1 /* 2 * Copyright (c) 2000 Andre Lucas. All rights reserved. 3 * Portions copyright (c) 1998 Todd C. Miller 4 * Portions copyright (c) 1996 Jason Downs 5 * Portions copyright (c) 1996 Theo de Raadt 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. 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 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 49 /** 50 ** loginrec.c: platform-independent login recording and lastlog retrieval 51 **/ 52 53 /* 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 */ 147 148 #include "includes.h" 149 __RCSID("$FreeBSD$"); 150 151 #include <sys/types.h> 152 #include <sys/stat.h> 153 #include <sys/socket.h> 154 155 #include <netinet/in.h> 156 157 #include <errno.h> 158 #include <fcntl.h> 159 #ifdef HAVE_PATHS_H 160 # include <paths.h> 161 #endif 162 #include <pwd.h> 163 #include <stdarg.h> 164 #include <string.h> 165 #include <time.h> 166 #include <unistd.h> 167 168 #include "xmalloc.h" 169 #include "key.h" 170 #include "hostfile.h" 171 #include "ssh.h" 172 #include "loginrec.h" 173 #include "log.h" 174 #include "atomicio.h" 175 #include "packet.h" 176 #include "canohost.h" 177 #include "auth.h" 178 #include "buffer.h" 179 180 #ifdef HAVE_UTIL_H 181 # include <util.h> 182 #endif 183 184 #ifdef HAVE_LIBUTIL_H 185 # include <libutil.h> 186 #endif 187 188 /** 189 ** prototypes for helper functions in this file 190 **/ 191 192 #if HAVE_UTMP_H 193 void set_utmp_time(struct logininfo *li, struct utmp *ut); 194 void construct_utmp(struct logininfo *li, struct utmp *ut); 195 #endif 196 197 #ifdef HAVE_UTMPX_H 198 void set_utmpx_time(struct logininfo *li, struct utmpx *ut); 199 void construct_utmpx(struct logininfo *li, struct utmpx *ut); 200 #endif 201 202 int utmp_write_entry(struct logininfo *li); 203 int utmpx_write_entry(struct logininfo *li); 204 int wtmp_write_entry(struct logininfo *li); 205 int wtmpx_write_entry(struct logininfo *li); 206 int lastlog_write_entry(struct logininfo *li); 207 int syslogin_write_entry(struct logininfo *li); 208 209 int getlast_entry(struct logininfo *li); 210 int lastlog_get_entry(struct logininfo *li); 211 int utmpx_get_entry(struct logininfo *li); 212 int wtmp_get_entry(struct logininfo *li); 213 int wtmpx_get_entry(struct logininfo *li); 214 215 extern Buffer loginmsg; 216 217 /* pick the shortest string */ 218 #define MIN_SIZEOF(s1,s2) (sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2)) 219 220 /** 221 ** platform-independent login functions 222 **/ 223 224 /* 225 * login_login(struct logininfo *) - Record a login 226 * 227 * Call with a pointer to a struct logininfo initialised with 228 * login_init_entry() or login_alloc_entry() 229 * 230 * Returns: 231 * >0 if successful 232 * 0 on failure (will use OpenSSH's logging facilities for diagnostics) 233 */ 234 int 235 login_login(struct logininfo *li) 236 { 237 li->type = LTYPE_LOGIN; 238 return (login_write(li)); 239 } 240 241 242 /* 243 * login_logout(struct logininfo *) - Record a logout 244 * 245 * Call as with login_login() 246 * 247 * Returns: 248 * >0 if successful 249 * 0 on failure (will use OpenSSH's logging facilities for diagnostics) 250 */ 251 int 252 login_logout(struct logininfo *li) 253 { 254 li->type = LTYPE_LOGOUT; 255 return (login_write(li)); 256 } 257 258 /* 259 * login_get_lastlog_time(int) - Retrieve the last login time 260 * 261 * Retrieve the last login time for the given uid. Will try to use the 262 * system lastlog facilities if they are available, but will fall back 263 * to looking in wtmp/wtmpx if necessary 264 * 265 * Returns: 266 * 0 on failure, or if user has never logged in 267 * Time in seconds from the epoch if successful 268 * 269 * Useful preprocessor symbols: 270 * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog 271 * info 272 * USE_LASTLOG: If set, indicates the presence of system lastlog 273 * facilities. If this and DISABLE_LASTLOG are not set, 274 * try to retrieve lastlog information from wtmp/wtmpx. 275 */ 276 unsigned int 277 login_get_lastlog_time(const int uid) 278 { 279 struct logininfo li; 280 281 if (login_get_lastlog(&li, uid)) 282 return (li.tv_sec); 283 else 284 return (0); 285 } 286 287 /* 288 * login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry 289 * 290 * Retrieve a logininfo structure populated (only partially) with 291 * information from the system lastlog data, or from wtmp/wtmpx if no 292 * system lastlog information exists. 293 * 294 * Note this routine must be given a pre-allocated logininfo. 295 * 296 * Returns: 297 * >0: A pointer to your struct logininfo if successful 298 * 0 on failure (will use OpenSSH's logging facilities for diagnostics) 299 */ 300 struct logininfo * 301 login_get_lastlog(struct logininfo *li, const int uid) 302 { 303 struct passwd *pw; 304 305 memset(li, '\0', sizeof(*li)); 306 li->uid = uid; 307 308 /* 309 * If we don't have a 'real' lastlog, we need the username to 310 * reliably search wtmp(x) for the last login (see 311 * wtmp_get_entry().) 