1 /* 2 * Copyright (C) 1986-2005 The Free Software Foundation, Inc. 3 * 4 * Portions Copyright (C) 1998-2005 Derek Price, Ximbiot <http://ximbiot.com>, 5 * and others. 6 * 7 * Portions Copyright (c) 1995, Cyclic Software, Bloomington, IN, USA 8 * 9 * You may distribute under the terms of the GNU General Public License as 10 * specified in the README file that comes with CVS. 11 * 12 * Allow user to log in for an authenticating server. 13 */ 14 #include <sys/cdefs.h> 15 __RCSID("$NetBSD: login.c,v 1.3 2016/05/17 14:00:09 christos Exp $"); 16 17 #include "cvs.h" 18 #include "getline.h" 19 20 /* There seems to be very little agreement on which system header 21 getpass is declared in. With a lot of fancy autoconfiscation, 22 we could perhaps detect this, but for now we'll just rely on 23 _CRAY, since Cray is perhaps the only system on which our own 24 declaration won't work (some Crays declare the 2#$@% thing as 25 varadic, believe it or not). On Cray, getpass will be declared 26 in either stdlib.h or unistd.h. */ 27 #include "getpass.h" 28 29 #ifdef AUTH_CLIENT_SUPPORT /* This covers the rest of the file. */ 30 31 32 #ifndef CVS_PASSWORD_FILE 33 #define CVS_PASSWORD_FILE ".cvspass" 34 #endif 35 36 /* If non-NULL, get_cvs_password() will just return this. */ 37 static char *cvs_password = NULL; 38 39 static char *construct_cvspass_filename (void); 40 41 /* The return value will need to be freed. */ 42 static char * 43 construct_cvspass_filename (void) 44 { 45 char *homedir; 46 char *passfile; 47 48 /* Environment should override file. */ 49 if ((passfile = getenv ("CVS_PASSFILE")) != NULL) 50 return xstrdup (passfile); 51 52 /* Construct absolute pathname to user's password file. */ 53 /* todo: does this work under OS/2 ? */ 54 homedir = get_homedir (); 55 if (! homedir) 56 { 57 /* FIXME? This message confuses a lot of users, at least 58 on Win95 (which doesn't set HOMEDRIVE and HOMEPATH like 59 NT does). I suppose the answer for Win95 is to store the 60 passwords in the registry or something (??). And .cvsrc 61 and such too? Wonder what WinCVS does (about .cvsrc, the 62 right thing for a GUI is to just store the password in 63 memory only)... */ 64 error (1, 0, "could not find out home directory"); 65 return NULL; 66 } 67 68 passfile = strcat_filename_onto_homedir (homedir, CVS_PASSWORD_FILE); 69 70 /* Safety first and last, Scouts. */ 71 if (isfile (passfile)) 72 /* xchmod() is too polite. */ 73 chmod (passfile, 0600); 74 75 return passfile; 76 } 77 78 79 80 /* 81 * static char * 82 * password_entry_parseline ( 83 * const char *cvsroot_canonical, 84 * const unsigned char warn, 85 * const int linenumber, 86 * char *linebuf 87 * ); 88 * 89 * Internal function used by password_entry_operation. Parse a single line 90 * from a ~/.cvsroot password file and return a pointer to the password if the 91 * line refers to the same cvsroot as cvsroot_canonical 92 * 93 * INPUTS 94 * cvsroot_canonical the root we are looking for 95 * warn Boolean: print warnings for invalid lines? 96 * linenumber the line number for error messages 97 * linebuf the current line 98 * 99 * RETURNS 100 * NULL if the line doesn't match 101 * char *password as a pointer into linebuf 102 * 103 * NOTES 104 * This function temporarily alters linebuf, so it isn't thread safe when 105 * called on the same linebuf 106 */ 107 static char * 108 password_entry_parseline (const char *cvsroot_canonical, 109 const unsigned char warn, const int linenumber, 110 char *linebuf) 111 { 112 char *password = NULL; 113 char *p; 114 115 /* look for '^/' */ 116 if (*linebuf == '/') 117 { 118 /* Yes: slurp '^/\d+\D' and parse the rest of the line according to 119 * version number 120 */ 121 char *q; 122 unsigned long int entry_version = 0 /* Placate -Wall. */; 123 124 if (isspace(*(linebuf + 1))) 125 /* special case since strtoul ignores leading white space */ 126 q = linebuf + 1; 127 else 128 entry_version = strtoul (linebuf + 1, &q, 10); 129 130 if (q != linebuf + 1) 131 /* assume a delimiting seperator */ 132 q++; 133 /* else, no valid digits found by strtoul */ 134 135 switch (entry_version) 136 { 137 case 1: 138 /* this means the same normalize_cvsroot we are using was 139 * used to create this entry. strcmp is good enough for 140 * us. 141 */ 142 p = strchr (q, ' '); 143 if (p == NULL) 144 { 145 if (warn && !really_quiet) 146 error (0, 0, "warning: skipping invalid entry in password file at line %d", 147 linenumber); 148 } 149 else 150 { 151 *p = '\0'; 152 if (strcmp (cvsroot_canonical, q) == 0) 153 password = p + 1; 154 *p = ' '; 155 } 156 break; 157 case ULONG_MAX: 158 if (warn && !really_quiet) 159 { 160 error (0, errno, "warning: unable to convert version number in password file at line %d", 161 linenumber); 162 error (0, 0, "skipping entry"); 163 } 164 break; 165 case 0: 166 if (warn && !really_quiet) 167 error (0, 0, "warning: skipping entry with invalid version string in password file at line %d", 168 linenumber); 169 break; 170 default: 171 if (warn && !really_quiet) 172 error (0, 0, "warning: skipping entry with unknown version (%lu) in password file at line %d", 173 entry_version, linenumber); 174 break; 175 } 176 } 177 else 178 { 179 /* No: assume: 180 * 181 * ^cvsroot Aencoded_password$ 182 * 183 * as header comment specifies and parse accordingly 184 */ 185 cvsroot_t *tmp_root; 186 char *tmp_root_canonical; 187 188 p = strchr (linebuf, ' '); 189 if (p == NULL) 190 { 191 if (warn && !really_quiet) 192 error (0, 0, "warning: skipping invalid entry in password file at line %d", linenumber); 193 return NULL;; 194 } 195 196 *p = '\0'; 197 if ((tmp_root = parse_cvsroot (linebuf)) == NULL) 198 { 199 if (warn && !really_quiet) 200 error (0, 0, "warning: skipping invalid entry in password file at line %d", linenumber); 201 *p = ' '; 202 return NULL; 203 } 204 *p = ' '; 205 tmp_root_canonical = normalize_cvsroot (tmp_root); 206 if (strcmp (cvsroot_canonical, tmp_root_canonical) == 0) 207 password = p + 1; 208 209 free (tmp_root_canonical); 210 } 211 212 return password; 213 } 214 215 216 217 /* 218 * static char * 219 * password_entry_operation ( 220 * password_entry_operation_t operation, 221 * cvsroot_t *root, 222 * char *newpassword 223 * ); 224 * 225 * Search the password file and depending on the value of operation: 226 * 227 * Mode Action 228 * password_entry_lookup Return the password 229 * password_entry_delete Delete the entry from the file, if it 230 * exists. 231 * password_entry_add Replace the line with the new one, else 232 * append it. 233 * 234 * Because the user might be accessing multiple repositories, with 235 * different passwords for each one, the format of ~/.cvspass is: 236 * 237 * [user@]host:[port]/path Aencoded_password 238 * [user@]host:[port]/path Aencoded_password 239 * ... 240 * 241 * New entries are always of the form: 242 * 243 * /1 user@host:port/path Aencoded_password 244 * 245 * but the old format is supported for backwards compatibility. 246 * The entry version string wasn't strictly necessary, but it avoids the 247 * overhead of parsing some entries since we know it is already in canonical 248 * form and allows room for expansion later, say, if we want to allow spaces 249 * and/or other characters to be escaped in the string. Also, the new entries 250 * would have been ignored by old versions of CVS anyhow since those versions 251 * didn't know how to parse a port number. 252 * 253 * The "A" before "encoded_password" is a literal capital A. It's a 254 * version number indicating which form of scrambling we're doing on 255 * the password -- someday we might provide something more secure than 256 * the trivial encoding we do now, and when that day comes, it would 257 * be nice to remain backward-compatible. 