1/* crypto/pem/pem_lib.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] */ 57 58#include <assert.h> 59#include <ctype.h> 60#include <stdio.h> 61#include <string.h> 62 63#include <openssl/base64.h> 64#include <openssl/buf.h> 65#include <openssl/des.h> 66#include <openssl/err.h> 67#include <openssl/evp.h> 68#include <openssl/mem.h> 69#include <openssl/obj.h> 70#include <openssl/pem.h> 71#include <openssl/rand.h> 72#include <openssl/x509.h> 73 74#include "../evp/internal.h" 75 76 77#define MIN_LENGTH 4 78 79static int load_iv(char **fromp,unsigned char *to, int num); 80static int check_pem(const char *nm, const char *name); 81int pem_check_suffix(const char *pem_str, const char *suffix); 82 83void PEM_proc_type(char *buf, int type) 84 { 85 const char *str; 86 87 if (type == PEM_TYPE_ENCRYPTED) 88 str="ENCRYPTED"; 89 else if (type == PEM_TYPE_MIC_CLEAR) 90 str="MIC-CLEAR"; 91 else if (type == PEM_TYPE_MIC_ONLY) 92 str="MIC-ONLY"; 93 else 94 str="BAD-TYPE"; 95 96 BUF_strlcat(buf,"Proc-Type: 4,",PEM_BUFSIZE); 97 BUF_strlcat(buf,str,PEM_BUFSIZE); 98 BUF_strlcat(buf,"\n",PEM_BUFSIZE); 99 } 100 101void PEM_dek_info(char *buf, const char *type, int len, char *str) 102 { 103 static const unsigned char map[17]="0123456789ABCDEF"; 104 long i; 105 int j; 106 107 BUF_strlcat(buf,"DEK-Info: ",PEM_BUFSIZE); 108 BUF_strlcat(buf,type,PEM_BUFSIZE); 109 BUF_strlcat(buf,",",PEM_BUFSIZE); 110 j=strlen(buf); 111 if (j + (len * 2) + 1 > PEM_BUFSIZE) 112 return; 113 for (i=0; i<len; i++) 114 { 115 buf[j+i*2] =map[(str[i]>>4)&0x0f]; 116 buf[j+i*2+1]=map[(str[i] )&0x0f]; 117 } 118 buf[j+i*2]='\n'; 119 buf[j+i*2+1]='\0'; 120 } 121 122#ifndef OPENSSL_NO_FP_API 123void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x, 124 pem_password_cb *cb, void *u) 125 { 126 BIO *b; 127 void *ret; 128 129 if ((b=BIO_new(BIO_s_file())) == NULL) 130 { 131 OPENSSL_PUT_ERROR(PEM, PEM_ASN1_read, ERR_R_BUF_LIB); 132 return(0); 133 } 134 BIO_set_fp(b,fp,BIO_NOCLOSE); 135 ret=PEM_ASN1_read_bio(d2i,name,b,x,cb,u); 136 BIO_free(b); 137 return(ret); 138 } 139#endif 140 141static int check_pem(const char *nm, const char *name) 142{ 143 /* Normal matching nm and name */ 144 if (!strcmp(nm,name)) return 1; 145 146 /* Make PEM_STRING_EVP_PKEY match any private key */ 147 148 if(!strcmp(name,PEM_STRING_EVP_PKEY)) 149 { 150 int slen; 151 const EVP_PKEY_ASN1_METHOD *ameth; 152 if(!strcmp(nm,PEM_STRING_PKCS8)) 153 return 1; 154 if(!strcmp(nm,PEM_STRING_PKCS8INF)) 155 return 1; 156 slen = pem_check_suffix(nm, "PRIVATE KEY"); 157 if (slen > 0) 158 { 159 /* NB: ENGINE implementations wont contain 160 * a deprecated old private key decode function 161 * so don't look for them. 162 */ 163 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen); 