 | utx->ut_type = DEAD_PROCESS; | |
740 | break; | |
741 | } | |
1d7b9b20 | 742 | line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); |
1d7b9b20 | 743 | set_utmpx_time(li, utx); |
5abcdf8e | 744 | utx->ut_pid = li->pid; |
fa64c868 | 745 | |
f3837bc6 | 746 | /* strncpy(): Don't necessarily want null termination */ |
fa64c868 | 747 | strncpy(utx->ut_name, li->username, |
748 | MIN_SIZEOF(utx->ut_name, li->username)); | |
5abcdf8e | 749 | |
750 | if (li->type == LTYPE_LOGOUT) | |
751 | return; | |
752 | ||
a05a70ab | 753 | /* |
754 | * These fields are only used when logging in, and are blank | |
2b87da3b | 755 | * for logouts. |
a05a70ab | 756 | */ |
5abcdf8e | 757 | |
a05a70ab | 758 | # ifdef HAVE_HOST_IN_UTMPX |
fa64c868 | 759 | strncpy(utx->ut_host, li->hostname, |
760 | MIN_SIZEOF(utx->ut_host, li->hostname)); | |
a05a70ab | 761 | # endif |
762 | # ifdef HAVE_ADDR_IN_UTMPX | |
764d4113 | 763 | /* this is just a 32-bit IP address */ |
764 | if (li->hostaddr.sa.sa_family == AF_INET) | |
765 | utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
a05a70ab | 766 | # endif |
9746ee4b | 767 | # ifdef HAVE_ADDR_V6_IN_UTMP |
768 | /* this is just a 128-bit IPv6 address */ | |
769 | if (li->hostaddr.sa.sa_family == AF_INET6) { | |
770 | sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); | |
771 | memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); | |
772 | if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { | |
773 | ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; | |
774 | ut->ut_addr_v6[1] = 0; | |
775 | ut->ut_addr_v6[2] = 0; | |
776 | ut->ut_addr_v6[3] = 0; | |
777 | } | |
778 | } | |
779 | # endif | |
a05a70ab | 780 | # ifdef HAVE_SYSLEN_IN_UTMPX |
5abcdf8e | 781 | /* ut_syslen is the length of the utx_host string */ |
782 | utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host)); | |
a05a70ab | 783 | # endif |
564dd50a | 784 | } |
a05a70ab | 785 | #endif /* USE_UTMPX || USE_WTMPX */ |
1d7b9b20 | 786 | |
787 | /** | |
564dd50a | 788 | ** Low-level utmp functions |
1d7b9b20 | 789 | **/ |
790 | ||
791 | /* FIXME: (ATL) utmp_write_direct needs testing */ | |
1d7b9b20 | 792 | #ifdef USE_UTMP |
793 | ||
1d7b9b20 | 794 | /* if we can, use pututline() etc. */ |
a05a70ab | 795 | # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ |
796 | defined(HAVE_PUTUTLINE) | |
1d7b9b20 | 797 | # define UTMP_USE_LIBRARY |
a05a70ab | 798 | # endif |
1d7b9b20 | 799 | |
800 | ||
801 | /* write a utmp entry with the system's help (pututline() and pals) */ | |
a05a70ab | 802 | # ifdef UTMP_USE_LIBRARY |
1d7b9b20 | 803 | static int |
564dd50a | 804 | utmp_write_library(struct logininfo *li, struct utmp *ut) |
805 | { | |
1d7b9b20 | 806 | setutent(); |
807 | pututline(ut); | |
a05a70ab | 808 | # ifdef HAVE_ENDUTENT |
1d7b9b20 | 809 | endutent(); |
a05a70ab | 810 | # endif |
fa64c868 | 811 | return (1); |
564dd50a | 812 | } |
a05a70ab | 813 | # else /* UTMP_USE_LIBRARY */ |
1d7b9b20 | 814 | |
d1cf9a87 | 815 | /* |
fa64c868 | 816 | * Write a utmp entry direct to the file |
817 | * This is a slightly modification of code in OpenBSD's login.c | |
818 | */ | |
1d7b9b20 | 819 | static int |
564dd50a | 820 | utmp_write_direct(struct logininfo *li, struct utmp *ut) |
821 | { | |
1d7b9b20 | 822 | struct utmp old_ut; |
823 | register int fd; | |
824 | int tty; | |
825 | ||
5abcdf8e | 826 | /* FIXME: (ATL) ttyslot() needs local implementation */ |
dbaa2e87 | 827 | |
698d107e | 828 | #if defined(HAVE_GETTTYENT) |
fa64c868 | 829 | struct ttyent *ty; |
dbaa2e87 | 830 | |
831 | tty=0; | |
dbaa2e87 | 832 | setttyent(); |
fa64c868 | 833 | while (NULL != (ty = getttyent())) { |
dbaa2e87 | 834 | tty++; |
835 | if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line))) | |
836 | break; | |
837 | } | |
838 | endttyent(); | |
839 | ||
fa64c868 | 840 | if (NULL == ty) { |
5f12e050 | 841 | logit("%s: tty not found", __func__); |
842 | return (0); | |
dbaa2e87 | 843 | } |
844 | #else /* FIXME */ | |
845 | ||
1d7b9b20 | 846 | tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ |
847 | ||
698d107e | 848 | #endif /* HAVE_GETTTYENT */ |
dbaa2e87 | 849 | |
1d7b9b20 | 850 | if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { |
5f12e050 | 851 | off_t pos, ret; |
852 | ||
853 | pos = (off_t)tty * sizeof(struct utmp); | |
