| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Passphrase pixie for Catacomb |
| 4 | * |
| 5 | * (c) 1999 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of Catacomb. |
| 11 | * |
| 12 | * Catacomb is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU Library General Public License as |
| 14 | * published by the Free Software Foundation; either version 2 of the |
| 15 | * License, or (at your option) any later version. |
| 16 | * |
| 17 | * Catacomb is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU Library General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU Library General Public |
| 23 | * License along with Catacomb; if not, write to the Free |
| 24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 25 | * MA 02111-1307, USA. |
| 26 | */ |
| 27 | |
| 28 | /*----- Header files ------------------------------------------------------*/ |
| 29 | |
| 30 | #include "config.h" |
| 31 | |
| 32 | #include <assert.h> |
| 33 | #include <ctype.h> |
| 34 | #include <errno.h> |
| 35 | #include <signal.h> |
| 36 | #include <stdarg.h> |
| 37 | #include <stddef.h> |
| 38 | #include <stdio.h> |
| 39 | #include <stdlib.h> |
| 40 | #include <string.h> |
| 41 | #include <time.h> |
| 42 | |
| 43 | #include <sys/types.h> |
| 44 | #include <sys/time.h> |
| 45 | #include <unistd.h> |
| 46 | #include <sys/stat.h> |
| 47 | #include <sys/wait.h> |
| 48 | #include <pwd.h> |
| 49 | #include <fcntl.h> |
| 50 | #include <sys/ioctl.h> |
| 51 | #include <termios.h> |
| 52 | #include <syslog.h> |
| 53 | |
| 54 | #include <sys/socket.h> |
| 55 | #include <sys/un.h> |
| 56 | |
| 57 | #include <mLib/alloc.h> |
| 58 | #include <mLib/dstr.h> |
| 59 | #include <mLib/fdflags.h> |
| 60 | #include <mLib/mdwopt.h> |
| 61 | #include <mLib/quis.h> |
| 62 | #include <mLib/report.h> |
| 63 | #include <mLib/sel.h> |
| 64 | #include <mLib/selbuf.h> |
| 65 | #include <mLib/sig.h> |
| 66 | #include <mLib/str.h> |
| 67 | #include <mLib/sub.h> |
| 68 | #include <mLib/tv.h> |
| 69 | |
| 70 | #include "arena.h" |
| 71 | #include "lmem.h" |
| 72 | #include "passphrase.h" |
| 73 | #include "pixie.h" |
| 74 | |
| 75 | /*----- Static variables --------------------------------------------------*/ |
| 76 | |
| 77 | static unsigned long timeout = 900; |
| 78 | static sel_state sel; |
| 79 | static unsigned verbose = 1; |
| 80 | static const char *command = 0; |
| 81 | static lmem lm; |
| 82 | static unsigned flags = 0; |
| 83 | |
| 84 | #define F_SYSLOG 1u |
| 85 | #define F_FETCH 2u |
| 86 | #define F_REPLACE 4u |
| 87 | |
| 88 | /*----- Event logging -----------------------------------------------------*/ |
| 89 | |
| 90 | /* --- @pxlog@ --- * |
| 91 | * |
| 92 | * Arguments: @const char *p@ = @printf@-style format string |
| 93 | * @...@ = extra arguments to fill in |
| 94 | * |
| 95 | * Returns: --- |
| 96 | * |
| 97 | * Use: Writes out a timestamped log message. |
| 98 | */ |
| 99 | |
| 100 | static void PRINTF_LIKE(1, 2) pxlog(const char *p, ...) |
| 101 | { |
| 102 | dstr d = DSTR_INIT; |
| 103 | va_list ap; |
| 104 | |
| 105 | if (!(flags & F_SYSLOG)) { |
| 106 | time_t t = time(0); |
| 107 | struct tm *tm = localtime(&t); |
| 108 | DENSURE(&d, 64); |
| 109 | d.len += strftime(d.buf, d.sz, "%Y-%m-%d %H:%M:%S ", tm); |
| 110 | } |
| 111 | va_start(ap, p); |
| 112 | dstr_vputf(&d, p, &ap); |
| 113 | va_end(ap); |
| 114 | |
| 115 | if (flags & F_SYSLOG) |
| 116 | syslog(LOG_NOTICE, "%s", d.buf); |
| 117 | else { |
| 118 | DPUTC(&d, '\n'); |
| 119 | dstr_write(&d, stderr); |
| 120 | } |
| 121 | DDESTROY(&d); |
| 122 | } |
| 123 | |
| 124 | /*----- Passphrase management ---------------------------------------------*/ |
| 125 | |
| 126 | /* --- Data structures --- */ |
| 127 | |
| 128 | typedef struct phrase { |
| 129 | struct phrase *next, *prev; |
| 130 | char *tag; |
| 131 | char *p; |
| 132 | unsigned long t; |
| 133 | sel_timer timer; |
| 134 | unsigned f; |
| 135 | } phrase; |
| 136 | |
| 137 | /* --- Variables --- */ |
| 138 | |
| 139 | static phrase *p_head = 0, *p_tail = 0; |
| 140 | |
| 141 | /* --- Utility macros --- */ |
| 142 | |
| 143 | #define P_LINKTAIL(p) do { \ |
| 144 | (p)->next = 0; \ |
| 145 | (p)->prev = p_tail; \ |
| 146 | *(p_tail ? &p_tail->next : &p_head) = (p); \ |
| 147 | p_tail = (p); \ |
| 148 | } while (0) |
| 149 | |
| 150 | #define P_UNLINK(p) do { \ |
| 151 | *((p)->next ? &(p)->next->prev : &p_tail) = (p)->prev; \ |
| 152 | *((p)->prev ? &(p)->prev->next : &p_head) = (p)->next; \ |
| 153 | } while (0) |
| 154 | |
| 155 | /* --- @p_free@ --- * |
| 156 | * |
| 157 | * Arguments: @phrase *p@ = pointer to phrase block |
| 158 | * |
| 159 | * Returns: --- |
| 160 | * |
| 161 | * Use: Frees a phrase block. |
| 162 | */ |
| 163 | |
| 164 | static void p_free(phrase *p) |
| 165 | { |
| 166 | if (p->t) |
| 167 | sel_rmtimer(&p->timer); |
| 168 | xfree(p->tag); |
| 169 | l_free(&lm, p->p); |
| 170 | P_UNLINK(p); |
| 171 | DESTROY(p); |
| 172 | } |
| 173 | |
| 174 | /* --- @p_timer@ --- * |
| 175 | * |
| 176 | * Arguments: @struct timeval *tv@ = current time |
| 177 | * @void *p@ = pointer to phrase |
| 178 | * |
| 179 | * Returns: --- |
| 180 | * |
| 181 | * Use: Expires a passphrase. |
| 182 | */ |
| 183 | |
| 184 | static void p_timer(struct timeval *tv, void *p) |
| 185 | { |
| 186 | phrase *pp = p; |
| 187 | if (verbose) |
| 188 | pxlog("expiring passphrase `%s'", pp->tag); |
| 189 | p_free(pp); |
| 190 | } |
| 191 | |
| 192 | /* --- @p_alloc@ --- * |
| 193 | * |
| 194 | * Arguments: @size_t sz@ = amount of memory required |