312 */ 313 pw = getpwuid(uid); 314 if (pw == NULL) 315 fatal("%s: Cannot find account for uid %i", __func__, uid); 316 317 /* No MIN_SIZEOF here - we absolutely *must not* truncate the 318 * username (XXX - so check for trunc!) */ 319 strlcpy(li->username, pw->pw_name, sizeof(li->username)); 320 321 if (getlast_entry(li)) 322 return (li); 323 else 324 return (NULL); 325 } 326 327 328 /* 329 * login_alloc_entry(int, char*, char*, char*) - Allocate and initialise 330 * a logininfo structure 331 * 332 * This function creates a new struct logininfo, a data structure 333 * meant to carry the information required to portably record login info. 334 * 335 * Returns a pointer to a newly created struct logininfo. If memory 336 * allocation fails, the program halts. 337 */ 338 struct 339 logininfo *login_alloc_entry(int pid, const char *username, 340 const char *hostname, const char *line) 341 { 342 struct logininfo *newli; 343 344 newli = xmalloc(sizeof(*newli)); 345 login_init_entry(newli, pid, username, hostname, line); 346 return (newli); 347 } 348 349 350 /* login_free_entry(struct logininfo *) - free struct memory */ 351 void 352 login_free_entry(struct logininfo *li) 353 { 354 xfree(li); 355 } 356 357 358 /* login_init_entry(struct logininfo *, int, char*, char*, char*) 359 * - initialise a struct logininfo 360 * 361 * Populates a new struct logininfo, a data structure meant to carry 362 * the information required to portably record login info. 363 * 364 * Returns: 1 365 */ 366 int 367 login_init_entry(struct logininfo *li, int pid, const char *username, 368 const char *hostname, const char *line) 369 { 370 struct passwd *pw; 371 372 memset(li, 0, sizeof(*li)); 373 374 li->pid = pid; 375 376 /* set the line information */ 377 if (line) 378 line_fullname(li->line, line, sizeof(li->line)); 379 380 if (username) { 381 strlcpy(li->username, username, sizeof(li->username)); 382 pw = getpwnam(li->username); 383 if (pw == NULL) { 384 fatal("%s: Cannot find user \"%s\"", __func__, 385 li->username); 386 } 387 li->uid = pw->pw_uid; 388 } 389 390 if (hostname) 391 strlcpy(li->hostname, hostname, sizeof(li->hostname)); 392 393 return (1); 394 } 395 396 /* 397 * login_set_current_time(struct logininfo *) - set the current time 398 * 399 * Set the current time in a logininfo structure. This function is 400 * meant to eliminate the need to deal with system dependencies for 401 * time handling. 402 */ 403 void 404 login_set_current_time(struct logininfo *li) 405 { 406 struct timeval tv; 407 408 gettimeofday(&tv, NULL); 409 410 li->tv_sec = tv.tv_sec; 411 li->tv_usec = tv.tv_usec; 412 } 413 414 /* copy a sockaddr_* into our logininfo */ 415 void 416 login_set_addr(struct logininfo *li, const struct sockaddr *sa, 417 const unsigned int sa_size) 418 { 419 unsigned int bufsize = sa_size; 420 421 /* make sure we don't overrun our union */ 422 if (sizeof(li->hostaddr) < sa_size) 423 bufsize = sizeof(li->hostaddr); 424 425 memcpy(&li->hostaddr.sa, sa, bufsize); 426 } 427 428 429 /** 430 ** login_write: Call low-level recording functions based on autoconf 431 ** results 432 **/ 433 int 434 login_write(struct logininfo *li) 435 { 436 #ifndef HAVE_CYGWIN 437 if (geteuid() != 0) { 438 logit("Attempt to write login records by non-root user (aborting)"); 439 return (1); 440 } 441 #endif 442 443 /* set the timestamp */ 444 login_set_current_time(li); 445 #ifdef USE_LOGIN 446 syslogin_write_entry(li); 447 #endif 448 #ifdef USE_LASTLOG 449 if (li->type == LTYPE_LOGIN) 450 lastlog_write_entry(li); 451 #endif 452 #ifdef USE_UTMP 453 utmp_write_entry(li); 454 #endif 455 #ifdef USE_WTMP 456 wtmp_write_entry(li); 457 #endif 458 #ifdef USE_UTMPX 459 utmpx_write_entry(li); 460 #endif 461 #ifdef USE_WTMPX 462 wtmpx_write_entry(li); 463 #endif 464 #ifdef CUSTOM_SYS_AUTH_RECORD_LOGIN 465 if (li->type == LTYPE_LOGIN && 466 !sys_auth_record_login(li->username,li->hostname,li->line, 467 &loginmsg)) 468 logit("Writing login record failed for %s", li->username); 469 #endif 470 #ifdef SSH_AUDIT_EVENTS 471 if (li->type == LTYPE_LOGIN) 472 audit_session_open(li->line); 473 else if (li->type == LTYPE_LOGOUT) 474 audit_session_close(li->line); 475 #endif 476 return (0); 477 } 478 479 #ifdef LOGIN_NEEDS_UTMPX 480 int 481 login_utmp_only(struct logininfo *li) 482 { 483 li->type = LTYPE_LOGIN; 484 login_set_current_time(li); 485 # ifdef USE_UTMP 486 utmp_write_entry(li); 487 # endif 488 # ifdef USE_WTMP 489 wtmp_write_entry(li); 490 # endif 491 # ifdef USE_UTMPX 492 utmpx_write_entry(li); 493 # endif 494 # ifdef USE_WTMPX 495 wtmpx_write_entry(li); 496 # endif 497 return (0); 498 } 499 #endif 500 501 /** 502 ** getlast_entry: Call low-level functions to retrieve the last login 503 ** time. 504 **/ 505 506 /* take the uid in li and return the last login time */ 507 int 508 getlast_entry(struct logininfo *li) 509 { 510 #ifdef USE_LASTLOG 511 return(lastlog_get_entry(li)); 512 #else /* !USE_LASTLOG */ 513 #if defined(USE_UTMPX) && defined(HAVE_SETUTXDB) && \ 514 defined(UTXDB_LASTLOGIN) && defined(HAVE_GETUTXUSER) 515 return (utmpx_get_entry(li)); 516 #endif 517 518 #if 1 519 return (utmpx_get_entry(li)); 520 #endif 521 522 #if defined(DISABLE_LASTLOG) 523 /* On some systems we shouldn't even try to obtain last login 524 * time, e.g. AIX */ 525 return (0); 526 # elif defined(USE_WTMP) && \ 527 (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) 528 /* retrieve last login time from utmp */ 529 return (wtmp_get_entry(li)); 530 # elif defined(USE_WTMPX) && \ 531 (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX)) 532 /* If wtmp isn't available, try wtmpx */ 533 return (wtmpx_get_entry(li)); 534 # else 535 /* Give up: No means of retrieving last login time */ 536 return (0); 537 # endif /* DISABLE_LASTLOG */ 538 #endif /* USE_LASTLOG */ 539 } 540 541 542 543 /* 544 * 'line' string utility functions 545 * 546 * These functions process the 'line' string into one of three forms: 547 * 548 * 1. The full filename (including '/dev') 549 * 2. The stripped name (excluding '/dev') 550 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00 551 * /dev/pts/1 -> ts/1 ) 552 * 553 * Form 3 is used on some systems to identify a .tmp.? entry when 554 * attempting to remove it. Typically both addition and removal is 555 * performed by one application - say, sshd - so as long as the choice 556 * uniquely identifies a terminal it's ok. 557 */ 558 559 560 /* 561 * line_fullname(): add the leading '/dev/' if it doesn't exist make 562 * sure dst has enough space, if not just copy src (ugh) 563 */ 564 char * 565 line_fullname(char *dst, const char *src, u_int dstsize) 566 { 567 memset(dst, '\0', dstsize); 568 if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) 569 strlcpy(dst, src, dstsize); 570 else { 571 strlcpy(dst, "/dev/", dstsize); 572 strlcat(dst, src, dstsize); 573 } 574 return (dst); 575 } 576 577 /* line_stripname(): strip the leading '/dev' if it exists, return dst */ 578 char * 579 line_stripname(char *dst, const char *src, int dstsize) 580 { 581 memset(dst, '\0', dstsize); 582 if (strncmp(src, "/dev/", 5) == 0) 583 strlcpy(dst, src + 5, dstsize); 584 else 585 strlcpy(dst, src, dstsize); 586 return (dst); 587 } 588 589 /* 590 * line_abbrevname(): Return the abbreviated (usually four-character) 591 * form of the line (Just use the last <dstsize> characters of the 592 * full name.) 593 * 594 * NOTE: use strncpy because we do NOT necessarily want zero 595 * termination 596 */ 597 char * 598 line_abbrevname(char *dst, const char *src, int dstsize) 599 { 600 size_t len; 601 602 memset(dst, '\0', dstsize); 603 604 /* Always skip prefix if present */ 605 if (strncmp(src, "/dev/", 5) == 0) 606 src += 5; 607 608 #ifdef WITH_ABBREV_NO_TTY 609 if (strncmp(src, "tty", 3) == 0) 610 src += 3; 611 #endif 612 613 len = strlen(src); 614 615 if (len > 0) { 616 if (((int)len - dstsize) > 0) 617 src += ((int)len - dstsize); 618 619 /* note: _don't_ change this to strlcpy */ 620 strncpy(dst, src, (size_t)dstsize); 621 } 622 623 return (dst); 624 } 625 626 /** 627 ** utmp utility functions 628 ** 629 ** These functions manipulate struct utmp, taking system differences 630 ** into account. 631 **/ 632 633 #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) 634 635 /* build the utmp structure */ 636 void 637 set_utmp_time(struct logininfo *li, struct utmp *ut) 638 { 639 # if defined(HAVE_TV_IN_UTMP) 640 ut->ut_tv.tv_sec = li->tv_sec; 641 ut->ut_tv.tv_usec = li->tv_usec; 642 # elif defined(HAVE_TIME_IN_UTMP) 643 ut->ut_time = li->tv_sec; 644 # endif 645 } 646 647 void 648 construct_utmp(struct logininfo *li, 649 struct utmp *ut) 650 { 651 # ifdef HAVE_ADDR_V6_IN_UTMP 652 struct sockaddr_in6 *sa6; 653 # endif 654 655 memset(ut, '\0', sizeof(*ut)); 656 657 /* First fill out fields used for both logins and logouts */ 658 659 # ifdef HAVE_ID_IN_UTMP 660 line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); 661 # endif 662 663 # ifdef HAVE_TYPE_IN_UTMP 664 /* This is done here to keep utmp constants out of struct logininfo */ 665 switch (li->type) { 666 case LTYPE_LOGIN: 667 ut->ut_type = USER_PROCESS; 668 #ifdef _UNICOS 669 cray_set_tmpdir(ut); 670 #endif 671 break; 672 case LTYPE_LOGOUT: 673 ut->ut_type = DEAD_PROCESS; 674 #ifdef _UNICOS 675 cray_retain_utmp(ut, li->pid); 676 #endif 677 break; 678 } 679 # endif 680 set_utmp_time(li, ut); 681 682 line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); 683 684 # ifdef HAVE_PID_IN_UTMP 685 ut->ut_pid = li->pid; 686 # endif 687 688 /* If we're logging out, leave all other fields blank */ 689 if (li->type == LTYPE_LOGOUT) 690 return; 691 692 /* 693 * These fields are only used when logging in, and are blank 694 * for logouts. 695 */ 696 697 /* Use strncpy because we don't necessarily want null termination */ 698 strncpy(ut->ut_name, li->username, 699 MIN_SIZEOF(ut->ut_name, li->username)); 700 # ifdef HAVE_HOST_IN_UTMP 701 strncpy(ut->ut_host, li->hostname, 702 MIN_SIZEOF(ut->ut_host, li->hostname)); 703 # endif 704 # ifdef HAVE_ADDR_IN_UTMP 705 /* this is just a 32-bit IP address */ 706 if (li->hostaddr.sa.sa_family == AF_INET) 707 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; 708 # endif 709 # ifdef HAVE_ADDR_V6_IN_UTMP 710 /* this is just a 128-bit IPv6 address */ 711 if (li->hostaddr.sa.sa_family == AF_INET6) { 712 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); 713 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); 714 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { 715 ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; 716 ut->ut_addr_v6[1] = 0; 717 ut->ut_addr_v6[2] = 0; 718 ut->ut_addr_v6[3] = 0; 719 } 720 } 721 # endif 722 } 723 #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */ 724 725 /** 726 ** utmpx utility functions 727 ** 728 ** These functions manipulate struct utmpx, accounting for system 729 ** variations. 