Bug Summary

File:src/lib/libcrypto/pem/pvkfmt.c
Warning:line 670, column 3
Value stored to 'length' is never read

Annotated Source Code

Press '?' to see keyboard shortcuts

clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name pvkfmt.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -fhalf-no-semantic-interposition -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/lib/libcrypto/obj -resource-dir /usr/local/lib/clang/13.0.0 -D LIBRESSL_INTERNAL -D LIBRESSL_CRYPTO_INTERNAL -D DSO_DLFCN -D HAVE_DLFCN_H -D HAVE_FUNOPEN -D OPENSSL_NO_HW_PADLOCK -I /usr/src/lib/libcrypto -I /usr/src/lib/libcrypto/asn1 -I /usr/src/lib/libcrypto/bio -I /usr/src/lib/libcrypto/bn -I /usr/src/lib/libcrypto/bytestring -I /usr/src/lib/libcrypto/dh -I /usr/src/lib/libcrypto/dsa -I /usr/src/lib/libcrypto/ec -I /usr/src/lib/libcrypto/ecdh -I /usr/src/lib/libcrypto/ecdsa -I /usr/src/lib/libcrypto/evp -I /usr/src/lib/libcrypto/hmac -I /usr/src/lib/libcrypto/modes -I /usr/src/lib/libcrypto/ocsp -I /usr/src/lib/libcrypto/rsa -I /usr/src/lib/libcrypto/x509 -I /usr/src/lib/libcrypto/obj -D AES_ASM -D BSAES_ASM -D VPAES_ASM -D OPENSSL_IA32_SSE2 -D RSA_ASM -D OPENSSL_BN_ASM_MONT -D OPENSSL_BN_ASM_MONT5 -D OPENSSL_BN_ASM_GF2m -D MD5_ASM -D GHASH_ASM -D RC4_MD5_ASM -D SHA1_ASM -D SHA256_ASM -D SHA512_ASM -D WHIRLPOOL_ASM -D OPENSSL_CPUID_OBJ -D PIC -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/lib/libcrypto/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/lib/libcrypto/pem/pvkfmt.c
1/* $OpenBSD: pvkfmt.c,v 1.25 2022/01/07 09:55:31 tb Exp $ */
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 2005.
4 */
5/* ====================================================================
6 * Copyright (c) 2005 The OpenSSL Project. All rights reserved.
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 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59/* Support for PVK format keys and related structures (such a PUBLICKEYBLOB
60 * and PRIVATEKEYBLOB).
61 */
62
63#include <stdlib.h>
64#include <string.h>
65
66#include <openssl/opensslconf.h>
67
68#include <openssl/bn.h>
69#include <openssl/err.h>
70#include <openssl/pem.h>
71
72#if !defined(OPENSSL_NO_RSA) && !defined(OPENSSL_NO_DSA)
73#include <openssl/dsa.h>
74#include <openssl/rsa.h>
75
76#include "bn_lcl.h"
77#include "dsa_locl.h"
78#include "evp_locl.h"
79#include "rsa_locl.h"
80
81/* Utility function: read a DWORD (4 byte unsigned integer) in little endian
82 * format
83 */
84
85static unsigned int
86read_ledword(const unsigned char **in)
87{
88 const unsigned char *p = *in;
89 unsigned int ret;
90
91 ret = *p++;
92 ret |= (*p++ << 8);
93 ret |= (*p++ << 16);
94 ret |= (*p++ << 24);
95 *in = p;
96 return ret;
97}
98
99/* Read a BIGNUM in little endian format. The docs say that this should take up
100 * bitlen/8 bytes.