854 | if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { | |
f6d20d59 | 855 | logit("%s: lseek: %s", __func__, strerror(errno)); |
5f12e050 | 856 | return (0); |
857 | } | |
858 | if (ret != pos) { | |
d1cf9a87 | 859 | logit("%s: Couldn't seek to tty %d slot in %s", |
f6d20d59 | 860 | __func__, tty, UTMP_FILE); |
5f12e050 | 861 | return (0); |
862 | } | |
1d7b9b20 | 863 | /* |
864 | * Prevent luser from zero'ing out ut_host. | |
865 | * If the new ut_line is empty but the old one is not | |
dc2a6d09 | 866 | * and ut_line and ut_name match, preserve the old ut_line. |
1d7b9b20 | 867 | */ |
2b87da3b | 868 | if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) && |
fa64c868 | 869 | (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') && |
870 | (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) && | |
871 | (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) | |
872 | memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); | |
2b87da3b | 873 | |
5f12e050 | 874 | if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { |
f6d20d59 | 875 | logit("%s: lseek: %s", __func__, strerror(errno)); |
5f12e050 | 876 | return (0); |
877 | } | |
878 | if (ret != pos) { | |
f6d20d59 | 879 | logit("%s: Couldn't seek to tty %d slot in %s", |
5f12e050 | 880 | __func__, tty, UTMP_FILE); |
881 | return (0); | |
882 | } | |
fa64c868 | 883 | if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { |
5f12e050 | 884 | logit("%s: error writing %s: %s", __func__, |
5abcdf8e | 885 | UTMP_FILE, strerror(errno)); |
fa64c868 | 886 | } |
2b87da3b | 887 | |
fa64c868 | 888 | close(fd); |
889 | return (1); | |
9f32ceb4 | 890 | } else { |
fa64c868 | 891 | return (0); |
9f32ceb4 | 892 | } |
564dd50a | 893 | } |
a05a70ab | 894 | # endif /* UTMP_USE_LIBRARY */ |
1d7b9b20 | 895 | |
896 | static int | |
564dd50a | 897 | utmp_perform_login(struct logininfo *li) |
898 | { | |
1d7b9b20 | 899 | struct utmp ut; |
900 | ||
901 | construct_utmp(li, &ut); | |
a05a70ab | 902 | # ifdef UTMP_USE_LIBRARY |
1d7b9b20 | 903 | if (!utmp_write_library(li, &ut)) { |
a233586b | 904 | logit("%s: utmp_write_library() failed", __func__); |
fa64c868 | 905 | return (0); |
1d7b9b20 | 906 | } |
a05a70ab | 907 | # else |
1d7b9b20 | 908 | if (!utmp_write_direct(li, &ut)) { |
a233586b | 909 | logit("%s: utmp_write_direct() failed", __func__); |
fa64c868 | 910 | return (0); |
1d7b9b20 | 911 | } |
a05a70ab | 912 | # endif |
fa64c868 | 913 | return (1); |
564dd50a | 914 | } |
1d7b9b20 | 915 | |
916 | ||
917 | static int | |
564dd50a | 918 | utmp_perform_logout(struct logininfo *li) |
919 | { | |
1d7b9b20 | 920 | struct utmp ut; |
921 | ||
5abcdf8e | 922 | construct_utmp(li, &ut); |
a05a70ab | 923 | # ifdef UTMP_USE_LIBRARY |
5abcdf8e | 924 | if (!utmp_write_library(li, &ut)) { |
a233586b | 925 | logit("%s: utmp_write_library() failed", __func__); |
fa64c868 | 926 | return (0); |
5abcdf8e | 927 | } |
a05a70ab | 928 | # else |
5abcdf8e | 929 | if (!utmp_write_direct(li, &ut)) { |
a233586b | 930 | logit("%s: utmp_write_direct() failed", __func__); |
fa64c868 | 931 | return (0); |
5abcdf8e | 932 | } |
a05a70ab | 933 | # endif |
fa64c868 | 934 | return (1); |
564dd50a | 935 | } |
1d7b9b20 | 936 | |
937 | ||
938 | int | |
564dd50a | 939 | utmp_write_entry(struct logininfo *li) |
940 | { | |
1d7b9b20 | 941 | switch(li->type) { |
942 | case LTYPE_LOGIN: | |
fa64c868 | 943 | return (utmp_perform_login(li)); |
1d7b9b20 | 944 | |
945 | case LTYPE_LOGOUT: | |
fa64c868 | 946 | return (utmp_perform_logout(li)); |
1d7b9b20 | 947 | |
948 | default: | |
a233586b | 949 | logit("%s: invalid type field", __func__); |
fa64c868 | 950 | return (0); |
1d7b9b20 | 951 | } |
564dd50a | 952 | } |
a05a70ab | 953 | #endif /* USE_UTMP */ |
1d7b9b20 | 954 | |
955 | ||
956 | /** | |
564dd50a | 957 | ** Low-level utmpx functions |
1d7b9b20 | 958 | **/ |
959 | ||
960 | /* not much point if we don't want utmpx entries */ | |
961 | #ifdef USE_UTMPX | |
962 | ||
1d7b9b20 | 963 | /* if we have the wherewithall, use pututxline etc. */ |
a05a70ab | 964 | # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \ |
965 | defined(HAVE_PUTUTXLINE) | |
1d7b9b20 | 966 | # define UTMPX_USE_LIBRARY |
a05a70ab | 967 | # endif |
1d7b9b20 | 968 | |
969 | ||
970 | /* write a utmpx entry with the system's help (pututxline() and pals) */ | |
a05a70ab | 971 | # ifdef UTMPX_USE_LIBRARY |