164 if (ameth && ameth->old_priv_decode) 165 return 1; 166 } 167 return 0; 168 } 169 170 if(!strcmp(name,PEM_STRING_PARAMETERS)) 171 { 172 int slen; 173 const EVP_PKEY_ASN1_METHOD *ameth; 174 slen = pem_check_suffix(nm, "PARAMETERS"); 175 if (slen > 0) 176 { 177 ENGINE *e; 178 ameth = EVP_PKEY_asn1_find_str(&e, nm, slen); 179 if (ameth) 180 { 181 int r; 182 if (ameth->param_decode) 183 r = 1; 184 else 185 r = 0; 186 return r; 187 } 188 } 189 return 0; 190 } 191 /* If reading DH parameters handle X9.42 DH format too */ 192 if(!strcmp(nm,PEM_STRING_DHXPARAMS) && 193 !strcmp(name,PEM_STRING_DHPARAMS)) return 1; 194 195 /* Permit older strings */ 196 197 if(!strcmp(nm,PEM_STRING_X509_OLD) && 198 !strcmp(name,PEM_STRING_X509)) return 1; 199 200 if(!strcmp(nm,PEM_STRING_X509_REQ_OLD) && 201 !strcmp(name,PEM_STRING_X509_REQ)) return 1; 202 203 /* Allow normal certs to be read as trusted certs */ 204 if(!strcmp(nm,PEM_STRING_X509) && 205 !strcmp(name,PEM_STRING_X509_TRUSTED)) return 1; 206 207 if(!strcmp(nm,PEM_STRING_X509_OLD) && 208 !strcmp(name,PEM_STRING_X509_TRUSTED)) return 1; 209 210 /* Some CAs use PKCS#7 with CERTIFICATE headers */ 211 if(!strcmp(nm, PEM_STRING_X509) && 212 !strcmp(name, PEM_STRING_PKCS7)) return 1; 213 214 if(!strcmp(nm, PEM_STRING_PKCS7_SIGNED) && 215 !strcmp(name, PEM_STRING_PKCS7)) return 1; 216 217#ifndef OPENSSL_NO_CMS 218 if(!strcmp(nm, PEM_STRING_X509) && 219 !strcmp(name, PEM_STRING_CMS)) return 1; 220 /* Allow CMS to be read from PKCS#7 headers */ 221 if(!strcmp(nm, PEM_STRING_PKCS7) && 222 !strcmp(name, PEM_STRING_CMS)) return 1; 223#endif 224 225 return 0; 226} 227 228int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm, const char *name, BIO *bp, 229 pem_password_cb *cb, void *u) 230 { 231 EVP_CIPHER_INFO cipher; 232 char *nm=NULL,*header=NULL; 233 unsigned char *data=NULL; 234 long len; 235 int ret = 0; 236 237 for (;;) 238 { 239 if (!PEM_read_bio(bp,&nm,&header,&data,&len)) { 240 if(ERR_GET_REASON(ERR_peek_error()) == 241 PEM_R_NO_START_LINE) 242 ERR_add_error_data(2, "Expecting: ", name); 243 return 0; 244 } 245 if(check_pem(nm, name)) break; 246 OPENSSL_free(nm); 247 OPENSSL_free(header); 248 OPENSSL_free(data); 249 } 250 if (!PEM_get_EVP_CIPHER_INFO(header,&cipher)) goto err; 251 if (!PEM_do_header(&cipher,data,&len,cb,u)) goto err; 252 253 *pdata = data; 254 *plen = len; 255 256 if (pnm) 257 *pnm = nm; 258 259 ret = 1; 260 261err: 262 if (!ret || !pnm) OPENSSL_free(nm); 263 OPENSSL_free(header); 264 if (!ret) OPENSSL_free(data); 265 return ret; 266 } 267 268#ifndef OPENSSL_NO_FP_API 269int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp, 270 void *x, const EVP_CIPHER *enc, unsigned char *kstr, 271 int