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pem_lib.c
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1 /* crypto/pem/pem_lib.c */
2 /* Copyright (C) 1995-1998 Eric Young ([email protected])
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young ([email protected]).
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 ([email protected]).
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 ([email protected])"
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 ([email protected])"
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 
59 #include <stdio.h>
60 #include <ctype.h>
61 #include "cryptlib.h"
62 #include <openssl/buffer.h>
63 #include <openssl/objects.h>
64 #include <openssl/evp.h>
65 #include <openssl/rand.h>
66 #include <openssl/x509.h>
67 #include <openssl/pem.h>
68 #include <openssl/pkcs12.h>
69 #include "asn1_locl.h"
70 #ifndef OPENSSL_NO_DES
71 #include <openssl/des.h>
72 #endif
73 #ifndef OPENSSL_NO_ENGINE
74 #include <openssl/engine.h>
75 #endif
76 
77 const char PEM_version[]="PEM" OPENSSL_VERSION_PTEXT;
78 
79 #define MIN_LENGTH 4
80 
81 static int load_iv(char **fromp,unsigned char *to, int num);
82 static int check_pem(const char *nm, const char *name);
83 int pem_check_suffix(const char *pem_str, const char *suffix);
84 
85 int PEM_def_callback(char *buf, int num, int w, void *key)
86  {
87 #ifdef OPENSSL_NO_FP_API
88  /* We should not ever call the default callback routine from
89  * windows. */
90  PEMerr(PEM_F_PEM_DEF_CALLBACK,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
91  return(-1);
92 #else
93  int i,j;
94  const char *prompt;
95  if(key) {
96  i=strlen(key);
97  i=(i > num)?num:i;
98  memcpy(buf,key,i);
99  return(i);
100  }
101 
102  prompt=EVP_get_pw_prompt();
103  if (prompt == NULL)
104  prompt="Enter PEM pass phrase:";
105 
106  for (;;)
107  {
108  i=EVP_read_pw_string_min(buf,MIN_LENGTH,num,prompt,w);
109  if (i != 0)
110  {
111  PEMerr(PEM_F_PEM_DEF_CALLBACK,PEM_R_PROBLEMS_GETTING_PASSWORD);
112  memset(buf,0,(unsigned int)num);
113  return(-1);
114  }
115  j=strlen(buf);
116  if (j < MIN_LENGTH)
117  {
118  fprintf(stderr,"phrase is too short, needs to be at least %d chars\n",MIN_LENGTH);
119  }
120  else
121  break;
122  }
123  return(j);
124 #endif
125  }
126 
127 void PEM_proc_type(char *buf, int type)
128  {
129  const char *str;
130 
131  if (type == PEM_TYPE_ENCRYPTED)
132  str="ENCRYPTED";
133  else if (type == PEM_TYPE_MIC_CLEAR)
134  str="MIC-CLEAR";
135  else if (type == PEM_TYPE_MIC_ONLY)
136  str="MIC-ONLY";
137  else
138  str="BAD-TYPE";
139 
140  BUF_strlcat(buf,"Proc-Type: 4,",PEM_BUFSIZE);
141  BUF_strlcat(buf,str,PEM_BUFSIZE);
142  BUF_strlcat(buf,"\n",PEM_BUFSIZE);
143  }
144 
145 void PEM_dek_info(char *buf, const char *type, int len, char *str)
146  {
147  static const unsigned char map[17]="0123456789ABCDEF";
148  long i;
149  int j;
150 
151  BUF_strlcat(buf,"DEK-Info: ",PEM_BUFSIZE);
152  BUF_strlcat(buf,type,PEM_BUFSIZE);
153  BUF_strlcat(buf,",",PEM_BUFSIZE);
154  j=strlen(buf);
155  if (j + (len * 2) + 1 > PEM_BUFSIZE)
156  return;
157  for (i=0; i<len; i++)
158  {
159  buf[j+i*2] =map[(str[i]>>4)&0x0f];
160  buf[j+i*2+1]=map[(str[i] )&0x0f];
161  }
162  buf[j+i*2]='\n';
163  buf[j+i*2+1]='\0';
164  }
165 
166 #ifndef OPENSSL_NO_FP_API
167 void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
168  pem_password_cb *cb, void *u)
169  {
170  BIO *b;
171  void *ret;
172 
173  if ((b=BIO_new(BIO_s_file())) == NULL)
174  {
175  PEMerr(PEM_F_PEM_ASN1_READ,ERR_R_BUF_LIB);
176  return(0);
177  }
178  BIO_set_fp(b,fp,BIO_NOCLOSE);
179  ret=PEM_ASN1_read_bio(d2i,name,b,x,cb,u);
180  BIO_free(b);
181  return(ret);
182  }
183 #endif
184 
185 static int check_pem(const char *nm, const char *name)
186 {
187  /* Normal matching nm and name */
188  if (!strcmp(nm,name)) return 1;
189 
190  /* Make PEM_STRING_EVP_PKEY match any private key */
191 
192  if(!strcmp(name,PEM_STRING_EVP_PKEY))
193  {
194  int slen;
195  const EVP_PKEY_ASN1_METHOD *ameth;
196  if(!strcmp(nm,PEM_STRING_PKCS8))
197  return 1;
198  if(!strcmp(nm,PEM_STRING_PKCS8INF))
199  return 1;
200  slen = pem_check_suffix(nm, "PRIVATE KEY");
201  if (slen > 0)
202  {
203  /* NB: ENGINE implementations wont contain
204  * a deprecated old private key decode function
205  * so don't look for them.