101 */
102
103static int
104read_lebn(const unsigned char **in, unsigned int nbyte, BIGNUM **r)
105{
106 const unsigned char *p;
107 unsigned char *tmpbuf, *q;
108 unsigned int i;
109
110 p = *in + nbyte - 1;
111 tmpbuf = malloc(nbyte);
112 if (!tmpbuf)
113 return 0;
114 q = tmpbuf;
115 for (i = 0; i < nbyte; i++)
116 *q++ = *p--;
117 *r = BN_bin2bn(tmpbuf, nbyte, NULL((void*)0));
118 free(tmpbuf);
119 if (*r) {
120 *in += nbyte;
121 return 1;
122 } else
123 return 0;
124}
125
126
127/* Convert private key blob to EVP_PKEY: RSA and DSA keys supported */
128
129#define MS_PUBLICKEYBLOB0x6 0x6
130#define MS_PRIVATEKEYBLOB0x7 0x7
131#define MS_RSA1MAGIC0x31415352L 0x31415352L
132#define MS_RSA2MAGIC0x32415352L 0x32415352L
133#define MS_DSS1MAGIC0x31535344L 0x31535344L
134#define MS_DSS2MAGIC0x32535344L 0x32535344L
135
136#define MS_KEYALG_RSA_KEYX0xa400 0xa400
137#define MS_KEYALG_DSS_SIGN0x2200 0x2200
138
139#define MS_KEYTYPE_KEYX0x1 0x1
140#define MS_KEYTYPE_SIGN0x2 0x2
141
142/* The PVK file magic number: seems to spell out "bobsfile", who is Bob? */
143#define MS_PVKMAGIC0xb0b5f11eL 0xb0b5f11eL
144/* Salt length for PVK files */
145#define PVK_SALTLEN0x10 0x10
146
147static EVP_PKEY *b2i_rsa(const unsigned char **in, unsigned int length,
148 unsigned int bitlen, int ispub);
149static EVP_PKEY *b2i_dss(const unsigned char **in, unsigned int length,
150 unsigned int bitlen, int ispub);
151
152static int
153do_blob_header(const unsigned char **in, unsigned int length,
154 unsigned int *pmagic, unsigned int *pbitlen, int *pisdss, int *pispub)
155{
156 const unsigned char *p = *in;
157
158 if (length < 16)
159 return 0;
160 /* bType */
161 if (*p == MS_PUBLICKEYBLOB0x6) {
162 if (*pispub == 0) {
163 PEMerror(PEM_R_EXPECTING_PRIVATE_KEY_BLOB)ERR_put_error(9,(0xfff),(119),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,163);
164 return 0;
165 }
166 *pispub = 1;
167 } else if (*p == MS_PRIVATEKEYBLOB0x7) {
168 if (*pispub == 1) {
169 PEMerror(PEM_R_EXPECTING_PUBLIC_KEY_BLOB)ERR_put_error(9,(0xfff),(120),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,169);
170 return 0;
171 }
172 *pispub = 0;
173 } else
174 return 0;
175 p++;
176 /* Version */
177 if (*p++ != 0x2) {
178 PEMerror(PEM_R_BAD_VERSION_NUMBER)ERR_put_error(9,(0xfff),(117),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,178);
179 return 0;
180 }
181 /* Ignore reserved, aiKeyAlg */
182 p += 6;
183 *pmagic = read_ledword(&p);
184 *pbitlen = read_ledword(&p);
185 if (*pbitlen > 65536) {
186 PEMerror(PEM_R_INCONSISTENT_HEADER)ERR_put_error(9,(0xfff),(121),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,186);
187 return 0;
188 }
189 *pisdss = 0;
190 switch (*pmagic) {
191
192 case MS_DSS1MAGIC0x31535344L:
193 *pisdss = 1;
194 case MS_RSA1MAGIC0x31415352L:
195 if (*pispub == 0) {
196 PEMerror(PEM_R_EXPECTING_PRIVATE_KEY_BLOB)ERR_put_error(9,(0xfff),(119),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,196);
197 return 0;
198 }
199 break;
200
201 case MS_DSS2MAGIC0x32535344L:
202 *pisdss = 1;
203 case MS_RSA2MAGIC0x32415352L:
204 if (*pispub == 1) {
205 PEMerror(PEM_R_EXPECTING_PUBLIC_KEY_BLOB)ERR_put_error(9,(0xfff),(120),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,205);
206 return 0;
207 }
208 break;
209
210 default:
211 PEMerror(PEM_R_BAD_MAGIC_NUMBER)ERR_put_error(9,(0xfff),(116),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,211);
212 return -1;
213 }
214 *in = p;
215 return 1;
216}
217
218static unsigned int
219blob_length(unsigned bitlen, int isdss, int ispub)
220{
221 unsigned int nbyte, hnbyte;
222
223 nbyte = (bitlen + 7) >> 3;
224 hnbyte = (bitlen + 15) >> 4;
225 if (isdss) {
226
227 /* Expected length: 20 for q + 3 components bitlen each + 24
228 * for seed structure.