klen, pem_password_cb *callback, void *u) 272 { 273 BIO *b; 274 int ret; 275 276 if ((b=BIO_new(BIO_s_file())) == NULL) 277 { 278 OPENSSL_PUT_ERROR(PEM, PEM_ASN1_write, ERR_R_BUF_LIB); 279 return(0); 280 } 281 BIO_set_fp(b,fp,BIO_NOCLOSE); 282 ret=PEM_ASN1_write_bio(i2d,name,b,x,enc,kstr,klen,callback,u); 283 BIO_free(b); 284 return(ret); 285 } 286#endif 287 288int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp, 289 void *x, const EVP_CIPHER *enc, unsigned char *kstr, 290 int klen, pem_password_cb *callback, void *u) 291 { 292 EVP_CIPHER_CTX ctx; 293 int dsize=0,i,j,ret=0; 294 unsigned char *p,*data=NULL; 295 const char *objstr=NULL; 296 char buf[PEM_BUFSIZE]; 297 unsigned char key[EVP_MAX_KEY_LENGTH]; 298 unsigned char iv[EVP_MAX_IV_LENGTH]; 299 300 if (enc != NULL) 301 { 302 objstr=OBJ_nid2sn(EVP_CIPHER_nid(enc)); 303 if (objstr == NULL) 304 { 305 OPENSSL_PUT_ERROR(PEM, PEM_ASN1_write_bio, PEM_R_UNSUPPORTED_CIPHER); 306 goto err; 307 } 308 } 309 310 if ((dsize=i2d(x,NULL)) < 0) 311 { 312 OPENSSL_PUT_ERROR(PEM, PEM_ASN1_write_bio, ERR_R_ASN1_LIB); 313 dsize=0; 314 goto err; 315 } 316 /* dzise + 8 bytes are needed */ 317 /* actually it needs the cipher block size extra... */ 318 data=(unsigned char *)OPENSSL_malloc((unsigned int)dsize+20); 319 if (data == NULL) 320 { 321 OPENSSL_PUT_ERROR(PEM, PEM_ASN1_write_bio, ERR_R_MALLOC_FAILURE); 322 goto err; 323 } 324 p=data; 325 i=i2d(x,&p); 326 327 if (enc != NULL) 328 { 329 const unsigned iv_len = EVP_CIPHER_iv_length(enc); 330 331 if (kstr == NULL) 332 { 333 klen = 0; 334 if (!callback) 335 callback = PEM_def_callback; 336 klen=(*callback)(buf,PEM_BUFSIZE,1,u); 337 if (klen <= 0) 338 { 339 OPENSSL_PUT_ERROR(PEM, PEM_ASN1_write_bio, PEM_R_READ_KEY); 340 goto err; 341 } 342 kstr=(unsigned char *)buf; 343 } 344 assert(iv_len <= (int)sizeof(iv)); 345 if (!RAND_bytes(iv, iv_len)) /* Generate a salt */ 346 goto err; 347 /* The 'iv' is used as the iv and as a salt. It is 348 * NOT taken from the BytesToKey function */ 349 if (!EVP_BytesToKey(enc,EVP_md5(),iv,kstr,klen,1,key,NULL)) 350 goto err; 351 352 if (kstr == (unsigned char *)buf) OPENSSL_cleanse(buf,PEM_BUFSIZE); 353 354 assert(strlen(objstr)+23+2*iv_len+13 <= sizeof buf); 355 356 buf[0]='\0'; 357 PEM_proc_type(buf,PEM_TYPE_ENCRYPTED); 358 PEM_dek_info(buf,objstr,iv_len,(char *)iv); 359 /* k=strlen(buf); */ 360 361 EVP_CIPHER_CTX_init(&ctx); 362 ret = 1; 363 if (!EVP_EncryptInit_ex(&ctx,enc,NULL,key,iv) 364 || !EVP_EncryptUpdate(&ctx,data,&j,data,i) 365 || !EVP_EncryptFinal_ex(&ctx,&(data[j]),&i)) 366 ret = 0; 367 else 368 i += j; 369 EVP_CIPHER_CTX_cleanup(&ctx); 370 if (ret == 0) 371 goto err; 372 } 373 else 374 { 375 ret=1; 376 buf[0]='\0'; 377 } 378 i=PEM_write_bio(bp,name,buf,data,i); 