| 195 | * |
| 196 | * Returns: Pointer to allocated memory, or null. |
| 197 | * |
| 198 | * Use: Allocates some locked memory, flushing old passphrases if |
| 199 | * there's not enough space. |
| 200 | */ |
| 201 | |
| 202 | static void *p_alloc(size_t sz) |
| 203 | { |
| 204 | for (;;) { |
| 205 | char *p; |
| 206 | if ((p = l_alloc(&lm, sz)) != 0) |
| 207 | return (p); |
| 208 | if (!p_head) |
| 209 | return (0); |
| 210 | if (verbose) { |
| 211 | pxlog("flushing passphrase `%s' to free up needed space", |
| 212 | p_head->tag); |
| 213 | } |
| 214 | p_free(p_head); |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | /* --- @p_find@ --- * |
| 219 | * |
| 220 | * Arguments: @const char *tag@ = pointer to tag to find |
| 221 | * |
| 222 | * Returns: Pointer to passphrase block, or null. |
| 223 | * |
| 224 | * Use: Finds a passphrase with a given tag. |
| 225 | */ |
| 226 | |
| 227 | static phrase *p_find(const char *tag) |
| 228 | { |
| 229 | phrase *p; |
| 230 | |
| 231 | for (p = p_head; p; p = p->next) { |
| 232 | if (strcmp(p->tag, tag) == 0) { |
| 233 | if (p->t) { |
| 234 | struct timeval tv; |
| 235 | sel_rmtimer(&p->timer); |
| 236 | gettimeofday(&tv, 0); |
| 237 | tv.tv_sec += p->t; |
| 238 | sel_addtimer(&sel, &p->timer, &tv, p_timer, p); |
| 239 | } |
| 240 | P_UNLINK(p); |
| 241 | P_LINKTAIL(p); |
| 242 | return (p); |
| 243 | } |
| 244 | } |
| 245 | return (0); |
| 246 | } |
| 247 | |
| 248 | /* --- @p_add@ --- * |
| 249 | * |
| 250 | * Arguments: @const char *tag@ = pointer to tag string |
| 251 | * @const char *p@ = pointer to passphrase |
| 252 | * @unsigned long t@ = expiry timeout |
| 253 | * |
| 254 | * Returns: Pointer to newly-added passphrase. |
| 255 | * |
| 256 | * Use: Adds a new passphrase. The tag must not already exist. |
| 257 | */ |
| 258 | |
| 259 | static phrase *p_add(const char *tag, const char *p, unsigned long t) |
| 260 | { |
| 261 | size_t sz = strlen(p) + 1; |
| 262 | char *l = p_alloc(sz); |
| 263 | phrase *pp; |
| 264 | |
| 265 | /* --- Make sure the locked memory was allocated --- */ |
| 266 | |
| 267 | if (!l) |
| 268 | return (0); |
| 269 | |
| 270 | /* --- Fill in some other bits of the block --- */ |
| 271 | |
| 272 | pp = CREATE(phrase); |
| 273 | memcpy(l, p, sz); |
| 274 | pp->p = l; |
| 275 | pp->tag = xstrdup(tag); |
| 276 | pp->f = 0; |
| 277 | |
| 278 | /* --- Set the timer --- */ |
| 279 | |
| 280 | pp->t = t; |
| 281 | if (t) { |
| 282 | struct timeval tv; |
| 283 | gettimeofday(&tv, 0); |
| 284 | tv.tv_sec += t; |
| 285 | sel_addtimer(&sel, &pp->timer, &tv, p_timer, pp); |
| 286 | } |
| 287 | |
| 288 | /* --- Link the block into the chain --- */ |
| 289 | |
| 290 | P_LINKTAIL(pp); |
| 291 | return (pp); |
| 292 | } |
| 293 | |
| 294 | /* --- @p_flush@ --- * |
| 295 | * |
| 296 | * Arguments: @const char *tag@ = pointer to tag string, or zero for all |
| 297 | * |
| 298 | * Returns: --- |
| 299 | * |
| 300 | * Use: Immediately flushes either a single phrase or all of them. |
| 301 | */ |
| 302 | |
| 303 | static void p_flush(const char *tag) |
| 304 | { |
| 305 | phrase *p; |
| 306 | |
| 307 | if (!tag && verbose > 1) |
| 308 | pxlog("flushing all passphrases"); |
| 309 | p = p_head; |
| 310 | while (p) { |
| 311 | phrase *pp = p->next; |
| 312 | if (!tag) |
| 313 | p_free(p); |
| 314 | else if (strcmp(p->tag, tag) == 0) { |
| 315 | if (verbose > 1) |
| 316 | pxlog("flushing passphrase `%s'", tag); |
| 317 | p_free(p); |
| 318 | break; |
| 319 | } |
| 320 | p = pp; |
| 321 | } |
| 322 | } |
| 323 | |
| 324 | /*----- Reading passphrases -----------------------------------------------*/ |
| 325 | |
| 326 | /* --- @p_request@ --- * |
| 327 | * |
| 328 | * Arguments: @const char *msg@ = message string |
| 329 | * @const char *tag@ = pointer to tag string |
| 330 | * @char *buf@ = pointer to (locked) buffer |
| 331 | * @size_t sz@ = size of buffer |
| 332 | * |
| 333 | * Returns: Zero if all went well, nonzero otherwise. |
| 334 | * |
| 335 | * Use: Requests a passphrase from the user. |
| 336 | */ |
| 337 | |
| 338 | static int p_request(const char *msg, const char *tag, char *buf, size_t sz) |
| 339 | { |
| 340 | /* --- If there's a passphrase-fetching command, run it --- */ |
| 341 | |
| 342 | if (command) { |
| 343 | dstr d = DSTR_INIT; |
| 344 | const char *p; |
| 345 | int fd[2]; |
| 346 | pid_t kid; |
| 347 | int r; |
| 348 | int rc; |
| 349 | |
| 350 | /* --- Substitute the prompt string into the command --- */ |
| 351 | |
| 352 | p = command; |
| 353 | for (;;) { |
| 354 | const char *q = strchr(p, '%'); |
| 355 | if (!q || !q[1]) { |
| 356 | DPUTS(&d, p); |
| 357 | break; |
| 358 | } |
| 359 | DPUTM(&d, p, q - p); |
| 360 | p = q + 1; |
| 361 | switch (*p) { |
| 362 | case 'm': |
| 363 | DPUTS(&d, msg); |
| 364 | break; |
| 365 | case 't': |
| 366 | DPUTS(&d, tag); |
| 367 | break; |
| 368 | default: |
| 369 | DPUTC(&d, '%'); |
| 370 | DPUTC(&d, *p); |
| 371 | break; |
| 372 | } |
| 373 | p++; |
| 374 | } |
| 375 | DPUTZ(&d); |
| 376 | |
| 377 | /* --- Create a pipe and start a child process --- */ |
| 378 | |
| 379 | if (pipe(fd)) |
| 380 | goto fail_1; |
| 381 | if ((kid = fork()) < 0) |
| 382 | goto fail_2; |
| 383 | |
| 384 | /* --- Child process --- */ |
| 385 | |
| 386 | fflush(0); |
| 387 | if (kid == 0) { |
| 388 | if (dup2(fd[1], STDOUT_FILENO) < 0) |
| 389 | _exit(127); |
| 390 | close(fd[0]); |
| 391 | execl("/bin/sh", "sh", "-c", d.buf, (char *)0); |
| 392 | _exit(127); |
| 393 | } |
| 394 | |
| 395 | /* --- Read the data back into my buffer --- */ |