730 **/ 731 732 #if defined(USE_UTMPX) || defined (USE_WTMPX) 733 /* build the utmpx structure */ 734 void 735 set_utmpx_time(struct logininfo *li, struct utmpx *utx) 736 { 737 # if defined(HAVE_TV_IN_UTMPX) 738 utx->ut_tv.tv_sec = li->tv_sec; 739 utx->ut_tv.tv_usec = li->tv_usec; 740 # elif defined(HAVE_TIME_IN_UTMPX) 741 utx->ut_time = li->tv_sec; 742 # endif 743 } 744 745 void 746 construct_utmpx(struct logininfo *li, struct utmpx *utx) 747 { 748 # ifdef HAVE_ADDR_V6_IN_UTMP 749 struct sockaddr_in6 *sa6; 750 # endif 751 memset(utx, '\0', sizeof(*utx)); 752 753 # ifdef HAVE_ID_IN_UTMPX 754 line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); 755 # endif 756 757 /* this is done here to keep utmp constants out of loginrec.h */ 758 switch (li->type) { 759 case LTYPE_LOGIN: 760 utx->ut_type = USER_PROCESS; 761 break; 762 case LTYPE_LOGOUT: 763 utx->ut_type = DEAD_PROCESS; 764 break; 765 } 766 line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); 767 set_utmpx_time(li, utx); 768 utx->ut_pid = li->pid; 769 770 /* strncpy(): Don't necessarily want null termination */ 771 strncpy(utx->ut_user, li->username, 772 MIN_SIZEOF(utx->ut_user, li->username)); 773 774 if (li->type == LTYPE_LOGOUT) 775 return; 776 777 /* 778 * These fields are only used when logging in, and are blank 779 * for logouts. 780 */ 781 782 # ifdef HAVE_HOST_IN_UTMPX 783 strncpy(utx->ut_host, li->hostname, 784 MIN_SIZEOF(utx->ut_host, li->hostname)); 785 # endif 786 # ifdef HAVE_ADDR_IN_UTMPX 787 /* this is just a 32-bit IP address */ 788 if (li->hostaddr.sa.sa_family == AF_INET) 789 utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; 790 # endif 791 # ifdef HAVE_ADDR_V6_IN_UTMP 792 /* this is just a 128-bit IPv6 address */ 793 if (li->hostaddr.sa.sa_family == AF_INET6) { 794 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); 795 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); 796 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { 797 ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; 798 ut->ut_addr_v6[1] = 0; 799 ut->ut_addr_v6[2] = 0; 800 ut->ut_addr_v6[3] = 0; 801 } 802 } 803 # endif 804 # ifdef HAVE_SYSLEN_IN_UTMPX 805 /* ut_syslen is the length of the utx_host string */ 806 utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host)); 807 # endif 808 } 809 #endif /* USE_UTMPX || USE_WTMPX */ 810 811 /** 812 ** Low-level utmp functions 813 **/ 814 815 /* FIXME: (ATL) utmp_write_direct needs testing */ 816 #ifdef USE_UTMP 817 818 /* if we can, use pututline() etc. */ 819 # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ 820 defined(HAVE_PUTUTLINE) 821 # define UTMP_USE_LIBRARY 822 # endif 823 824 825 /* write a utmp entry with the system's help (pututline() and pals) */ 826 # ifdef UTMP_USE_LIBRARY 827 static int 828 utmp_write_library(struct logininfo *li, struct utmp *ut) 829 { 830 setutent(); 831 pututline(ut); 832 # ifdef HAVE_ENDUTENT 833 endutent(); 834 # endif 835 return (1); 836 } 837 # else /* UTMP_USE_LIBRARY */ 838 839 /* 840 * Write a utmp entry direct to the file 841 * This is a slightly modification of code in OpenBSD's login.c 842 */ 843 static int 844 utmp_write_direct(struct logininfo *li, struct utmp *ut) 845 { 846 struct utmp old_ut; 847 register int fd; 848 int tty; 849 850 /* FIXME: (ATL) ttyslot() needs local implementation */ 851 852 #if defined(HAVE_GETTTYENT) 853 struct ttyent *ty; 854 855 tty=0; 856 setttyent(); 857 while (NULL != (ty = getttyent())) { 858 tty++; 859 if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line))) 860 break; 861 } 862 endttyent(); 863 864 if (NULL == ty) { 865 logit("%s: tty not found", __func__); 866 return (0); 867 } 868 #else /* FIXME */ 869 870 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ 871 872 #endif /* HAVE_GETTTYENT */ 873 874 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { 875 off_t pos, ret; 876 877 pos = (off_t)tty * sizeof(struct utmp); 878 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { 879 logit("%s: lseek: %s", __func__, strerror(errno)); 880 return (0); 881 } 882 if (ret != pos) { 883 logit("%s: Couldn't seek to tty %d slot in %s", 884 __func__, tty, UTMP_FILE); 885 return (0); 886 } 887 /* 888 * Prevent luser from zero'ing out ut_host. 889 * If the new ut_line is empty but the old one is not 890 * and ut_line and ut_name match, preserve the old ut_line. 891 */ 892 if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) && 893 (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') && 894 (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) && 895 (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) 896 memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); 897 898 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { 899 logit("%s: lseek: %s", __func__, strerror(errno)); 900 return (0); 901 } 902 if (ret != pos) { 903 logit("%s: Couldn't seek to tty %d slot in %s", 904 __func__, tty, UTMP_FILE); 905 return (0); 906 } 