229 */
230 if (ispub)
231 return 44 + 3 * nbyte;
232 /* Expected length: 20 for q, priv, 2 bitlen components + 24
233 * for seed structure.
234 */
235 else
236 return 64 + 2 * nbyte;
237 } else {
238 /* Expected length: 4 for 'e' + 'n' */
239 if (ispub)
240 return 4 + nbyte;
241 else
242 /* Expected length: 4 for 'e' and 7 other components.
243 * 2 components are bitlen size, 5 are bitlen/2
244 */
245 return 4 + 2*nbyte + 5*hnbyte;
246 }
247
248}
249
250static EVP_PKEY *
251do_b2i(const unsigned char **in, unsigned int length, int ispub)
252{
253 const unsigned char *p = *in;
254 unsigned int bitlen, magic;
255 int isdss;
256
257 if (do_blob_header(&p, length, &magic, &bitlen, &isdss, &ispub) <= 0) {
258 PEMerror(PEM_R_KEYBLOB_HEADER_PARSE_ERROR)ERR_put_error(9,(0xfff),(122),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,258);
259 return NULL((void*)0);
260 }
261 length -= 16;
262 if (length < blob_length(bitlen, isdss, ispub)) {
263 PEMerror(PEM_R_KEYBLOB_TOO_SHORT)ERR_put_error(9,(0xfff),(123),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,263);
264 return NULL((void*)0);
265 }
266 if (isdss)
267 return b2i_dss(&p, length, bitlen, ispub);
268 else
269 return b2i_rsa(&p, length, bitlen, ispub);
270}
271
272static EVP_PKEY *
273do_b2i_bio(BIO *in, int ispub)
274{
275 const unsigned char *p;
276 unsigned char hdr_buf[16], *buf = NULL((void*)0);
277 unsigned int bitlen, magic, length;
278 int isdss;
279 EVP_PKEY *ret = NULL((void*)0);
280
281 if (BIO_read(in, hdr_buf, 16) != 16) {
282 PEMerror(PEM_R_KEYBLOB_TOO_SHORT)ERR_put_error(9,(0xfff),(123),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,282);
283 return NULL((void*)0);
284 }
285 p = hdr_buf;
286 if (do_blob_header(&p, 16, &magic, &bitlen, &isdss, &ispub) <= 0)
287 return NULL((void*)0);
288
289 length = blob_length(bitlen, isdss, ispub);
290 buf = malloc(length);
291 if (!buf) {
292 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,292);
293 goto err;
294 }
295 p = buf;
296 if (BIO_read(in, buf, length) != (int)length) {
297 PEMerror(PEM_R_KEYBLOB_TOO_SHORT)ERR_put_error(9,(0xfff),(123),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,297);
298 goto err;
299 }
300
301 if (isdss)
302 ret = b2i_dss(&p, length, bitlen, ispub);
303 else
304 ret = b2i_rsa(&p, length, bitlen, ispub);
305
306 err:
307 free(buf);
308 return ret;
309}
310
311static EVP_PKEY *
312b2i_dss(const unsigned char **in, unsigned int length, unsigned int bitlen,
313 int ispub)
314{
315 const unsigned char *p = *in;
316 EVP_PKEY *ret = NULL((void*)0);
317 DSA *dsa = NULL((void*)0);
318 BN_CTX *ctx = NULL((void*)0);
319 unsigned int nbyte;
320
321 nbyte = (bitlen + 7) >> 3;
322
323 dsa = DSA_new();
324 ret = EVP_PKEY_new();
325 if (!dsa || !ret)
326 goto err;
327 if (!read_lebn(&p, nbyte, &dsa->p))
328 goto err;
329 if (!read_lebn(&p, 20, &dsa->q))
330 goto err;
331 if (!read_lebn(&p, nbyte, &dsa->g))
332 goto err;
333 if (ispub) {
334 if (!read_lebn(&p, nbyte, &dsa->pub_key))
335 goto err;