| 396 | |
| 397 | close(fd[1]); |
| 398 | if ((r = read(fd[0], buf, sz - 1)) >= 0) { |
| 399 | char *q = memchr(buf, '\n', r); |
| 400 | if (!q) |
| 401 | q = buf + r; |
| 402 | *q = 0; |
| 403 | } |
| 404 | close(fd[0]); |
| 405 | waitpid(kid, &rc, 0); |
| 406 | dstr_destroy(&d); |
| 407 | if (r < 0 || rc != 0) |
| 408 | goto fail_0; |
| 409 | goto ok; |
| 410 | |
| 411 | /* --- Tidy up when things go wrong --- */ |
| 412 | |
| 413 | fail_2: |
| 414 | close(fd[0]); |
| 415 | close(fd[1]); |
| 416 | fail_1: |
| 417 | dstr_destroy(&d); |
| 418 | fail_0: |
| 419 | return (-1); |
| 420 | } |
| 421 | |
| 422 | /* --- Read a passphrase from the terminal --- * |
| 423 | * |
| 424 | * Use the standard Catacomb passphrase-reading function, so it'll read the |
| 425 | * passphrase from a file descriptor or something if the appropriate |
| 426 | * environment variable is set. |
| 427 | */ |
| 428 | |
| 429 | { |
| 430 | dstr d = DSTR_INIT; |
| 431 | int rc; |
| 432 | dstr_putf(&d, "%s %s: ", msg, tag); |
| 433 | rc = pixie_getpass(d.buf, buf, sz); |
| 434 | dstr_destroy(&d); |
| 435 | if (rc) |
| 436 | return (rc); |
| 437 | goto ok; |
| 438 | } |
| 439 | |
| 440 | /* --- Sort out the buffer --- * |
| 441 | * |
| 442 | * Strip leading spaces. |
| 443 | */ |
| 444 | |
| 445 | ok: { |
| 446 | char *p = buf; |
| 447 | size_t len; |
| 448 | while (isspace((unsigned char)*p)) |
| 449 | p++; |
| 450 | len = strlen(p); |
| 451 | memmove(buf, p, len); |
| 452 | p[len] = 0; |
| 453 | } |
| 454 | |
| 455 | /* --- Done --- */ |
| 456 | |
| 457 | return (0); |
| 458 | } |
| 459 | |
| 460 | /* --- @p_get@ --- * |
| 461 | * |
| 462 | * Arguments: @const char **q@ = where to store the result |
| 463 | * @const char *tag@ = pointer to tag string |
| 464 | * @unsigned mode@ = reading mode (verify?) |
| 465 | * @time_t exp@ = expiry time suggestion |
| 466 | * |
| 467 | * Returns: Zero if successful, @-1@ on a read failure, or @+1@ if the |
| 468 | * passphrase is missing and there is no fetcher. (This will |
| 469 | * always happen if there is no fetcher and @mode@ is |
| 470 | * @PMODE_VERIFY@. |
| 471 | * |
| 472 | * Use: Reads a passphrase from somewhere. |
| 473 | */ |
| 474 | |
| 475 | static int p_get(const char **q, const char *tag, unsigned mode, time_t exp) |
| 476 | { |
| 477 | #define LBUFSZ 1024 |
| 478 | |
| 479 | phrase *p; |
| 480 | char *pp = 0; |
| 481 | |
| 482 | /* --- Write a log message --- */ |
| 483 | |
| 484 | if (verbose > 1) |
| 485 | pxlog("passphrase `%s' requested", tag); |
| 486 | |
| 487 | /* --- If there is no fetcher, life is simpler --- */ |
| 488 | |
| 489 | if (!(flags & F_FETCH)) { |
| 490 | if (mode == PMODE_VERIFY) |
| 491 | return (+1); |
| 492 | if ((p = p_find(tag)) == 0) |
| 493 | return (+1); |
| 494 | *q = p->p; |
| 495 | return (0); |
| 496 | } |
| 497 | |
| 498 | /* --- Try to find the phrase --- */ |
| 499 | |
| 500 | if (mode == PMODE_VERIFY) |
| 501 | p_flush(tag); |
| 502 | if (mode == PMODE_VERIFY || (p = p_find(tag)) == 0) { |
| 503 | if ((pp = p_alloc(LBUFSZ)) == 0) |
| 504 | goto fail; |
| 505 | if (p_request(mode == PMODE_READ ? "Passphrase" : "New passphrase", |
| 506 | tag, pp, LBUFSZ) < 0) |
| 507 | goto fail; |
| 508 | p = p_add(tag, pp, exp); |
| 509 | if (!p) |
| 510 | goto fail; |
| 511 | } |
| 512 | |
| 513 | /* --- If verification is requested, verify the passphrase --- */ |
| 514 | |
| 515 | if (mode == PMODE_VERIFY) { |
| 516 | if (!pp && (pp = p_alloc(LBUFSZ)) == 0) |
| 517 | goto fail; |
| 518 | if (p_request("Verify passphrase", tag, pp, LBUFSZ) < 0) |
| 519 | goto fail; |
| 520 | if (strcmp(pp, p->p) != 0) { |
| 521 | if (verbose) |
| 522 | pxlog("passphrases for `%s' don't match", tag); |
| 523 | p_free(p); |
| 524 | goto fail; |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | /* --- Tidy up and return the passphrase --- */ |
| 529 | |
| 530 | if (pp) { |
| 531 | memset(pp, 0, LBUFSZ); |
| 532 | l_free(&lm, pp); |
| 533 | } |
| 534 | *q = p->p; |
| 535 | return (0); |
| 536 | |
| 537 | /* --- Tidy up if things went wrong --- */ |
| 538 | |
| 539 | fail: |
| 540 | if (pp) { |
| 541 | memset(pp, 0, LBUFSZ); |
| 542 | l_free(&lm, pp); |
| 543 | } |
| 544 | return (-1); |
| 545 | |
| 546 | #undef LBUFSZ |
| 547 | } |
| 548 | |
| 549 | /*----- Server command parsing --------------------------------------------*/ |
| 550 | |
| 551 | /* --- Data structures --- */ |
| 552 | |
| 553 | typedef struct pixserv { |
| 554 | selbuf b; |
| 555 | int fd; |
| 556 | sel_timer timer; |
| 557 | unsigned f; |
| 558 | } pixserv; |
| 559 | |
| 560 | #define px_stdin 1u |
| 561 | |
| 562 | #define PIXSERV_TIMEOUT 30 |
| 563 | |
| 564 | /* --- @pixserv_expire@ --- * |
| 565 | * |
| 566 | * Arguments: @struct timeval *tv@ = pointer to current time |
| 567 | * @void *p@ = pointer to server block |
| 568 | * |
| 569 | * Returns: --- |
| 570 | * |
| 571 | * Use: Expires a pixie connection if the remote end decides he's not |
| 572 | * interested any more. |
| 573 | */ |
| 574 | |
| 575 | static void pixserv_expire(struct timeval *tv, void *p) |
| 576 | { |
| 577 | pixserv *px = p; |
| 578 | if (px->fd != px->b.reader.fd) |
| 579 | close(px->fd); |
| 580 | selbuf_destroy(&px->b); |
| 581 | close(px->b.reader.fd); |
| 582 | DESTROY(px); |
| 583 | } |
| 584 | |
| 585 | /* --- @pixserv_write@ --- * |
| 586 | * |
| 587 | * Arguments: @pixserv *px@ = pointer to server block |
| 588 | * @const char *p@ = pointer to skeleton string |
| 589 | * @...@ = other arguments to fill in |
| 590 | * |