907 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { 908 logit("%s: error writing %s: %s", __func__, 909 UTMP_FILE, strerror(errno)); 910 } 911 912 close(fd); 913 return (1); 914 } else { 915 return (0); 916 } 917 } 918 # endif /* UTMP_USE_LIBRARY */ 919 920 static int 921 utmp_perform_login(struct logininfo *li) 922 { 923 struct utmp ut; 924 925 construct_utmp(li, &ut); 926 # ifdef UTMP_USE_LIBRARY 927 if (!utmp_write_library(li, &ut)) { 928 logit("%s: utmp_write_library() failed", __func__); 929 return (0); 930 } 931 # else 932 if (!utmp_write_direct(li, &ut)) { 933 logit("%s: utmp_write_direct() failed", __func__); 934 return (0); 935 } 936 # endif 937 return (1); 938 } 939 940 941 static int 942 utmp_perform_logout(struct logininfo *li) 943 { 944 struct utmp ut; 945 946 construct_utmp(li, &ut); 947 # ifdef UTMP_USE_LIBRARY 948 if (!utmp_write_library(li, &ut)) { 949 logit("%s: utmp_write_library() failed", __func__); 950 return (0); 951 } 952 # else 953 if (!utmp_write_direct(li, &ut)) { 954 logit("%s: utmp_write_direct() failed", __func__); 955 return (0); 956 } 957 # endif 958 return (1); 959 } 960 961 962 int 963 utmp_write_entry(struct logininfo *li) 964 { 965 switch(li->type) { 966 case LTYPE_LOGIN: 967 return (utmp_perform_login(li)); 968 969 case LTYPE_LOGOUT: 970 return (utmp_perform_logout(li)); 971 972 default: 973 logit("%s: invalid type field", __func__); 974 return (0); 975 } 976 } 977 #endif /* USE_UTMP */ 978 979 980 /** 981 ** Low-level utmpx functions 982 **/ 983 984 /* not much point if we don't want utmpx entries */ 985 #ifdef USE_UTMPX 986 987 /* if we have the wherewithall, use pututxline etc. */ 988 # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \ 989 defined(HAVE_PUTUTXLINE) 990 # define UTMPX_USE_LIBRARY 991 # endif 992 993 994 /* write a utmpx entry with the system's help (pututxline() and pals) */ 995 # ifdef UTMPX_USE_LIBRARY 996 static int 997 utmpx_write_library(struct logininfo *li, struct utmpx *utx) 998 { 999 setutxent(); 1000 pututxline(utx); 1001 1002 # ifdef HAVE_ENDUTXENT 1003 endutxent(); 1004 # endif 1005 return (1); 1006 } 1007 1008 # else /* UTMPX_USE_LIBRARY */ 1009 1010 /* write a utmp entry direct to the file */ 1011 static int 1012 utmpx_write_direct(struct logininfo *li, struct utmpx *utx) 1013 { 1014 logit("%s: not implemented!", __func__); 1015 return (0); 1016 } 1017 # endif /* UTMPX_USE_LIBRARY */ 1018 1019 static int 1020 utmpx_perform_login(struct logininfo *li) 1021 { 1022 struct utmpx utx; 1023 1024 construct_utmpx(li, &utx); 1025 # ifdef UTMPX_USE_LIBRARY 1026 if (!utmpx_write_library(li, &utx)) { 1027 logit("%s: utmp_write_library() failed", __func__); 1028 return (0); 1029 } 1030 # else 1031 if (!utmpx_write_direct(li, &ut)) { 1032 logit("%s: utmp_write_direct() failed", __func__); 1033 return (0); 1034 } 1035 # endif 1036 return (1); 1037 } 1038 1039 1040 static int 1041 utmpx_perform_logout(struct logininfo *li) 1042 { 1043 struct utmpx utx; 1044 1045 construct_utmpx(li, &utx); 1046 # ifdef HAVE_ID_IN_UTMPX 1047 line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); 1048 # endif 1049 # ifdef HAVE_TYPE_IN_UTMPX 1050 utx.ut_type = DEAD_PROCESS; 1051 # endif 1052 1053 # ifdef UTMPX_USE_LIBRARY 1054 utmpx_write_library(li, &utx); 1055 # else 1056 utmpx_write_direct(li, &utx); 1057 # endif 1058 return (1); 1059 } 1060 1061 int 1062 utmpx_write_entry(struct logininfo *li) 1063 { 1064 switch(li->type) { 1065 case LTYPE_LOGIN: 1066 return (utmpx_perform_login(li)); 1067 case LTYPE_LOGOUT: 1068 return (utmpx_perform_logout(li)); 1069 default: 1070 logit("%s: invalid type field", __func__); 1071 return (0); 1072 } 1073 } 1074 #endif /* USE_UTMPX */ 1075 1076 1077 /** 1078 ** Low-level wtmp functions 1079 **/ 1080 1081 #ifdef USE_WTMP 1082 1083 /* 1084 * Write a wtmp entry direct to the end of the file 1085 * This is a slight modification of code in OpenBSD's logwtmp.c 1086 */ 1087 static int 1088 wtmp_write(struct logininfo *li, struct utmp *ut) 1089 { 1090 struct stat buf; 1091 int fd, ret = 1; 1092 1093 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) { 1094 logit("%s: problem writing %s: %s", __func__, 1095 WTMP_FILE, strerror(errno)); 1096 return (0); 1097 } 1098 if (fstat(fd, &buf) == 0) 1099 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { 1100 ftruncate(fd, buf.st_size); 1101 logit("%s: problem writing %s: %s", __func__, 1102 WTMP_FILE, strerror(errno)); 1103 ret = 0; 1104 } 1105 close(fd); 1106 return (ret); 1107 } 1108 1109 static int 1110 wtmp_perform_login(struct logininfo *li) 1111 { 1112 struct utmp ut; 1113 1114 construct_utmp(li, &ut); 1115 return (wtmp_write(li, &ut)); 1116 } 1117 1118 1119 static int 1120 wtmp_perform_logout(struct logininfo *li) 1121 { 1122 struct utmp ut; 1123 1124 construct_utmp(li, &ut); 1125 return (wtmp_write(li, &ut)); 1126 } 1127 1128 1129 int 1130 wtmp_write_entry(struct logininfo *li) 1131 { 1132 switch(li->type) { 1133 case LTYPE_LOGIN: 1134 return (wtmp_perform_login(li)); 1135 case LTYPE_LOGOUT: 1136 return (wtmp_perform_logout(li)); 1137 default: 1138 logit("%s: invalid type field", __func__); 1139 return (0); 1140 } 1141 } 1142 1143 1144 /* 1145 * Notes on fetching login data from wtmp/wtmpx 1146 * 1147 * Logouts are usually recorded with (amongst other things) a blank 1148 * username on a given tty line. However, some systems (HP-UX is one) 1149 * leave all fields set, but change the ut_type field to DEAD_PROCESS. 