| 1 |
/* Mixmaster version 3 -- (C) 1999 Anonymizer Inc.
|
| 2 |
|
| 3 |
Mixmaster may be redistributed and modified under certain conditions.
|
| 4 |
This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF
|
| 5 |
ANY KIND, either express or implied. See the file COPYRIGHT for
|
| 6 |
details.
|
| 7 |
|
| 8 |
OpenPGP messages
|
| 9 |
$Id: pgp.c,v 1.7 2002/08/25 13:27:40 weaselp Exp $ */
|
| 10 |
|
| 11 |
|
| 12 |
#include "mix3.h"
|
| 13 |
#ifdef USE_PGP
|
| 14 |
#include "pgp.h"
|
| 15 |
#include <ctype.h>
|
| 16 |
#include <string.h>
|
| 17 |
|
| 18 |
int pgp_decrypt(BUFFER *in, BUFFER *pass, BUFFER *sig, char *pubring,
|
| 19 |
char *secring)
|
| 20 |
{
|
| 21 |
BUFFER *key;
|
| 22 |
int err;
|
| 23 |
|
| 24 |
key = buf_new();
|
| 25 |
if (pass)
|
| 26 |
buf_set(key, pass);
|
| 27 |
if (!pgp_ispacket(in))
|
| 28 |
pgp_dearmor(in, in);
|
| 29 |
err = pgp_getmsg(in, key, sig, pubring, secring);
|
| 30 |
buf_free(key);
|
| 31 |
return (err);
|
| 32 |
}
|
| 33 |
|
| 34 |
static void appendaddr(BUFFER *to, BUFFER *addr)
|
| 35 |
{
|
| 36 |
if (bufifind(addr, "<")) {
|
| 37 |
for (addr->ptr = 0; addr->ptr < addr->length; addr->ptr++)
|
| 38 |
if (addr->data[addr->ptr] == '<') {
|
| 39 |
buf_rest(to, addr);
|
| 40 |
break;
|
| 41 |
}
|
| 42 |
} else {
|
| 43 |
buf_appendc(to, '<');
|
| 44 |
buf_cat(to, addr);
|
| 45 |
buf_appendc(to, '>');
|
| 46 |
}
|
| 47 |
buf_nl(to);
|
| 48 |
buf_clear(addr);
|
| 49 |
}
|
| 50 |
|
| 51 |
int pgp_mailenc(int mode, BUFFER *msg, char *sigid,
|
| 52 |
BUFFER *pass, char *pubring, char *secring)
|
| 53 |
{
|
| 54 |
BUFFER *hdr, *body, *line, *uid, *field, *content;
|
| 55 |
int err = -1;
|
| 56 |
|
| 57 |
hdr = buf_new();
|
| 58 |
body = buf_new();
|
| 59 |
line = buf_new();
|
| 60 |
uid = buf_new();
|
| 61 |
field = buf_new();
|
| 62 |
content = buf_new();
|
| 63 |
|
| 64 |
buf_appendc(uid, '<');
|
| 65 |
buf_appends(uid, sigid);
|
| 66 |
if (sigid[strlen(sigid) - 1] != '@')
|
| 67 |
buf_appendc(uid, '>');
|
| 68 |
|
| 69 |
while (buf_getline(msg, line) == 0)
|
| 70 |
buf_cat(hdr, line), buf_nl(hdr);
|
| 71 |
|
| 72 |
if ((mode & PGP_SIGN) && !(mode & PGP_ENCRYPT))
|
| 73 |
while (buf_getheader(hdr, field, content) == 0)
|
| 74 |
if (bufileft(field, "content-") || bufieq(field, "mime-version")) {
|
| 75 |
/* Is MIME message */
|
| 76 |
err = pgpmime_sign(msg, uid, pass, secring);
|
| 77 |
goto end;
|
| 78 |
}
|
| 79 |
|
| 80 |
buf_rest(body, msg);
