netpgp.c revision 1.87
1/*- 2 * Copyright (c) 2009 The NetBSD Foundation, Inc. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to The NetBSD Foundation 6 * by Alistair Crooks (agc@NetBSD.org) 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29#include "config.h" 30 31#ifdef HAVE_SYS_CDEFS_H 32#include <sys/cdefs.h> 33#endif 34 35#if defined(__NetBSD__) 36__COPYRIGHT("@(#) Copyright (c) 2009 The NetBSD Foundation, Inc. All rights reserved."); 37__RCSID("$NetBSD: netpgp.c,v 1.87 2010/12/01 22:14:52 agc Exp $"); 38#endif 39 40#include <sys/types.h> 41#include <sys/stat.h> 42#include <sys/param.h> 43#include <sys/mman.h> 44 45#ifdef HAVE_SYS_RESOURCE_H 46#include <sys/resource.h> 47#endif 48 49#ifdef HAVE_FCNTL_H 50#include <fcntl.h> 51#endif 52 53#include <errno.h> 54#include <regex.h> 55#include <stdarg.h> 56#include <stdlib.h> 57#include <string.h> 58#include <time.h> 59 60#ifdef HAVE_UNISTD_H 61#include <unistd.h> 62#endif 63 64#include <errno.h> 65 66#ifdef HAVE_LIMITS_H 67#include <limits.h> 68#endif 69 70#include <netpgp.h> 71 72#include "packet.h" 73#include "packet-parse.h" 74#include "keyring.h" 75#include "errors.h" 76#include "packet-show.h" 77#include "create.h" 78#include "netpgpsdk.h" 79#include "memory.h" 80#include "validate.h" 81#include "readerwriter.h" 82#include "netpgpdefs.h" 83#include "crypto.h" 84#include "ssh2pgp.h" 85#include "defs.h" 86 87/* read any gpg config file */ 88static int 89conffile(netpgp_t *netpgp, char *homedir, char *userid, size_t length) 90{ 91 regmatch_t matchv[10]; 92 regex_t keyre; 93 char buf[BUFSIZ]; 94 FILE *fp; 95 96 __PGP_USED(netpgp); 97 (void) snprintf(buf, sizeof(buf), "%s/gpg.conf", homedir); 98 if ((fp = fopen(buf, "r")) == NULL) { 99 return 0; 100 } 101 (void) memset(&keyre, 0x0, sizeof(keyre)); 102 (void) regcomp(&keyre, "^[ \t]*default-key[ \t]+([0-9a-zA-F]+)", 103 REG_EXTENDED); 104 while (fgets(buf, (int)sizeof(buf), fp) != NULL) { 105 if (regexec(&keyre, buf, 10, matchv, 0) == 0) { 106 (void) memcpy(userid, &buf[(int)matchv[1].rm_so], 107 MIN((unsigned)(matchv[1].rm_eo - 108 matchv[1].rm_so), length)); 109 if (netpgp->passfp == NULL) { 110 (void) fprintf(stderr, 111 "netpgp: default key set to \"%.*s\"\n", 112 (int)(matchv[1].rm_eo - matchv[1].rm_so), 113 &buf[(int)matchv[1].rm_so]); 114 } 115 } 116 } 117 (void) fclose(fp); 118 regfree(&keyre); 119 return 1; 120} 121 122/* small function to pretty print an 8-character raw userid */ 123static char * 124userid_to_id(const uint8_t *userid, char *id) 125{ 126 static const char *hexes = "0123456789abcdef"; 127 int i; 128 129 for (i = 0; i < 8 ; i++) { 130 id[i * 2] = hexes[(unsigned)(userid[i] & 0xf0) >> 4]; 131 id[(i * 2) + 1] = hexes[userid[i] & 0xf]; 132 } 133 id[8 * 2] = 0x0; 134 return id; 135} 136 137/* print out the successful signature information */ 138static void 139resultp(pgp_io_t *io, 140 const char *f, 141 pgp_validation_t *res, 142 pgp_keyring_t *ring) 143{ 144 const pgp_key_t *key; 145 pgp_pubkey_t *sigkey; 146 unsigned from; 147 unsigned i; 148 time_t t; 149 char id[MAX_ID_LENGTH + 1]; 150 151 for (i = 0; i < res->validc; i++) { 152 (void) fprintf(io->res, 153 "Good signature for %s made %s", 154 (f) ? f : "<stdin>", 155 ctime(&res->valid_sigs[i].birthtime)); 156 if (res->duration > 0) { 157 t = res->birthtime + res->duration; 158 (void) fprintf(io->res, "Valid until %s", ctime(&t)); 159 } 160 (void) fprintf(io->res, 161 "using %s key %s\n", 162 pgp_show_pka(res->valid_sigs[i].key_alg), 163 userid_to_id(res->valid_sigs[i].signer_id, id)); 164 from = 0; 165 key = pgp_getkeybyid(io, ring, 166 (const uint8_t *) res->valid_sigs[i].signer_id, 167 &from, &sigkey); 168 if (sigkey == &key->enckey) { 169 (void) fprintf(io->res, 170 "WARNING: signature for %s made with encryption key\n", 171 (f) ? f : "<stdin>"); 172 } 173 pgp_print_keydata(io, ring, key, "signature ", &key->key.pubkey, 0); 174 } 175} 176 177/* check there's enough space in the arrays */ 178static int 179size_arrays(netpgp_t *netpgp, unsigned needed) 180{ 181 char **temp; 182 183 if (netpgp->size == 0) { 184 /* only get here first time around */ 185 netpgp->size = needed; 186 if ((netpgp->name = calloc(sizeof(char *), needed)) == NULL) { 187 (void) fprintf(stderr, "size_arrays: bad alloc\n"); 188 return 0; 189 } 190 if ((netpgp->value = calloc(sizeof(char *), needed)) == NULL) { 191 free(netpgp->name); 192 (void) fprintf(stderr, "size_arrays: bad alloc\n"); 193 return 0; 194 } 195 } else if (netpgp->c == netpgp->size) { 196 /* only uses 'needed' when filled array */ 197 netpgp->size += needed; 198 temp = realloc(netpgp->name, sizeof(char *) * needed); 199 if (temp == NULL) { 200 (void) fprintf(stderr, "size_arrays: bad alloc\n"); 201 return 0; 202 } 203 netpgp->name = temp; 204 temp = realloc(netpgp->value, sizeof(char *) * needed); 205 if (temp == NULL) { 206 (void) fprintf(stderr, "size_arrays: bad alloc\n"); 207 return 0; 208 } 209 netpgp->value = temp; 210 } 211 return 1; 212} 213 214/* find the name in the array */ 215static int 216findvar(netpgp_t *netpgp, const char *name) 217{ 218 unsigned i; 219 220 for (i = 0 ; i < netpgp->c && strcmp(netpgp->name[i], name) != 0; i++) { 221 } 222 return (i == netpgp->c) ? -1 : (int)i; 223} 224 225/* read a keyring and return it */ 226static void * 227readkeyring(netpgp_t *netpgp, const char *name) 228{ 229 pgp_keyring_t *keyring; 230 const unsigned noarmor = 0; 231 char f[MAXPATHLEN]; 232 char *filename; 233 char *homedir; 234 235 homedir = netpgp_getvar(netpgp, "homedir"); 236 if ((filename = netpgp_getvar(netpgp, name)) == NULL) { 237 (void) snprintf(f, sizeof(f), "%s/%s.gpg", homedir, name); 238 filename = f; 239 } 240 if ((keyring = calloc(1, sizeof(*keyring))) == NULL) { 241 (void) fprintf(stderr, "readkeyring: bad alloc\n"); 242 return NULL; 243 } 244 if (!pgp_keyring_fileread(keyring, noarmor, filename)) { 245 free(keyring); 246 (void) fprintf(stderr, "Can't read %s %s\n", name, filename); 247 return NULL; 248 } 249 netpgp_setvar(netpgp, name, filename); 250 return keyring; 251} 252 253/* read keys from ssh key files */ 254static int 255readsshkeys(netpgp_t *netpgp, char *homedir, const char *needseckey) 256{ 257 pgp_keyring_t *pubring; 258 pgp_keyring_t *secring; 259 struct stat st; 260 unsigned hashtype; 261 char *hash; 262 char f[MAXPATHLEN]; 263 char *filename; 264 265 if ((filename = netpgp_getvar(netpgp, "sshkeyfile")) == NULL) { 266 /* set reasonable default for RSA key */ 267 (void) snprintf(f, sizeof(f), "%s/id_rsa.pub", homedir); 268 filename = f; 269 } else if (strcmp(&filename[strlen(filename) - 4], ".pub") != 0) { 270 /* got ssh keys, check for pub file name */ 