336 } else {
337 if (!read_lebn(&p, 20, &dsa->priv_key))
338 goto err;
339 /* Calculate public key */
340 if (!(dsa->pub_key = BN_new()))
341 goto err;
342 if (!(ctx = BN_CTX_new()))
343 goto err;
344 if (!BN_mod_exp_ct(dsa->pub_key, dsa->g,
345 dsa->priv_key, dsa->p, ctx))
346 goto err;
347 BN_CTX_free(ctx);
348 }
349
350 EVP_PKEY_set1_DSA(ret, dsa);
351 DSA_free(dsa);
352 *in = p;
353 return ret;
354
355 err:
356 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,356);
357 DSA_free(dsa);
358 EVP_PKEY_free(ret);
359 BN_CTX_free(ctx);
360 return NULL((void*)0);
361}
362
363static EVP_PKEY *
364b2i_rsa(const unsigned char **in, unsigned int length, unsigned int bitlen,
365 int ispub)
366{
367 const unsigned char *p = *in;
368 EVP_PKEY *ret = NULL((void*)0);
369 RSA *rsa = NULL((void*)0);
370 unsigned int nbyte, hnbyte;
371
372 nbyte = (bitlen + 7) >> 3;
373 hnbyte = (bitlen + 15) >> 4;
374 rsa = RSA_new();
375 ret = EVP_PKEY_new();
376 if (!rsa || !ret)
377 goto err;
378 rsa->e = BN_new();
379 if (!rsa->e)
380 goto err;
381 if (!BN_set_word(rsa->e, read_ledword(&p)))
382 goto err;
383 if (!read_lebn(&p, nbyte, &rsa->n))
384 goto err;
385 if (!ispub) {
386 if (!read_lebn(&p, hnbyte, &rsa->p))
387 goto err;
388 if (!read_lebn(&p, hnbyte, &rsa->q))
389 goto err;
390 if (!read_lebn(&p, hnbyte, &rsa->dmp1))
391 goto err;
392 if (!read_lebn(&p, hnbyte, &rsa->dmq1))
393 goto err;
394 if (!read_lebn(&p, hnbyte, &rsa->iqmp))
395 goto err;
396 if (!read_lebn(&p, nbyte, &rsa->d))
397 goto err;
398 }
399
400 EVP_PKEY_set1_RSA(ret, rsa);
401 RSA_free(rsa);
402 *in = p;
403 return ret;
404
405 err:
406 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,406);
407 RSA_free(rsa);
408 EVP_PKEY_free(ret);
409 return NULL((void*)0);
410}
411
412EVP_PKEY *
413b2i_PrivateKey(const unsigned char **in, long length)
414{
415 return do_b2i(in, length, 0);
416}
417
418EVP_PKEY *
419b2i_PublicKey(const unsigned char **in, long length)
420{
421 return do_b2i(in, length, 1);
422}
423
424EVP_PKEY *
425b2i_PrivateKey_bio(BIO *in)
426{
427 return do_b2i_bio(in, 0);
428}
429
430EVP_PKEY *
431b2i_PublicKey_bio(BIO *in)
432{
433 return do_b2i_bio(in, 1);
434}
435
436static void
437write_ledword(unsigned char **out, unsigned int dw)
438{
439 unsigned char *p = *out;
440
441 *p++ = dw & 0xff;
442 *p++ = (dw >> 8) & 0xff;
443 *p++ = (dw >> 16) & 0xff;
444 *p++ = (dw >> 24) & 0xff;
445 *out = p;
446}
447
448static void
449write_lebn(unsigned char **out, const BIGNUM *bn, int len)
450{
451 int nb, i;
452 unsigned char *p = *out, *q, c;
453
454 nb = BN_num_bytes(bn)((BN_num_bits(bn)+7)/8);
455 BN_bn2bin(bn, p);
456 q = p + nb - 1;
457 /* In place byte order reversal */
458 for (i = 0; i < nb / 2; i++) {
459 c = *p;
460 *p++ = *q;
461 *q-- = c;
462 }
463 *out += nb;
464 /* Pad with zeroes if we have to */
465 if (len > 0) {
466 len -= nb;
467 if (len > 0) {
468 memset(*out, 0, len);
469 *out += len;
470 }
471 }
472}
473
474
475static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *magic);