|
| 81 |
|
| 82 |
if ((mode & PGP_SIGN) && !(mode & PGP_ENCRYPT)) {
|
| 83 |
err = pgp_signtxt(body, uid, pass, secring, mode & PGP_REMAIL);
|
| 84 |
}
|
| 85 |
|
| 86 |
if (mode & PGP_ENCRYPT) {
|
| 87 |
BUFFER *plainhdr, *encrhdr, *to, *addr;
|
| 88 |
int encapsulate = 0;
|
| 89 |
|
| 90 |
plainhdr = buf_new();
|
| 91 |
encrhdr = buf_new();
|
| 92 |
to = buf_new();
|
| 93 |
addr = buf_new();
|
| 94 |
while (buf_getheader(hdr, field, content) == 0) {
|
| 95 |
if (bufieq(field, "to") || bufieq(field, "cc") || bufieq(field, "bcc")) {
|
| 96 |
buf_appendheader(plainhdr, field, content);
|
| 97 |
rfc822_addr(content, addr);
|
| 98 |
while (buf_getline(addr, content) != -1)
|
| 99 |
appendaddr(to, content);
|
| 100 |
} else
|
| 101 |
buf_appendheader(encrhdr, field, content);
|
| 102 |
}
|
| 103 |
#if 1
|
| 104 |
/* encrypt the headers */
|
| 105 |
buf_appends(plainhdr, "Subject: PGP encrypted message\n");
|
| 106 |
if (encrhdr->length) {
|
| 107 |
buf_nl(encrhdr);
|
| 108 |
buf_cat(encrhdr, body);
|
| 109 |
buf_move(body, encrhdr);
|
| 110 |
encapsulate = 1;
|
| 111 |
}
|
| 112 |
#else
|
| 113 |
/* send headers as plain text */
|
| 114 |
buf_cat(plainhdr, encrhdr);
|
| 115 |
#endif
|
| 116 |
buf_move(hdr, plainhdr);
|
| 117 |
|
| 118 |
buf_clear(line);
|
| 119 |
if (encapsulate)
|
| 120 |
buf_sets(line, "Content-Type: message/rfc822\n");
|
| 121 |
else if (strlen(DEFLTENTITY))
|
| 122 |
buf_setf(line, "Content-Type: %s\n", DEFLTENTITY);
|
| 123 |
buf_nl(line);
|
| 124 |
buf_cat(line, body);
|
| 125 |
buf_move(body, line);
|
| 126 |
|
| 127 |
/* Use the user keyring if pubring == NULL */
|
| 128 |
err = pgp_encrypt(mode, body, to, uid, pass,
|
| 129 |
pubring ? pubring : PGPPUBRING, secring);
|
| 130 |
buf_free(plainhdr);
|
| 131 |
buf_free(encrhdr);
|
| 132 |
buf_free(to);
|
| 133 |
buf_free(addr);
|
| 134 |
}
|
| 135 |
if (err == 0) {
|
| 136 |
if (mode & PGP_ENCRYPT) {
|
| 137 |
#if 1
|
| 138 |
buf_sets(field, "+--");
|
| 139 |
#else
|
| 140 |
buf_setrnd(mboundary, 18);
|
| 141 |
encode(mboundary, 0);
|
| 142 |
#endif
|
| 143 |
|
| 144 |
buf_appendf(hdr,
|
| 145 |
"Content-Type: multipart/encrypted; boundary=\"%b\"; "
|
| 146 |
"protocol=\"application/pgp-encrypted\"\n\n"
|
| 147 |
"--%b\n"
|
| 148 |
"Content-Type: application/pgp-encrypted\n\n"
|
| 149 |
"Version: 1\n\n"
|
| 150 |
"--%b\n"
|
| 151 |
"Content-Type: application/octet-stream\n",
|
| 152 |