1150 * 1151 * Since we're only looking for logins here, we know that the username 1152 * must be set correctly. On systems that leave it in, we check for 1153 * ut_type==USER_PROCESS (indicating a login.) 1154 * 1155 * Portability: Some systems may set something other than USER_PROCESS 1156 * to indicate a login process. I don't know of any as I write. Also, 1157 * it's possible that some systems may both leave the username in 1158 * place and not have ut_type. 1159 */ 1160 1161 /* return true if this wtmp entry indicates a login */ 1162 static int 1163 wtmp_islogin(struct logininfo *li, struct utmp *ut) 1164 { 1165 if (strncmp(li->username, ut->ut_name, 1166 MIN_SIZEOF(li->username, ut->ut_name)) == 0) { 1167 # ifdef HAVE_TYPE_IN_UTMP 1168 if (ut->ut_type & USER_PROCESS) 1169 return (1); 1170 # else 1171 return (1); 1172 # endif 1173 } 1174 return (0); 1175 } 1176 1177 int 1178 wtmp_get_entry(struct logininfo *li) 1179 { 1180 struct stat st; 1181 struct utmp ut; 1182 int fd, found = 0; 1183 1184 /* Clear the time entries in our logininfo */ 1185 li->tv_sec = li->tv_usec = 0; 1186 1187 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { 1188 logit("%s: problem opening %s: %s", __func__, 1189 WTMP_FILE, strerror(errno)); 1190 return (0); 1191 } 1192 if (fstat(fd, &st) != 0) { 1193 logit("%s: couldn't stat %s: %s", __func__, 1194 WTMP_FILE, strerror(errno)); 1195 close(fd); 1196 return (0); 1197 } 1198 1199 /* Seek to the start of the last struct utmp */ 1200 if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) { 1201 /* Looks like we've got a fresh wtmp file */ 1202 close(fd); 1203 return (0); 1204 } 1205 1206 while (!found) { 1207 if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) { 1208 logit("%s: read of %s failed: %s", __func__, 1209 WTMP_FILE, strerror(errno)); 1210 close (fd); 1211 return (0); 1212 } 1213 if ( wtmp_islogin(li, &ut) ) { 1214 found = 1; 1215 /* 1216 * We've already checked for a time in struct 1217 * utmp, in login_getlast() 1218 */ 1219 # ifdef HAVE_TIME_IN_UTMP 1220 li->tv_sec = ut.ut_time; 1221 # else 1222 # if HAVE_TV_IN_UTMP 1223 li->tv_sec = ut.ut_tv.tv_sec; 1224 # endif 1225 # endif 1226 line_fullname(li->line, ut.ut_line, 1227 MIN_SIZEOF(li->line, ut.ut_line)); 1228 # ifdef HAVE_HOST_IN_UTMP 1229 strlcpy(li->hostname, ut.ut_host, 1230 MIN_SIZEOF(li->hostname, ut.ut_host)); 1231 # endif 1232 continue; 1233 } 1234 /* Seek back 2 x struct utmp */ 1235 if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) { 1236 /* We've found the start of the file, so quit */ 1237 close(fd); 1238 return (0); 1239 } 1240 } 1241 1242 /* We found an entry. Tidy up and return */ 1243 close(fd); 1244 return (1); 1245 } 1246 # endif /* USE_WTMP */ 1247 1248 1249 /** 1250 ** Low-level wtmpx functions 1251 **/ 1252 1253 #ifdef USE_WTMPX 1254 /* 1255 * Write a wtmpx entry direct to the end of the file 1256 * This is a slight modification of code in OpenBSD's logwtmp.c 1257 */ 1258 static int 1259 wtmpx_write(struct logininfo *li, struct utmpx *utx) 1260 { 1261 #ifndef HAVE_UPDWTMPX 1262 struct stat buf; 1263 int fd, ret = 1; 1264 1265 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { 1266 logit("%s: problem opening %s: %s", __func__, 1267 WTMPX_FILE, strerror(errno)); 1268 return (0); 1269 } 1270 1271 if (fstat(fd, &buf) == 0) 1272 if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) { 1273 ftruncate(fd, buf.st_size); 1274 logit("%s: problem writing %s: %s", __func__, 1275 WTMPX_FILE, strerror(errno)); 1276 ret = 0; 1277 } 1278 close(fd); 1279 1280 return (ret); 1281 #else 1282 updwtmpx(WTMPX_FILE, utx); 1283 return (1); 1284 #endif 1285 } 1286 1287 1288 static int 1289 wtmpx_perform_login(struct logininfo *li) 1290 { 1291 struct utmpx utx; 1292 1293 construct_utmpx(li, &utx); 1294 return (wtmpx_write(li, &utx)); 1295 } 1296 1297 1298 static int 1299 wtmpx_perform_logout(struct logininfo *li) 1300 { 1301 struct utmpx utx; 1302 1303 construct_utmpx(li, &utx); 1304 return (wtmpx_write(li, &utx)); 1305 } 1306 1307 1308 int 1309 wtmpx_write_entry(struct logininfo *li) 1310 { 1311 switch(li->type) { 1312 case LTYPE_LOGIN: 1313 return (wtmpx_perform_login(li)); 1314 case LTYPE_LOGOUT: 1315 return (wtmpx_perform_logout(li)); 1316 default: 1317 logit("%s: invalid type field", __func__); 1318 return (0); 1319 } 1320 } 1321 1322 /* Please see the notes above wtmp_islogin() for information about the 1323 next two functions */ 1324 1325 /* Return true if this wtmpx entry indicates a login */ 1326 static int 1327 wtmpx_islogin(struct logininfo *li, struct utmpx *utx) 1328 { 1329 if (strncmp(li->username, utx->ut_user, 1330 MIN_SIZEOF(li->username, utx->ut_user)) == 0 ) { 1331 # ifdef HAVE_TYPE_IN_UTMPX 1332 if (utx->ut_type == USER_PROCESS) 1333 return (1); 1334 # else 1335 return (1); 1336 # endif 1337 } 1338 return (0); 1339 } 1340 1341 1342 int 1343 wtmpx_get_entry(struct logininfo *li) 1344 { 1345 struct stat st; 1346 