271 (void) snprintf(f, sizeof(f), "%s.pub", filename); 272 filename = f; 273 } 274 /* check the pub file exists */ 275 if (stat(filename, &st) != 0) { 276 (void) fprintf(stderr, "readsshkeys: bad pubkey filename '%s'\n", filename); 277 return 0; 278 } 279 if ((pubring = calloc(1, sizeof(*pubring))) == NULL) { 280 (void) fprintf(stderr, "readsshkeys: bad alloc\n"); 281 return 0; 282 } 283 /* openssh2 keys use md5 by default */ 284 hashtype = PGP_HASH_MD5; 285 if ((hash = netpgp_getvar(netpgp, "hash")) != NULL) { 286 /* openssh 2 hasn't really caught up to anything else yet */ 287 if (netpgp_strcasecmp(hash, "md5") == 0) { 288 hashtype = PGP_HASH_MD5; 289 } else if (netpgp_strcasecmp(hash, "sha1") == 0) { 290 hashtype = PGP_HASH_SHA1; 291 } else if (netpgp_strcasecmp(hash, "sha256") == 0) { 292 hashtype = PGP_HASH_SHA256; 293 } 294 } 295 if (!pgp_ssh2_readkeys(netpgp->io, pubring, NULL, filename, NULL, hashtype)) { 296 free(pubring); 297 (void) fprintf(stderr, "readsshkeys: can't read %s\n", 298 filename); 299 return 0; 300 } 301 if (netpgp->pubring == NULL) { 302 netpgp->pubring = pubring; 303 } else { 304 pgp_append_keyring(netpgp->pubring, pubring); 305 } 306 if (needseckey) { 307 netpgp_setvar(netpgp, "sshpubfile", filename); 308 /* try to take the ".pub" off the end */ 309 if (filename == f) { 310 f[strlen(f) - 4] = 0x0; 311 } else { 312 (void) snprintf(f, sizeof(f), "%.*s", 313 (int)strlen(filename) - 4, filename); 314 filename = f; 315 } 316 if ((secring = calloc(1, sizeof(*secring))) == NULL) { 317 (void) fprintf(stderr, "readsshkeys: bad alloc\n"); 318 return 0; 319 } 320 if (!pgp_ssh2_readkeys(netpgp->io, pubring, secring, NULL, filename, hashtype)) { 321 (void) fprintf(stderr, "readsshkeys: can't read sec %s\n", filename); 322 return 0; 323 } 324 netpgp->secring = secring; 325 netpgp_setvar(netpgp, "sshsecfile", filename); 326 } 327 return 1; 328} 329 330/* set ssh uid to first one in pubring */ 331static void 332set_first_pubring(pgp_keyring_t *pubring, char *id, size_t len, int last) 333{ 334 uint8_t *src; 335 int i; 336 int n; 337 338 (void) memset(id, 0x0, len); 339 src = pubring->keys[(last) ? pubring->keyc - 1 : 0].sigid; 340 for (i = 0, n = 0 ; i < PGP_KEY_ID_SIZE ; i += 2) { 341 n += snprintf(&id[n], len - n, "%02x%02x", src[i], src[i + 1]); 342 } 343 id[n] = 0x0; 344} 345 346/* find the time - in a specific %Y-%m-%d format - using a regexp */ 347static int 348grabdate(char *s, int64_t *t) 349{ 350 static regex_t r; 351 static int compiled; 352 regmatch_t matches[10]; 353 struct tm tm; 354 355 if (!compiled) { 356 compiled = 1; 357 (void) regcomp(&r, "([0-9][0-9][0-9][0-9])[-/]([0-9][0-9])[-/]([0-9][0-9])", REG_EXTENDED); 358 } 359 if (regexec(&r, s, 10, matches, 0) == 0) { 360 (void) memset(&tm, 0x0, sizeof(tm)); 361 tm.tm_year = (int)strtol(&s[(int)matches[1].rm_so], NULL, 10); 362 tm.tm_mon = (int)strtol(&s[(int)matches[2].rm_so], NULL, 10) - 1; 363 tm.tm_mday = (int)strtol(&s[(int)matches[3].rm_so], NULL, 10); 364 *t = mktime(&tm); 365 return 1; 366 } 367 return 0; 368} 369 370/* get expiration in seconds */ 371static uint64_t 372get_duration(char *s) 373{ 374 uint64_t now; 375 int64_t t; 376 char *mult; 377 378 if (s == NULL) { 379 return 0; 380 } 381 now = (uint64_t)strtoull(s, NULL, 10); 382 if ((mult = strchr("hdwmy", s[strlen(s) - 1])) != NULL) { 383 switch(*mult) { 384 case 'h': 385 return now * 60 * 60; 386 case 'd': 387 return now * 60 * 60 * 24; 388 case 'w': 389 return now * 60 * 60 * 24 * 7; 390 case 'm': 391 return now * 60 * 60 * 24 * 31; 392 case 'y': 393 return now * 60 * 60 * 24 * 365; 394 } 395 } 396 if (grabdate(s, &t)) { 397 return t; 398 } 399 return (uint64_t)strtoll(s, NULL, 10); 400} 401 402/* get birthtime in seconds */ 403static int64_t 404get_birthtime(char *s) 405{ 406 int64_t t; 407 408 if (s == NULL) { 409 return time(NULL); 410 } 411 if (grabdate(s, &t)) { 412 return t; 413 } 414 return (uint64_t)strtoll(s, NULL, 10); 415} 416 417/* resolve the userid */ 418static const pgp_key_t * 419resolve_userid(netpgp_t *netpgp, const pgp_keyring_t *keyring, const char *userid) 420{ 421 const pgp_key_t *key; 422 pgp_io_t *io; 423 424 if (userid == NULL) { 425 userid = netpgp_getvar(netpgp, "userid"); 426 if (userid == NULL) 427 return NULL; 428 } else if (userid[0] == '0' && userid[1] == 'x') { 429 userid += 2; 430 } 431 io = netpgp->io; 432 if ((key = pgp_getkeybyname(io, keyring, userid)) == NULL) { 433 (void) fprintf(io->errs, "Can't find key '%s'\n", userid); 434 } 435 return key; 436} 437 438/* append a key to a keyring */ 439static int 440appendkey(pgp_io_t *io, pgp_key_t *key, char *ringfile) 441{ 442 pgp_output_t *create; 443 const unsigned noarmor = 0; 444 int fd; 445 446 if ((fd = pgp_setup_file_append(&create, ringfile)) < 0) { 447 fd = pgp_setup_file_write(&create, ringfile, 0); 448 } 449 if (fd < 0) { 450 (void) fprintf(io->errs, "can't open pubring '%s'\n", ringfile); 451 return 0; 452 } 453 if (!pgp_write_xfer_pubkey(create, key, noarmor)) { 454 (void) fprintf(io->errs, "Cannot write pubkey\n"); 455 return 0; 456 } 457 pgp_teardown_file_write(create, fd); 458 return 1; 459} 460 461/* return 1 if the file contains ascii-armoured text */ 462static unsigned 463isarmoured(pgp_io_t *io, const char *f, const void *memory, const char *text) 464{ 465 regmatch_t matches[10]; 466 unsigned armoured; 467 regex_t r; 468 FILE *fp; 469 char buf[BUFSIZ]; 470 471 armoured = 0; 472 (void) regcomp(&r, text, REG_EXTENDED); 473 if (f) { 474 if ((fp = fopen(f, "r")) == NULL) { 475 (void) fprintf(io->errs, "isarmoured: can't open '%s'\n", f); 476 regfree(&r); 477 return 0; 478 } 479 if (fgets(buf, (int)sizeof(buf), fp) != NULL) { 480 if (regexec(&r, buf, 10, matches, 0) == 0) { 481 armoured = 1; 482 } 483 } 484 (void) fclose(fp); 485 } else { 486 if (regexec(&r, memory, 10, matches, 0) == 0) { 487 armoured = 1; 488 } 489 } 490 regfree(&r); 491 return armoured; 492} 493 494/* vararg print function */ 495static void 496p(FILE *fp, const char *s, ...) 497{ 498 va_list args; 499 500 va_start(args, s); 501 while (s != NULL) { 502 (void) fprintf(fp, "%s", s); 503 s = va_arg(args, char *); 504 } 505 va_end(args); 506} 507 508/* print a JSON object to the FILE stream */ 509static void 510pobj(FILE *fp, mj_t *obj, int depth) 511{ 512 unsigned i; 513 514 if (obj == NULL) { 515 (void) fprintf(stderr, "No object found\n"); 516 return; 517 } 518 for (i = 0 ; i < (unsigned)depth ; i++) { 519 p(fp, " ", NULL); 520 } 521 switch(obj->type) { 522 case MJ_NULL: 523 case MJ_FALSE: 524 case MJ_TRUE: 525 p(fp, (obj->type == MJ_NULL) ? "null" : (obj->type == MJ_FALSE) ? "false" : "true", NULL); 526 break; 527 case MJ_NUMBER: 528 p(fp, obj->value.s, NULL); 529 break; 530 case MJ_STRING: 531 (void) fprintf(fp, "%.