field, field, field);
|
| 153 |
buf_appendf(body, "\n--%b--\n", field);
|
| 154 |
}
|
| 155 |
buf_move(msg, hdr);
|
| 156 |
buf_nl(msg);
|
| 157 |
buf_cat(msg, body);
|
| 158 |
}
|
| 159 |
end:
|
| 160 |
buf_free(hdr);
|
| 161 |
buf_free(body);
|
| 162 |
buf_free(line);
|
| 163 |
buf_free(uid);
|
| 164 |
buf_free(field);
|
| 165 |
buf_free(content);
|
| 166 |
return (err);
|
| 167 |
}
|
| 168 |
|
| 169 |
static void pgp_setkey(BUFFER *key, int algo)
|
| 170 |
{
|
| 171 |
buf_setc(key, algo);
|
| 172 |
buf_appendrnd(key, pgp_keylen(algo));
|
| 173 |
}
|
| 174 |
|
| 175 |
int pgp_encrypt(int mode, BUFFER *in, BUFFER *to, BUFFER *sigid,
|
| 176 |
BUFFER *pass, char *pubring, char *secring)
|
| 177 |
{
|
| 178 |
BUFFER *dek, *out, *sig, *dest, *tmp;
|
| 179 |
int err = 0, sym = 0, mdc = 0;
|
| 180 |
int text;
|
| 181 |
|
| 182 |
out = buf_new();
|
| 183 |
tmp = buf_new();
|
| 184 |
dek = buf_new();
|
| 185 |
sig = buf_new();
|
| 186 |
dest = buf_new();
|
| 187 |
|
| 188 |
text = mode & PGP_TEXT ? 1 : 0;
|
| 189 |
|
| 190 |
if (mode & (PGP_CONV3DES | PGP_CONVCAST))
|
| 191 |
mode |= PGP_NCONVENTIONAL;
|
| 192 |
|
| 193 |
if (mode & PGP_SIGN) {
|
| 194 |
err = pgp_sign(in, NULL, sig, sigid, pass, text, 0, 0,
|
| 195 |
mode & PGP_REMAIL ? 1 : 0, NULL, secring);
|
| 196 |
if (err < 0)
|
| 197 |
goto end;
|
| 198 |
if (mode & PGP_DETACHEDSIG) {
|
| 199 |
buf_move(in, sig);
|
| 200 |
if (!(mode & PGP_NOARMOR))
|
| 201 |
pgp_armor(in, PGP_ARMOR_NYMSIG);
|
| 202 |
goto end;
|
| 203 |
}
|
| 204 |
}
|
| 205 |
if (mode & PGP_ENCRYPT) {
|
| 206 |
err = buf_getline(to, dest);
|
| 207 |
if (err == -1)
|
| 208 |
goto end;
|
| 209 |
if (to->ptr == to->length) {
|
| 210 |
if ((err = pgpdb_getkey(PK_ENCRYPT, PGP_ANY, &sym, &mdc, NULL, dest, NULL,
|
| 211 |
NULL, pubring, NULL)) < 0)
|
| 212 |
goto end;
|
| 213 |
pgp_setkey(dek, sym);
|
| 214 |
err = pgp_sessionkey(out, dest, NULL, dek, pubring);
|
| 215 |
#ifdef USE_IDEA
|
| 216 |
if (err < 0 && dek->data[0] == PGP_K_IDEA) {
|
| 217 |
pgp_setkey(dek, PGP_K_3DES);
|
| 218 |
err = pgp_sessionkey(out, dest, NULL, dek, pubring);
|
| 219 |
}
|
| 220 |
#endif
|
| 221 |
} else {
|
| 222 |
/* multiple recipients */
|
| 223 |
pgp_setkey(dek, PGP_K_3DES);
|
| 224 |
buf_rewind(to);
|
| 225 |
while (buf_getline(to, dest) != -1)
|
| 226 |
if (dest->length) {
|
| 227 |
err = pgp_sessionkey(tmp, dest, NULL, dek, pubring);
|
| 228 |
#ifdef USE_IDEA
|
| 229 |