206  */
207  ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
208  if (ameth && ameth->old_priv_decode)
209  return 1;
210  }
211  return 0;
212  }
213 
214  if(!strcmp(name,PEM_STRING_PARAMETERS))
215  {
216  int slen;
217  const EVP_PKEY_ASN1_METHOD *ameth;
218  slen = pem_check_suffix(nm, "PARAMETERS");
219  if (slen > 0)
220  {
221  ENGINE *e;
222  ameth = EVP_PKEY_asn1_find_str(&e, nm, slen);
223  if (ameth)
224  {
225  int r;
226  if (ameth->param_decode)
227  r = 1;
228  else
229  r = 0;
230 #ifndef OPENSSL_NO_ENGINE
231  if (e)
232  ENGINE_finish(e);
233 #endif
234  return r;
235  }
236  }
237  return 0;
238  }
239 
240  /* Permit older strings */
241 
242  if(!strcmp(nm,PEM_STRING_X509_OLD) &&
243  !strcmp(name,PEM_STRING_X509)) return 1;
244 
245  if(!strcmp(nm,PEM_STRING_X509_REQ_OLD) &&
246  !strcmp(name,PEM_STRING_X509_REQ)) return 1;
247 
248  /* Allow normal certs to be read as trusted certs */
249  if(!strcmp(nm,PEM_STRING_X509) &&
250  !strcmp(name,PEM_STRING_X509_TRUSTED)) return 1;
251 
252  if(!strcmp(nm,PEM_STRING_X509_OLD) &&
253  !strcmp(name,PEM_STRING_X509_TRUSTED)) return 1;
254 
255  /* Some CAs use PKCS#7 with CERTIFICATE headers */
256  if(!strcmp(nm, PEM_STRING_X509) &&
257  !strcmp(name, PEM_STRING_PKCS7)) return 1;
258 
259  if(!strcmp(nm, PEM_STRING_PKCS7_SIGNED) &&
260  !strcmp(name, PEM_STRING_PKCS7)) return 1;
261 
262 #ifndef OPENSSL_NO_CMS
263  if(!strcmp(nm, PEM_STRING_X509) &&
264  !strcmp(name, PEM_STRING_CMS)) return 1;
265  /* Allow CMS to be read from PKCS#7 headers */
266  if(!strcmp(nm, PEM_STRING_PKCS7) &&
267  !strcmp(name, PEM_STRING_CMS)) return 1;
268 #endif
269 
270  return 0;
271 }
272 
273 int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm, const char *name, BIO *bp,
274  pem_password_cb *cb, void *u)
275  {
276  EVP_CIPHER_INFO cipher;
277  char *nm=NULL,*header=NULL;
278  unsigned char *data=NULL;
279  long len;
280  int ret = 0;
281 
282  for (;;)
283  {
284  if (!PEM_read_bio(bp,&nm,&header,&data,&len)) {
285  if(ERR_GET_REASON(ERR_peek_error()) ==
286  PEM_R_NO_START_LINE)
287  ERR_add_error_data(2, "Expecting: ", name);
288  return 0;
289  }
290  if(check_pem(nm, name)) break;
291  OPENSSL_free(nm);
292  OPENSSL_free(header);
293  OPENSSL_free(data);
294  }
295  if (!PEM_get_EVP_CIPHER_INFO(header,&cipher)) goto err;
296  if (!PEM_do_header(&cipher,data,&len,cb,u)) goto err;
297 
298  *pdata = data;
299  *plen = len;
300 
301  if (pnm)
302  *pnm = nm;
303 
304  ret = 1;
305 
306 err:
307  if (!ret || !pnm) OPENSSL_free(nm);
308  OPENSSL_free(header);
309  if (!ret) OPENSSL_free(data);
310  return ret;
311  }
312 
313 #ifndef OPENSSL_NO_FP_API
314 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
315  void *x, const EVP_CIPHER *enc, unsigned char *kstr,
316  int klen, pem_password_cb *callback, void *u)
317  {
318  BIO *b;
319  int ret;
320 
321  if ((b=BIO_new(BIO_s_file())) == NULL)
322  {