*s", (int)(obj->c), obj->value.s); 532 break; 533 case MJ_ARRAY: 534 for (i = 0 ; i < obj->c ; i++) { 535 pobj(fp, &obj->value.v[i], depth + 1); 536 if (i < obj->c - 1) { 537 (void) fprintf(fp, ", "); 538 } 539 } 540 (void) fprintf(fp, "\n"); 541 break; 542 case MJ_OBJECT: 543 for (i = 0 ; i < obj->c ; i += 2) { 544 pobj(fp, &obj->value.v[i], depth + 1); 545 p(fp, ": ", NULL); 546 pobj(fp, &obj->value.v[i + 1], 0); 547 if (i < obj->c - 1) { 548 p(fp, ", ", NULL); 549 } 550 } 551 p(fp, "\n", NULL); 552 break; 553 default: 554 break; 555 } 556} 557 558/* return the time as a string */ 559static char * 560ptimestr(char *dest, size_t size, time_t t) 561{ 562 struct tm *tm; 563 564 tm = gmtime(&t); 565 (void) snprintf(dest, size, "%04d-%02d-%02d", 566 tm->tm_year + 1900, 567 tm->tm_mon + 1, 568 tm->tm_mday); 569 return dest; 570} 571 572/* format a JSON object */ 573static void 574format_json_key(FILE *fp, mj_t *obj, const int psigs) 575{ 576 int64_t birthtime; 577 int64_t duration; 578 time_t now; 579 char tbuf[32]; 580 char *s; 581 mj_t *sub; 582 int i; 583 584 if (pgp_get_debug_level(__FILE__)) { 585 mj_asprint(&s, obj); 586 (void) fprintf(stderr, "formatobj: json is '%s'\n", s); 587 free(s); 588 } 589 if (obj->c == 2 && obj->value.v[1].type == MJ_STRING && 590 strcmp(obj->value.v[1].value.s, "[REVOKED]") == 0) { 591 /* whole key has been rovoked - just return */ 592 return; 593 } 594 pobj(fp, &obj->value.v[mj_object_find(obj, "header", 0, 2) + 1], 0); 595 p(fp, " ", NULL); 596 pobj(fp, &obj->value.v[mj_object_find(obj, "key bits", 0, 2) + 1], 0); 597 p(fp, "/", NULL); 598 pobj(fp, &obj->value.v[mj_object_find(obj, "pka", 0, 2) + 1], 0); 599 p(fp, " ", NULL); 600 pobj(fp, &obj->value.v[mj_object_find(obj, "key id", 0, 2) + 1], 0); 601 birthtime = strtoll(obj->value.v[mj_object_find(obj, "birthtime", 0, 2) + 1].value.s, NULL, 10); 602 p(fp, " ", ptimestr(tbuf, sizeof(tbuf), birthtime), NULL); 603 duration = strtoll(obj->value.v[mj_object_find(obj, "duration", 0, 2) + 1].value.s, NULL, 10); 604 if (duration > 0) { 605 now = time(NULL); 606 p(fp, " ", (birthtime + duration < now) ? "[EXPIRED " : "[EXPIRES ", 607 ptimestr(tbuf, sizeof(tbuf), birthtime + duration), "]", NULL); 608 } 609 p(fp, "\n", "Key fingerprint: ", NULL); 610 pobj(fp, &obj->value.v[mj_object_find(obj, "fingerprint", 0, 2) + 1], 0); 611 p(fp, "\n", NULL); 612 /* go to field after \"duration\" */ 613 for (i = mj_object_find(obj, "duration", 0, 2) + 2; i < mj_arraycount(obj) ; i += 2) { 614 if (strcmp(obj->value.v[i].value.s, "uid") == 0) { 615 sub = &obj->value.v[i + 1]; 616 p(fp, "uid", NULL); 617 pobj(fp, &sub->value.v[0], (psigs) ? 4 : 14); /* human name */ 618 pobj(fp, &sub->value.v[1], 1); /* any revocation */ 619 p(fp, "\n", NULL); 620 } else if (strcmp(obj->value.v[i].value.s, "encryption") == 0) { 621 sub = &obj->value.v[i + 1]; 622 p(fp, "encryption", NULL); 623 pobj(fp, &sub->value.v[0], 1); /* size */ 624 p(fp, "/", NULL); 625 pobj(fp, &sub->value.v[1], 0); /* alg */ 626 p(fp, " ", NULL); 627 pobj(fp, &sub->value.v[2], 0); /* id */ 628 p(fp, " ", ptimestr(tbuf, sizeof(tbuf), strtoll(sub->value.v[3].value.s, NULL, 10)), 629 "\n", NULL); 630 } else if (strcmp(obj->value.v[i].value.s, "sig") == 0) { 631 sub = &obj->value.v[i + 1]; 632 p(fp, "sig", NULL); 633 pobj(fp, &sub->value.v[0], 8); /* size */ 634 p(fp, " ", ptimestr(tbuf, sizeof(tbuf), strtoll(sub->value.v[1].value.s, NULL, 10)), 635 " ", NULL); /* time */ 636 pobj(fp, &sub->value.v[2], 0); /* human name */ 637 p(fp, "\n", NULL); 638 } else { 639 fprintf(stderr, "weird '%s'\n", obj->value.v[i].value.s); 640 pobj(fp, &obj->value.v[i], 0); /* human name */ 641 } 642 } 643 p(fp, "\n", NULL); 644} 645 646/* save a pgp pubkey to a temp file */ 647static int 648savepubkey(char *res, char *f, size_t size) 649{ 650 size_t len; 651 int cc; 652 int wc; 653 int fd; 654 655 (void) snprintf(f, size, "/tmp/pgp2ssh.XXXXXXX"); 656 if ((fd = mkstemp(f)) < 0) { 657 (void) fprintf(stderr, "can't create temp file '%s'\n", f); 658 return 0; 659 } 660 len = strlen(res); 661 for (cc = 0 ; (wc = write(fd, &res[cc], len - cc)) > 0 ; cc += wc) { 662 } 663 (void) close(fd); 664 return 1; 665} 666 667/* format a uint32_t */ 668static int 669formatu32(uint8_t *buffer, uint32_t value) 670{ 671 buffer[0] = (uint8_t)(value >> 24) & 0xff; 672 buffer[1] = (uint8_t)(value >> 16) & 0xff; 673 buffer[2] = (uint8_t)(value >> 8) & 0xff; 674 buffer[3] = (uint8_t)value & 0xff; 675 return sizeof(uint32_t); 676} 677 678/* format a string as (len, string) */ 679static int 680formatstring(char *buffer, const uint8_t *s, size_t len) 681{ 682 int cc; 683 684 cc = formatu32((uint8_t *)buffer, len); 685 (void) memcpy(&buffer[cc], s, len); 686 return cc + len; 687} 688 689/* format a bignum, checking for "interesting" high bit values */ 690static int 691formatbignum(char *buffer, BIGNUM *bn) 692{ 693 size_t len; 694 uint8_t *cp; 695 int cc; 696 697 len = (size_t) BN_num_bytes(bn); 698 if ((cp = calloc(1, len + 1)) == NULL) { 699 (void) fprintf(stderr, "calloc failure in formatbignum\n"); 700 return 0; 701 } 702 (void) BN_bn2bin(bn, cp + 1); 703 cp[0] = 0x0; 704 cc = (cp[1] & 0x80) ? formatstring(buffer, cp, len + 1) : formatstring(buffer, &cp[1], len); 705 free(cp); 706 return cc; 707} 708 709#define MAX_PASSPHRASE_ATTEMPTS 3 710#define INFINITE_ATTEMPTS -1 711 712/* get the passphrase from the user */ 713static int 714find_passphrase(FILE *passfp, const char *id, char *passphrase, size_t size, int attempts) 715{ 716 char prompt[BUFSIZ]; 717 char buf[128]; 718 char *cp; 719 int cc; 720 int i; 721 722 if (passfp) { 723 if (fgets(passphrase, (int)size, passfp) == NULL) { 724 return 0; 725 } 726 return strlen(passphrase); 727 } 728 for (i = 0 ; i < attempts ; i++) { 729 (void) snprintf(prompt, sizeof(prompt), "Enter passphrase for %.16s: ", id); 730 if ((cp = getpass(prompt)) == NULL) { 731 break; 732 } 733 cc = snprintf(buf, sizeof(buf), "%s", cp); 734 (void) snprintf(prompt, sizeof(prompt), "Repeat passphrase for %.16s: ", id); 735 if ((cp = getpass(prompt)) == NULL) { 736 break; 737 } 738 cc = snprintf(passphrase, size, "%s", cp); 739 if (strcmp(buf, passphrase) == 0) { 740 (void) memset(buf, 0x0, sizeof(buf)); 741 return cc; 742 } 743 } 744 (void) memset(buf, 0x0, sizeof(buf)); 745 (void) memset(passphrase, 0x0, size); 746 return 0; 747} 748 749/***************************************************************************/ 750/* exported functions start here */ 751/***************************************************************************/ 