476static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *magic);
477
478static void write_rsa(unsigned char **out, RSA *rsa, int ispub);
479static void write_dsa(unsigned char **out, DSA *dsa, int ispub);
480
481static int
482do_i2b(unsigned char **out, EVP_PKEY *pk, int ispub)
483{
484 unsigned char *p;
485 unsigned int bitlen, magic = 0, keyalg;
486 int outlen, noinc = 0;
487
488 if (pk->type == EVP_PKEY_DSA116) {
489 bitlen = check_bitlen_dsa(pk->pkey.dsa, ispub, &magic);
490 keyalg = MS_KEYALG_DSS_SIGN0x2200;
491 } else if (pk->type == EVP_PKEY_RSA6) {
492 bitlen = check_bitlen_rsa(pk->pkey.rsa, ispub, &magic);
493 keyalg = MS_KEYALG_RSA_KEYX0xa400;
494 } else
495 return -1;
496 if (bitlen == 0)
497 return -1;
498 outlen = 16 + blob_length(bitlen,
499 keyalg == MS_KEYALG_DSS_SIGN0x2200 ? 1 : 0, ispub);
500 if (out == NULL((void*)0))
501 return outlen;
502 if (*out)
503 p = *out;
504 else {
505 p = malloc(outlen);
506 if (!p)
507 return -1;
508 *out = p;
509 noinc = 1;
510 }
511 if (ispub)
512 *p++ = MS_PUBLICKEYBLOB0x6;
513 else
514 *p++ = MS_PRIVATEKEYBLOB0x7;
515 *p++ = 0x2;
516 *p++ = 0;
517 *p++ = 0;
518 write_ledword(&p, keyalg);
519 write_ledword(&p, magic);
520 write_ledword(&p, bitlen);
521 if (keyalg == MS_KEYALG_DSS_SIGN0x2200)
522 write_dsa(&p, pk->pkey.dsa, ispub);
523 else
524 write_rsa(&p, pk->pkey.rsa, ispub);
525 if (!noinc)
526 *out += outlen;
527 return outlen;
528}
529
530static int
531do_i2b_bio(BIO *out, EVP_PKEY *pk, int ispub)
532{
533 unsigned char *tmp = NULL((void*)0);
534 int outlen, wrlen;
535
536 outlen = do_i2b(&tmp, pk, ispub);
537 if (outlen < 0)
538 return -1;
539 wrlen = BIO_write(out, tmp, outlen);
540 free(tmp);
541 if (wrlen == outlen)
542 return outlen;
543 return -1;
544}
545
546static int
547check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *pmagic)
548{
549 int bitlen;
550
551 bitlen = BN_num_bits(dsa->p);
552 if ((bitlen & 7) || (BN_num_bits(dsa->q) != 160) ||
553 (BN_num_bits(dsa->g) > bitlen))
554 goto err;
555 if (ispub) {
556 if (BN_num_bits(dsa->pub_key) > bitlen)
557 goto err;
558 *pmagic = MS_DSS1MAGIC0x31535344L;
559 } else {
560 if (BN_num_bits(dsa->priv_key) > 160)
561 goto err;
562 *pmagic = MS_DSS2MAGIC0x32535344L;
563 }
564
565 return bitlen;
566
567 err:
568 PEMerror(PEM_R_UNSUPPORTED_KEY_COMPONENTS)ERR_put_error(9,(0xfff),(126),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,568);
569 return 0;
570}
571
572static int
573check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *pmagic)
574{
575 int nbyte, hnbyte, bitlen;
576
577 if (BN_num_bits(rsa->e) > 32)
578 goto err;
579 bitlen = BN_num_bits(rsa->n);
580 nbyte = BN_num_bytes(rsa->n)((BN_num_bits(rsa->n)+7)/8);
581 hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
582 if (ispub) {
583 *pmagic = MS_RSA1MAGIC0x31415352L;
584 return bitlen;
585 } else {
586 *pmagic = MS_RSA2MAGIC0x32415352L;
587 /* For private key each component must fit within nbyte or
588 * hnbyte.