323  PEMerr(PEM_F_PEM_ASN1_WRITE,ERR_R_BUF_LIB);
324  return(0);
325  }
326  BIO_set_fp(b,fp,BIO_NOCLOSE);
327  ret=PEM_ASN1_write_bio(i2d,name,b,x,enc,kstr,klen,callback,u);
328  BIO_free(b);
329  return(ret);
330  }
331 #endif
332 
333 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
334  void *x, const EVP_CIPHER *enc, unsigned char *kstr,
335  int klen, pem_password_cb *callback, void *u)
336  {
337  EVP_CIPHER_CTX ctx;
338  int dsize=0,i,j,ret=0;
339  unsigned char *p,*data=NULL;
340  const char *objstr=NULL;
341  char buf[PEM_BUFSIZE];
342  unsigned char key[EVP_MAX_KEY_LENGTH];
343  unsigned char iv[EVP_MAX_IV_LENGTH];
344 
345  if (enc != NULL)
346  {
347  objstr=OBJ_nid2sn(EVP_CIPHER_nid(enc));
348  if (objstr == NULL)
349  {
350  PEMerr(PEM_F_PEM_ASN1_WRITE_BIO,PEM_R_UNSUPPORTED_CIPHER);
351  goto err;
352  }
353  }
354 
355  if ((dsize=i2d(x,NULL)) < 0)
356  {
357  PEMerr(PEM_F_PEM_ASN1_WRITE_BIO,ERR_R_ASN1_LIB);
358  dsize=0;
359  goto err;
360  }
361  /* dzise + 8 bytes are needed */
362  /* actually it needs the cipher block size extra... */
363  data=(unsigned char *)OPENSSL_malloc((unsigned int)dsize+20);
364  if (data == NULL)
365  {
366  PEMerr(PEM_F_PEM_ASN1_WRITE_BIO,ERR_R_MALLOC_FAILURE);
367  goto err;
368  }
369  p=data;
370  i=i2d(x,&p);
371 
372  if (enc != NULL)
373  {
374  if (kstr == NULL)
375  {
376  if (callback == NULL)
377  klen=PEM_def_callback(buf,PEM_BUFSIZE,1,u);
378  else
379  klen=(*callback)(buf,PEM_BUFSIZE,1,u);
380  if (klen <= 0)
381  {
382  PEMerr(PEM_F_PEM_ASN1_WRITE_BIO,PEM_R_READ_KEY);
383  goto err;
384  }
385 #ifdef CHARSET_EBCDIC
386  /* Convert the pass phrase from EBCDIC */
387  ebcdic2ascii(buf, buf, klen);
388 #endif
389  kstr=(unsigned char *)buf;
390  }
391  RAND_add(data,i,0);/* put in the RSA key. */
392  OPENSSL_assert(enc->iv_len <= (int)sizeof(iv));
393  if (RAND_pseudo_bytes(iv,enc->iv_len) < 0) /* Generate a salt */
394  goto err;
395  /* The 'iv' is used as the iv and as a salt. It is
396  * NOT taken from the BytesToKey function */
397  EVP_BytesToKey(enc,EVP_md5(),iv,kstr,klen,1,key,NULL);
398 
399  if (kstr == (unsigned char *)buf) OPENSSL_cleanse(buf,PEM_BUFSIZE);
400 
401  OPENSSL_assert(strlen(objstr)+23+2*enc->iv_len+13 <= sizeof buf);
402 
403  buf[0]='\0';
404  PEM_proc_type(buf,PEM_TYPE_ENCRYPTED);
405  PEM_dek_info(buf,objstr,enc->iv_len,(char *)iv);
406  /* k=strlen(buf); */
407 
408  EVP_CIPHER_CTX_init(&ctx);
409  EVP_EncryptInit_ex(&ctx,enc,NULL,key,iv);
410  EVP_EncryptUpdate(&ctx,data,&j,data,i);
411  EVP_EncryptFinal_ex(&ctx,&(data[j]),&i);
412  EVP_CIPHER_CTX_cleanup(&ctx);
413  i+=j;
414  ret=1;
415  }
416  else
417  {
418  ret=1;
419  buf[0]='\0';
420  }
421  i=PEM_write_bio(bp,name,buf,data,i);
422  if (i <= 0) ret=0;
423 err:
424  OPENSSL_cleanse(key,sizeof(key));
425  OPENSSL_cleanse(iv,sizeof(iv));
426  OPENSSL_cleanse((char *)&ctx,sizeof(ctx));
427  OPENSSL_cleanse(buf,PEM_BUFSIZE);