| 591 | * Returns: Zero on success, @-1@ on error. |
| 592 | * |
| 593 | * Use: Formats a string and emits it to the output file. |
| 594 | */ |
| 595 | |
| 596 | static int PRINTF_LIKE(2, 3) pixserv_write(pixserv *px, const char *p, ...) |
| 597 | { |
| 598 | dstr d = DSTR_INIT; |
| 599 | va_list ap; |
| 600 | int rc; |
| 601 | |
| 602 | va_start(ap, p); |
| 603 | dstr_vputf(&d, p, &ap); |
| 604 | rc = write(px->fd, d.buf, d.len); |
| 605 | va_end(ap); |
| 606 | dstr_destroy(&d); |
| 607 | if (rc < 0) { |
| 608 | pxlog("failed to write to client: %s (closing)", strerror(errno)); |
| 609 | return (-1); |
| 610 | } |
| 611 | return (0); |
| 612 | } |
| 613 | |
| 614 | /* --- @pixserv_timeout@ --- * |
| 615 | * |
| 616 | * Arguments: @const char *p@ = pointer to timeout string |
| 617 | * |
| 618 | * Returns: Timeout in seconds. |
| 619 | * |
| 620 | * Use: Translates a string to a timeout value in seconds. |
| 621 | */ |
| 622 | |
| 623 | static unsigned long pixserv_timeout(const char *p) |
| 624 | { |
| 625 | unsigned long t; |
| 626 | char *q; |
| 627 | |
| 628 | if (!p) |
| 629 | return (timeout); |
| 630 | |
| 631 | t = strtoul(p, &q, 0); |
| 632 | switch (*q) { |
| 633 | case 'd': t *= 24; |
| 634 | case 'h': t *= 60; |
| 635 | case 'm': t *= 60; |
| 636 | case 's': if (q[1] != 0) |
| 637 | default: t = 0; |
| 638 | case 0: break; |
| 639 | } |
| 640 | return (t); |
| 641 | } |
| 642 | |
| 643 | /* --- @pixserv_line@ --- * |
| 644 | * |
| 645 | * Arguments: @char *s@ = pointer to the line read |
| 646 | * @size_t len@ = length of the line |
| 647 | * @void *p@ = pointer to server block |
| 648 | * |
| 649 | * Returns: --- |
| 650 | * |
| 651 | * Use: Handles a line read from the client. |
| 652 | */ |
| 653 | |
| 654 | static void pixserv_line(char *s, size_t len, void *p) |
| 655 | { |
| 656 | pixserv *px = p; |
| 657 | char *q, *qq; |
| 658 | unsigned mode; |
| 659 | |
| 660 | /* --- Handle an end-of-file --- */ |
| 661 | |
| 662 | if (!(px->f & px_stdin)) |
| 663 | sel_rmtimer(&px->timer); |
| 664 | if (!s) goto close; |
| 665 | |
| 666 | /* --- Fiddle the timeout --- */ |
| 667 | |
| 668 | if (!(px->f & px_stdin)) { |
| 669 | struct timeval tv; |
| 670 | gettimeofday(&tv, 0); |
| 671 | tv.tv_sec += PIXSERV_TIMEOUT; |
| 672 | sel_addtimer(&sel, &px->timer, &tv, pixserv_expire, px); |
| 673 | } |
| 674 | |
| 675 | /* --- Scan out the first word --- */ |
| 676 | |
| 677 | if ((q = str_getword(&s)) == 0) |
| 678 | return; |
| 679 | for (qq = q; *qq; qq++) |
| 680 | *qq = tolower((unsigned char)*qq); |
| 681 | |
| 682 | /* --- Handle a help request --- */ |
| 683 | |
| 684 | if (strcmp(q, "help") == 0) { |
| 685 | if (pixserv_write(px, "\ |
| 686 | INFO Commands supported:\n\ |
| 687 | INFO flush [TAG]\n\ |
| 688 | INFO help\n\ |
| 689 | INFO list\n\ |
| 690 | INFO pass TAG [EXPIRE]\n\ |
| 691 | INFO quit\n\ |
| 692 | INFO set TAG [EXPIRE] -- PHRASE\n\ |
| 693 | INFO verify TAG [EXPIRE]\n\ |
| 694 | OK\n\ |
| 695 | ")) |
| 696 | goto close; |
| 697 | } |
| 698 | |
| 699 | /* --- List the passphrases --- */ |
| 700 | |
| 701 | else if (strcmp(q, "list") == 0) { |
| 702 | phrase *p; |
| 703 | |
| 704 | for (p = p_head; p; p = p->next) { |
| 705 | if (!p->t) { |
| 706 | if (pixserv_write(px, "ITEM %s no-expire\n", p->tag)) goto close; |
| 707 | } else { |
| 708 | struct timeval tv; |
| 709 | gettimeofday(&tv, 0); |
| 710 | TV_SUB(&tv, &p->timer.tv, &tv); |
| 711 | if (pixserv_write(px, "ITEM %s %lu\n", |
| 712 | p->tag, (unsigned long)tv.tv_sec)) |
| 713 | goto close; |
| 714 | } |
| 715 | } |
| 716 | if (pixserv_write(px, "OK\n")) goto close; |
| 717 | } |
| 718 | |
| 719 | /* --- Request a passphrase --- */ |
| 720 | |
| 721 | else if ((mode = PMODE_READ, strcmp(q, "pass") == 0) || |
| 722 | (mode = PMODE_VERIFY, strcmp(q, "verify") == 0)) { |
| 723 | unsigned long t; |
| 724 | const char *p; |
| 725 | int rc; |
| 726 | |
| 727 | if ((q = str_getword(&s)) == 0) |
| 728 | pixserv_write(px, "FAIL missing tag\n"); |
| 729 | else if ((t = pixserv_timeout(s)) == 0) |
| 730 | pixserv_write(px, "FAIL bad timeout\n"); |
| 731 | else { |
| 732 | rc = p_get(&p, q, mode, t > timeout ? timeout : t); |
| 733 | switch (rc) { |
| 734 | case 0: |
| 735 | if (pixserv_write(px, "OK %s\n", p)) goto close; |
| 736 | break; |
| 737 | case -1: |
| 738 | if (pixserv_write(px, "FAIL error reading passphrase\n")) |
| 739 | goto close; |
| 740 | break; |
| 741 | case +1: |
| 742 | if (pixserv_write(px, "MISSING\n")) goto close; |
| 743 | break; |
| 744 | } |
| 745 | } |
| 746 | } |
| 747 | |
| 748 | /* --- Flush existing passphrases --- */ |
| 749 | |
| 750 | else if (strcmp(q, "flush") == 0) { |
| 751 | q = str_getword(&s); |
| 752 | p_flush(q); |
| 753 | if (pixserv_write(px, "OK\n")) goto close; |
| 754 | } |
| 755 | |
| 756 | /* --- Set a passphrase --- */ |
| 757 | |
| 758 | else if (strcmp(q, "set") == 0) { |
| 759 | char *tag; |
| 760 | unsigned long t; |
| 761 | if ((tag = str_getword(&s)) == 0) { |
| 762 | if (pixserv_write(px, "FAIL missing tag\n")) goto close; |
| 763 | } else if ((q = str_getword(&s)) == 0) { |
| 764 | if (pixserv_write(px, "FAIL no passphrase\n")) goto close; |
| 765 | } else { |
| 766 | if (strcmp(q, "--") != 0) { |
| 767 | t = pixserv_timeout(q); |
| 768 | q = str_getword(&s); |
| 769 | } else |
| 770 | t = pixserv_timeout(0); |
| 771 | if (!q) { |
| 772 | if (pixserv_write(px, "FAIL no passphrase\n")) goto close; |
| 773 | } else if (strcmp(q, "--") != 0) { |
| 774 | if (pixserv_write(px, "FAIL rubbish found before passphrase\n")) |
| 775 | goto close; |