589 */
590 if (BN_num_bytes(rsa->d)((BN_num_bits(rsa->d)+7)/8) > nbyte)
591 goto err;
592 if ((BN_num_bytes(rsa->iqmp)((BN_num_bits(rsa->iqmp)+7)/8) > hnbyte) ||
593 (BN_num_bytes(rsa->p)((BN_num_bits(rsa->p)+7)/8) > hnbyte) ||
594 (BN_num_bytes(rsa->q)((BN_num_bits(rsa->q)+7)/8) > hnbyte) ||
595 (BN_num_bytes(rsa->dmp1)((BN_num_bits(rsa->dmp1)+7)/8) > hnbyte) ||
596 (BN_num_bytes(rsa->dmq1)((BN_num_bits(rsa->dmq1)+7)/8) > hnbyte))
597 goto err;
598 }
599 return bitlen;
600
601 err:
602 PEMerror(PEM_R_UNSUPPORTED_KEY_COMPONENTS)ERR_put_error(9,(0xfff),(126),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,602);
603 return 0;
604}
605
606static void
607write_rsa(unsigned char **out, RSA *rsa, int ispub)
608{
609 int nbyte, hnbyte;
610
611 nbyte = BN_num_bytes(rsa->n)((BN_num_bits(rsa->n)+7)/8);
612 hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
613 write_lebn(out, rsa->e, 4);
614 write_lebn(out, rsa->n, -1);
615 if (ispub)
616 return;
617 write_lebn(out, rsa->p, hnbyte);
618 write_lebn(out, rsa->q, hnbyte);
619 write_lebn(out, rsa->dmp1, hnbyte);
620 write_lebn(out, rsa->dmq1, hnbyte);
621 write_lebn(out, rsa->iqmp, hnbyte);
622 write_lebn(out, rsa->d, nbyte);
623}
624
625static void
626write_dsa(unsigned char **out, DSA *dsa, int ispub)
627{
628 int nbyte;
629
630 nbyte = BN_num_bytes(dsa->p)((BN_num_bits(dsa->p)+7)/8);
631 write_lebn(out, dsa->p, nbyte);
632 write_lebn(out, dsa->q, 20);
633 write_lebn(out, dsa->g, nbyte);
634 if (ispub)
635 write_lebn(out, dsa->pub_key, nbyte);
636 else
637 write_lebn(out, dsa->priv_key, 20);
638 /* Set "invalid" for seed structure values */
639 memset(*out, 0xff, 24);
640 *out += 24;
641 return;
642}
643
644int
645i2b_PrivateKey_bio(BIO *out, EVP_PKEY *pk)
646{
647 return do_i2b_bio(out, pk, 0);
648}
649
650int
651i2b_PublicKey_bio(BIO *out, EVP_PKEY *pk)
652{
653 return do_i2b_bio(out, pk, 1);
654}
655
656#ifndef OPENSSL_NO_RC4
657
658static int
659do_PVK_header(const unsigned char **in, unsigned int length, int skip_magic,
660 unsigned int *psaltlen, unsigned int *pkeylen)
661{
662 const unsigned char *p = *in;
663 unsigned int pvk_magic, is_encrypted;
664
665 if (skip_magic) {
666 if (length < 20) {
667 PEMerror(PEM_R_PVK_TOO_SHORT)ERR_put_error(9,(0xfff),(125),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,667);
668 return 0;
669 }
670 length -= 20;
Value stored to 'length' is never read
671 } else {
672 if (length < 24) {
673 PEMerror(PEM_R_PVK_TOO_SHORT)ERR_put_error(9,(0xfff),(125),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,673);
674 return 0;
675 }
676 length -= 24;
677 pvk_magic = read_ledword(&p);
678 if (pvk_magic != MS_PVKMAGIC0xb0b5f11eL) {
679 PEMerror(PEM_R_BAD_MAGIC_NUMBER)ERR_put_error(9,(0xfff),(116),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,679);
680 return 0;
681 }
682 }
683 /* Skip reserved */
684 p += 4;
685 /*keytype = */read_ledword(&p);
686 is_encrypted = read_ledword(&p);
687 *psaltlen = read_ledword(&p);
688 *pkeylen = read_ledword(&p);
689 if (*psaltlen > 65536 || *pkeylen > 65536) {
690 PEMerror(PEM_R_ERROR_CONVERTING_PRIVATE_KEY)ERR_put_error(9,(0xfff),(115),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,690);
691 return 0;
692 }
693
694 if (is_encrypted && !*psaltlen) {
695 PEMerror(PEM_R_INCONSISTENT_HEADER)ERR_put_error(9,(0xfff),(121),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,695);
696 return 0;
697 }
698
699 *in = p;
700 return 1;
701}
702
703static int