1d7b9b20 | 972 | static int |
564dd50a | 973 | utmpx_write_library(struct logininfo *li, struct utmpx *utx) |
974 | { | |
1d7b9b20 | 975 | setutxent(); |
976 | pututxline(utx); | |
977 | ||
a05a70ab | 978 | # ifdef HAVE_ENDUTXENT |
1d7b9b20 | 979 | endutxent(); |
a05a70ab | 980 | # endif |
fa64c868 | 981 | return (1); |
564dd50a | 982 | } |
1d7b9b20 | 983 | |
a05a70ab | 984 | # else /* UTMPX_USE_LIBRARY */ |
1d7b9b20 | 985 | |
986 | /* write a utmp entry direct to the file */ | |
987 | static int | |
564dd50a | 988 | utmpx_write_direct(struct logininfo *li, struct utmpx *utx) |
2b87da3b | 989 | { |
a233586b | 990 | logit("%s: not implemented!", __func__); |
fa64c868 | 991 | return (0); |
564dd50a | 992 | } |
a05a70ab | 993 | # endif /* UTMPX_USE_LIBRARY */ |
1d7b9b20 | 994 | |
995 | static int | |
564dd50a | 996 | utmpx_perform_login(struct logininfo *li) |
997 | { | |
1d7b9b20 | 998 | struct utmpx utx; |
999 | ||
1000 | construct_utmpx(li, &utx); | |
a05a70ab | 1001 | # ifdef UTMPX_USE_LIBRARY |
1d7b9b20 | 1002 | if (!utmpx_write_library(li, &utx)) { |
a233586b | 1003 | logit("%s: utmp_write_library() failed", __func__); |
fa64c868 | 1004 | return (0); |
1d7b9b20 | 1005 | } |
a05a70ab | 1006 | # else |
1d7b9b20 | 1007 | if (!utmpx_write_direct(li, &ut)) { |
a233586b | 1008 | logit("%s: utmp_write_direct() failed", __func__); |
fa64c868 | 1009 | return (0); |
1d7b9b20 | 1010 | } |
a05a70ab | 1011 | # endif |
fa64c868 | 1012 | return (1); |
564dd50a | 1013 | } |
1d7b9b20 | 1014 | |
1015 | ||
1016 | static int | |
564dd50a | 1017 | utmpx_perform_logout(struct logininfo *li) |
1018 | { | |
1d7b9b20 | 1019 | struct utmpx utx; |
1020 | ||
f3837bc6 | 1021 | construct_utmpx(li, &utx); |
a05a70ab | 1022 | # ifdef HAVE_ID_IN_UTMPX |
1d7b9b20 | 1023 | line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); |
a05a70ab | 1024 | # endif |
1025 | # ifdef HAVE_TYPE_IN_UTMPX | |
1d7b9b20 | 1026 | utx.ut_type = DEAD_PROCESS; |
a05a70ab | 1027 | # endif |
1d7b9b20 | 1028 | |
a05a70ab | 1029 | # ifdef UTMPX_USE_LIBRARY |
1d7b9b20 | 1030 | utmpx_write_library(li, &utx); |
a05a70ab | 1031 | # else |
1d7b9b20 | 1032 | utmpx_write_direct(li, &utx); |
a05a70ab | 1033 | # endif |
fa64c868 | 1034 | return (1); |
564dd50a | 1035 | } |
1d7b9b20 | 1036 | |
1d7b9b20 | 1037 | int |
564dd50a | 1038 | utmpx_write_entry(struct logininfo *li) |
1039 | { | |
1d7b9b20 | 1040 | switch(li->type) { |
1041 | case LTYPE_LOGIN: | |
fa64c868 | 1042 | return (utmpx_perform_login(li)); |
1d7b9b20 | 1043 | case LTYPE_LOGOUT: |
fa64c868 | 1044 | return (utmpx_perform_logout(li)); |
1d7b9b20 | 1045 | default: |
a233586b | 1046 | logit("%s: invalid type field", __func__); |
fa64c868 | 1047 | return (0); |
1d7b9b20 | 1048 | } |
564dd50a | 1049 | } |
a05a70ab | 1050 | #endif /* USE_UTMPX */ |
1d7b9b20 | 1051 | |
1052 | ||
1053 | /** | |
564dd50a | 1054 | ** Low-level wtmp functions |
1d7b9b20 | 1055 | **/ |
1056 | ||
2b87da3b | 1057 | #ifdef USE_WTMP |
1d7b9b20 | 1058 | |
d1cf9a87 | 1059 | /* |
fa64c868 | 1060 | * Write a wtmp entry direct to the end of the file |
1061 | * This is a slight modification of code in OpenBSD's logwtmp.c | |
1062 | */ | |
1d7b9b20 | 1063 | static int |
564dd50a | 1064 | wtmp_write(struct logininfo *li, struct utmp *ut) |
1065 | { | |
1d7b9b20 | 1066 | struct stat buf; |
1067 | int fd, ret = 1; | |
1068 | ||
1069 | if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
a233586b | 1070 | logit("%s: problem writing %s: %s", __func__, |
1d7b9b20 | 1071 | WTMP_FILE, strerror(errno)); |
fa64c868 | 1072 | return (0); |
1d7b9b20 | 1073 | } |
2b87da3b | 1074 | if (fstat(fd, &buf) == 0) |
d72f7b79 | 1075 | if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { |
1d7b9b20 | 1076 | ftruncate(fd, buf.st_size); |
a233586b | 1077 | logit("%s: problem writing %s: %s", __func__, |
1d7b9b20 | 1078 | WTMP_FILE, strerror(errno)); |
1079 | ret = 0; | |
1080 | } | |
fa64c868 | 1081 | close(fd); |
1082 | return (ret); | |
564dd50a | 1083 | } |
1d7b9b20 | 1084 | |
1d7b9b20 | 1085 | static int |
a05a70ab | 1086 | wtmp_perform_login(struct logininfo *li) |
1087 | { | |
1d7b9b20 | 1088 | struct utmp ut; |
1089 | ||
1090 | construct_utmp(li, &ut); | |
fa64c868 | 1091 | return (wtmp_write(li, &ut)); |
564dd50a | 1092 | } |
1d7b9b20 | 1093 | |
1094 | ||
1095 | static int | |