| 776 | } else { |
| 777 | p_flush(tag); |
| 778 | p_add(tag, s, t); |
| 779 | if (pixserv_write(px, "OK\n")) goto close; |
| 780 | } |
| 781 | } |
| 782 | } |
| 783 | |
| 784 | /* --- Shut the server down --- */ |
| 785 | |
| 786 | else if (strcmp(q, "quit") == 0) { |
| 787 | if (verbose) { |
| 788 | pxlog("%s client requested shutdown", |
| 789 | px->f & px_stdin ? "local" : "remote"); |
| 790 | } |
| 791 | if (pixserv_write(px, "OK\n")) goto close; |
| 792 | exit(0); |
| 793 | } |
| 794 | |
| 795 | /* --- Report an error for other commands --- */ |
| 796 | |
| 797 | else { |
| 798 | if (pixserv_write(px, "FAIL unknown command `%s'\n", q)) goto close; |
| 799 | } |
| 800 | return; |
| 801 | |
| 802 | close: |
| 803 | if (px->fd != px->b.reader.fd) |
| 804 | close(px->fd); |
| 805 | selbuf_destroy(&px->b); |
| 806 | close(px->b.reader.fd); |
| 807 | } |
| 808 | |
| 809 | /* --- @pixserv_create@ --- * |
| 810 | * |
| 811 | * Arguments: @int fd@ = file descriptor to read from |
| 812 | * @int ofd@ = file descriptor to write to |
| 813 | * |
| 814 | * Returns: Pointer to the new connection. |
| 815 | * |
| 816 | * Use: Creates a new Pixie server instance for a new connection. |
| 817 | */ |
| 818 | |
| 819 | static pixserv *pixserv_create(int fd, int ofd) |
| 820 | { |
| 821 | pixserv *px = CREATE(pixserv); |
| 822 | struct timeval tv; |
| 823 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
| 824 | if (ofd != fd) |
| 825 | fdflags(ofd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
| 826 | px->fd = ofd; |
| 827 | selbuf_init(&px->b, &sel, fd, pixserv_line, px); |
| 828 | px->b.b.a = arena_secure; |
| 829 | selbuf_setsize(&px->b, 1024); |
| 830 | gettimeofday(&tv, 0); |
| 831 | tv.tv_sec += PIXSERV_TIMEOUT; |
| 832 | sel_addtimer(&sel, &px->timer, &tv, pixserv_expire, px); |
| 833 | px->f = 0; |
| 834 | return (px); |
| 835 | } |
| 836 | |
| 837 | /* --- @pixserv_accept@ --- * |
| 838 | * |
| 839 | * Arguments: @int fd@ = file descriptor |
| 840 | * @unsigned mode@ = what's happened |
| 841 | * @void *p@ = an uninteresting argument |
| 842 | * |
| 843 | * Returns: --- |
| 844 | * |
| 845 | * Use: Accepts a new connection. |
| 846 | */ |
| 847 | |
| 848 | static void pixserv_accept(int fd, unsigned mode, void *p) |
| 849 | { |
| 850 | int nfd; |
| 851 | struct sockaddr_un sun; |
| 852 | socklen_t sunsz = sizeof(sun); |
| 853 | |
| 854 | if (mode != SEL_READ) |
| 855 | return; |
| 856 | if ((nfd = accept(fd, (struct sockaddr *)&sun, &sunsz)) < 0) { |
| 857 | if (verbose && errno != EAGAIN && errno != EWOULDBLOCK && |
| 858 | errno != ECONNABORTED && errno != EPROTO && errno != EINTR) |
| 859 | pxlog("new connection failed: %s", strerror(errno)); |
| 860 | return; |
| 861 | } |
| 862 | pixserv_create(nfd, nfd); |
| 863 | } |
| 864 | |
| 865 | /*----- Setting up the server ---------------------------------------------*/ |
| 866 | |
| 867 | /* --- @unlinksocket@ --- * |
| 868 | * |
| 869 | * Arguments: --- |
| 870 | * |
| 871 | * Returns: --- |
| 872 | * |
| 873 | * Use: Tidies up the socket when it's finished with. |
| 874 | */ |
| 875 | |
| 876 | static char *sockpath; |
| 877 | |
| 878 | static void unlinksocket(void) |
| 879 | { |
| 880 | unlink(sockpath); |
| 881 | l_purge(&lm); |
| 882 | } |
| 883 | |
| 884 | /* --- @pix_sigdie@ --- * |
| 885 | * |
| 886 | * Arguments: @int sig@ = signal number |
| 887 | * @void *p@ = uninteresting argument |
| 888 | * |
| 889 | * Returns: --- |
| 890 | * |
| 891 | * Use: Shuts down the program after a fatal signal. |
| 892 | */ |
| 893 | |
| 894 | static void pix_sigdie(int sig, void *p) |
| 895 | { |
| 896 | if (verbose) { |
| 897 | char *p; |
| 898 | char buf[20]; |
| 899 | |
| 900 | switch (sig) { |
| 901 | case SIGTERM: p = "SIGTERM"; break; |
| 902 | case SIGINT: p = "SIGINT"; break; |
| 903 | default: |
| 904 | sprintf(buf, "signal %i", sig); |
| 905 | p = buf; |
| 906 | break; |
| 907 | } |
| 908 | pxlog("shutting down on %s", p); |
| 909 | } |
| 910 | exit(0); |
| 911 | } |
| 912 | |
| 913 | /* --- @pix_sigflush@ --- * |
| 914 | * |
| 915 | * Arguments: @int sig@ = signal number |
| 916 | * @void *p@ = uninteresting argument |
| 917 | * |
| 918 | * Returns: --- |
| 919 | * |
| 920 | * Use: Flushes the passphrase cache on receipt of a signal. |
| 921 | */ |
| 922 | |
| 923 | static void pix_sigflush(int sig, void *p) |
| 924 | { |
| 925 | if (verbose) { |
| 926 | char *p; |
| 927 | char buf[20]; |
| 928 | |
| 929 | switch (sig) { |
| 930 | case SIGHUP: p = "SIGHUP"; break; |
| 931 | case SIGQUIT: p = "SIGQUIT"; break; |
| 932 | default: |
| 933 | sprintf(buf, "signal %i", sig); |
| 934 | p = buf; |
| 935 | break; |
| 936 | } |
| 937 | pxlog("received %s; flushing passphrases", p); |
| 938 | } |
| 939 | p_flush(0); |
| 940 | } |
| 941 | |
| 942 | /* --- @pix_setup@ --- * |
| 943 | * |
| 944 | * Arguments: @struct sockaddr_un *sun@ = pointer to address to use |
| 945 | * @size_t sz@ = size of socket address |
| 946 | * |
| 947 | * Returns: --- |
| 948 | * |
| 949 | * Use: Sets up the pixie's Unix-domain socket. |
| 950 | */ |
| 951 | |
| 952 | static void pix_setup(struct sockaddr_un *sun, size_t sz) |
| 953 | { |
| 954 | int fd; |
| 955 | |
| 956 | /* --- Set up the parent directory --- */ |
| 957 | |
| 958 | { |
| 959 | char *p = sun->sun_path; |
| 960 | char *q = strrchr(p, '/'); |
| 961 | |
| 962 | if (q) { |
| 963 | dstr d = DSTR_INIT; |
| 964 | struct stat st; |
| 965 | |
| 966 | DPUTM(&d, p, q - p); |
| 967 | DPUTZ(&d); |
| 968 | |
| 969 | mkdir(d.buf, 0700); |