379 if (i <= 0) ret=0; 380err: 381 OPENSSL_cleanse(key,sizeof(key)); 382 OPENSSL_cleanse(iv,sizeof(iv)); 383 OPENSSL_cleanse((char *)&ctx,sizeof(ctx)); 384 OPENSSL_cleanse(buf,PEM_BUFSIZE); 385 if (data != NULL) 386 { 387 OPENSSL_cleanse(data,(unsigned int)dsize); 388 OPENSSL_free(data); 389 } 390 return(ret); 391 } 392 393int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen, 394 pem_password_cb *callback,void *u) 395 { 396 int i=0,j,o,klen; 397 long len; 398 EVP_CIPHER_CTX ctx; 399 unsigned char key[EVP_MAX_KEY_LENGTH]; 400 char buf[PEM_BUFSIZE]; 401 402 len= *plen; 403 404 if (cipher->cipher == NULL) return(1); 405 406 klen = 0; 407 if (!callback) callback = PEM_def_callback; 408 klen=callback(buf,PEM_BUFSIZE,0,u); 409 if (klen <= 0) 410 { 411 OPENSSL_PUT_ERROR(PEM, PEM_do_header, PEM_R_BAD_PASSWORD_READ); 412 return(0); 413 } 414 415 if (!EVP_BytesToKey(cipher->cipher,EVP_md5(),&(cipher->iv[0]), 416 (unsigned char *)buf,klen,1,key,NULL)) 417 return 0; 418 419 j=(int)len; 420 EVP_CIPHER_CTX_init(&ctx); 421 o = EVP_DecryptInit_ex(&ctx,cipher->cipher,NULL, key,&(cipher->iv[0])); 422 if (o) 423 o = EVP_DecryptUpdate(&ctx,data,&i,data,j); 424 if (o) 425 o = EVP_DecryptFinal_ex(&ctx,&(data[i]),&j); 426 EVP_CIPHER_CTX_cleanup(&ctx); 427 OPENSSL_cleanse((char *)buf,sizeof(buf)); 428 OPENSSL_cleanse((char *)key,sizeof(key)); 429 if (!o) 430 { 431 OPENSSL_PUT_ERROR(PEM, PEM_do_header, PEM_R_BAD_DECRYPT); 432 return(0); 433 } 434 j+=i; 435 *plen=j; 436 return(1); 437 } 438 439static const EVP_CIPHER* cipher_by_name(const char *name) { 440 if (strcmp(name, "DES-CBC") == 0) { 441 return EVP_des_cbc(); 442 } else if (strcmp(name, "AES-128-CBC") == 0) { 443 return EVP_aes_128_cbc(); 444 } else if (strcmp(name, "AES-256-CBC") == 0) { 445 return EVP_aes_256_cbc(); 446 } else { 447 return NULL; 448 } 449} 450 451int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher) 452 { 453 const EVP_CIPHER *enc=NULL; 454 char *p,c; 455 char **header_pp = &header; 456 457 cipher->cipher=NULL; 458 if ((header == NULL) || (*header == '\0') || (*header == '\n')) 459 return(1); 460 if (strncmp(header,"Proc-Type: ",11) != 0) 461 { OPENSSL_PUT_ERROR(PEM, PEM_get_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE); return(0); } 462 header+=11; 463 if (*header != '4') return(0); header++; 464 if (*header != ',') return(0); header++; 465 if (strncmp(header,"ENCRYPTED",9) != 0) 466 { OPENSSL_PUT_ERROR(PEM, PEM_get_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED); return(0); } 467 for (; (*header != '\n') && (*header != '\0'); header++) 468 ; 469 if (*header == '\0') 470 { OPENSSL_PUT_ERROR(PEM, PEM_get_EVP_CIPHER_INFO, PEM_R_SHORT_HEADER); return(0); } 471 header++; 472 if (strncmp(header,"DEK-Info: ",10) != 0) 473 { OPENSSL_PUT_ERROR(PEM, PEM_get_EVP_CIPHER_INFO, PEM_R_NOT_DEK_INFO); return(0); } 474 header+=10; 475 476 p=header; 477 for (;;) 478 { 479 c= *header; 480 if (!