428  if (data != NULL)
429  {
430  OPENSSL_cleanse(data,(unsigned int)dsize);
431  OPENSSL_free(data);
432  }
433  return(ret);
434  }
435 
436 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
437  pem_password_cb *callback,void *u)
438  {
439  int i,j,o,klen;
440  long len;
441  EVP_CIPHER_CTX ctx;
442  unsigned char key[EVP_MAX_KEY_LENGTH];
443  char buf[PEM_BUFSIZE];
444 
445  len= *plen;
446 
447  if (cipher->cipher == NULL) return(1);
448  if (callback == NULL)
449  klen=PEM_def_callback(buf,PEM_BUFSIZE,0,u);
450  else
451  klen=callback(buf,PEM_BUFSIZE,0,u);
452  if (klen <= 0)
453  {
454  PEMerr(PEM_F_PEM_DO_HEADER,PEM_R_BAD_PASSWORD_READ);
455  return(0);
456  }
457 #ifdef CHARSET_EBCDIC
458  /* Convert the pass phrase from EBCDIC */
459  ebcdic2ascii(buf, buf, klen);
460 #endif
461 
462  EVP_BytesToKey(cipher->cipher,EVP_md5(),&(cipher->iv[0]),
463  (unsigned char *)buf,klen,1,key,NULL);
464 
465  j=(int)len;
466  EVP_CIPHER_CTX_init(&ctx);
467  EVP_DecryptInit_ex(&ctx,cipher->cipher,NULL, key,&(cipher->iv[0]));
468  EVP_DecryptUpdate(&ctx,data,&i,data,j);
469  o=EVP_DecryptFinal_ex(&ctx,&(data[i]),&j);
470  EVP_CIPHER_CTX_cleanup(&ctx);
471  OPENSSL_cleanse((char *)buf,sizeof(buf));
472  OPENSSL_cleanse((char *)key,sizeof(key));
473  j+=i;
474  if (!o)
475  {
476  PEMerr(PEM_F_PEM_DO_HEADER,PEM_R_BAD_DECRYPT);
477  return(0);
478  }
479  *plen=j;
480  return(1);
481  }
482 
483 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
484  {
485  const EVP_CIPHER *enc=NULL;
486  char *p,c;
487  char **header_pp = &header;
488 
489  cipher->cipher=NULL;
490  if ((header == NULL) || (*header == '\0') || (*header == '\n'))
491  return(1);
492  if (strncmp(header,"Proc-Type: ",11) != 0)
493  { PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO,PEM_R_NOT_PROC_TYPE); return(0); }
494  header+=11;
495  if (*header != '4') return(0); header++;
496  if (*header != ',') return(0); header++;
497  if (strncmp(header,"ENCRYPTED",9) != 0)
498  { PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO,PEM_R_NOT_ENCRYPTED); return(0); }
499  for (; (*header != '\n') && (*header != '\0'); header++)
500  ;
501  if (*header == '\0')
502  { PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO,PEM_R_SHORT_HEADER); return(0); }
503  header++;
504  if (strncmp(header,"DEK-Info: ",10) != 0)
505  { PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO,PEM_R_NOT_DEK_INFO); return(0); }
506  header+=10;
507 
508  p=header;
509  for (;;)
510  {
511  c= *header;
512 #ifndef CHARSET_EBCDIC
513  if (!( ((c >= 'A') && (c <= 'Z')) || (c == '-') ||
514  ((c >= '0') && (c <= '9'))))
515  break;
516 #else
517  if (!( isupper(c) || (c == '-') ||
518  isdigit(c)))
519  break;
520 #endif
521  header++;
522  }
523  *header='\0';
524  cipher->cipher=enc=EVP_get_cipherbyname(p);
525  *header=c;
526  header++;
527 
528  if (enc == NULL)
529  {
530  PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO,PEM_R_UNSUPPORTED_ENCRYPTION);