| 970 | if (stat(d.buf, &st)) |
| 971 | die(1, "couldn't stat `%s': %s", d.buf, strerror(errno)); |
| 972 | if (!S_ISDIR(st.st_mode)) |
| 973 | die(1, "object `%s' isn't a directory", d.buf); |
| 974 | if (st.st_mode & 0077) |
| 975 | die(1, "parent directory `%s' has group or world access", d.buf); |
| 976 | dstr_destroy(&d); |
| 977 | } |
| 978 | } |
| 979 | |
| 980 | /* --- Initialize the socket --- */ |
| 981 | |
| 982 | { |
| 983 | int n = 5; |
| 984 | int e; |
| 985 | |
| 986 | umask(0077); |
| 987 | again: |
| 988 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
| 989 | die(1, "couldn't create socket: %s", strerror(errno)); |
| 990 | if (bind(fd, (struct sockaddr *)sun, sz) < 0) { |
| 991 | e = errno; |
| 992 | if (errno != EADDRINUSE) |
| 993 | die(1, "couldn't bind to address: %s", strerror(e)); |
| 994 | if (!n) |
| 995 | die(1, "too many retries; giving up"); |
| 996 | n--; |
| 997 | if (connect(fd, (struct sockaddr *)sun, sz)) { |
| 998 | struct stat st; |
| 999 | if (errno != ECONNREFUSED) |
| 1000 | die(1, "couldn't bind to address: %s", strerror(e)); |
| 1001 | if (stat(sun->sun_path, &st)) |
| 1002 | die(1, "couldn't stat `%s': %s", sun->sun_path, strerror(errno)); |
| 1003 | if (!S_ISSOCK(st.st_mode)) |
| 1004 | die(1, "object `%s' isn't a socket", sun->sun_path); |
| 1005 | if (verbose) |
| 1006 | pxlog("stale socket found; removing it"); |
| 1007 | unlink(sun->sun_path); |
| 1008 | close(fd); |
| 1009 | } else if (flags & F_REPLACE) { |
| 1010 | if (verbose) |
| 1011 | pxlog("server already running; shutting it down"); |
| 1012 | if (write(fd, "QUIT\n", 5) < 0) { |
| 1013 | die(EXIT_FAILURE, "failed to shut down old server: %s", |
| 1014 | strerror(errno)); |
| 1015 | } |
| 1016 | sleep(1); |
| 1017 | close(fd); |
| 1018 | } else |
| 1019 | die(EXIT_FAILURE, "pixie already running; not starting"); |
| 1020 | goto again; |
| 1021 | } |
| 1022 | chmod(sun->sun_path, 0600); |
| 1023 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
| 1024 | if (listen(fd, 5)) |
| 1025 | die(1, "couldn't listen on socket: %s", strerror(errno)); |
| 1026 | } |
| 1027 | |
| 1028 | /* --- Set up the rest of the server --- */ |
| 1029 | |
| 1030 | { |
| 1031 | static sel_file serv; |
| 1032 | sockpath = sun->sun_path; |
| 1033 | atexit(unlinksocket); |
| 1034 | sel_initfile(&sel, &serv, fd, SEL_READ, pixserv_accept, 0); |
| 1035 | sel_addfile(&serv); |
| 1036 | } |
| 1037 | } |
| 1038 | |
| 1039 | /*----- Client support code -----------------------------------------------*/ |
| 1040 | |
| 1041 | /* --- Variables --- */ |
| 1042 | |
| 1043 | static selbuf c_server, c_client; |
| 1044 | static unsigned c_flags = 0; |
| 1045 | |
| 1046 | #define cf_uclose 1u |
| 1047 | #define cf_sclose 2u |
| 1048 | #define cf_cooked 4u |
| 1049 | |
| 1050 | /* --- Line handler functions --- */ |
| 1051 | |
| 1052 | static void c_uline(char *s, size_t len, void *p) |
| 1053 | { |
| 1054 | if (!s) { |
| 1055 | selbuf_destroy(&c_client); |
| 1056 | shutdown(c_server.reader.fd, 1); |
| 1057 | c_flags |= cf_uclose; |
| 1058 | } else { |
| 1059 | s[len++] = '\n'; |
| 1060 | if (write(c_server.reader.fd, s, len) < 0) |
| 1061 | die(EXIT_FAILURE, "failed to read from stdin: %s", strerror(errno)); |
| 1062 | } |
| 1063 | } |
| 1064 | |
| 1065 | static void c_sline(char *s, size_t len, void *p) |
| 1066 | { |
| 1067 | if (!s) { |
| 1068 | selbuf_destroy(&c_server); |
| 1069 | if (!(c_flags & cf_uclose)) { |
| 1070 | moan("server closed the connection"); |
| 1071 | selbuf_destroy(&c_client); |
| 1072 | } |
| 1073 | exit(0); |
| 1074 | } |
| 1075 | if (!(c_flags & cf_cooked)) |
| 1076 | puts(s); |
| 1077 | else { |
| 1078 | char *q = str_getword(&s); |
| 1079 | if (strcmp(q, "FAIL") == 0) |
| 1080 | die(1, "%s", s); |
| 1081 | else if (strcmp(q, "INFO") == 0 || |
| 1082 | strcmp(q, "ITEM") == 0) |
| 1083 | puts(s); |
| 1084 | else if (strcmp(q, "OK") == 0) { |
| 1085 | if (s && *s) puts(s); |
| 1086 | } else if (strcmp(q, "MISSING") == 0) |
| 1087 | ; |
| 1088 | else |
| 1089 | moan("unexpected output: %s %s", q, s); |
| 1090 | } |
| 1091 | } |
| 1092 | |
| 1093 | /* --- @pix_client@ --- * |
| 1094 | * |
| 1095 | * Arguments: @struct sockaddr_un *sun@ = pointer to socket address |
| 1096 | * @size_t sz@ = size of socket address |
| 1097 | * @char *argv[]@ = pointer to arguments to send |
| 1098 | * |
| 1099 | * Returns: --- |
| 1100 | * |
| 1101 | * Use: Performs client-side actions for the passphrase pixie. |
| 1102 | */ |
| 1103 | |
| 1104 | static void pix_client(struct sockaddr_un *sun, size_t sz, char *argv[]) |
| 1105 | { |
| 1106 | int fd; |
| 1107 | |
| 1108 | /* --- Dispose of locked memory --- */ |
| 1109 | |
| 1110 | l_destroy(&lm); |
| 1111 | |
| 1112 | /* --- Open the socket --- */ |
| 1113 | |
| 1114 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
| 1115 | die(1, "couldn't create socket: %s", strerror(errno)); |
| 1116 | if (connect(fd, (struct sockaddr *)sun, sz)) |
| 1117 | die(1, "couldn't connect to server: %s", strerror(errno)); |
| 1118 | selbuf_init(&c_server, &sel, fd, c_sline, 0); |
| 1119 | |
| 1120 | /* --- If there are any arguments, turn them into a string --- */ |
| 1121 | |
| 1122 | if (!*argv) |
| 1123 | selbuf_init(&c_client, &sel, STDIN_FILENO, c_uline, 0); |
| 1124 | else { |
| 1125 | dstr d = DSTR_INIT; |
| 1126 | DPUTS(&d, *argv++); |
| 1127 | while (*argv) { |
| 1128 | DPUTC(&d, ' '); |
| 1129 | DPUTS(&d, *argv++); |
| 1130 | } |
| 1131 | DPUTC(&d, '\n'); |
| 1132 | if (write(fd, d.buf, d.len) < 0 || shutdown(fd, 1)) |