( ((c >= 'A') && (c <= 'Z')) || (c == '-') || 481 ((c >= '0') && (c <= '9')))) 482 break; 483 header++; 484 } 485 *header='\0'; 486 cipher->cipher=enc=cipher_by_name(p); 487 *header=c; 488 header++; 489 490 if (enc == NULL) 491 { 492 OPENSSL_PUT_ERROR(PEM, PEM_get_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION); 493 return(0); 494 } 495 if (!load_iv(header_pp,&(cipher->iv[0]),EVP_CIPHER_iv_length(enc))) 496 return(0); 497 498 return(1); 499 } 500 501static int load_iv(char **fromp, unsigned char *to, int num) 502 { 503 int v,i; 504 char *from; 505 506 from= *fromp; 507 for (i=0; i<num; i++) to[i]=0; 508 num*=2; 509 for (i=0; i<num; i++) 510 { 511 if ((*from >= '0') && (*from <= '9')) 512 v= *from-'0'; 513 else if ((*from >= 'A') && (*from <= 'F')) 514 v= *from-'A'+10; 515 else if ((*from >= 'a') && (*from <= 'f')) 516 v= *from-'a'+10; 517 else 518 { 519 OPENSSL_PUT_ERROR(PEM, load_iv, PEM_R_BAD_IV_CHARS); 520 return(0); 521 } 522 from++; 523 to[i/2]|=v<<(long)((!(i&1))*4); 524 } 525 526 *fromp=from; 527 return(1); 528 } 529 530#ifndef OPENSSL_NO_FP_API 531int PEM_write(FILE *fp, const char *name, const char *header, 532 const unsigned char *data, long len) 533 { 534 BIO *b; 535 int ret; 536 537 if ((b=BIO_new(BIO_s_file())) == NULL) 538 { 539 OPENSSL_PUT_ERROR(PEM, PEM_write, ERR_R_BUF_LIB); 540 return(0); 541 } 542 BIO_set_fp(b,fp,BIO_NOCLOSE); 543 ret=PEM_write_bio(b, name, header, data,len); 544 BIO_free(b); 545 return(ret); 546 } 547#endif 548 549int PEM_write_bio(BIO *bp, const char *name, const char *header, 550 const unsigned char *data, long len) 551 { 552 int nlen,n,i,j,outl; 553 unsigned char *buf = NULL; 554 EVP_ENCODE_CTX ctx; 555 int reason=ERR_R_BUF_LIB; 556 557 EVP_EncodeInit(&ctx); 558 nlen=strlen(name); 559 560 if ( (BIO_write(bp,"-----BEGIN ",11) != 11) || 561 (BIO_write(bp,name,nlen) != nlen) || 562 (BIO_write(bp,"-----\n",6) != 6)) 563 goto err; 564 565 i=strlen(header); 566 if (i > 0) 567 { 568 if ( (BIO_write(bp,header,i) != i) || 569 (BIO_write(bp,"\n",1) != 1)) 570 goto err; 571 } 572 573 buf = OPENSSL_malloc(PEM_BUFSIZE*8); 574 if (buf == NULL) 575 { 576 reason=ERR_R_MALLOC_FAILURE; 577 goto err; 578 } 579 580 i=j=0; 581 while (len > 0) 582 { 583 n=(int)((len>(PEM_BUFSIZE*5))?