struct utmpx utx; 1347 int fd, found=0; 1348 1349 /* Clear the time entries */ 1350 li->tv_sec = li->tv_usec = 0; 1351 1352 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { 1353 logit("%s: problem opening %s: %s", __func__, 1354 WTMPX_FILE, strerror(errno)); 1355 return (0); 1356 } 1357 if (fstat(fd, &st) != 0) { 1358 logit("%s: couldn't stat %s: %s", __func__, 1359 WTMPX_FILE, strerror(errno)); 1360 close(fd); 1361 return (0); 1362 } 1363 1364 /* Seek to the start of the last struct utmpx */ 1365 if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) { 1366 /* probably a newly rotated wtmpx file */ 1367 close(fd); 1368 return (0); 1369 } 1370 1371 while (!found) { 1372 if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) { 1373 logit("%s: read of %s failed: %s", __func__, 1374 WTMPX_FILE, strerror(errno)); 1375 close (fd); 1376 return (0); 1377 } 1378 /* 1379 * Logouts are recorded as a blank username on a particular 1380 * line. So, we just need to find the username in struct utmpx 1381 */ 1382 if (wtmpx_islogin(li, &utx)) { 1383 found = 1; 1384 # if defined(HAVE_TV_IN_UTMPX) 1385 li->tv_sec = utx.ut_tv.tv_sec; 1386 # elif defined(HAVE_TIME_IN_UTMPX) 1387 li->tv_sec = utx.ut_time; 1388 # endif 1389 line_fullname(li->line, utx.ut_line, sizeof(li->line)); 1390 # if defined(HAVE_HOST_IN_UTMPX) 1391 strlcpy(li->hostname, utx.ut_host, 1392 MIN_SIZEOF(li->hostname, utx.ut_host)); 1393 # endif 1394 continue; 1395 } 1396 if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) { 1397 close(fd); 1398 return (0); 1399 } 1400 } 1401 1402 close(fd); 1403 return (1); 1404 } 1405 #endif /* USE_WTMPX */ 1406 1407 /** 1408 ** Low-level libutil login() functions 1409 **/ 1410 1411 #ifdef USE_LOGIN 1412 static int 1413 syslogin_perform_login(struct logininfo *li) 1414 { 1415 struct utmp *ut; 1416 1417 ut = xmalloc(sizeof(*ut)); 1418 construct_utmp(li, ut); 1419 login(ut); 1420 free(ut); 1421 1422 return (1); 1423 } 1424 1425 static int 1426 syslogin_perform_logout(struct logininfo *li) 1427 { 1428 # ifdef HAVE_LOGOUT 1429 char line[UT_LINESIZE]; 1430 1431 (void)line_stripname(line, li->line, sizeof(line)); 1432 1433 if (!logout(line)) 1434 logit("%s: logout() returned an error", __func__); 1435 # ifdef HAVE_LOGWTMP 1436 else 1437 logwtmp(line, "", ""); 1438 # endif 1439 /* FIXME: (ATL - if the need arises) What to do if we have 1440 * login, but no logout? what if logout but no logwtmp? All 1441 * routines are in libutil so they should all be there, 1442 * but... */ 1443 # endif 1444 return (1); 1445 } 1446 1447 int 1448 syslogin_write_entry(struct logininfo *li) 1449 { 1450 switch (li->type) { 1451 case LTYPE_LOGIN: 1452 return (syslogin_perform_login(li)); 1453 case LTYPE_LOGOUT: 1454 return (syslogin_perform_logout(li)); 1455 default: 1456 logit("%s: Invalid type field", __func__); 1457 return (0); 1458 } 1459 } 1460 #endif /* USE_LOGIN */ 1461 1462 /* end of file log-syslogin.c */ 1463 1464 /** 1465 ** Low-level lastlog functions 1466 **/ 1467 1468 #ifdef USE_LASTLOG 1469 1470 #if !defined(LASTLOG_WRITE_PUTUTXLINE) || !defined(HAVE_GETLASTLOGXBYNAME) 1471 /* open the file (using filemode) and seek to the login entry */ 1472 static int 1473 lastlog_openseek(struct logininfo *li, int *fd, int filemode) 1474 { 1475 off_t offset; 1476 char lastlog_file[1024]; 1477 struct stat st; 1478 1479 if (stat(LASTLOG_FILE, &st) != 0) { 1480 logit("%s: Couldn't stat %s: %s", __func__, 1481 LASTLOG_FILE, strerror(errno)); 1482 return (0); 1483 } 1484 if (S_ISDIR(st.st_mode)) { 1485 snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", 1486 LASTLOG_FILE, li->username); 1487 } else if (S_ISREG(st.st_mode)) { 1488 strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file)); 1489 } else { 1490 logit("%s: %.100s is not a file or directory!", __func__, 1491 LASTLOG_FILE); 1492 return (0); 1493 } 1494 1495 *fd = open(lastlog_file, filemode, 0600); 1496 if (*fd < 0) { 1497 debug("%s: Couldn't open %s: %s", __func__, 1498 lastlog_file, strerror(errno)); 1499 return (0); 1500 } 1501 1502 if (S_ISREG(st.st_mode)) { 1503 /* find this uid's offset in the lastlog file */ 1504 offset = (off_t) ((long)li->uid * sizeof(struct lastlog)); 1505 1506 if (lseek(*fd, offset, SEEK_SET) != offset) { 1507 logit("%s: %s->lseek(): %s", __func__, 1508 lastlog_file, strerror(errno)); 1509 return (0); 1510 } 1511 } 1512 1513 return (1); 1514 } 1515 #endif /* !LASTLOG_WRITE_PUTUTXLINE || !HAVE_GETLASTLOGXBYNAME */ 1516 1517 #ifdef LASTLOG_WRITE_PUTUTXLINE 1518 int 1519 lastlog_write_entry(struct logininfo *li) 1520 { 1521 switch(li->type) { 1522 case LTYPE_LOGIN: 1523 return 1; /* lastlog written by pututxline */ 1524 default: 1525 logit("lastlog_write_entry: Invalid type field"); 1526 return 0; 1527 } 1528 } 1529 #else /* LASTLOG_WRITE_PUTUTXLINE */ 1530 int 1531 lastlog_write_entry(struct logininfo *li) 1532 { 1533 struct lastlog last; 1534 int fd; 1535 1536 switch(li->type) { 1537 case LTYPE_LOGIN: 1538 /* create our struct lastlog */ 1539 memset(&last, '\0', sizeof(last)); 1540 line_stripname(last.ll_line, li->line, sizeof(last.ll_line)); 1541 strlcpy(last.ll_host, li->hostname, 1542 MIN_SIZEOF(last.ll_host, li->hostname)); 1543 