| 1133 | die(EXIT_FAILURE, "failed to write command: %s", strerror(errno)); |
| 1134 | c_flags |= cf_uclose | cf_cooked; |
| 1135 | dstr_destroy(&d); |
| 1136 | } |
| 1137 | |
| 1138 | /* --- And repeat --- */ |
| 1139 | |
| 1140 | for (;;) { |
| 1141 | if (sel_select(&sel)) |
| 1142 | die(EXIT_FAILURE, "select error: %s", strerror(errno)); |
| 1143 | } |
| 1144 | } |
| 1145 | |
| 1146 | /*----- Main code ---------------------------------------------------------*/ |
| 1147 | |
| 1148 | /* --- @help@, @version@, @usage@ --- * |
| 1149 | * |
| 1150 | * Arguments: @FILE *fp@ = stream to write on |
| 1151 | * |
| 1152 | * Returns: --- |
| 1153 | * |
| 1154 | * Use: Emit helpful messages. |
| 1155 | */ |
| 1156 | |
| 1157 | static void usage(FILE *fp) |
| 1158 | { |
| 1159 | pquis(fp, "\ |
| 1160 | Usage:\n\ |
| 1161 | $ [-qvfidl] [-c COMMAND] [-t TIMEOUT] [-s SOCKET]\n\ |
| 1162 | $ [-s SOCKET] -C [COMMAND ARGS...]\n\ |
| 1163 | $ [-s SOCKET] -P[P] TAG\n\ |
| 1164 | "); |
| 1165 | } |
| 1166 | |
| 1167 | static void version(FILE *fp) |
| 1168 | { |
| 1169 | pquis(fp, "$, Catacomb version " VERSION "\n"); |
| 1170 | } |
| 1171 | |
| 1172 | static void help(FILE *fp) |
| 1173 | { |
| 1174 | version(fp); |
| 1175 | fputc('\n', fp); |
| 1176 | usage(fp); |
| 1177 | pquis(fp, "\n\ |
| 1178 | The Catacomb passphrase pixie collects and caches passphrases used to\n\ |
| 1179 | protect important keys. Options provided:\n\ |
| 1180 | \n\ |
| 1181 | -h, --help Show this help text.\n\ |
| 1182 | -V, --version Show the program's version number.\n\ |
| 1183 | -u, --usage Show a (very) terse usage summary.\n\ |
| 1184 | \n\ |
| 1185 | -C, --client Connect to a running pixie as a client.\n\ |
| 1186 | -P, --passphrase Request passphrase TAG and print to stdout.\n\ |
| 1187 | -PP, --verify-passphrase\n\ |
| 1188 | Verify passphrase TAG and print to stdout.\n\ |
| 1189 | \n\ |
| 1190 | -q, --quiet Emit fewer log messages.\n\ |
| 1191 | -v, --version Emit more log messages.\n\ |
| 1192 | -s, --socket=FILE Name the pixie's socket.\n\ |
| 1193 | -r, --replace Replace existing pixie, if one is running.\n\ |
| 1194 | -c, --command=COMMAND Shell command to read a passphrase.\n\ |
| 1195 | -f, --fetch Fetch passphrases from the terminal.\n\ |
| 1196 | -t, --timeout=TIMEOUT Length of time to retain a passphrase in memory.\n\ |
| 1197 | -i, --interactive Allow commands to be typed interactively.\n\ |
| 1198 | -d, --daemon Fork into the background after initialization.\n\ |
| 1199 | -l, --syslog Emit log messages to the system log.\n\ |
| 1200 | \n\ |
| 1201 | The COMMAND may contain `%m' and `%t' markers which are replaced by a\n\ |
| 1202 | prompt message and the passphrase tag respectively. The TIMEOUT is an\n\ |
| 1203 | integer, optionally followed by `d', `h', `m' or `s' to specify units of\n\ |
| 1204 | days, hours, minutes or seconds respectively.\n\ |
| 1205 | \n\ |
| 1206 | In client mode, if a command is specified on the command line, it is sent\n\ |
| 1207 | to the running server; otherwise the program reads requests from stdin.\n\ |
| 1208 | Responses from the pixie are written to stdout. Send a HELP request for\n\ |
| 1209 | a quick summary of the pixie communication protocol.\n\ |
| 1210 | "); |
| 1211 | } |
| 1212 | |
| 1213 | /* --- @main@ --- * |
| 1214 | * |
| 1215 | * Arguments: @int argc@ = number of arguments |
| 1216 | * @char *argv[]@ = vector of argument values |
| 1217 | * |
| 1218 | * Returns: Zero if OK. |
| 1219 | * |
| 1220 | * Use: Main program. Listens on a socket and responds with a PGP |
| 1221 | * passphrase when asked. |
| 1222 | */ |
| 1223 | |
| 1224 | int main(int argc, char *argv[]) |
| 1225 | { |
| 1226 | char *path = 0; |
| 1227 | struct sockaddr_un *sun; |
| 1228 | size_t sz; |
| 1229 | unsigned f = 0; |
| 1230 | |
| 1231 | #define f_bogus 1u |
| 1232 | #define f_client 2u |
| 1233 | #define f_stdin 4u |
| 1234 | #define f_daemon 8u |
| 1235 | #define f_syslog 16u |
| 1236 | #define f_fetch 32u |
| 1237 | #define f_verify 64u |
| 1238 | |
| 1239 | /* --- Initialize libraries --- */ |
| 1240 | |
| 1241 | ego(argv[0]); |
| 1242 | sub_init(); |
| 1243 | |
| 1244 | /* --- Set up the locked memory area --- */ |
| 1245 | |
| 1246 | l_init(&lm, 16384); |
| 1247 | setuid(getuid()); |
| 1248 | |
| 1249 | /* --- Parse command line arguments --- */ |
| 1250 | |
| 1251 | for (;;) { |
| 1252 | static struct option opts[] = { |
| 1253 | |
| 1254 | /* --- Standard GNUy help options --- */ |
| 1255 | |
| 1256 | { "help", 0, 0, 'h' }, |
| 1257 | { "version", 0, 0, 'V' }, |
| 1258 | { "usage", 0, 0, 'u' }, |
| 1259 | |
| 1260 | /* --- Other options --- */ |
| 1261 | |
| 1262 | { "quiet", 0, 0, 'q' }, |
| 1263 | { "verbose", 0, 0, 'v' }, |
| 1264 | { "client", 0, 0, 'C' }, |
| 1265 | { "passphrase", 0, 0, 'P' }, |
| 1266 | { "verify-passphrase", 0, 0, '+' }, |
| 1267 | { "socket", OPTF_ARGREQ, 0, 's' }, |
| 1268 | { "replace", 0, 0, 'r' }, |
| 1269 | { "command", OPTF_ARGREQ, 0, 'c' }, |
| 1270 | { "fetch", 0, 0, 'f' }, |
| 1271 | { "timeout", OPTF_ARGREQ, 0, 't' }, |
| 1272 | { "interactive", 0, 0, 'i' }, |
| 1273 | { "stdin", 0, 0, 'i' }, |
| 1274 | { "daemon", 0, 0, 'd' }, |
| 1275 | { "log", 0, 0, 'l' }, |
| 1276 | { "syslog", 0, 0, 'l' }, |
| 1277 | |
| 1278 | /* --- Magic terminator --- */ |
| 1279 | |
| 1280 | { 0, 0, 0, 0 } |
| 1281 | }; |
| 1282 | |
| 1283 | int i = mdwopt(argc, argv, "hVuqvCPs:rc:ft:idl", opts, 0, 0, 0); |
| 1284 | if (i < 0) |
| 1285 | break; |
| 1286 | |
| 1287 | switch (i) { |
| 1288 | |