(PEM_BUFSIZE*5):len); 584 EVP_EncodeUpdate(&ctx,buf,&outl,&(data[j]),n); 585 if ((outl) && (BIO_write(bp,(char *)buf,outl) != outl)) 586 goto err; 587 i+=outl; 588 len-=n; 589 j+=n; 590 } 591 EVP_EncodeFinal(&ctx,buf,&outl); 592 if ((outl > 0) && (BIO_write(bp,(char *)buf,outl) != outl)) goto err; 593 OPENSSL_cleanse(buf, PEM_BUFSIZE*8); 594 OPENSSL_free(buf); 595 buf = NULL; 596 if ( (BIO_write(bp,"-----END ",9) != 9) || 597 (BIO_write(bp,name,nlen) != nlen) || 598 (BIO_write(bp,"-----\n",6) != 6)) 599 goto err; 600 return(i+outl); 601err: 602 if (buf) { 603 OPENSSL_cleanse(buf, PEM_BUFSIZE*8); 604 OPENSSL_free(buf); 605 } 606 OPENSSL_PUT_ERROR(PEM, PEM_write_bio, reason); 607 return(0); 608 } 609 610#ifndef OPENSSL_NO_FP_API 611int PEM_read(FILE *fp, char **name, char **header, unsigned char **data, 612 long *len) 613 { 614 BIO *b; 615 int ret; 616 617 if ((b=BIO_new(BIO_s_file())) == NULL) 618 { 619 OPENSSL_PUT_ERROR(PEM, PEM_read, ERR_R_BUF_LIB); 620 return(0); 621 } 622 BIO_set_fp(b,fp,BIO_NOCLOSE); 623 ret=PEM_read_bio(b, name, header, data,len); 624 BIO_free(b); 625 return(ret); 626 } 627#endif 628 629int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data, 630 long *len) 631 { 632 EVP_ENCODE_CTX ctx; 633 int end=0,i,k,bl=0,hl=0,nohead=0; 634 char buf[256]; 635 BUF_MEM *nameB; 636 BUF_MEM *headerB; 637 BUF_MEM *dataB,*tmpB; 638 639 nameB=BUF_MEM_new(); 640 headerB=BUF_MEM_new(); 641 dataB=BUF_MEM_new(); 642 if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) 643 { 644 BUF_MEM_free(nameB); 645 BUF_MEM_free(headerB); 646 BUF_MEM_free(dataB); 647 OPENSSL_PUT_ERROR(PEM, PEM_read_bio, ERR_R_MALLOC_FAILURE); 648 return(0); 649 } 650 651 buf[254]='\0'; 652 for (;;) 653 { 654 i=BIO_gets(bp,buf,254); 655 656 if (i <= 0) 657 { 658 OPENSSL_PUT_ERROR(PEM, PEM_read_bio, PEM_R_NO_START_LINE); 659 goto err; 660 } 661 662 while ((i >= 0) && (buf[i] <= ' ')) i--; 663 buf[++i]='\n'; buf[++i]='\0'; 664 665 if (strncmp(buf,"-----BEGIN ",11) == 0) 666 { 667 i=strlen(&(buf[11])); 668 669 if (strncmp(&(buf[11+i-6]),"-----\n",6) != 0) 670 continue; 671 if (!BUF_MEM_grow(nameB,i+9)) 672 { 673 OPENSSL_PUT_ERROR(PEM, PEM_read_bio, ERR_R_MALLOC_FAILURE); 674 goto err; 675 } 676 memcpy(nameB->data,&(buf[11]),i-6); 677 nameB->data[i-6]='\0'; 678 break; 679 } 680 } 681 hl=0; 682 if (!BUF_MEM_grow(headerB,256)) 683 { OPENSSL_PUT_ERROR(PEM, PEM_read_bio, ERR_R_MALLOC_FAILURE); goto err; } 684 headerB->data[0]='\0'; 685 for (;;) 686 { 687 i=BIO_gets(bp,buf,254); 688 if (i <= 0) break; 689 690 while ((i >= 0) && (buf[i] <= ' ')) i--; 691 buf[++i]='\n'; buf[++i]='\0'; 692 693 if (buf[0] == '\n') break; 694 if (!BUF_MEM_grow(headerB,hl+i+9)) 695 { OPENSSL_PUT_ERROR(PEM, PEM_read_bio, ERR_R_MALLOC_FAILURE); goto err; } 696 if (strncmp(buf,"-----END ",9) == 0) 697 { 698 nohead=1; 699 break; 700 } 701 memcpy(&(headerB->data[hl]),buf,i); 702 headerB->data[hl+i]='\0'; 703 hl+=i; 704 } 705 706 bl=0; 707 if (!BUF_MEM_grow(dataB,1024)) 708 { OPENSSL_PUT_ERROR(PEM, PEM_read_bio, ERR_R_MALLOC_FAILURE); goto