if (err < 0 && dek->data[0] != PGP_K_IDEA) {
|
| 230 |
buf_rewind(to);
|
| 231 |
buf_clear(out);
|
| 232 |
pgp_setkey(dek, PGP_K_IDEA);
|
| 233 |
continue;
|
| 234 |
}
|
| 235 |
#endif
|
| 236 |
if (err < 0)
|
| 237 |
goto end;
|
| 238 |
buf_cat(out, tmp);
|
| 239 |
}
|
| 240 |
}
|
| 241 |
} else if (mode & PGP_NCONVENTIONAL) {
|
| 242 |
/* genereate DEK in pgp_symsessionkey */
|
| 243 |
buf_setc(dek, mode & PGP_CONVCAST ? PGP_K_CAST5 : PGP_K_3DES);
|
| 244 |
pgp_marker(out);
|
| 245 |
err = pgp_symsessionkey(tmp, dek, to);
|
| 246 |
buf_cat(out, tmp);
|
| 247 |
} else if (mode & PGP_CONVENTIONAL) {
|
| 248 |
digest_md5(to, tmp);
|
| 249 |
buf_setc(dek, PGP_K_IDEA);
|
| 250 |
buf_cat(dek, tmp);
|
| 251 |
}
|
| 252 |
|
| 253 |
pgp_literal(in, NULL, text);
|
| 254 |
if (sig->length) {
|
| 255 |
buf_cat(sig, in);
|
| 256 |
buf_move(in, sig);
|
| 257 |
}
|
| 258 |
pgp_compress(in);
|
| 259 |
if (mode & (PGP_ENCRYPT | PGP_CONVENTIONAL | PGP_NCONVENTIONAL))
|
| 260 |
pgp_symmetric(in, dek, mdc);
|
| 261 |
if (mode & (PGP_ENCRYPT | PGP_NCONVENTIONAL)) {
|
| 262 |
buf_cat(out, in);
|
| 263 |
buf_move(in, out);
|
| 264 |
}
|
| 265 |
if (!(mode & PGP_NOARMOR))
|
| 266 |
pgp_armor(in, (mode & PGP_REMAIL) ? PGP_ARMOR_REM : PGP_ARMOR_NORMAL);
|
| 267 |
|
| 268 |
end:
|
| 269 |
buf_free(out);
|
| 270 |
buf_free(tmp);
|
| 271 |
buf_free(dek);
|
| 272 |
buf_free(sig);
|
| 273 |
buf_free(dest);
|
| 274 |
return (err);
|
| 275 |
}
|
| 276 |
|
| 277 |
/* ASCII armor */
|
| 278 |
|
| 279 |
int pgp_dearmor(BUFFER *in, BUFFER *out)
|
| 280 |
{
|
| 281 |
BUFFER *line, *temp;
|
| 282 |
int err = 0;
|
| 283 |
int tempbuf = 0;
|
| 284 |
|
| 285 |
line = buf_new();
|
| 286 |
temp = buf_new();
|
| 287 |
|
| 288 |
if (in == out) {
|
| 289 |
out = buf_new();
|
| 290 |
tempbuf = 1;
|
| 291 |
}
|
| 292 |
do
|
| 293 |
if (buf_getline(in, line) == -1) {
|
| 294 |
err = -1;
|
| 295 |
goto end;
|
| 296 |
}
|
| 297 |
while (!bufleft(line, begin_pgp)) ;
|
| 298 |
|
| 299 |
while (buf_getheader(in, temp, line) == 0) ; /* scan for empty line */
|
| 300 |
|
| 301 |
err = decode(in, out);
|
| 302 |
err = buf_getline(in, line);
|
| 303 |
if (line->length == 5 && line->data[0] == '=') /* skip CRC */
|
| 304 |
err = buf_getline(in, line);
|
| 305 |
if (err == 0 && bufleft(line, end_pgp))
|
| 306 |
err = 0;
|
| 307 |
else
|
| 308 |
err = -1;
|
| 309 |
|
| 310 |
end:
|
| 311 |
buf_free(temp);
|
| 312 |
buf_free(line);
|
| 313 |
|