564dd50a | 1096 | wtmp_perform_logout(struct logininfo *li) |
1097 | { | |
1d7b9b20 | 1098 | struct utmp ut; |
1099 | ||
1100 | construct_utmp(li, &ut); | |
fa64c868 | 1101 | return (wtmp_write(li, &ut)); |
564dd50a | 1102 | } |
1d7b9b20 | 1103 | |
1104 | ||
1105 | int | |
564dd50a | 1106 | wtmp_write_entry(struct logininfo *li) |
1107 | { | |
1d7b9b20 | 1108 | switch(li->type) { |
1109 | case LTYPE_LOGIN: | |
fa64c868 | 1110 | return (wtmp_perform_login(li)); |
1d7b9b20 | 1111 | case LTYPE_LOGOUT: |
fa64c868 | 1112 | return (wtmp_perform_logout(li)); |
1d7b9b20 | 1113 | default: |
a233586b | 1114 | logit("%s: invalid type field", __func__); |
fa64c868 | 1115 | return (0); |
1d7b9b20 | 1116 | } |
564dd50a | 1117 | } |
1d7b9b20 | 1118 | |
1119 | ||
d1cf9a87 | 1120 | /* |
fa64c868 | 1121 | * Notes on fetching login data from wtmp/wtmpx |
2b87da3b | 1122 | * |
5abcdf8e | 1123 | * Logouts are usually recorded with (amongst other things) a blank |
1124 | * username on a given tty line. However, some systems (HP-UX is one) | |
1125 | * leave all fields set, but change the ut_type field to DEAD_PROCESS. | |
1126 | * | |
1127 | * Since we're only looking for logins here, we know that the username | |
1128 | * must be set correctly. On systems that leave it in, we check for | |
1129 | * ut_type==USER_PROCESS (indicating a login.) | |
1130 | * | |
1131 | * Portability: Some systems may set something other than USER_PROCESS | |
1132 | * to indicate a login process. I don't know of any as I write. Also, | |
1133 | * it's possible that some systems may both leave the username in | |
1134 | * place and not have ut_type. | |
1135 | */ | |
1136 | ||
5abcdf8e | 1137 | /* return true if this wtmp entry indicates a login */ |
1138 | static int | |
1139 | wtmp_islogin(struct logininfo *li, struct utmp *ut) | |
1140 | { | |
2b87da3b | 1141 | if (strncmp(li->username, ut->ut_name, |
fa64c868 | 1142 | MIN_SIZEOF(li->username, ut->ut_name)) == 0) { |
a05a70ab | 1143 | # ifdef HAVE_TYPE_IN_UTMP |
5abcdf8e | 1144 | if (ut->ut_type & USER_PROCESS) |
fa64c868 | 1145 | return (1); |
a05a70ab | 1146 | # else |
fa64c868 | 1147 | return (1); |
a05a70ab | 1148 | # endif |
5abcdf8e | 1149 | } |
fa64c868 | 1150 | return (0); |
5abcdf8e | 1151 | } |
1152 | ||
1d7b9b20 | 1153 | int |
564dd50a | 1154 | wtmp_get_entry(struct logininfo *li) |
1155 | { | |
1d7b9b20 | 1156 | struct stat st; |
1157 | struct utmp ut; | |
fa64c868 | 1158 | int fd, found = 0; |
5abcdf8e | 1159 | |
1160 | /* Clear the time entries in our logininfo */ | |
1161 | li->tv_sec = li->tv_usec = 0; | |
1d7b9b20 | 1162 | |
1163 | if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { | |
d1cf9a87 | 1164 | logit("%s: problem opening %s: %s", __func__, |
1d7b9b20 | 1165 | WTMP_FILE, strerror(errno)); |
fa64c868 | 1166 | return (0); |
1d7b9b20 | 1167 | } |
2b87da3b | 1168 | if (fstat(fd, &st) != 0) { |
d1cf9a87 | 1169 | logit("%s: couldn't stat %s: %s", __func__, |
1d7b9b20 | 1170 | WTMP_FILE, strerror(errno)); |
1171 | close(fd); | |
fa64c868 | 1172 | return (0); |
1d7b9b20 | 1173 | } |
1d7b9b20 | 1174 | |
5abcdf8e | 1175 | /* Seek to the start of the last struct utmp */ |
d9d47a26 | 1176 | if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) { |
5abcdf8e | 1177 | /* Looks like we've got a fresh wtmp file */ |
1178 | close(fd); | |
fa64c868 | 1179 | return (0); |
5abcdf8e | 1180 | } |
1181 | ||
1182 | while (!found) { | |
9f32ceb4 | 1183 | if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) { |
d1cf9a87 | 1184 | logit("%s: read of %s failed: %s", __func__, |
1d7b9b20 | 1185 | WTMP_FILE, strerror(errno)); |
1186 | close (fd); | |
fa64c868 | 1187 | return (0); |
1d7b9b20 | 1188 | } |
5abcdf8e | 1189 | if ( wtmp_islogin(li, &ut) ) { |
1190 | found = 1; | |
fa64c868 | 1191 | /* |
1192 | * We've already checked for a time in struct | |
1193 | * utmp, in login_getlast() | |
1194 | */ | |
a05a70ab | 1195 | # ifdef HAVE_TIME_IN_UTMP |
1d7b9b20 | 1196 | li->tv_sec = ut.ut_time; |
a05a70ab | 1197 | # else |
1d7b9b20 | 1198 | # if HAVE_TV_IN_UTMP |
1199 | li->tv_sec = ut.ut_tv.tv_sec; | |
1200 | # endif | |
a05a70ab | 1201 | # endif |
5abcdf8e | 1202 | line_fullname(li->line, ut.ut_line, |
fa64c868 | 1203 | MIN_SIZEOF(li->line, ut.ut_line)); |
a05a70ab | 1204 | # ifdef HAVE_HOST_IN_UTMP |