err; } 709 dataB->data[0]='\0'; 710 if (!nohead) 711 { 712 for (;;) 713 { 714 i=BIO_gets(bp,buf,254); 715 if (i <= 0) break; 716 717 while ((i >= 0) && (buf[i] <= ' ')) i--; 718 buf[++i]='\n'; buf[++i]='\0'; 719 720 if (i != 65) end=1; 721 if (strncmp(buf,"-----END ",9) == 0) 722 break; 723 if (i > 65) break; 724 if (!BUF_MEM_grow_clean(dataB,i+bl+9)) 725 { 726 OPENSSL_PUT_ERROR(PEM, PEM_read_bio, ERR_R_MALLOC_FAILURE); 727 goto err; 728 } 729 memcpy(&(dataB->data[bl]),buf,i); 730 dataB->data[bl+i]='\0'; 731 bl+=i; 732 if (end) 733 { 734 buf[0]='\0'; 735 i=BIO_gets(bp,buf,254); 736 if (i <= 0) break; 737 738 while ((i >= 0) && (buf[i] <= ' ')) i--; 739 buf[++i]='\n'; buf[++i]='\0'; 740 741 break; 742 } 743 } 744 } 745 else 746 { 747 tmpB=headerB; 748 headerB=dataB; 749 dataB=tmpB; 750 bl=hl; 751 } 752 i=strlen(nameB->data); 753 if ( (strncmp(buf,"-----END ",9) != 0) || 754 (strncmp(nameB->data,&(buf[9]),i) != 0) || 755 (strncmp(&(buf[9+i]),"-----\n",6) != 0)) 756 { 757 OPENSSL_PUT_ERROR(PEM, PEM_read_bio, PEM_R_BAD_END_LINE); 758 goto err; 759 } 760 761 EVP_DecodeInit(&ctx); 762 i=EVP_DecodeUpdate(&ctx, 763 (unsigned char *)dataB->data,&bl, 764 (unsigned char *)dataB->data,bl); 765 if (i < 0) 766 { 767 OPENSSL_PUT_ERROR(PEM, PEM_read_bio, PEM_R_BAD_BASE64_DECODE); 768 goto err; 769 } 770 i=EVP_DecodeFinal(&ctx,(unsigned char *)&(dataB->data[bl]),&k); 771 if (i < 0) 772 { 773 OPENSSL_PUT_ERROR(PEM, PEM_read_bio, PEM_R_BAD_BASE64_DECODE); 774 goto err; 775 } 776 bl+=k; 777 778 if (bl == 0) goto err; 779 *name=nameB->data; 780 *header=headerB->data; 781 *data=(unsigned char *)dataB->data; 782 *len=bl; 783 OPENSSL_free(nameB); 784 OPENSSL_free(headerB); 785 OPENSSL_free(dataB); 786 return(1); 787err: 788 BUF_MEM_free(nameB); 789 BUF_MEM_free(headerB); 790 BUF_MEM_free(dataB); 791 return(0); 792 } 793 794/* Check pem string and return prefix length. 795 * If for example the pem_str == "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" 796 * the return value is 3 for the string "RSA". 797 */ 798 799int pem_check_suffix(const char *pem_str, const char *suffix) 800 { 801 int pem_len = strlen(pem_str); 802 int suffix_len = strlen(suffix); 803 const char *p; 804 if (suffix_len + 1 >= pem_len) 805 return 0; 806 p = pem_str + pem_len - suffix_len; 807 if (strcmp(p, suffix)) 808 return 0; 809 p--; 810 if (*p != ' ') 811 return 0; 812 return p - pem_str; 813 } 814 815int PEM_def_callback(char *buf, int size, int rwflag, void *userdata) 816 { 817 if (!buf || !userdata) 818 { 819 return 0; 820 } 821 size_t len = strlen((char *) userdata); 822 if (len >= (size_t) size) 823 { 824 return 0; 825 } 826 strcpy(buf, (char *) userdata); 827 return len; 828 } 829