531  return(0);
532  }
533  if (!load_iv(header_pp,&(cipher->iv[0]),enc->iv_len))
534  return(0);
535 
536  return(1);
537  }
538 
539 static int load_iv(char **fromp, unsigned char *to, int num)
540  {
541  int v,i;
542  char *from;
543 
544  from= *fromp;
545  for (i=0; i<num; i++) to[i]=0;
546  num*=2;
547  for (i=0; i<num; i++)
548  {
549  if ((*from >= '0') && (*from <= '9'))
550  v= *from-'0';
551  else if ((*from >= 'A') && (*from <= 'F'))
552  v= *from-'A'+10;
553  else if ((*from >= 'a') && (*from <= 'f'))
554  v= *from-'a'+10;
555  else
556  {
557  PEMerr(PEM_F_LOAD_IV,PEM_R_BAD_IV_CHARS);
558  return(0);
559  }
560  from++;
561  to[i/2]|=v<<(long)((!(i&1))*4);
562  }
563 
564  *fromp=from;
565  return(1);
566  }
567 
568 #ifndef OPENSSL_NO_FP_API
569 int PEM_write(FILE *fp, char *name, char *header, unsigned char *data,
570  long len)
571  {
572  BIO *b;
573  int ret;
574 
575  if ((b=BIO_new(BIO_s_file())) == NULL)
576  {
577  PEMerr(PEM_F_PEM_WRITE,ERR_R_BUF_LIB);
578  return(0);
579  }
580  BIO_set_fp(b,fp,BIO_NOCLOSE);
581  ret=PEM_write_bio(b, name, header, data,len);
582  BIO_free(b);
583  return(ret);
584  }
585 #endif
586 
587 int PEM_write_bio(BIO *bp, const char *name, char *header, unsigned char *data,
588  long len)
589  {
590  int nlen,n,i,j,outl;
591  unsigned char *buf = NULL;
592  EVP_ENCODE_CTX ctx;
593  int reason=ERR_R_BUF_LIB;
594 
595  EVP_EncodeInit(&ctx);
596  nlen=strlen(name);
597 
598  if ( (BIO_write(bp,"-----BEGIN ",11) != 11) ||
599  (BIO_write(bp,name,nlen) != nlen) ||
600  (BIO_write(bp,"-----\n",6) != 6))
601  goto err;
602 
603  i=strlen(header);
604  if (i > 0)
605  {
606  if ( (BIO_write(bp,header,i) != i) ||
607  (BIO_write(bp,"\n",1) != 1))
608  goto err;
609  }
610 
611  buf = OPENSSL_malloc(PEM_BUFSIZE*8);
612  if (buf == NULL)
613  {
614  reason=ERR_R_MALLOC_FAILURE;
615  goto err;
616  }
617 
618  i=j=0;
619  while (len > 0)
620  {
621  n=(int)((len>(PEM_BUFSIZE*5))?(PEM_BUFSIZE*5):len);
622  EVP_EncodeUpdate(&ctx,buf,&outl,&(data[j]),n);
623  if ((outl) && (BIO_write(bp,(char *)buf,outl) != outl))
624  goto err;
625  i+=outl;
626  len-=n;
627  j+=n;
628  }
629  EVP_EncodeFinal(&ctx,buf,&outl);
630  if ((outl > 0) && (BIO_write(bp,(char *)buf,outl) != outl)) goto err;
631  OPENSSL_cleanse(buf, PEM_BUFSIZE*8);
632  OPENSSL_free(buf);
633  buf = NULL;
634  if ( (BIO_write(bp,"-----END ",9) != 9) ||
635  (BIO_write(bp,name,nlen) != nlen) ||
636  (BIO_write(bp,"-----\n",6) != 6))
637  goto err;
638  return(i+outl);
639 err:
640  if (buf) {
641  OPENSSL_cleanse(buf, PEM_BUFSIZE*8);
642  OPENSSL_free(buf);
643  }
644  PEMerr(PEM_F_PEM_WRITE_BIO,reason);
645  return(0);
646  }
647 
648 #ifndef OPENSSL_NO_FP_API
649 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
650  long *len)
651  {
652  BIO *b;
653  int ret;
654 
655  if ((b=BIO_new(BIO_s_file())) == NULL)
656  {
657  PEMerr(PEM_F_PEM_READ,ERR_R_BUF_LIB);