5abcdf8e | 1205 | strlcpy(li->hostname, ut.ut_host, |
fa64c868 | 1206 | MIN_SIZEOF(li->hostname, ut.ut_host)); |
a05a70ab | 1207 | # endif |
5abcdf8e | 1208 | continue; |
1d7b9b20 | 1209 | } |
5abcdf8e | 1210 | /* Seek back 2 x struct utmp */ |
d9d47a26 | 1211 | if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) { |
5abcdf8e | 1212 | /* We've found the start of the file, so quit */ |
fa64c868 | 1213 | close(fd); |
1214 | return (0); | |
1d7b9b20 | 1215 | } |
5abcdf8e | 1216 | } |
1217 | ||
1218 | /* We found an entry. Tidy up and return */ | |
1219 | close(fd); | |
fa64c868 | 1220 | return (1); |
564dd50a | 1221 | } |
a05a70ab | 1222 | # endif /* USE_WTMP */ |
1d7b9b20 | 1223 | |
1224 | ||
1225 | /** | |
564dd50a | 1226 | ** Low-level wtmpx functions |
1d7b9b20 | 1227 | **/ |
1228 | ||
1229 | #ifdef USE_WTMPX | |
fa64c868 | 1230 | /* |
1231 | * Write a wtmpx entry direct to the end of the file | |
1232 | * This is a slight modification of code in OpenBSD's logwtmp.c | |
1233 | */ | |
1d7b9b20 | 1234 | static int |
564dd50a | 1235 | wtmpx_write(struct logininfo *li, struct utmpx *utx) |
1236 | { | |
41c64c91 | 1237 | #ifndef HAVE_UPDWTMPX |
1d7b9b20 | 1238 | struct stat buf; |
1239 | int fd, ret = 1; | |
1240 | ||
1241 | if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
d1cf9a87 | 1242 | logit("%s: problem opening %s: %s", __func__, |
1d7b9b20 | 1243 | WTMPX_FILE, strerror(errno)); |
fa64c868 | 1244 | return (0); |
1d7b9b20 | 1245 | } |
1246 | ||
2b87da3b | 1247 | if (fstat(fd, &buf) == 0) |
d72f7b79 | 1248 | if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) { |
1d7b9b20 | 1249 | ftruncate(fd, buf.st_size); |
a233586b | 1250 | logit("%s: problem writing %s: %s", __func__, |
1d7b9b20 | 1251 | WTMPX_FILE, strerror(errno)); |
1252 | ret = 0; | |
1253 | } | |
fa64c868 | 1254 | close(fd); |
1d7b9b20 | 1255 | |
fa64c868 | 1256 | return (ret); |
41c64c91 | 1257 | #else |
1258 | updwtmpx(WTMPX_FILE, utx); | |
fa64c868 | 1259 | return (1); |
41c64c91 | 1260 | #endif |
564dd50a | 1261 | } |
1d7b9b20 | 1262 | |
1263 | ||
1264 | static int | |
564dd50a | 1265 | wtmpx_perform_login(struct logininfo *li) |
1266 | { | |
1d7b9b20 | 1267 | struct utmpx utx; |
1268 | ||
1269 | construct_utmpx(li, &utx); | |
fa64c868 | 1270 | return (wtmpx_write(li, &utx)); |
564dd50a | 1271 | } |
1d7b9b20 | 1272 | |
1273 | ||
1274 | static int | |
564dd50a | 1275 | wtmpx_perform_logout(struct logininfo *li) |
1276 | { | |
1d7b9b20 | 1277 | struct utmpx utx; |
1278 | ||
1279 | construct_utmpx(li, &utx); | |
fa64c868 | 1280 | return (wtmpx_write(li, &utx)); |
564dd50a | 1281 | } |
1d7b9b20 | 1282 | |
1283 | ||
1284 | int | |
564dd50a | 1285 | wtmpx_write_entry(struct logininfo *li) |
1286 | { | |
1d7b9b20 | 1287 | switch(li->type) { |
1288 | case LTYPE_LOGIN: | |
fa64c868 | 1289 | return (wtmpx_perform_login(li)); |
1d7b9b20 | 1290 | case LTYPE_LOGOUT: |
fa64c868 | 1291 | return (wtmpx_perform_logout(li)); |
1d7b9b20 | 1292 | default: |
a233586b | 1293 | logit("%s: invalid type field", __func__); |
fa64c868 | 1294 | return (0); |
1d7b9b20 | 1295 | } |
564dd50a | 1296 | } |
1d7b9b20 | 1297 | |
5abcdf8e | 1298 | /* Please see the notes above wtmp_islogin() for information about the |
1299 | next two functions */ | |
1300 | ||
1301 | /* Return true if this wtmpx entry indicates a login */ | |
1302 | static int | |
1303 | wtmpx_islogin(struct logininfo *li, struct utmpx *utx) | |
1304 | { | |
fa64c868 | 1305 | if (strncmp(li->username, utx->ut_name, |
1306 | MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) { | |
a05a70ab | 1307 | # ifdef HAVE_TYPE_IN_UTMPX |
5abcdf8e | 1308 | if (utx->ut_type == USER_PROCESS) |
fa64c868 | 1309 | return (1); |
a05a70ab | 1310 | # else |
fa64c868 | 1311 | return (1); |
a05a70ab | 1312 | # endif |
5abcdf8e | 1313 | } |
fa64c868 | 1314 | return (0); |
5abcdf8e | 1315 | } |
1316 | ||
1d7b9b20 | 1317 | |
1318 | int | |
564dd50a | 1319 | wtmpx_get_entry(struct logininfo *li) |
1320 | { | |
1d7b9b20 | 1321 | struct stat st; |
1322 | struct utmpx utx; | |
5abcdf8e | 1323 | int fd, found=0; |
1324 | ||
1325 | /* Clear the time entries */ | |
1326 | li->tv_sec = li->tv_usec = 0; | |
1d7b9b20 | 1327 | |
1328 | if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { | |
d1cf9a87 | 1329 | logit("%s: problem opening %s: %s", __func__, |