752 753/* initialise a netpgp_t structure */ 754int 755netpgp_init(netpgp_t *netpgp) 756{ 757 pgp_io_t *io; 758 time_t t; 759 char id[MAX_ID_LENGTH]; 760 char *homedir; 761 char *userid; 762 char *stream; 763 char *passfd; 764 char *results; 765 int coredumps; 766 int last; 767 768#ifdef HAVE_SYS_RESOURCE_H 769 struct rlimit limit; 770 771 coredumps = netpgp_getvar(netpgp, "coredumps") != NULL; 772 if (!coredumps) { 773 (void) memset(&limit, 0x0, sizeof(limit)); 774 if (setrlimit(RLIMIT_CORE, &limit) != 0) { 775 (void) fprintf(stderr, 776 "netpgp: warning - can't turn off core dumps\n"); 777 coredumps = 1; 778 } 779 } 780#else 781 coredumps = 1; 782#endif 783 if ((io = calloc(1, sizeof(*io))) == NULL) { 784 (void) fprintf(stderr, "netpgp_init: bad alloc\n"); 785 return 0; 786 } 787 io->outs = stdout; 788 if ((stream = netpgp_getvar(netpgp, "outs")) != NULL && 789 strcmp(stream, "<stderr>") == 0) { 790 io->outs = stderr; 791 } 792 io->errs = stderr; 793 if ((stream = netpgp_getvar(netpgp, "errs")) != NULL && 794 strcmp(stream, "<stdout>") == 0) { 795 io->errs = stdout; 796 } 797 if ((results = netpgp_getvar(netpgp, "res")) == NULL) { 798 io->res = io->errs; 799 } else if (strcmp(results, "<stdout>") == 0) { 800 io->res = stdout; 801 } else if (strcmp(results, "<stderr>") == 0) { 802 io->res = stderr; 803 } else { 804 if ((io->res = fopen(results, "w")) == NULL) { 805 (void) fprintf(io->errs, "Can't open results %s for writing\n", 806 results); 807 free(io); 808 return 0; 809 } 810 } 811 netpgp->io = io; 812 if ((passfd = netpgp_getvar(netpgp, "pass-fd")) != NULL && 813 (netpgp->passfp = fdopen(atoi(passfd), "r")) == NULL) { 814 (void) fprintf(io->errs, "Can't open fd %s for reading\n", 815 passfd); 816 return 0; 817 } 818 if (coredumps) { 819 (void) fprintf(io->errs, 820 "netpgp: warning: core dumps enabled\n"); 821 } 822 if ((homedir = netpgp_getvar(netpgp, "homedir")) == NULL) { 823 (void) fprintf(io->errs, "netpgp: bad homedir\n"); 824 return 0; 825 } 826 /* read from either gpg files or ssh keys */ 827 if (netpgp_getvar(netpgp, "ssh keys") == NULL) { 828 if ((userid = netpgp_getvar(netpgp, "userid")) == NULL) { 829 (void) memset(id, 0x0, sizeof(id)); 830 (void) conffile(netpgp, homedir, id, sizeof(id)); 831 if (id[0] != 0x0) { 832 netpgp_setvar(netpgp, "userid", userid = id); 833 } 834 } 835 if (userid == NULL) { 836 if (netpgp_getvar(netpgp, "need userid") != NULL) { 837 (void) fprintf(io->errs, 838 "Cannot find user id\n"); 839 return 0; 840 } 841 } else { 842 (void) netpgp_setvar(netpgp, "userid", userid); 843 } 844 netpgp->pubring = readkeyring(netpgp, "pubring"); 845 if (netpgp->pubring == NULL) { 846 (void) fprintf(io->errs, "Can't read pub keyring\n"); 847 return 0; 848 } 849 netpgp->secring = readkeyring(netpgp, "secring"); 850 if (netpgp->secring == NULL) { 851 (void) fprintf(io->errs, "Can't read sec keyring\n"); 852 return 0; 853 } 854 } else { 855 last = (netpgp->pubring != NULL); 856 if (!readsshkeys(netpgp, homedir, netpgp_getvar(netpgp, "need seckey"))) { 857 (void) fprintf(io->errs, "Can't read ssh keys\n"); 858 return 0; 859 } 860 if ((userid = netpgp_getvar(netpgp, "userid")) == NULL) { 861 set_first_pubring(netpgp->pubring, id, sizeof(id), last); 862 netpgp_setvar(netpgp, "userid", userid = id); 863 } 864 if (userid == NULL) { 865 if (netpgp_getvar(netpgp, "need userid") != NULL) { 866 (void) fprintf(io->errs, 867 "Cannot find user id\n"); 868 return 0; 869 } 870 } else { 871 (void) netpgp_setvar(netpgp, "userid", userid); 872 } 873 } 874 t = time(NULL); 875 netpgp_setvar(netpgp, "initialised", ctime(&t)); 876 return 1; 877} 878 879/* finish off with the netpgp_t struct */ 880int 881netpgp_end(netpgp_t *netpgp) 882{ 883 unsigned i; 884 885 for (i = 0 ; i < netpgp->c ; i++) { 886 if (netpgp->name[i] != NULL) { 887 free(netpgp->name[i]); 888 } 889 if (netpgp->value[i] != NULL) { 890 free(netpgp->value[i]); 891 } 892 } 893 if (netpgp->name != NULL) { 894 free(netpgp->name); 895 } 896 if (netpgp->value != NULL) { 897 free(netpgp->value); 898 } 899 if (netpgp->pubring != NULL) { 900 pgp_keyring_free(netpgp->pubring); 901 } 902 if (netpgp->secring != NULL) { 903 pgp_keyring_free(netpgp->secring); 904 } 905 free(netpgp->io); 906 return 1; 907} 908 909/* list the keys in a keyring */ 910int 911netpgp_list_keys(netpgp_t *netpgp, const int psigs) 912{ 913 if (netpgp->pubring == NULL) { 914 (void) fprintf(stderr, "No keyring\n"); 915 return 0; 916 } 917 return pgp_keyring_list(netpgp->io, netpgp->pubring, psigs); 918} 919 920/* list the keys in a keyring, returning a JSON string */ 921int 922netpgp_list_keys_json(netpgp_t *netpgp, char **json, const int psigs) 923{ 924 mj_t obj; 925 int ret; 926 927 if (netpgp->pubring == NULL) { 928 (void) fprintf(stderr, "No keyring\n"); 929 return 0; 930 } 931 (void) memset(&obj, 0x0, sizeof(obj)); 932 if (!pgp_keyring_json(netpgp->io, netpgp->pubring, &obj, psigs)) { 933 (void) fprintf(stderr, "No keys in keyring\n"); 934 return 0; 935 } 936 ret = mj_asprint(json, &obj); 937 mj_delete(&obj); 938 return ret; 939} 940 941DEFINE_ARRAY(strings_t, char *); 942 943#ifndef HKP_VERSION 944#define HKP_VERSION 1 945#endif 946 947/* find and list some keys in a keyring */ 948int 949netpgp_match_keys(netpgp_t *netpgp, char *name, const char *fmt, void *vp, const int psigs) 950{ 951 const pgp_key_t *key; 952 unsigned k; 953 strings_t pubs; 954 FILE *fp = (FILE *)vp; 955 956 if (name[0] == '0' && name[1] == 'x') { 957 name += 2; 958 } 959 (void) memset(&pubs, 0x0, sizeof(pubs)); 960 k = 0; 961 do { 962 key = pgp_getnextkeybyname(netpgp->io, netpgp->pubring, 963 name, &k); 964 if (key != NULL) { 965 ALLOC(char *, pubs.v, pubs.size, pubs.c, 10, 10, 966 "netpgp_match_keys", return 0); 967 if (strcmp(fmt, "mr") == 0) { 968 pgp_hkp_sprint_keydata(netpgp->io, netpgp->pubring, 969 key, &pubs.v[pubs.c], 970 &key->key.pubkey, psigs); 971 } else { 972 pgp_sprint_keydata(netpgp->io, netpgp->pubring, 973 key, &pubs.v[pubs.c], 974 "signature ", 975 &key->key.pubkey, psigs); 976 } 977 if (pubs.v[pubs.c] != NULL) { 978 pubs.c += 1; 979 } 980 k += 1; 981 } 982 } while (key != NULL); 983 if (strcmp(fmt, "mr") == 0) { 984 (void) fprintf(fp, "info:%d:%d\n", HKP_VERSION, pubs.c); 985 } else { 986 (void) fprintf(fp, "%d key%s found\n", pubs.c, 987 (pubs.c == 1) ? "" : "s"); 988 } 989 for (k = 0 ; k < pubs.c ; k++) { 990 (void) fprintf(fp, "%s%s", pubs.v[k], (k < pubs.c - 1) ? "\n" : ""); 991 free(pubs.v[k]); 992 } 993 free(pubs.v); 994 return pubs.c; 995} 996 997/* find and list some keys in a keyring - return JSON string */ 998int 999netpgp_match_keys_json(netpgp_t *netpgp, char **json, char *name, const char *fmt, const int psigs) 1000{ 1001 const pgp_key_t *key; 1002 unsigned k; 1003 mj_t id_array; 1004 int ret; 1005 1006 if (name[0] == '0' && name[1] == 'x') { 1007 name += 2; 1008 } 1009 (void) memset(&id_array, 0x0, sizeof(id_array)); 1010 k = 0; 1011 *json = NULL; 1012 mj_create(&id_array, "array"); 1013 do { 1014 key = pgp_getnextkeybyname(netpgp->io, netpgp->pubring, 1015 name, &k); 1016 if (key != NULL) { 1017 if (strcmp(fmt, "mr") == 0) { 1018#if 0 1019 pgp_hkp_sprint_keydata(netpgp->io, netpgp->pubring, 1020 key, &pubs.v[pubs.c], 1021 &key->key.pubkey, psigs); 1022#endif 1023 } else { 1024 ALLOC(mj_t, id_array.value.v, id_array.size, 1025 id_array.c, 10, 10, "netpgp_match_keys_json", return 0); 1026 pgp_sprint_mj(netpgp->io, netpgp->pubring, 1027 key, &id_array.value.v[id_array.c++], 1028 "signature ", 1029 &key->key.pubkey, psigs); 1030 } 1031 k += 1; 1032 } 1033 } while (key != NULL); 1034 ret = mj_asprint(json, &id_array); 1035 mj_delete(&id_array); 1036 return ret; 1037} 1038 1039/* find and list some public keys in a keyring */ 1040int 1041netpgp_match_pubkeys(netpgp_t *netpgp, char *name, void *vp) 1042{ 1043 const pgp_key_t *key; 1044 unsigned k; 1045 strings_t pubs; 1046 FILE *fp = (FILE *)vp; 1047 1048 (void) memset(&pubs, 0x0, sizeof(pubs)); 1049 do { 1050 key = pgp_getnextkeybyname(netpgp->io, netpgp->pubring, 1051 name, &k); 1052 if (key != NULL) { 1053 char out[1024 * 64]; 1054 1055 ALLOC(char *, pubs.v, pubs.size, pubs.c, 10, 10, 1056 "netpgp_match_pubkeys", return 0); 1057 (void) pgp_sprint_pubkey(key, out, sizeof(out)); 1058 pubs.v[pubs.c++] = netpgp_strdup(out); 1059 k += 1; 1060 } 1061 } while (key != NULL); 1062 (void) fprintf(fp, "info:%d:%d\n", HKP_VERSION, pubs.c); 1063 for (k = 0 ; k < pubs.c ; k++) { 1064 (void) fprintf(fp, "%s", pubs.v[k]); 1065 free(pubs.v[k]); 1066 } 1067 free(pubs.v); 1068 return pubs.c; 1069} 1070 1071/* find a key in a keyring */ 1072int 1073netpgp_find_key(netpgp_t *netpgp, char *id) 1074{ 1075 pgp_io_t *io; 1076 1077 io = netpgp->io; 1078 if (id == NULL) { 1079 (void) fprintf(io->errs, "NULL id to search for\n"); 1080 return 0; 1081 } 1082 return pgp_getkeybyname(netpgp->io, netpgp->pubring, id) != NULL; 1083} 1084 1085/* get a key in a keyring */ 1086char * 1087netpgp_get_key(netpgp_t *netpgp, const char *name, const char *fmt) 1088{ 1089 const pgp_key_t *key; 1090 char *newkey; 1091 1092 if ((key = resolve_userid(netpgp, netpgp->pubring, name)) == NULL) { 1093 return NULL; 1094 } 1095 if (strcmp(fmt, "mr") == 0) { 1096 return (pgp_hkp_sprint_keydata(netpgp->io, netpgp->pubring, 1097 key, &newkey, 1098 &key->key.pubkey, 1099 netpgp_getvar(netpgp, "subkey sigs") != NULL) > 0) ? newkey : NULL; 1100 } 1101 return (pgp_sprint_keydata(netpgp->io, netpgp->pubring, 1102 key, &newkey, "signature", 1103 &key->key.pubkey, 1104 netpgp_getvar(netpgp, "subkey sigs") != NULL) > 0) ? newkey : NULL; 1105} 1106 1107/* export a given key */ 1108char * 1109netpgp_export_key(netpgp_t *netpgp, char *name) 1110{ 1111 const pgp_key_t *key; 1112 pgp_io_t *io; 1113 1114 io = netpgp->io; 1115 if ((key = resolve_userid(netpgp, netpgp->pubring, name)) == NULL) { 1116 return NULL; 1117 } 1118 return pgp_export_key(io, key, NULL); 1119} 1120 1121#define IMPORT_ARMOR_HEAD "-----BEGIN PGP PUBLIC KEY BLOCK-----" 1122 1123/* import a key into our keyring */ 1124int 1125netpgp_import_key(netpgp_t *netpgp, char *f) 1126{ 1127 pgp_io_t *io; 1128 unsigned realarmor; 1129 int done; 1130 1131 io = netpgp->io; 1132 realarmor = isarmoured(io, f, NULL, IMPORT_ARMOR_HEAD); 1133 done = pgp_keyring_fileread(netpgp->pubring, realarmor, f); 1134 if (!done) { 1135 (void) fprintf(io->errs, "Cannot import key from file %s\n", f); 1136 return 0; 1137 } 1138 return pgp_keyring_list(io, netpgp->pubring, 0); 1139} 1140 1141#define ID_OFFSET 38 1142 1143/* generate a new key */ 1144int 1145netpgp_generate_key(netpgp_t *netpgp, char *id, int numbits) 1146{ 1147 pgp_output_t *create; 1148 const unsigned noarmor = 0; 1149 pgp_key_t *key; 1150 pgp_io_t *io; 1151 uint8_t *uid; 1152 char passphrase[128]; 1153 char newid[1024]; 1154 char filename[MAXPATHLEN]; 1155 char dir[MAXPATHLEN]; 1156 char *cp; 1157 char *ringfile; 1158 char *numtries; 1159 int attempts; 1160 int passc; 1161 int fd; 1162 int cc; 1163 1164 uid = NULL; 1165 io = netpgp->io; 1166 /* generate a new key */ 1167 if (id) { 1168 (void) snprintf(newid, sizeof(newid), "%s", id); 1169 } else { 1170 (void) snprintf(newid, sizeof(newid), 1171 "RSA %d-bit key <%s@localhost>", numbits, getenv("LOGNAME")); 1172 } 1173 uid = (uint8_t *)newid; 1174 key = pgp_rsa_new_selfsign_key(numbits, 65537UL, uid, 1175 netpgp_getvar(netpgp, "hash"), 1176 netpgp_getvar(netpgp, "cipher")); 1177 if (key == NULL) { 1178 (void) fprintf(io->errs, "Cannot generate key\n"); 1179 return 0; 1180 } 1181 cp = NULL; 1182 pgp_sprint_keydata(netpgp->io, NULL, key, &cp, "signature ", &key->key.seckey.pubkey, 0); 1183 (void) fprintf(stdout, "%s", cp); 1184 /* write public key */ 1185 cc = snprintf(dir, sizeof(dir), "%s/%.16s", netpgp_getvar(netpgp, "homedir"), &cp[ID_OFFSET]); 1186 netpgp_setvar(netpgp, "generated userid", &dir[cc - 16]); 1187 if (mkdir(dir, 0700) < 0) { 1188 (void) fprintf(io->errs, "can't mkdir '%s'\n", dir); 1189 return 0; 1190 } 1191 (void) fprintf(io->errs, "netpgp: generated keys in directory %s\n", dir); 1192 (void) snprintf(ringfile = filename, sizeof(filename), "%s/pubring.gpg", dir); 1193 if (!appendkey(io, key, ringfile)) { 1194 (void) fprintf(io->errs, "Cannot write pubkey to '%s'\n", ringfile); 1195 return 0; 1196 } 1197 if (netpgp->pubring != NULL) { 1198 pgp_keyring_free(netpgp->pubring); 1199 } 1200 /* write secret key */ 1201 (void) snprintf(ringfile = filename, sizeof(filename), "%s/secring.gpg", dir); 1202 if ((fd = pgp_setup_file_append(&create, ringfile)) < 0) { 1203 fd = pgp_setup_file_write(&create, ringfile, 0); 1204 } 1205 if (fd < 0) { 1206 (void) fprintf(io->errs, "can't append secring '%s'\n", ringfile); 1207 return 0; 1208 } 1209 /* get the passphrase */ 1210 if ((numtries = netpgp_getvar(netpgp, "numtries")) == NULL || 1211 (attempts = atoi(numtries)) <= 0) { 1212 attempts = MAX_PASSPHRASE_ATTEMPTS; 1213 } else if (strcmp(numtries, "unlimited") == 0) { 1214 attempts = INFINITE_ATTEMPTS; 1215 } 1216 passc = find_passphrase(netpgp->passfp, &cp[ID_OFFSET], passphrase, sizeof(passphrase), attempts); 1217 if (!pgp_write_xfer_seckey(create, key, (uint8_t *)passphrase, (const unsigned)passc, noarmor)) { 1218 (void) fprintf(io->errs, "Cannot write seckey\n"); 1219 return 0; 1220 } 1221 pgp_teardown_file_write(create, fd); 