258 * 259 * Like .netrc, the file's permissions are the only thing preventing 260 * it from being read by others. Unlike .netrc, we will not be 261 * fascist about it, at most issuing a warning, and never refusing to 262 * work. 263 * 264 * INPUTS 265 * operation operation to perform 266 * root cvsroot_t to look up 267 * newpassword prescrambled new password, for password_entry_add_mode 268 * 269 * RETURNS 270 * -1 if password_entry_lookup_mode not specified 271 * NULL on failed lookup 272 * pointer to a copy of the password string otherwise, which the caller is 273 * responsible for disposing of 274 */ 275 276 typedef enum password_entry_operation_e { 277 password_entry_lookup, 278 password_entry_delete, 279 password_entry_add 280 } password_entry_operation_t; 281 282 static char * 283 password_entry_operation (password_entry_operation_t operation, cvsroot_t *root, char *newpassword) 284 { 285 char *passfile; 286 FILE *fp; 287 char *cvsroot_canonical = NULL; 288 char *password = NULL; 289 int line_length; 290 long line = -1; 291 char *linebuf = NULL; 292 size_t linebuf_len; 293 char *p; 294 int save_errno = 0; 295 296 if (root->method != pserver_method) 297 { 298 error (0, 0, "\ 299 internal error: can only call password_entry_operation with pserver method"); 300 error (1, 0, "CVSROOT: %s", root->original); 301 } 302 303 cvsroot_canonical = normalize_cvsroot (root); 304 305 /* Yes, the method below reads the user's password file twice when we have 306 * to delete an entry. It's inefficient, but we're not talking about a gig of 307 * data here. 308 */ 309 310 passfile = construct_cvspass_filename (); 311 fp = CVS_FOPEN (passfile, "r"); 312 if (fp == NULL) 313 { 314 error (0, errno, "warning: failed to open %s for reading", passfile); 315 goto process; 316 } 317 318 /* Check each line to see if we have this entry already. */ 319 line = 0L; 320 while ((line_length = getline (&linebuf, &linebuf_len, fp)) >= 0) 321 { 322 line++; 323 password = password_entry_parseline (cvsroot_canonical, 1, line, 324 linebuf); 325 if (password != NULL) 326 /* this is it! break out and deal with linebuf */ 327 break; 328 } 329 if (line_length < 0 && !feof (fp)) 330 { 331 error (0, errno, "cannot read %s", passfile); 332 goto error_exit; 333 } 334 if (fclose (fp) < 0) 335 /* not fatal, unless it cascades */ 336 error (0, errno, "cannot close %s", passfile); 337 fp = NULL; 338 339 /* Utter, total, raving paranoia, I know. */ 340 chmod (passfile, 0600); 341 342 /* a copy to return or keep around so we can reuse linebuf */ 343 if (password != NULL) 344 { 345 /* chomp the EOL */ 346 p = strchr (password, '\n'); 347 if (p != NULL) 348 *p = '\0'; 349 password = xstrdup (password); 350 } 351 352 process: 353 354 /* might as well return now */ 355 if (operation == password_entry_lookup) 356 goto out; 357 358 /* same here */ 359 if (operation == password_entry_delete && password == NULL) 360 { 361 error (0, 0, "Entry not found."); 362 goto out; 363 } 364 365 /* okay, file errors can simply be fatal from now on since we don't do 366 * anything else if we're in lookup mode 367 */ 368 369 /* copy the file with the entry deleted unless we're in add 370 * mode and the line we found contains the same password we're supposed to 371 * add 372 */ 373 if (!noexec && password != NULL && (operation == password_entry_delete 374 || (operation == password_entry_add 375 && strcmp (password, newpassword)))) 376 { 377 long found_at = line; 378 char *tmp_name; 379 FILE *tmp_fp; 380 381 /* open the original file again */ 382 fp = CVS_FOPEN (passfile, "r"); 383 if (fp == NULL) 384 error (1, errno, "failed to open %s for reading", passfile); 385 386 /* create and open a temp file */ 387 if ((tmp_fp = cvs_temp_file (&tmp_name)) == NULL) 388 error (1, errno, "unable to open temp file %s", tmp_name); 389 390 line = 0L; 391 while ((line_length = getline (&linebuf, &linebuf_len, fp)) >= 0) 392 { 393 line++; 394 if (line < found_at 395 || (line != found_at 396 && !password_entry_parseline (cvsroot_canonical, 0, line, 397 linebuf))) 398 { 399 if (fprintf (tmp_fp, "%s", linebuf) == EOF) 400 { 401 /* try and clean up anyhow */ 402 error (0, errno, "fatal error: cannot write %s", tmp_name); 403 if (fclose (tmp_fp) == EOF) 404 error (0, errno, "cannot close %s", tmp_name); 405 /* call CVS_UNLINK instead of unlink_file since the file 406 * got created in noexec mode 407 */ 408 if (CVS_UNLINK (tmp_name) < 0) 409 error (0, errno, "cannot remove %s", tmp_name); 410 /* but quit so we don't remove all the entries from a 411 * user's password file accidentally 412 */ 413 error (1, 0, "exiting"); 414 } 415 } 416 } 417 if (line_length < 0 && !feof (fp)) 418 { 419 error (0, errno, "cannot read %s", passfile); 420 goto error_exit; 421 } 422 if (fclose (fp) < 0) 423 /* not fatal, unless it cascades */ 424 error (0, errno, "cannot close %s", passfile); 425 if (fclose (tmp_fp) < 0) 426 /* not fatal, unless it cascades */ 427 /* FIXME - does copy_file return correct results if the file wasn't 428 * closed? should this be fatal? 