1d7b9b20 | 1330 | WTMPX_FILE, strerror(errno)); |
fa64c868 | 1331 | return (0); |
1d7b9b20 | 1332 | } |
2b87da3b | 1333 | if (fstat(fd, &st) != 0) { |
d1cf9a87 | 1334 | logit("%s: couldn't stat %s: %s", __func__, |
fdebdd4f | 1335 | WTMPX_FILE, strerror(errno)); |
1d7b9b20 | 1336 | close(fd); |
fa64c868 | 1337 | return (0); |
1d7b9b20 | 1338 | } |
2b87da3b | 1339 | |
5abcdf8e | 1340 | /* Seek to the start of the last struct utmpx */ |
d9d47a26 | 1341 | if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) { |
5abcdf8e | 1342 | /* probably a newly rotated wtmpx file */ |
1343 | close(fd); | |
fa64c868 | 1344 | return (0); |
5abcdf8e | 1345 | } |
1d7b9b20 | 1346 | |
5abcdf8e | 1347 | while (!found) { |
9f32ceb4 | 1348 | if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) { |
d1cf9a87 | 1349 | logit("%s: read of %s failed: %s", __func__, |
1d7b9b20 | 1350 | WTMPX_FILE, strerror(errno)); |
1351 | close (fd); | |
fa64c868 | 1352 | return (0); |
1d7b9b20 | 1353 | } |
fa64c868 | 1354 | /* |
d1cf9a87 | 1355 | * Logouts are recorded as a blank username on a particular |
fa64c868 | 1356 | * line. So, we just need to find the username in struct utmpx |
1357 | */ | |
1358 | if (wtmpx_islogin(li, &utx)) { | |
d80063fe | 1359 | found = 1; |
fa64c868 | 1360 | # if defined(HAVE_TV_IN_UTMPX) |
1d7b9b20 | 1361 | li->tv_sec = utx.ut_tv.tv_sec; |
fa64c868 | 1362 | # elif defined(HAVE_TIME_IN_UTMPX) |
1d7b9b20 | 1363 | li->tv_sec = utx.ut_time; |
a05a70ab | 1364 | # endif |
a4d05724 | 1365 | line_fullname(li->line, utx.ut_line, sizeof(li->line)); |
fa64c868 | 1366 | # if defined(HAVE_HOST_IN_UTMPX) |
5abcdf8e | 1367 | strlcpy(li->hostname, utx.ut_host, |
fa64c868 | 1368 | MIN_SIZEOF(li->hostname, utx.ut_host)); |
a05a70ab | 1369 | # endif |
5abcdf8e | 1370 | continue; |
1d7b9b20 | 1371 | } |
d9d47a26 | 1372 | if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) { |
fa64c868 | 1373 | close(fd); |
1374 | return (0); | |
1d7b9b20 | 1375 | } |
5abcdf8e | 1376 | } |
1377 | ||
1378 | close(fd); | |
fa64c868 | 1379 | return (1); |
564dd50a | 1380 | } |
f988dce5 | 1381 | #endif /* USE_WTMPX */ |
1d7b9b20 | 1382 | |
1d7b9b20 | 1383 | /** |
564dd50a | 1384 | ** Low-level libutil login() functions |
1d7b9b20 | 1385 | **/ |
1386 | ||
1387 | #ifdef USE_LOGIN | |
1d7b9b20 | 1388 | static int |
564dd50a | 1389 | syslogin_perform_login(struct logininfo *li) |
1390 | { | |
1d7b9b20 | 1391 | struct utmp *ut; |
1392 | ||
7a52470e | 1393 | ut = xmalloc(sizeof(*ut)); |
1d7b9b20 | 1394 | construct_utmp(li, ut); |
1395 | login(ut); | |
6cef88bc | 1396 | free(ut); |
1d7b9b20 | 1397 | |
fa64c868 | 1398 | return (1); |
564dd50a | 1399 | } |
1d7b9b20 | 1400 | |
564dd50a | 1401 | static int |
1402 | syslogin_perform_logout(struct logininfo *li) | |
1403 | { | |
a05a70ab | 1404 | # ifdef HAVE_LOGOUT |
f20d4564 | 1405 | char line[UT_LINESIZE]; |
2b87da3b | 1406 | |
1d7b9b20 | 1407 | (void)line_stripname(line, li->line, sizeof(line)); |
1408 | ||
fa64c868 | 1409 | if (!logout(line)) |
a233586b | 1410 | logit("%s: logout() returned an error", __func__); |
a05a70ab | 1411 | # ifdef HAVE_LOGWTMP |
fa64c868 | 1412 | else |
1d7b9b20 | 1413 | logwtmp(line, "", ""); |
a05a70ab | 1414 | # endif |
5abcdf8e | 1415 | /* FIXME: (ATL - if the need arises) What to do if we have |
1416 | * login, but no logout? what if logout but no logwtmp? All | |
1417 | * routines are in libutil so they should all be there, | |
1418 | * but... */ | |
a05a70ab | 1419 | # endif |
fa64c868 | 1420 | return (1); |
564dd50a | 1421 | } |
1d7b9b20 | 1422 | |
1d7b9b20 | 1423 | int |
564dd50a | 1424 | syslogin_write_entry(struct logininfo *li) |
1425 | { | |
1d7b9b20 | 1426 | switch (li->type) { |
1427 | case LTYPE_LOGIN: | |
fa64c868 | 1428 | return (syslogin_perform_login(li)); |
1d7b9b20 | 1429 | case LTYPE_LOGOUT: |
fa64c868 | 1430 | return (syslogin_perform_logout(li)); |
1d7b9b20 | 1431 | default: |
a233586b | 1432 | logit("%s: Invalid type field", __func__); |
fa64c868 | 1433 | return (0); |
1d7b9b20 | 1434 | } |
564dd50a | 1435 | } |
f988dce5 | 1436 | #endif /* USE_LOGIN */ |
1d7b9b20 | 1437 | |
1438 | /* end of file log-syslogin.c */ | |
1439 | ||
1d7b9b20 | 1440 | /** |
564dd50a | 1441 | ** Low-level lastlog functions |
1d7b9b20 | 1442 | **/ |
1443 | ||
1444 | #ifdef USE_LASTLOG | |
a05a70ab | 1445 | #define LL_FILE 1 |