| 314 |
if (tempbuf) {
|
| 315 |
buf_move(in, out);
|
| 316 |
buf_free(out);
|
| 317 |
}
|
| 318 |
return (err);
|
| 319 |
}
|
| 320 |
|
| 321 |
#define POLY 0X1864CFB
|
| 322 |
|
| 323 |
int pgp_armor(BUFFER *in, int mode)
|
| 324 |
|
| 325 |
/* mode = 1: remailer message
|
| 326 |
* 0: normal message,
|
| 327 |
* 2: key
|
| 328 |
* 3: nym key
|
| 329 |
* 4: nym signature
|
| 330 |
*/
|
| 331 |
|
| 332 |
{
|
| 333 |
BUFFER *out;
|
| 334 |
unsigned long crc = 0xB704CE;
|
| 335 |
long p;
|
| 336 |
int i;
|
| 337 |
|
| 338 |
#if 0
|
| 339 |
/* CRC algorithm from RFC 2440 */
|
| 340 |
for (p = 0; p < in->length; p++) {
|
| 341 |
crc ^= in->data[p] << 16;
|
| 342 |
for (i = 0; i < 8; i++) {
|
| 343 |
crc <<= 1;
|
| 344 |
if (crc & 0x1000000)
|
| 345 |
crc ^= POLY;
|
| 346 |
}
|
| 347 |
}
|
| 348 |
#else
|
| 349 |
/* pre-computed CRC table -- much faster */
|
| 350 |
unsigned long table[256];
|
| 351 |
unsigned long t;
|
| 352 |
int q = 0;
|
| 353 |
|
| 354 |
table[0] = 0;
|
| 355 |
for (i = 0; i < 128; i++) {
|
| 356 |
t = table[i] << 1;
|
| 357 |
if (t & 0x1000000) {
|
| 358 |
table[q++] = t ^ POLY;
|
| 359 |
table[q++] = t;
|
| 360 |
} else {
|
| 361 |
table[q++] = t;
|
| 362 |
table[q++] = t ^ POLY;
|
| 363 |
}
|
| 364 |
}
|
| 365 |
for (p = 0; p < in->length; p++)
|
| 366 |
crc = crc << 8 ^ table[(in->data[p] ^ crc >> 16) & 255];
|
| 367 |
#endif
|
| 368 |
encode(in, 64);
|
| 369 |
|
| 370 |
out = buf_new();
|
| 371 |
if (mode == PGP_ARMOR_KEY || mode == PGP_ARMOR_NYMKEY)
|
| 372 |
buf_sets(out, begin_pgpkey);
|
| 373 |
else if (mode == PGP_ARMOR_NYMSIG)
|
| 374 |
buf_sets(out, begin_pgpsig);
|
| 375 |
else if (mode == PGP_ARMOR_SECKEY)
|
| 376 |
buf_sets(out, begin_pgpseckey);
|
| 377 |
else
|
| 378 |
buf_sets(out, begin_pgpmsg);
|
| 379 |
buf_nl(out);
|
| 380 |
#ifdef CLOAK
|
| 381 |
if (mode == PGP_ARMOR_REM || mode == PGP_ARMOR_NYMKEY || mode == PGP_ARMOR_NYMSIG)
|
| 382 |
buf_appends(out, "Version: N/A\n");
|
| 383 |
else
|
| 384 |
#elif MIMIC
|
| 385 |
if (mode == PGP_ARMOR_REM || mode == PGP_ARMOR_NYMKEY || mode == PGP_ARMOR_NYMSIG)
|
| 386 |
buf_appends(out, "Version: 2.6.3i\n");
|
| 387 |
else
|
| 388 |
#endif
|
| 389 |
{
|
| 390 |
buf_appends(out, "Version: Mixmaster ");
|
| 391 |
buf_appends(out, VERSION);
|
| 392 |
buf_appends(out, " (OpenPGP module)\n");
|
| 393 |
}
|
| 394 |
buf_nl(out);
|
| 395 |
buf_cat(out, in);
|
| 396 |
buf_reset(in);
|
| 397 |