last.ll_time = li->tv_sec; 1544 1545 if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT)) 1546 return (0); 1547 1548 /* write the entry */ 1549 if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) { 1550 close(fd); 1551 logit("%s: Error writing to %s: %s", __func__, 1552 LASTLOG_FILE, strerror(errno)); 1553 return (0); 1554 } 1555 1556 close(fd); 1557 return (1); 1558 default: 1559 logit("%s: Invalid type field", __func__); 1560 return (0); 1561 } 1562 } 1563 #endif /* LASTLOG_WRITE_PUTUTXLINE */ 1564 1565 #ifdef HAVE_GETLASTLOGXBYNAME 1566 int 1567 lastlog_get_entry(struct logininfo *li) 1568 { 1569 struct lastlogx l, *ll; 1570 1571 if ((ll = getlastlogxbyname(li->username, &l)) == NULL) { 1572 memset(&l, '\0', sizeof(l)); 1573 ll = &l; 1574 } 1575 line_fullname(li->line, ll->ll_line, sizeof(li->line)); 1576 strlcpy(li->hostname, ll->ll_host, 1577 MIN_SIZEOF(li->hostname, ll->ll_host)); 1578 li->tv_sec = ll->ll_tv.tv_sec; 1579 li->tv_usec = ll->ll_tv.tv_usec; 1580 return (1); 1581 } 1582 #else /* HAVE_GETLASTLOGXBYNAME */ 1583 int 1584 lastlog_get_entry(struct logininfo *li) 1585 { 1586 struct lastlog last; 1587 int fd, ret; 1588 1589 if (!lastlog_openseek(li, &fd, O_RDONLY)) 1590 return (0); 1591 1592 ret = atomicio(read, fd, &last, sizeof(last)); 1593 close(fd); 1594 1595 switch (ret) { 1596 case 0: 1597 memset(&last, '\0', sizeof(last)); 1598 /* FALLTHRU */ 1599 case sizeof(last): 1600 line_fullname(li->line, last.ll_line, sizeof(li->line)); 1601 strlcpy(li->hostname, last.ll_host, 1602 MIN_SIZEOF(li->hostname, last.ll_host)); 1603 li->tv_sec = last.ll_time; 1604 return (1); 1605 case -1: 1606 error("%s: Error reading from %s: %s", __func__, 1607 LASTLOG_FILE, strerror(errno)); 1608 return (0); 1609 default: 1610 error("%s: Error reading from %s: Expecting %d, got %d", 1611 __func__, LASTLOG_FILE, (int)sizeof(last), ret); 1612 return (0); 1613 } 1614 1615 /* NOTREACHED */ 1616 return (0); 1617 } 1618 #endif /* HAVE_GETLASTLOGXBYNAME */ 1619 #endif /* USE_LASTLOG */ 1620 1621 #if defined(USE_UTMPX) && defined(HAVE_SETUTXDB) && \ 1622 defined(UTXDB_LASTLOGIN) && defined(HAVE_GETUTXUSER) 1623 int 1624 utmpx_get_entry(struct logininfo *li) 1625 { 1626 struct utmpx *utx; 1627 1628 if (setutxdb(UTXDB_LASTLOGIN, NULL) != 0) 1629 return (0); 1630 utx = getutxuser(li->username); 1631 if (utx == NULL) { 1632 endutxent(); 1633 return (0); 1634 } 1635 1636 line_fullname(li->line, utx->ut_line, 1637 MIN_SIZEOF(li->line, utx->ut_line)); 1638 strlcpy(li->hostname, utx->ut_host, 1639 MIN_SIZEOF(li->hostname, utx->ut_host)); 1640 li->tv_sec = utx->ut_tv.tv_sec; 1641 li->tv_usec = utx->ut_tv.tv_usec; 1642 endutxent(); 1643 return (1); 1644 } 1645 #endif /* USE_UTMPX && HAVE_SETUTXDB && UTXDB_LASTLOGIN && HAVE_GETUTXUSER */ 1646 1647 #ifdef USE_BTMP 1648 /* 1649 * Logs failed login attempts in _PATH_BTMP if that exists. 1650 * The most common login failure is to give password instead of username. 1651 * So the _PATH_BTMP file checked for the correct permission, so that 1652 * only root can read it. 1653 */ 1654 1655 void 1656 record_failed_login(const char *username, const char *hostname, 1657 const char *ttyn) 1658 { 1659 int fd; 1660 struct utmp ut; 1661 struct sockaddr_storage from; 1662 socklen_t fromlen = sizeof(from); 1663 struct sockaddr_in *a4; 1664 struct sockaddr_in6 *a6; 1665 time_t t; 1666 struct stat fst; 1667 1668 if (geteuid() != 0) 1669 return; 1670 if ((fd = open(_PATH_BTMP, O_WRONLY | O_APPEND)) < 0) { 1671 debug("Unable to open the btmp file %s: %s", _PATH_BTMP, 1672 strerror(errno)); 1673 return; 1674 } 1675 if (fstat(fd, &fst) < 0) { 1676 logit("%s: fstat of %s failed: %s", __func__, _PATH_BTMP, 1677 strerror(errno)); 1678 goto out; 1679 } 1680 if((fst.st_mode & (S_IRWXG | S_IRWXO)) || (fst.st_uid != 0)){ 1681 logit("Excess permission or bad ownership on file %s", 1682 _PATH_BTMP); 1683 goto out; 1684 } 1685 1686 memset(&ut, 0, sizeof(ut)); 1687 /* strncpy because we don't necessarily want nul termination */ 1688 strncpy(ut.ut_user, username, sizeof(ut.ut_user)); 1689 strlcpy(ut.ut_line, "ssh:notty", sizeof(ut.ut_line)); 1690 1691 time(&t); 1692 ut.ut_time = t; /* ut_time is not always a time_t */ 1693 ut.ut_type = LOGIN_PROCESS; 1694 ut.ut_pid = getpid(); 1695 1696 /* strncpy because we don't necessarily want nul termination */ 1697 strncpy(ut.ut_host, hostname, sizeof(ut.ut_host)); 1698 1699 if (packet_connection_is_on_socket() && 1700 getpeername(packet_get_connection_in(), 1701 (struct sockaddr *)&from, &fromlen) == 0) { 1702 ipv64_normalise_mapped(&from, &fromlen); 1703 if (from.ss_family == AF_INET) { 1704 a4 = (struct sockaddr_in *)&from; 1705 memcpy(&ut.ut_addr, &(a4->sin_addr), 1706 MIN_SIZEOF(ut.ut_addr, a4->sin_addr)); 1707 } 1708 #ifdef HAVE_ADDR_V6_IN_UTMP 1709 if (from.ss_family == AF_INET6) { 1710 a6 = (struct sockaddr_in6 *)&from; 1711 memcpy(&ut.ut_addr_v6, &(a6->sin6_addr), 1712 MIN_SIZEOF(ut.ut_addr_v6, a6->sin6_addr)); 1713 } 1714 #endif 1715 } 1716 1717 if (atomicio(vwrite, fd, &ut, sizeof(ut)) != sizeof(ut)) 1718 error("Failed to write to %s: %s", _PATH_BTMP, 1719 strerror(errno)); 1720 1721 out: 1722 close(fd); 1723 } 1724 #endif /* USE_BTMP */ 1725