1446 | #define LL_DIR 2 | |
1447 | #define LL_OTHER 3 | |
1d7b9b20 | 1448 | |
1d7b9b20 | 1449 | static void |
564dd50a | 1450 | lastlog_construct(struct logininfo *li, struct lastlog *last) |
1451 | { | |
1d7b9b20 | 1452 | /* clear the structure */ |
dbaa2e87 | 1453 | memset(last, '\0', sizeof(*last)); |
2b87da3b | 1454 | |
fa64c868 | 1455 | line_stripname(last->ll_line, li->line, sizeof(last->ll_line)); |
5abcdf8e | 1456 | strlcpy(last->ll_host, li->hostname, |
1457 | MIN_SIZEOF(last->ll_host, li->hostname)); | |
1d7b9b20 | 1458 | last->ll_time = li->tv_sec; |
564dd50a | 1459 | } |
1d7b9b20 | 1460 | |
1d7b9b20 | 1461 | static int |
564dd50a | 1462 | lastlog_filetype(char *filename) |
1463 | { | |
1d7b9b20 | 1464 | struct stat st; |
1465 | ||
a05a70ab | 1466 | if (stat(LASTLOG_FILE, &st) != 0) { |
a233586b | 1467 | logit("%s: Couldn't stat %s: %s", __func__, |
fa64c868 | 1468 | LASTLOG_FILE, strerror(errno)); |
1469 | return (0); | |
1d7b9b20 | 1470 | } |
1d7b9b20 | 1471 | if (S_ISDIR(st.st_mode)) |
fa64c868 | 1472 | return (LL_DIR); |
1d7b9b20 | 1473 | else if (S_ISREG(st.st_mode)) |
fa64c868 | 1474 | return (LL_FILE); |
1d7b9b20 | 1475 | else |
fa64c868 | 1476 | return (LL_OTHER); |
564dd50a | 1477 | } |
1d7b9b20 | 1478 | |
1479 | ||
1480 | /* open the file (using filemode) and seek to the login entry */ | |
1481 | static int | |
564dd50a | 1482 | lastlog_openseek(struct logininfo *li, int *fd, int filemode) |
1483 | { | |
1d7b9b20 | 1484 | off_t offset; |
1485 | int type; | |
1486 | char lastlog_file[1024]; | |
1487 | ||
1488 | type = lastlog_filetype(LASTLOG_FILE); | |
1489 | switch (type) { | |
fa64c868 | 1490 | case LL_FILE: |
1491 | strlcpy(lastlog_file, LASTLOG_FILE, | |
1492 | sizeof(lastlog_file)); | |
1493 | break; | |
1494 | case LL_DIR: | |
1495 | snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", | |
1496 | LASTLOG_FILE, li->username); | |
1497 | break; | |
1498 | default: | |
a233586b | 1499 | logit("%s: %.100s is not a file or directory!", __func__, |
fa64c868 | 1500 | LASTLOG_FILE); |
1501 | return (0); | |
a05a70ab | 1502 | } |
1d7b9b20 | 1503 | |
ee476051 | 1504 | *fd = open(lastlog_file, filemode, 0600); |
fa64c868 | 1505 | if (*fd < 0) { |
a233586b | 1506 | debug("%s: Couldn't open %s: %s", __func__, |
1d7b9b20 | 1507 | lastlog_file, strerror(errno)); |
fa64c868 | 1508 | return (0); |
1d7b9b20 | 1509 | } |
2b87da3b | 1510 | |
d93a7e5a | 1511 | if (type == LL_FILE) { |
1512 | /* find this uid's offset in the lastlog file */ | |
d9d47a26 | 1513 | offset = (off_t) ((long)li->uid * sizeof(struct lastlog)); |
1d7b9b20 | 1514 | |
fa64c868 | 1515 | if (lseek(*fd, offset, SEEK_SET) != offset) { |
a233586b | 1516 | logit("%s: %s->lseek(): %s", __func__, |
1517 | lastlog_file, strerror(errno)); | |
fa64c868 | 1518 | return (0); |
d93a7e5a | 1519 | } |
1d7b9b20 | 1520 | } |
2b87da3b | 1521 | |
fa64c868 | 1522 | return (1); |
564dd50a | 1523 | } |
1d7b9b20 | 1524 | |
1525 | static int | |
564dd50a | 1526 | lastlog_perform_login(struct logininfo *li) |
1527 | { | |
1d7b9b20 | 1528 | struct lastlog last; |
1529 | int fd; | |
1530 | ||
1531 | /* create our struct lastlog */ | |
1532 | lastlog_construct(li, &last); | |
1533 | ||
ee476051 | 1534 | if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT)) |
fa64c868 | 1535 | return (0); |
2b87da3b | 1536 | |
1d7b9b20 | 1537 | /* write the entry */ |
d72f7b79 | 1538 | if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) { |
1a022229 | 1539 | close(fd); |
a233586b | 1540 | logit("%s: Error writing to %s: %s", __func__, |
1a022229 | 1541 | LASTLOG_FILE, strerror(errno)); |
fa64c868 | 1542 | return (0); |
a05a70ab | 1543 | } |
1a022229 | 1544 | |
1545 | close(fd); | |
fa64c868 | 1546 | return (1); |
564dd50a | 1547 | } |
1d7b9b20 | 1548 | |
1d7b9b20 | 1549 | int |
564dd50a | 1550 | lastlog_write_entry(struct logininfo *li) |
1551 | { | |
1d7b9b20 | 1552 | switch(li->type) { |
1553 | case LTYPE_LOGIN: | |
fa64c868 | 1554 | return (lastlog_perform_login(li)); |
1d7b9b20 | 1555 | default: |
a233586b | 1556 | logit("%s: Invalid type field", __func__); |
fa64c868 | 1557 | return (0); |
1d7b9b20 | 1558 | } |
564dd50a | 1559 | } |
1d7b9b20 | 1560 | |
1d7b9b20 | 1561 | static void |
564dd50a | 1562 | lastlog_populate_entry(struct logininfo *li, struct lastlog *last) |
1563 | { | |