704derive_pvk_key(unsigned char *key, const unsigned char *salt,
705 unsigned int saltlen, const unsigned char *pass, int passlen)
706{
707 EVP_MD_CTX mctx;
708 int rv = 1;
709
710 EVP_MD_CTX_init(&mctx);
711 if (!EVP_DigestInit_ex(&mctx, EVP_sha1(), NULL((void*)0)) ||
712 !EVP_DigestUpdate(&mctx, salt, saltlen) ||
713 !EVP_DigestUpdate(&mctx, pass, passlen) ||
714 !EVP_DigestFinal_ex(&mctx, key, NULL((void*)0)))
715 rv = 0;
716
717 EVP_MD_CTX_cleanup(&mctx);
718 return rv;
719}
720
721static EVP_PKEY *
722do_PVK_body(const unsigned char **in, unsigned int saltlen,
723 unsigned int keylen, pem_password_cb *cb, void *u)
724{
725 EVP_PKEY *ret = NULL((void*)0);
726 const unsigned char *p = *in;
727 unsigned int magic;
728 unsigned char *enctmp = NULL((void*)0), *q;
729 EVP_CIPHER_CTX *cctx = NULL((void*)0);
730
731 if ((cctx = EVP_CIPHER_CTX_new()) == NULL((void*)0)) {
732 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,732);
733 goto err;
734 }
735 if (saltlen) {
736 char psbuf[PEM_BUFSIZE1024];
737 unsigned char keybuf[20];
738 int enctmplen, inlen;
739
740 if (cb)
741 inlen = cb(psbuf, PEM_BUFSIZE1024, 0, u);
742 else
743 inlen = PEM_def_callback(psbuf, PEM_BUFSIZE1024, 0, u);
744 if (inlen <= 0) {
745 PEMerror(PEM_R_BAD_PASSWORD_READ)ERR_put_error(9,(0xfff),(104),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,745);
746 goto err;
747 }
748 enctmp = malloc(keylen + 8);
749 if (!enctmp) {
750 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,750);
751 goto err;
752 }
753 if (!derive_pvk_key(keybuf, p, saltlen, (unsigned char *)psbuf,
754 inlen)) {
755 goto err;
756 }
757 p += saltlen;
758 /* Copy BLOBHEADER across, decrypt rest */
759 memcpy(enctmp, p, 8);
760 p += 8;
761 if (keylen < 8) {
762 PEMerror(PEM_R_PVK_TOO_SHORT)ERR_put_error(9,(0xfff),(125),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,762);
763 goto err;
764 }
765 inlen = keylen - 8;
766 q = enctmp + 8;
767 if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL((void*)0), keybuf, NULL((void*)0)))
768 goto err;
769 if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen))
770 goto err;
771 if (!EVP_DecryptFinal_ex(cctx, q + enctmplen, &enctmplen))
772 goto err;
773 magic = read_ledword((const unsigned char **)&q);
774 if (magic != MS_RSA2MAGIC0x32415352L && magic != MS_DSS2MAGIC0x32535344L) {
775 q = enctmp + 8;
776 memset(keybuf + 5, 0, 11);
777 if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL((void*)0), keybuf,
778 NULL((void*)0)))
779 goto err;
780 explicit_bzero(keybuf, 20);
781 if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen))
782 goto err;
783 if (!EVP_DecryptFinal_ex(cctx, q + enctmplen,
784 &enctmplen))
785 goto err;
786 magic = read_ledword((const unsigned char **)&q);
787 if (magic != MS_RSA2MAGIC0x32415352L && magic != MS_DSS2MAGIC0x32535344L) {
788 PEMerror(PEM_R_BAD_DECRYPT)ERR_put_error(9,(0xfff),(101),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,788);
789 goto err;
790 }
791 } else
792 explicit_bzero(keybuf, 20);
793 p = enctmp;
794 }
795
796 ret = b2i_PrivateKey(&p, keylen);
797
798 err:
799 EVP_CIPHER_CTX_free(cctx);
800 if (enctmp && saltlen)
801 free(enctmp);
802 return ret;
803}
804
805
806EVP_PKEY *
807b2i_PVK_bio(BIO *in, pem_password_cb *cb, void *u)
808{
809 unsigned char pvk_hdr[24], *buf = NULL((void*)0);
810 const unsigned char *p;
811 size_t buflen;
812 EVP_PKEY *ret = NULL((void*)0);
813 unsigned int saltlen, keylen;
814
815 if (BIO_read(in, pvk_hdr, 24) != 24) {