1222 if (netpgp->secring != NULL) { 1223 pgp_keyring_free(netpgp->secring); 1224 } 1225 pgp_keydata_free(key); 1226 free(cp); 1227 return 1; 1228} 1229 1230/* encrypt a file */ 1231int 1232netpgp_encrypt_file(netpgp_t *netpgp, 1233 const char *userid, 1234 const char *f, 1235 char *out, 1236 int armored) 1237{ 1238 const pgp_key_t *key; 1239 const unsigned overwrite = 1; 1240 const char *suffix; 1241 pgp_io_t *io; 1242 char outname[MAXPATHLEN]; 1243 1244 io = netpgp->io; 1245 if (f == NULL) { 1246 (void) fprintf(io->errs, 1247 "netpgp_encrypt_file: no filename specified\n"); 1248 return 0; 1249 } 1250 suffix = (armored) ? ".asc" : ".gpg"; 1251 /* get key with which to sign */ 1252 if ((key = resolve_userid(netpgp, netpgp->pubring, userid)) == NULL) { 1253 return 0; 1254 } 1255 if (out == NULL) { 1256 (void) snprintf(outname, sizeof(outname), "%s%s", f, suffix); 1257 out = outname; 1258 } 1259 return (int)pgp_encrypt_file(io, f, out, key, (unsigned)armored, 1260 overwrite, netpgp_getvar(netpgp, "cipher")); 1261} 1262 1263#define ARMOR_HEAD "-----BEGIN PGP MESSAGE-----" 1264 1265/* decrypt a file */ 1266int 1267netpgp_decrypt_file(netpgp_t *netpgp, const char *f, char *out, int armored) 1268{ 1269 const unsigned overwrite = 1; 1270 pgp_io_t *io; 1271 unsigned realarmor; 1272 unsigned sshkeys; 1273 char *numtries; 1274 int attempts; 1275 1276 __PGP_USED(armored); 1277 io = netpgp->io; 1278 if (f == NULL) { 1279 (void) fprintf(io->errs, 1280 "netpgp_decrypt_file: no filename specified\n"); 1281 return 0; 1282 } 1283 realarmor = isarmoured(io, f, NULL, ARMOR_HEAD); 1284 sshkeys = (unsigned)(netpgp_getvar(netpgp, "ssh keys") != NULL); 1285 if ((numtries = netpgp_getvar(netpgp, "numtries")) == NULL || 1286 (attempts = atoi(numtries)) <= 0) { 1287 attempts = MAX_PASSPHRASE_ATTEMPTS; 1288 } else if (strcmp(numtries, "unlimited") == 0) { 1289 attempts = INFINITE_ATTEMPTS; 1290 } 1291 return pgp_decrypt_file(netpgp->io, f, out, netpgp->secring, 1292 netpgp->pubring, 1293 realarmor, overwrite, sshkeys, 1294 netpgp->passfp, attempts, get_passphrase_cb); 1295} 1296 1297/* sign a file */ 1298int 1299netpgp_sign_file(netpgp_t *netpgp, 1300 const char *userid, 1301 const char *f, 1302 char *out, 1303 int armored, 1304 int cleartext, 1305 int detached) 1306{ 1307 const pgp_key_t *keypair; 1308 const pgp_key_t *pubkey; 1309 const unsigned overwrite = 1; 1310 pgp_seckey_t *seckey; 1311 const char *hashalg; 1312 pgp_io_t *io; 1313 char *numtries; 1314 int attempts; 1315 int ret; 1316 int i; 1317 1318 io = netpgp->io; 1319 if (f == NULL) { 1320 (void) fprintf(io->errs, 1321 "netpgp_sign_file: no filename specified\n"); 1322 return 0; 1323 } 1324 /* get key with which to sign */ 1325 if ((keypair = resolve_userid(netpgp, netpgp->secring, userid)) == NULL) { 1326 return 0; 1327 } 1328 ret = 1; 1329 if ((numtries = netpgp_getvar(netpgp, "numtries")) == NULL || 1330 (attempts = atoi(numtries)) <= 0) { 1331 attempts = MAX_PASSPHRASE_ATTEMPTS; 1332 } else if (strcmp(numtries, "unlimited") == 0) { 1333 attempts = INFINITE_ATTEMPTS; 1334 } 1335 for (i = 0, seckey = NULL ; !seckey && (i < attempts || attempts == INFINITE_ATTEMPTS) ; i++) { 1336 if (netpgp->passfp == NULL) { 1337 /* print out the user id */ 1338 pubkey = pgp_getkeybyname(io, netpgp->pubring, userid); 1339 if (pubkey == NULL) { 1340 (void) fprintf(io->errs, 1341 "netpgp: warning - using pubkey from secring\n"); 1342 pgp_print_keydata(io, netpgp->pubring, keypair, "signature ", 1343 &keypair->key.seckey.pubkey, 0); 1344 } else { 1345 pgp_print_keydata(io, netpgp->pubring, pubkey, "signature ", 1346 &pubkey->key.pubkey, 0); 1347 } 1348 } 1349 if (netpgp_getvar(netpgp, "ssh keys") == NULL) { 1350 /* now decrypt key */ 1351 seckey = pgp_decrypt_seckey(keypair, netpgp->passfp); 1352 if (seckey == NULL) { 1353 (void) fprintf(io->errs, "Bad passphrase\n"); 1354 } 1355 } else { 1356 pgp_keyring_t *secring; 1357 1358 secring = netpgp->secring; 1359 seckey = &secring->keys[0].key.seckey; 1360 } 1361 } 1362 if (seckey == NULL) { 1363 (void) fprintf(io->errs, "Bad passphrase\n"); 1364 return 0; 1365 } 1366 /* sign file */ 1367 hashalg = netpgp_getvar(netpgp, "hash"); 1368 if (seckey->pubkey.alg == PGP_PKA_DSA) { 1369 hashalg = "sha1"; 1370 } 1371 if (detached) { 1372 ret = pgp_sign_detached(io, f, out, seckey, hashalg, 1373 get_birthtime(netpgp_getvar(netpgp, "birthtime")), 1374 get_duration(netpgp_getvar(netpgp, "duration")), 1375 (unsigned)armored, 1376 overwrite); 1377 } else { 1378 ret = pgp_sign_file(io, f, out, seckey, hashalg, 1379 get_birthtime(netpgp_getvar(netpgp, "birthtime")), 1380 get_duration(netpgp_getvar(netpgp, "duration")), 1381 (unsigned)armored, (unsigned)cleartext, 1382 overwrite); 1383 } 1384 pgp_forget(seckey, (unsigned)sizeof(*seckey)); 1385 return ret; 1386} 1387 1388#define ARMOR_SIG_HEAD "-----BEGIN PGP (SIGNATURE|SIGNED MESSAGE)-----" 1389 1390/* verify a file */ 1391int 1392netpgp_verify_file(netpgp_t *netpgp, const char *in, const char *out, int armored) 1393{ 1394 pgp_validation_t result; 1395 pgp_io_t *io; 1396 unsigned realarmor; 1397 1398 __PGP_USED(armored); 1399 (void) memset(&result, 0x0, sizeof(result)); 1400 io = netpgp->io; 1401 if (in == NULL) { 1402 (void) fprintf(io->errs, 1403 "netpgp_verify_file: no filename specified\n"); 1404 return 0; 1405 } 1406 realarmor = isarmoured(io, in, NULL, ARMOR_SIG_HEAD); 1407 if (pgp_validate_file(io, &result, in, out, (const int)realarmor, netpgp->pubring)) { 1408 resultp(io, in, &result, netpgp->pubring); 1409 return 1; 1410 } 1411 if (result.validc + result.invalidc + result.unknownc == 0) { 1412 (void) fprintf(io->errs, 1413 "\"%s\": No signatures found - is this a signed file?