1d7b9b20 | 1564 | line_fullname(li->line, last->ll_line, sizeof(li->line)); |
2b87da3b | 1565 | strlcpy(li->hostname, last->ll_host, |
fa64c868 | 1566 | MIN_SIZEOF(li->hostname, last->ll_host)); |
1d7b9b20 | 1567 | li->tv_sec = last->ll_time; |
564dd50a | 1568 | } |
1d7b9b20 | 1569 | |
1d7b9b20 | 1570 | int |
564dd50a | 1571 | lastlog_get_entry(struct logininfo *li) |
1572 | { | |
1d7b9b20 | 1573 | struct lastlog last; |
ed05a983 | 1574 | int fd, ret; |
1d7b9b20 | 1575 | |
ce49121d | 1576 | if (!lastlog_openseek(li, &fd, O_RDONLY)) |
ed05a983 | 1577 | return (0); |
ce49121d | 1578 | |
ed05a983 | 1579 | ret = atomicio(read, fd, &last, sizeof(last)); |
ce49121d | 1580 | close(fd); |
1581 | ||
ed05a983 | 1582 | switch (ret) { |
1583 | case 0: | |
1584 | memset(&last, '\0', sizeof(last)); | |
1585 | /* FALLTHRU */ | |
1586 | case sizeof(last): | |
1587 | lastlog_populate_entry(li, &last); | |
1588 | return (1); | |
1589 | case -1: | |
aff51935 | 1590 | error("%s: Error reading from %s: %s", __func__, |
ed05a983 | 1591 | LASTLOG_FILE, strerror(errno)); |
1592 | return (0); | |
1593 | default: | |
1594 | error("%s: Error reading from %s: Expecting %d, got %d", | |
dfde7f6e | 1595 | __func__, LASTLOG_FILE, (int)sizeof(last), ret); |
ed05a983 | 1596 | return (0); |
1597 | } | |
ce49121d | 1598 | |
ed05a983 | 1599 | /* NOTREACHED */ |
1600 | return (0); | |
564dd50a | 1601 | } |
f988dce5 | 1602 | #endif /* USE_LASTLOG */ |
b6610e8f | 1603 | |
1604 | #ifdef USE_BTMP | |
1605 | /* | |
1606 | * Logs failed login attempts in _PATH_BTMP if that exists. | |
1607 | * The most common login failure is to give password instead of username. | |
1608 | * So the _PATH_BTMP file checked for the correct permission, so that | |
1609 | * only root can read it. | |
1610 | */ | |
1611 | ||
1612 | void | |
1613 | record_failed_login(const char *username, const char *hostname, | |
1614 | const char *ttyn) | |
1615 | { | |
1616 | int fd; | |
1617 | struct utmp ut; | |
1618 | struct sockaddr_storage from; | |
dfde7f6e | 1619 | socklen_t fromlen = sizeof(from); |
b6610e8f | 1620 | struct sockaddr_in *a4; |
1621 | struct sockaddr_in6 *a6; | |
1622 | time_t t; | |
1623 | struct stat fst; | |
1624 | ||
1625 | if (geteuid() != 0) | |
1626 | return; | |
1627 | if ((fd = open(_PATH_BTMP, O_WRONLY | O_APPEND)) < 0) { | |
1628 | debug("Unable to open the btmp file %s: %s", _PATH_BTMP, | |
1629 | strerror(errno)); | |
1630 | return; | |
1631 | } | |
1632 | if (fstat(fd, &fst) < 0) { | |
1633 | logit("%s: fstat of %s failed: %s", __func__, _PATH_BTMP, | |
1634 | strerror(errno)); | |
1635 | goto out; | |
1636 | } | |
1637 | if((fst.st_mode & (S_IRWXG | S_IRWXO)) || (fst.st_uid != 0)){ | |
1638 | logit("Excess permission or bad ownership on file %s", | |
1639 | _PATH_BTMP); | |
1640 | goto out; | |
1641 | } | |
1642 | ||
1643 | memset(&ut, 0, sizeof(ut)); | |
1644 | /* strncpy because we don't necessarily want nul termination */ | |
1645 | strncpy(ut.ut_user, username, sizeof(ut.ut_user)); | |
1646 | strlcpy(ut.ut_line, "ssh:notty", sizeof(ut.ut_line)); | |
1647 | ||
1648 | time(&t); | |
1649 | ut.ut_time = t; /* ut_time is not always a time_t */ | |
1650 | ut.ut_type = LOGIN_PROCESS; | |
1651 | ut.ut_pid = getpid(); | |
1652 | ||
1653 | /* strncpy because we don't necessarily want nul termination */ | |
1654 | strncpy(ut.ut_host, hostname, sizeof(ut.ut_host)); | |
1655 | ||
1656 | if (packet_connection_is_on_socket() && | |
1657 | getpeername(packet_get_connection_in(), | |
1658 | (struct sockaddr *)&from, &fromlen) == 0) { | |
1659 | ipv64_normalise_mapped(&from, &fromlen); | |
1660 | if (from.ss_family == AF_INET) { | |
1661 | a4 = (struct sockaddr_in *)&from; | |
1662 | memcpy(&ut.ut_addr, &(a4->sin_addr), | |
1663 | MIN_SIZEOF(ut.ut_addr, a4->sin_addr)); | |
1664 | } | |
1665 | #ifdef HAVE_ADDR_V6_IN_UTMP | |
1666 | if (from.ss_family == AF_INET6) { | |
1667 | a6 = (struct sockaddr_in6 *)&from; | |
1668 | memcpy(&ut.ut_addr_v6, &(a6->sin6_addr), | |
1669 | MIN_SIZEOF(ut.ut_addr_v6, a6->sin6_addr)); | |
1670 | } | |
1671 | #endif | |
1672 | } | |
1673 | ||
1674 | if (atomicio(vwrite, fd, &ut, sizeof(ut)) != sizeof(ut)) | |
1675 | error("Failed to write to %s: %s", _PATH_BTMP, | |
1676 | strerror(errno)); | |
1677 | ||
1678 | out: | |
1679 | close(fd); | |
1680 | } | |
1681 | #endif /* USE_BTMP */ |