| 1289 | /* --- GNUy help options --- */ |
| 1290 | |
| 1291 | case 'h': |
| 1292 | help(stdout); |
| 1293 | exit(0); |
| 1294 | case 'V': |
| 1295 | version(stdout); |
| 1296 | exit(0); |
| 1297 | case 'u': |
| 1298 | usage(stdout); |
| 1299 | exit(0); |
| 1300 | |
| 1301 | /* --- Other interesting things --- */ |
| 1302 | |
| 1303 | case 'q': |
| 1304 | if (verbose) |
| 1305 | verbose--; |
| 1306 | break; |
| 1307 | case 'v': |
| 1308 | verbose++; |
| 1309 | break; |
| 1310 | case 'C': |
| 1311 | f |= f_client; |
| 1312 | f &= ~f_fetch; |
| 1313 | break; |
| 1314 | case 'P': |
| 1315 | if (!(f & f_fetch)) |
| 1316 | f |= f_fetch; |
| 1317 | else |
| 1318 | f |= f_verify; |
| 1319 | break; |
| 1320 | case '+': |
| 1321 | f |= f_fetch | f_verify; |
| 1322 | f &= ~f_client; |
| 1323 | break; |
| 1324 | case 's': |
| 1325 | path = optarg; |
| 1326 | break; |
| 1327 | case 'r': |
| 1328 | flags |= F_REPLACE; |
| 1329 | break; |
| 1330 | case 't': |
| 1331 | if ((timeout = pixserv_timeout(optarg)) == 0) |
| 1332 | die(1, "bad timeout `%s'", optarg); |
| 1333 | break; |
| 1334 | case 'c': |
| 1335 | command = optarg; |
| 1336 | flags |= F_FETCH; |
| 1337 | break; |
| 1338 | case 'f': |
| 1339 | flags |= F_FETCH; |
| 1340 | break; |
| 1341 | case 'i': |
| 1342 | f |= f_stdin; |
| 1343 | break; |
| 1344 | case 'd': |
| 1345 | f |= f_daemon; |
| 1346 | break; |
| 1347 | case 'l': |
| 1348 | f |= f_syslog; |
| 1349 | break; |
| 1350 | |
| 1351 | /* --- Something else --- */ |
| 1352 | |
| 1353 | default: |
| 1354 | f |= f_bogus; |
| 1355 | break; |
| 1356 | } |
| 1357 | } |
| 1358 | |
| 1359 | if (f & f_bogus || |
| 1360 | (optind < argc && !(f & (f_client|f_fetch))) || |
| 1361 | ((f & f_fetch) && optind != argc - 1)) { |
| 1362 | usage(stderr); |
| 1363 | exit(1); |
| 1364 | } |
| 1365 | |
| 1366 | /* --- Handle request for a passphrase --- */ |
| 1367 | |
| 1368 | if (f & f_fetch) { |
| 1369 | char *buf = l_alloc(&lm, 1024); |
| 1370 | passphrase_connect(path); |
| 1371 | if (passphrase_read(argv[optind], |
| 1372 | (f & f_verify) ? PMODE_VERIFY : PMODE_READ, |
| 1373 | buf, 1024)) |
| 1374 | die(1, "failed to read passphrase: %s", strerror(errno)); |
| 1375 | puts(buf); |
| 1376 | return (0); |
| 1377 | } |
| 1378 | |
| 1379 | /* --- Set up the socket address --- */ |
| 1380 | |
| 1381 | sun = pixie_address(path, &sz); |
| 1382 | |
| 1383 | /* --- Initialize selectory --- */ |
| 1384 | |
| 1385 | sel_init(&sel); |
| 1386 | signal(SIGPIPE, SIG_IGN); |
| 1387 | |
| 1388 | /* --- Be a client if a client's wanted --- */ |
| 1389 | |
| 1390 | if (f & f_client) |
| 1391 | pix_client(sun, sz, argv + optind); |
| 1392 | |
| 1393 | /* --- Open the syslog if requested --- */ |
| 1394 | |
| 1395 | if (f & f_syslog) { |
| 1396 | flags |= F_SYSLOG; |
| 1397 | openlog(QUIS, 0, LOG_DAEMON); |
| 1398 | } |
| 1399 | |
| 1400 | /* --- Check on the locked memory area --- */ |
| 1401 | |
| 1402 | { |
| 1403 | dstr d = DSTR_INIT; |
| 1404 | int rc = l_report(&lm, &d); |
| 1405 | if (rc < 0) |
| 1406 | die(EXIT_FAILURE, "%s", d.buf); |
| 1407 | else if (rc && verbose) { |
| 1408 | pxlog("%s", d.buf); |
| 1409 | pxlog("couldn't lock passphrase buffer"); |
| 1410 | } |
| 1411 | dstr_destroy(&d); |
| 1412 | arena_setsecure(&lm.a); |
| 1413 | } |
| 1414 | |
| 1415 | /* --- Set signal behaviours --- */ |
| 1416 | |
| 1417 | { |
| 1418 | static sig sigint, sigterm, sigquit, sighup; |
| 1419 | struct sigaction sa; |
| 1420 | sig_init(&sel); |
| 1421 | sigaction(SIGINT, 0, &sa); |
| 1422 | if (sa.sa_handler != SIG_IGN) |
| 1423 | sig_add(&sigint, SIGINT, pix_sigdie, 0); |
| 1424 | sig_add(&sigterm, SIGTERM, pix_sigdie, 0); |
| 1425 | sig_add(&sigquit, SIGQUIT, pix_sigflush, 0); |
| 1426 | sig_add(&sighup, SIGHUP, pix_sigflush, 0); |
| 1427 | } |
| 1428 | |
| 1429 | /* --- Set up the server --- */ |
| 1430 | |
| 1431 | pix_setup(sun, sz); |
| 1432 | if (f & f_stdin) { |
| 1433 | pixserv *px = pixserv_create(STDIN_FILENO, STDOUT_FILENO); |
| 1434 | sel_rmtimer(&px->timer); |
| 1435 | px->f |= px_stdin; |
| 1436 | } |
| 1437 | |
| 1438 | /* --- Fork into the background if requested --- */ |
| 1439 | |
| 1440 | if (f & f_daemon) { |
| 1441 | pid_t kid; |
| 1442 | |
| 1443 | if (((f & f_stdin) && |
| 1444 | (isatty(STDIN_FILENO) || isatty(STDOUT_FILENO))) || |
| 1445 | (!command && (flags & F_FETCH))) |
| 1446 | die(1, "can't become a daemon if terminal required"); |
| 1447 | |
| 1448 | if ((kid = fork()) < 0) |
| 1449 | die(1, "fork failed: %s", strerror(errno)); |
| 1450 | if (kid) |
| 1451 | _exit(0); |
| 1452 | #ifdef TIOCNOTTY |
| 1453 | { |
| 1454 | int fd; |
| 1455 | if ((fd = open("/dev/tty", O_RDONLY)) >= 0) { |
| 1456 | ioctl(fd, TIOCNOTTY); |
| 1457 | close(fd); |
| 1458 | } |
| 1459 | } |
| 1460 | #endif |
| 1461 | DISCARD(chdir("/")); |
| 1462 | setsid(); |
| 1463 | |
| 1464 | if (fork() != 0) |
| 1465 | _exit(0); |
| 1466 | } |
| 1467 | |
| 1468 | if (verbose) |
| 1469 | pxlog("initialized ok"); |
| 1470 | |
| 1471 | { |
| 1472 | int selerr = 0; |
| 1473 | for (;;) { |
| 1474 | if (!sel_select(&sel)) |
| 1475 | selerr = 0; |
| 1476 | else if (errno != EINTR && errno != EAGAIN) { |
| 1477 | pxlog("error from select: %s", strerror(errno)); |
| 1478 | selerr++; |
| 1479 | if (selerr > 8) { |
| 1480 | pxlog("too many consecutive select errors: bailing out"); |
| 1481 | exit(EXIT_FAILURE); |
| 1482 | } |
| 1483 | } |
| 1484 | } |
| 1485 | } |
| 1486 | return (0); |
| 1487 | } |
| 1488 | |
| 1489 | /*----- That's all, folks -------------------------------------------------*/ |