\n", 1414 in); 1415 } else if (result.invalidc == 0 && result.unknownc == 0) { 1416 (void) fprintf(io->errs, 1417 "\"%s\": file verification failure: invalid signature time\n", in); 1418 } else { 1419 (void) fprintf(io->errs, 1420"\"%s\": verification failure: %u invalid signatures, %u unknown signatures\n", 1421 in, result.invalidc, result.unknownc); 1422 } 1423 return 0; 1424} 1425 1426/* sign some memory */ 1427int 1428netpgp_sign_memory(netpgp_t *netpgp, 1429 const char *userid, 1430 char *mem, 1431 size_t size, 1432 char *out, 1433 size_t outsize, 1434 const unsigned armored, 1435 const unsigned cleartext) 1436{ 1437 const pgp_key_t *keypair; 1438 const pgp_key_t *pubkey; 1439 pgp_seckey_t *seckey; 1440 pgp_memory_t *signedmem; 1441 const char *hashalg; 1442 pgp_io_t *io; 1443 char *numtries; 1444 int attempts; 1445 int ret; 1446 int i; 1447 1448 io = netpgp->io; 1449 if (mem == NULL) { 1450 (void) fprintf(io->errs, 1451 "netpgp_sign_memory: no memory to sign\n"); 1452 return 0; 1453 } 1454 if ((keypair = resolve_userid(netpgp, netpgp->secring, userid)) == NULL) { 1455 return 0; 1456 } 1457 ret = 1; 1458 if ((numtries = netpgp_getvar(netpgp, "numtries")) == NULL || 1459 (attempts = atoi(numtries)) <= 0) { 1460 attempts = MAX_PASSPHRASE_ATTEMPTS; 1461 } else if (strcmp(numtries, "unlimited") == 0) { 1462 attempts = INFINITE_ATTEMPTS; 1463 } 1464 for (i = 0, seckey = NULL ; !seckey && (i < attempts || attempts == INFINITE_ATTEMPTS) ; i++) { 1465 if (netpgp->passfp == NULL) { 1466 /* print out the user id */ 1467 pubkey = pgp_getkeybyname(io, netpgp->pubring, userid); 1468 if (pubkey == NULL) { 1469 (void) fprintf(io->errs, 1470 "netpgp: warning - using pubkey from secring\n"); 1471 pgp_print_keydata(io, netpgp->pubring, keypair, "signature ", 1472 &keypair->key.seckey.pubkey, 0); 1473 } else { 1474 pgp_print_keydata(io, netpgp->pubring, pubkey, "signature ", 1475 &pubkey->key.pubkey, 0); 1476 } 1477 } 1478 /* now decrypt key */ 1479 seckey = pgp_decrypt_seckey(keypair, netpgp->passfp); 1480 if (seckey == NULL) { 1481 (void) fprintf(io->errs, "Bad passphrase\n"); 1482 } 1483 } 1484 if (seckey == NULL) { 1485 (void) fprintf(io->errs, "Bad passphrase\n"); 1486 return 0; 1487 } 1488 /* sign file */ 1489 (void) memset(out, 0x0, outsize); 1490 hashalg = netpgp_getvar(netpgp, "hash"); 1491 if (seckey->pubkey.alg == PGP_PKA_DSA) { 1492 hashalg = "sha1"; 1493 } 1494 signedmem = pgp_sign_buf(io, mem, size, seckey, 1495 get_birthtime(netpgp_getvar(netpgp, "birthtime")), 1496 get_duration(netpgp_getvar(netpgp, "duration")), 1497 hashalg, armored, cleartext); 1498 if (signedmem) { 1499 size_t m; 1500 1501 m = MIN(pgp_mem_len(signedmem), outsize); 1502 (void) memcpy(out, pgp_mem_data(signedmem), m); 1503 pgp_memory_free(signedmem); 1504 ret = (int)m; 1505 } else { 1506 ret = 0; 1507 } 1508 pgp_forget(seckey, (unsigned)sizeof(*seckey)); 1509 return ret; 1510} 1511 1512/* verify memory */ 1513int 1514netpgp_verify_memory(netpgp_t *netpgp, const void *in, const size_t size, 1515 void *out, size_t outsize, const int armored) 1516{ 1517 pgp_validation_t result; 1518 pgp_memory_t *signedmem; 1519 pgp_memory_t *cat; 1520 pgp_io_t *io; 1521 size_t m; 1522 int ret; 1523 1524 (void) memset(&result, 0x0, sizeof(result)); 1525 io = netpgp->io; 1526 if (in == NULL) { 1527 (void) fprintf(io->errs, 1528 "netpgp_verify_memory: no memory to verify\n"); 1529 return 0; 1530 } 1531 signedmem = pgp_memory_new(); 1532 pgp_memory_add(signedmem, in, size); 1533 if (out) { 1534 cat = pgp_memory_new(); 1535 } 1536 ret = pgp_validate_mem(io, &result, signedmem, 1537 (out) ? &cat : NULL, 1538 armored, netpgp->pubring); 1539 pgp_memory_free(signedmem); 1540 if (ret) { 1541 resultp(io, "<stdin>", &result, netpgp->pubring); 1542 if (out) { 1543 m = MIN(pgp_mem_len(cat), outsize); 1544 (void) memcpy(out, pgp_mem_data(cat), m); 1545 pgp_memory_free(cat); 1546 } else { 1547 m = 1; 1548 } 1549 return (int)m; 1550 } 1551 if (result.validc + result.invalidc + result.unknownc == 0) { 1552 (void) fprintf(io->errs, 1553 "No signatures found - is this memory signed?\n"); 1554 } else if (result.invalidc == 0 && result.unknownc == 0) { 1555 (void) fprintf(io->errs, 1556 "memory verification failure: invalid signature time\n"); 1557 } else { 1558 (void) fprintf(io->errs, 1559"memory verification failure: %u invalid signatures, %u unknown signatures\n", 1560 result.invalidc, result.unknownc); 1561 } 1562 return 0; 1563} 1564 1565/* encrypt some memory */ 1566int 1567netpgp_encrypt_memory(netpgp_t *netpgp, 1568 const char *userid, 1569 void *in, 1570 const size_t insize, 1571 char *out, 1572 size_t outsize, 1573 int armored) 1574{ 1575 const pgp_key_t *keypair; 1576 pgp_memory_t *enc; 1577 pgp_io_t *io; 1578 size_t m; 1579 1580 io = netpgp->io; 1581 if (in == NULL) { 1582 (void) fprintf(io->errs, 1583 "netpgp_encrypt_buf: no memory to encrypt\n"); 1584 return 0; 1585 } 1586 if ((keypair = resolve_userid(netpgp, netpgp->pubring, userid)) == NULL) { 1587 return 0; 1588 } 1589 if (in == out) { 1590 (void) fprintf(io->errs, 1591 "netpgp_encrypt_buf: input and output bufs need to be different\n"); 1592 return 0; 1593 } 1594 if (outsize < insize) { 1595 (void) fprintf(io->errs, 1596 "netpgp_encrypt_buf: input size is larger than output size\n"); 1597 return 0; 1598 } 1599 enc = pgp_encrypt_buf(io, in, insize, keypair, (unsigned)armored, 1600 netpgp_getvar(netpgp, "cipher")); 1601 m = MIN(pgp_mem_len(enc), outsize); 1602 (void) memcpy(out, pgp_mem_data(enc), m); 1603 pgp_memory_free(enc); 1604 return (int)m; 1605} 1606 1607/* decrypt a chunk of memory */ 1608int 1609netpgp_decrypt_memory(netpgp_t *netpgp, const void *input, const size_t insize, 1610 char *out, size_t outsize, const int armored) 1611{ 1612 pgp_memory_t *mem; 1613 pgp_io_t *io; 1614 unsigned realarmour; 1615 unsigned sshkeys; 1616 size_t m; 1617 char *numtries; 1618 int attempts; 1619 1620 __PGP_USED(armored); 1621 io = netpgp->io; 1622 if (input == NULL) { 1623 (void) fprintf(io->errs, 1624 "netpgp_decrypt_memory: no memory\n"); 1625 return 0; 1626 } 1627 realarmour = isarmoured(io, NULL, input, ARMOR_HEAD); 1628 sshkeys = (unsigned)(netpgp_getvar(netpgp, "ssh keys") != NULL); 1629 if ((numtries = netpgp_getvar(netpgp, "numtries")) == NULL || 1630 (attempts = atoi(numtries)) <= 0) { 1631 attempts = MAX_PASSPHRASE_ATTEMPTS; 1632 } else if (strcmp(numtries, "unlimited") == 0) { 1633 attempts = INFINITE_ATTEMPTS; 1634 } 1635 mem = pgp_decrypt_buf(netpgp->io, input, insize, netpgp->secring, 1636 netpgp->pubring, 1637 realarmour, sshkeys, 1638 netpgp->passfp, 1639 attempts, 1640 get_passphrase_cb); 1641 if (mem == NULL) { 1642 return -1; 1643 } 1644 m = MIN(pgp_mem_len(mem), outsize); 1645 (void) memcpy(out, pgp_mem_data(mem), m); 1646 pgp_memory_free(mem); 1647 return (int)m; 1648} 1649 1650/* wrappers for the ops_debug_level functions we added to openpgpsdk */ 1651 1652/* set the debugging level per filename */ 1653int 1654netpgp_set_debug(const char *f) 1655{ 1656 return pgp_set_debug_level(f); 1657} 1658 1659/* get the debugging level per filename */ 1660int 1661netpgp_get_debug(const char *f) 1662{ 1663 return pgp_get_debug_level(f); 1664} 1665 1666/* return the version for the library */ 1667const char * 1668netpgp_get_info(const char *type) 1669{ 1670 return pgp_get_info(type); 1671} 1672 1673/* list all the packets in a file */ 1674int 1675netpgp_list_packets(netpgp_t *netpgp, char *f, int armor, char *pubringname) 1676{ 1677 pgp_keyring_t *keyring; 1678 const unsigned noarmor = 0; 1679 struct stat st; 1680 pgp_io_t *io; 1681 