buf_appendc(in, (crc >> 16) & 255);
|
| 398 |
buf_appendc(in, (crc >> 8) & 255);
|
| 399 |
buf_appendc(in, crc & 255);
|
| 400 |
encode(in, 0);
|
| 401 |
buf_appendc(out, '=');
|
| 402 |
buf_cat(out, in);
|
| 403 |
buf_nl(out);
|
| 404 |
if (mode == PGP_ARMOR_KEY || mode == PGP_ARMOR_NYMKEY)
|
| 405 |
buf_appends(out, end_pgpkey);
|
| 406 |
else if (mode == PGP_ARMOR_NYMSIG)
|
| 407 |
buf_appends(out, end_pgpsig);
|
| 408 |
else if (mode == PGP_ARMOR_SECKEY)
|
| 409 |
buf_appends(out, end_pgpseckey);
|
| 410 |
else
|
| 411 |
buf_appends(out, end_pgpmsg);
|
| 412 |
buf_nl(out);
|
| 413 |
|
| 414 |
buf_move(in, out);
|
| 415 |
buf_free(out);
|
| 416 |
return (0);
|
| 417 |
}
|
| 418 |
|
| 419 |
int pgp_keygen(int algo, int bits, BUFFER *userid, BUFFER *pass, char *pubring,
|
| 420 |
char *secring, int remail)
|
| 421 |
{
|
| 422 |
switch (algo) {
|
| 423 |
#ifdef USE_RSA
|
| 424 |
case PGP_ES_RSA:
|
| 425 |
return (pgp_rsakeygen(bits, userid, pass, pubring, secring, remail));
|
| 426 |
#endif
|
| 427 |
case PGP_E_ELG:
|
| 428 |
return (pgp_dhkeygen(bits, userid, pass, pubring, secring, remail));
|
| 429 |
default:
|
| 430 |
return -1;
|
| 431 |
}
|
| 432 |
}
|
| 433 |
|
| 434 |
int pgp_signtxt(BUFFER *msg, BUFFER *uid, BUFFER *pass,
|
| 435 |
char *secring, int remail)
|
| 436 |
{
|
| 437 |
int err;
|
| 438 |
BUFFER *line, *sig, *out;
|
| 439 |
|
| 440 |
sig = buf_new();
|
| 441 |
out = buf_new();
|
| 442 |
line = buf_new();
|
| 443 |
|
| 444 |
buf_appends(out, begin_pgpsigned);
|
| 445 |
buf_nl(out);
|
| 446 |
if (pgpdb_getkey(PK_SIGN, PGP_ANY, NULL, NULL, NULL, uid, NULL, NULL, secring, pass) == PGP_S_DSA)
|
| 447 |
buf_appends(out, "Hash: SHA1\n");
|
| 448 |
buf_nl(out);
|
| 449 |
while (buf_getline(msg, line) != -1) {
|
| 450 |
if (line->data[0] == '-')
|
| 451 |
buf_appends(out, "- ");
|
| 452 |
buf_cat(out, line);
|
| 453 |
buf_nl(out);
|
| 454 |
}
|
| 455 |
buf_nl(out);
|
| 456 |
|
| 457 |
buf_rewind(msg);
|
| 458 |
err = pgp_encrypt(PGP_SIGN | PGP_DETACHEDSIG | PGP_TEXT |
|
| 459 |
(remail ? PGP_REMAIL : 0),
|
| 460 |
msg, NULL, uid, pass, NULL, secring);
|
| 461 |
if (err == -1)
|
| 462 |
goto end;
|
| 463 |
buf_cat(out, msg);
|
| 464 |
buf_move(msg, out);
|
| 465 |
end:
|
| 466 |
buf_free(line);
|
| 467 |
buf_free(sig);
|
| 468 |
buf_free(out);
|
| 469 |
return (err);
|
| 470 |
}
|
| 471 |
|
| 472 |
#endif /* USE_PGP */
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