816 PEMerror(PEM_R_PVK_DATA_TOO_SHORT)ERR_put_error(9,(0xfff),(124),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,816);
817 return NULL((void*)0);
818 }
819 p = pvk_hdr;
820
821 if (!do_PVK_header(&p, 24, 0, &saltlen, &keylen))
822 return 0;
823 buflen = keylen + saltlen;
824 buf = malloc(buflen);
825 if (!buf) {
826 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,826);
827 return 0;
828 }
829 p = buf;
830 if (BIO_read(in, buf, buflen) != buflen) {
831 PEMerror(PEM_R_PVK_DATA_TOO_SHORT)ERR_put_error(9,(0xfff),(124),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,831);
832 goto err;
833 }
834 ret = do_PVK_body(&p, saltlen, keylen, cb, u);
835
836 err:
837 freezero(buf, buflen);
838 return ret;
839}
840
841static int
842i2b_PVK(unsigned char **out, EVP_PKEY*pk, int enclevel, pem_password_cb *cb,
843 void *u)
844{
845 int outlen = 24, pklen;
846 unsigned char *p = NULL((void*)0), *start = NULL((void*)0), *salt = NULL((void*)0);
847 EVP_CIPHER_CTX *cctx = NULL((void*)0);
848
849 if ((cctx = EVP_CIPHER_CTX_new()) == NULL((void*)0)) {
850 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,850);
851 goto err;
852 }
853 if (enclevel != 0)
854 outlen += PVK_SALTLEN0x10;
855 pklen = do_i2b(NULL((void*)0), pk, 0);
856 if (pklen < 0)
857 goto err;
858 outlen += pklen;
859 start = p = malloc(outlen);
860 if (!p) {
861 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,861);
862 goto err;
863 }
864
865 write_ledword(&p, MS_PVKMAGIC0xb0b5f11eL);
866 write_ledword(&p, 0);
867 if (pk->type == EVP_PKEY_DSA116)
868 write_ledword(&p, MS_KEYTYPE_SIGN0x2);
869 else
870 write_ledword(&p, MS_KEYTYPE_KEYX0x1);
871 write_ledword(&p, enclevel ? 1 : 0);
872 write_ledword(&p, enclevel ? PVK_SALTLEN0x10 : 0);
873 write_ledword(&p, pklen);
874 if (enclevel != 0) {
875 arc4random_buf(p, PVK_SALTLEN0x10);
876 salt = p;
877 p += PVK_SALTLEN0x10;
878 }
879 do_i2b(&p, pk, 0);
880 if (enclevel != 0) {
881 char psbuf[PEM_BUFSIZE1024];
882 unsigned char keybuf[20];
883 int enctmplen, inlen;
884 if (cb)
885 inlen = cb(psbuf, PEM_BUFSIZE1024, 1, u);
886 else
887 inlen = PEM_def_callback(psbuf, PEM_BUFSIZE1024, 1, u);
888 if (inlen <= 0) {
889 PEMerror(PEM_R_BAD_PASSWORD_READ)ERR_put_error(9,(0xfff),(104),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,889);
890 goto err;
891 }
892 if (!derive_pvk_key(keybuf, salt, PVK_SALTLEN0x10,
893 (unsigned char *)psbuf, inlen))
894 goto err;
895 if (enclevel == 1)
896 memset(keybuf + 5, 0, 11);
897 p = salt + PVK_SALTLEN0x10 + 8;
898 if (!EVP_EncryptInit_ex(cctx, EVP_rc4(), NULL((void*)0), keybuf, NULL((void*)0)))
899 goto err;
900 explicit_bzero(keybuf, 20);
901 if (!EVP_EncryptUpdate(cctx, p, &enctmplen, p, pklen - 8))
902 goto err;
903 if (!EVP_EncryptFinal_ex(cctx, p + enctmplen, &enctmplen))
904 goto err;
905 }
906 EVP_CIPHER_CTX_free(cctx);
907 *out = start;
908 return outlen;
909
910 err:
911 EVP_CIPHER_CTX_free(cctx);
912 free(start);
913 return -1;
914}
915
916int
917i2b_PVK_bio(BIO *out, EVP_PKEY *pk, int enclevel, pem_password_cb *cb, void *u)
918{
919 unsigned char *tmp = NULL((void*)0);
920 int outlen, wrlen;
921
922 outlen = i2b_PVK(&tmp, pk, enclevel, cb, u);
923 if (outlen < 0)
924 return -1;
925 wrlen = BIO_write(out, tmp, outlen);
926 free(tmp);
927 if (wrlen != outlen) {
928 PEMerror(PEM_R_BIO_WRITE_FAILURE)ERR_put_error(9,(0xfff),(118),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,928);
929 return -1;
930 }
931 return outlen;
932}
933
934#endif
935
936#endif