char ringname[MAXPATHLEN]; 1682 char *homedir; 1683 int ret; 1684 1685 io = netpgp->io; 1686 if (f == NULL) { 1687 (void) fprintf(io->errs, "No file containing packets\n"); 1688 return 0; 1689 } 1690 if (stat(f, &st) < 0) { 1691 (void) fprintf(io->errs, "No such file '%s'\n", f); 1692 return 0; 1693 } 1694 homedir = netpgp_getvar(netpgp, "homedir"); 1695 if (pubringname == NULL) { 1696 (void) snprintf(ringname, sizeof(ringname), 1697 "%s/pubring.gpg", homedir); 1698 pubringname = ringname; 1699 } 1700 if ((keyring = calloc(1, sizeof(*keyring))) == NULL) { 1701 (void) fprintf(io->errs, "netpgp_list_packets: bad alloc\n"); 1702 return 0; 1703 } 1704 if (!pgp_keyring_fileread(keyring, noarmor, pubringname)) { 1705 free(keyring); 1706 (void) fprintf(io->errs, "Cannot read pub keyring %s\n", 1707 pubringname); 1708 return 0; 1709 } 1710 netpgp->pubring = keyring; 1711 netpgp_setvar(netpgp, "pubring", pubringname); 1712 ret = pgp_list_packets(io, f, (unsigned)armor, 1713 netpgp->secring, 1714 netpgp->pubring, 1715 netpgp->passfp, 1716 get_passphrase_cb); 1717 free(keyring); 1718 return ret; 1719} 1720 1721/* set a variable */ 1722int 1723netpgp_setvar(netpgp_t *netpgp, const char *name, const char *value) 1724{ 1725 char *newval; 1726 int i; 1727 1728 /* protect against the case where 'value' is netpgp->value[i] */ 1729 newval = netpgp_strdup(value); 1730 if ((i = findvar(netpgp, name)) < 0) { 1731 /* add the element to the array */ 1732 if (size_arrays(netpgp, netpgp->size + 15)) { 1733 netpgp->name[i = netpgp->c++] = netpgp_strdup(name); 1734 } 1735 } else { 1736 /* replace the element in the array */ 1737 if (netpgp->value[i]) { 1738 free(netpgp->value[i]); 1739 netpgp->value[i] = NULL; 1740 } 1741 } 1742 /* sanity checks for range of values */ 1743 if (strcmp(name, "hash") == 0 || strcmp(name, "algorithm") == 0) { 1744 if (pgp_str_to_hash_alg(newval) == PGP_HASH_UNKNOWN) { 1745 free(newval); 1746 return 0; 1747 } 1748 } 1749 netpgp->value[i] = newval; 1750 return 1; 1751} 1752 1753/* unset a variable */ 1754int 1755netpgp_unsetvar(netpgp_t *netpgp, const char *name) 1756{ 1757 int i; 1758 1759 if ((i = findvar(netpgp, name)) >= 0) { 1760 if (netpgp->value[i]) { 1761 free(netpgp->value[i]); 1762 netpgp->value[i] = NULL; 1763 } 1764 netpgp->value[i] = NULL; 1765 return 1; 1766 } 1767 return 0; 1768} 1769 1770/* get a variable's value (NULL if not set) */ 1771char * 1772netpgp_getvar(netpgp_t *netpgp, const char *name) 1773{ 1774 int i; 1775 1776 return ((i = findvar(netpgp, name)) < 0) ? NULL : netpgp->value[i]; 1777} 1778 1779/* increment a value */ 1780int 1781netpgp_incvar(netpgp_t *netpgp, const char *name, const int delta) 1782{ 1783 char *cp; 1784 char num[16]; 1785 int val; 1786 1787 val = 0; 1788 if ((cp = netpgp_getvar(netpgp, name)) != NULL) { 1789 val = atoi(cp); 1790 } 1791 (void) snprintf(num, sizeof(num), "%d", val + delta); 1792 netpgp_setvar(netpgp, name, num); 1793 return 1; 1794} 1795 1796/* set the home directory value to "home/subdir" */ 1797int 1798netpgp_set_homedir(netpgp_t *netpgp, char *home, const char *subdir, const int quiet) 1799{ 1800 struct stat st; 1801 char d[MAXPATHLEN]; 1802 1803 if (home == NULL) { 1804 if (!quiet) { 1805 (void) fprintf(stderr, "NULL HOME directory\n"); 1806 } 1807 return 0; 1808 } 1809 (void) snprintf(d, sizeof(d), "%s%s", home, (subdir) ? subdir : ""); 1810 if (stat(d, &st) == 0) { 1811 if ((st.st_mode & S_IFMT) == S_IFDIR) { 1812 netpgp_setvar(netpgp, "homedir", d); 1813 return 1; 1814 } 1815 (void) fprintf(stderr, "netpgp: homedir \"%s\" is not a dir\n", 1816 d); 1817 return 0; 1818 } 1819 if (!quiet) { 1820 (void) fprintf(stderr, 1821 "netpgp: warning homedir \"%s\" not found\n", d); 1822 } 1823 netpgp_setvar(netpgp, "homedir", d); 1824 return 1; 1825} 1826 1827/* validate all sigs in the pub keyring */ 1828int 1829netpgp_validate_sigs(netpgp_t *netpgp) 1830{ 1831 pgp_validation_t result; 1832 1833 return (int)pgp_validate_all_sigs(&result, netpgp->pubring, NULL); 1834} 1835 1836/* print the json out on 'fp' */ 1837int 1838netpgp_format_json(void *vp, const char *json, const int psigs) 1839{ 1840 mj_t ids; 1841 FILE *fp; 1842 int from; 1843 int idc; 1844 int tok; 1845 int to; 1846 int i; 1847 1848 if ((fp = (FILE *)vp) == NULL || json == NULL) { 1849 return 0; 1850 } 1851 /* ids is an array of strings, each containing 1 entry */ 1852 (void) memset(&ids, 0x0, sizeof(ids)); 1853 from = to = tok = 0; 1854 /* convert from string into an mj structure */ 1855 (void) mj_parse(&ids, json, &from, &to, &tok); 1856 if ((idc = mj_arraycount(&ids)) == 1 && strchr(json, '{') == NULL) { 1857 idc = 0; 1858 } 1859 (void) fprintf(fp, "%d key%s found\n", idc, (idc == 1) ? "" : "s"); 1860 for (i = 0 ; i < idc ; i++) { 1861 format_json_key(fp, &ids.value.v[i], psigs); 1862 } 1863 /* clean up */ 1864 mj_delete(&ids); 1865 return idc; 1866} 1867 1868/* find a key in keyring, and write it in ssh format */ 1869int 1870netpgp_write_sshkey(netpgp_t *netpgp, char *s, const char *userid, char *out, size_t size) 1871{ 1872 const pgp_key_t *key; 1873 pgp_keyring_t *keyring; 1874 pgp_io_t *io; 1875 unsigned k; 1876 size_t cc; 1877 char f[MAXPATHLEN]; 1878 1879 if ((io = calloc(1, sizeof(pgp_io_t))) == NULL) { 1880 (void) fprintf(stderr, "netpgp_save_sshpub: bad alloc 1\n"); 1881 return 0; 1882 } 1883 io->outs = stdout; 1884 io->errs = stderr; 1885 io->res = stderr; 1886 netpgp->io = io; 1887 /* write new to temp file */ 1888 savepubkey(s, f, sizeof(f)); 1889 if ((keyring = calloc(1, sizeof(*keyring))) == NULL) { 1890 (void) fprintf(stderr, "netpgp_save_sshpub: bad alloc 2\n"); 1891 return 0; 1892 } 1893 if (!pgp_keyring_fileread(netpgp->pubring = keyring, 1, f)) { 1894 (void) fprintf(stderr, "can't import key\n"); 1895 return 0; 1896 } 1897 /* get rsa key */ 1898 k = 0; 1899 key = pgp_getnextkeybyname(netpgp->io, netpgp->pubring, userid, &k); 1900 if (key == NULL) { 1901 (void) fprintf(stderr, "no key found for '%s'\n", userid); 1902 return 0; 1903 } 1904 if (key->key.pubkey.alg != PGP_PKA_RSA) { 1905 /* we're not interested in supporting DSA either :-) */ 1906 (void) fprintf(stderr, "key not RSA '%s'\n", userid); 1907 return 0; 1908 } 1909 /* XXX - check trust sigs */ 1910 /* XXX - check expiry */ 1911 /* XXX - check start */ 1912 /* XXX - check not weak key */ 1913 /* get rsa e and n */ 1914 (void) memset(out, 0x0, size); 1915 cc = formatstring((char *)out, (const uint8_t *)"ssh-rsa", 7); 1916 cc += formatbignum((char *)&out[cc], key->key.pubkey.key.rsa.e); 1917 cc += formatbignum((char *)&out[cc], key->key.pubkey.key.rsa.n); 1918 free(io); 1919 free(keyring); 1920 return cc; 1921} 1922