429 */ 430 error (0, errno, "cannot close %s", tmp_name); 431 432 /* FIXME: rename_file would make more sense (e.g. almost 433 * always faster). 434 * 435 * I don't think so, unless we change the way rename_file works to 436 * attempt a cp/rm sequence when rename fails since rename doesn't 437 * work across file systems and it isn't uncommon to have /tmp 438 * on its own partition. 439 * 440 * For that matter, it's probably not uncommon to have a home 441 * directory on an NFS mount. 442 */ 443 copy_file (tmp_name, passfile); 444 if (CVS_UNLINK (tmp_name) < 0) 445 error (0, errno, "cannot remove %s", tmp_name); 446 free (tmp_name); 447 } 448 449 /* in add mode, if we didn't find an entry or found an entry with a 450 * different password, append the new line 451 */ 452 if (!noexec && operation == password_entry_add 453 && (password == NULL || strcmp (password, newpassword))) 454 { 455 if ((fp = CVS_FOPEN (passfile, "a")) == NULL) 456 error (1, errno, "could not open %s for writing", passfile); 457 458 if (fprintf (fp, "/1 %s %s\n", cvsroot_canonical, newpassword) == EOF) 459 error (1, errno, "cannot write %s", passfile); 460 if (fclose (fp) < 0) 461 error (1, errno, "cannot close %s", passfile); 462 } 463 464 /* Utter, total, raving paranoia, I know. */ 465 chmod (passfile, 0600); 466 467 if (password) 468 { 469 free (password); 470 password = NULL; 471 } 472 if (linebuf) 473 free (linebuf); 474 475 out: 476 free (cvsroot_canonical); 477 free (passfile); 478 return password; 479 480 error_exit: 481 /* just exit when we're not in lookup mode */ 482 if (operation != password_entry_lookup) 483 error (1, 0, "fatal error: exiting"); 484 /* clean up and exit in lookup mode so we can try a login with a NULL 485 * password anyhow in case that's what we would have found 486 */ 487 save_errno = errno; 488 if (fp != NULL) 489 { 490 /* Utter, total, raving paranoia, I know. */ 491 chmod (passfile, 0600); 492 if(fclose (fp) < 0) 493 error (0, errno, "cannot close %s", passfile); 494 } 495 if (linebuf) 496 free (linebuf); 497 if (cvsroot_canonical) 498 free (cvsroot_canonical); 499 free (passfile); 500 errno = save_errno; 501 return NULL; 502 } 503 504 505 506 /* Prompt for a password, and store it in the file "CVS/.cvspass". 507 */ 508 509 static const char *const login_usage[] = 510 { 511 "Usage: %s %s\n", 512 "(Specify the --help global option for a list of other help options)\n", 513 NULL 514 }; 515 516 int 517 login (int argc, char **argv) 518 { 519 char *typed_password; 520 char *cvsroot_canonical; 521 522 if (argc < 0) 523 usage (login_usage); 524 525 if (current_parsed_root->method != pserver_method) 526 { 527 error (0, 0, "can only use `login' command with the 'pserver' method"); 528 error (1, 0, "CVSROOT: %s", current_parsed_root->original); 529 } 530 531 cvsroot_canonical = normalize_cvsroot(current_parsed_root); 532 printf ("Logging in to %s\n", cvsroot_canonical); 533 fflush (stdout); 534 535 if (current_parsed_root->password) 536 { 537 typed_password = scramble (current_parsed_root->password); 538 } 539 else 540 { 541 char *tmp; 542 tmp = getpass ("CVS password: "); 543 /* Must deal with a NULL return value here. I haven't managed to 544 * disconnect the CVS process from the tty and force a NULL return 545 * in sanity.sh, but the Linux version of getpass is documented 546 * to return NULL when it can't open /dev/tty... 547 */ 548 if (!tmp) error (1, errno, "login: Failed to read password."); 549 typed_password = scramble (tmp); 550 memset (tmp, 0, strlen (tmp)); 551 } 552 553 /* Force get_cvs_password() to use this one (when the client 554 * confirms the new password with the server), instead of 555 * consulting the file. We make a new copy because cvs_password 556 * will get zeroed by connect_to_server(). */ 557 cvs_password = xstrdup (typed_password); 558 559 connect_to_pserver (current_parsed_root, NULL, NULL, 1, 0); 560 561 password_entry_operation (password_entry_add, current_parsed_root, 562 typed_password); 563 564 free_cvs_password (typed_password); 565 free (cvsroot_canonical); 566 567 return 0; 568 } 569 570 /* Free the password returned by get_cvs_password() and also free the 571 * saved cvs_password if they are different pointers. Be paranoid 572 * about the in-memory copy of the password and overwrite it with zero 573 * bytes before doing the free(). 574 */ 575 void 576 free_cvs_password (char *password) 577 { 578 if (password && password != cvs_password) 579 { 580 memset (password, 0, strlen (password)); 581 free (password); 582 } 583 584 if (cvs_password) 585 { 586 memset (cvs_password, 0, strlen (cvs_password)); 587 free (cvs_password); 588 cvs_password = NULL; 589 } 590 } 591 592 593 /* Returns the _scrambled_ password. The server must descramble 594 before hashing and comparing. If password file not found, or 595 password not found in the file, just return NULL. */ 596 char * 597 get_cvs_password (void) 598 { 599 if (current_parsed_root->password) 600 return scramble (current_parsed_root->password); 601 602 /* If someone (i.e., login()) is calling connect_to_pserver() out of 603 context, then assume they have supplied the correct, scrambled 604 password. */ 605 if (cvs_password) 606 return xstrdup (cvs_password); 607 608 if (getenv ("CVS_PASSWORD") != NULL) 609 { 610 /* In previous versions of CVS one could specify a password in 611 * CVS_PASSWORD. This is a bad idea, because in BSD variants 612 * of unix anyone can see the environment variable with 'ps'. 613 * But for users who were using that feature we want to at 614 * least let them know what is going on. After printing this 615 * warning, we should fall through to the regular error where 616 * we tell them to run "cvs login" (unless they already ran 617 * it, of course). 618 */ 619 error (0, 0, "CVS_PASSWORD is no longer supported; ignored"); 620 } 621 622 if (current_parsed_root->method != pserver_method) 623 { 624 error (0, 0, "can only call get_cvs_password with pserver method"); 625 error (1, 0, "CVSROOT: %s", current_parsed_root->original); 626 } 627 628 return password_entry_operation (password_entry_lookup, 629 current_parsed_root, NULL); 630 } 631 632 633 634 static const char *const logout_usage[] = 635 { 636 "Usage: %s %s\n", 637 "(Specify the --help global option for a list of other help options)\n", 638 NULL 639 }; 640 641 /* Remove any entry for the CVSRoot repository found in .cvspass. */ 642 int 643 logout (int argc, char **argv) 644 { 645 char *cvsroot_canonical; 646 647 if (argc < 0) 648 usage (logout_usage); 649 650 if (current_parsed_root->method != pserver_method) 651 { 652 error (0, 0, "can only use pserver method with `logout' command"); 653 error (1, 0, "CVSROOT: %s", current_parsed_root->original); 654 } 655 656 /* Hmm. Do we want a variant of this command which deletes _all_ 657 the entries from the current .cvspass? Might be easier to 658 remember than "rm ~/.cvspass" but then again if people are 659 mucking with HOME (common in Win95 as the system doesn't set 660 it), then this variant of "cvs logout" might give a false sense 661 of security, in that it wouldn't delete entries from any 662 .cvspass files but the current one. */ 663 664 if (!quiet) 665 { 666 cvsroot_canonical = normalize_cvsroot(current_parsed_root); 667 printf ("Logging out of %s\n", cvsroot_canonical); 668 fflush (stdout); 669 free (cvsroot_canonical); 670 } 671 672 password_entry_operation (password_entry_delete, current_parsed_root, NULL); 673 674 return 0; 675 } 676 677 #endif /* AUTH_CLIENT_SUPPORT from beginning of file. */ 678
Indexes created Mon Jun 22 00:25:11 UTC 2026