658  return(0);
659  }
660  BIO_set_fp(b,fp,BIO_NOCLOSE);
661  ret=PEM_read_bio(b, name, header, data,len);
662  BIO_free(b);
663  return(ret);
664  }
665 #endif
666 
667 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
668  long *len)
669  {
670  EVP_ENCODE_CTX ctx;
671  int end=0,i,k,bl=0,hl=0,nohead=0;
672  char buf[256];
673  BUF_MEM *nameB;
674  BUF_MEM *headerB;
675  BUF_MEM *dataB,*tmpB;
676 
677  nameB=BUF_MEM_new();
678  headerB=BUF_MEM_new();
679  dataB=BUF_MEM_new();
680  if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL))
681  {
682  BUF_MEM_free(nameB);
683  BUF_MEM_free(headerB);
684  BUF_MEM_free(dataB);
685  PEMerr(PEM_F_PEM_READ_BIO,ERR_R_MALLOC_FAILURE);
686  return(0);
687  }
688 
689  buf[254]='\0';
690  for (;;)
691  {
692  i=BIO_gets(bp,buf,254);
693 
694  if (i <= 0)
695  {
696  PEMerr(PEM_F_PEM_READ_BIO,PEM_R_NO_START_LINE);
697  goto err;
698  }
699 
700  while ((i >= 0) && (buf[i] <= ' ')) i--;
701  buf[++i]='\n'; buf[++i]='\0';
702 
703  if (strncmp(buf,"-----BEGIN ",11) == 0)
704  {
705  i=strlen(&(buf[11]));
706 
707  if (strncmp(&(buf[11+i-6]),"-----\n",6) != 0)
708  continue;
709  if (!BUF_MEM_grow(nameB,i+9))
710  {
711  PEMerr(PEM_F_PEM_READ_BIO,ERR_R_MALLOC_FAILURE);
712  goto err;
713  }
714  memcpy(nameB->data,&(buf[11]),i-6);
715  nameB->data[i-6]='\0';
716  break;
717  }
718  }
719  hl=0;
720  if (!BUF_MEM_grow(headerB,256))
721  { PEMerr(PEM_F_PEM_READ_BIO,ERR_R_MALLOC_FAILURE); goto err; }
722  headerB->data[0]='\0';
723  for (;;)
724  {
725  i=BIO_gets(bp,buf,254);
726  if (i <= 0) break;
727 
728  while ((i >= 0) && (buf[i] <= ' ')) i--;
729  buf[++i]='\n'; buf[++i]='\0';
730 
731  if (buf[0] == '\n') break;
732  if (!BUF_MEM_grow(headerB,hl+i+9))
733  { PEMerr(PEM_F_PEM_READ_BIO,ERR_R_MALLOC_FAILURE); goto err; }
734  if (strncmp(buf,"-----END ",9) == 0)
735  {
736  nohead=1;
737  break;
738  }
739  memcpy(&(headerB->data[hl]),buf,i);
740  headerB->data[hl+i]='\0';
741  hl+=i;
742  }
743 
744  bl=0;
745  if (!BUF_MEM_grow(dataB,1024))
746  { PEMerr(PEM_F_PEM_READ_BIO,ERR_R_MALLOC_FAILURE); goto err; }
747  dataB->data[0]='\0';
748  if (!nohead)
749  {
750  for (;;)
751  {
752  i=BIO_gets(bp,buf,254);
753  if (i <= 0) break;
754 
755  while ((i >= 0) && (buf[i] <= ' ')) i--;
756  buf[++i]='\n'; buf[++i]='\0';
757 
758  if (i != 65) end=1;
759  if (strncmp(buf,"-----END ",9) == 0)
760  break;
761  if (i > 65) break;
762  if (!BUF_MEM_grow_clean(dataB,i+bl+9))
763  {
764  PEMerr(PEM_F_PEM_READ_BIO,ERR_R_MALLOC_FAILURE);
765  goto err;
766  }
767  memcpy(&(dataB->data[bl]),buf,i);
768  dataB->data[bl+i]='\0';
769  bl+=i;
770  if (end)
771  {
772  buf[0]='\0';
773  i=BIO_gets(bp,buf,254);
774  if (i <= 0) break;
775 
776  while ((i >= 0) && (buf[i] <= ' ')) i--;
777  buf[++i]='\n'; buf[++i]='\0';
778 
779  break;
780  }
781  }
782  }
783  else
784  {
785  tmpB=headerB;
786  headerB=dataB;
787  dataB=tmpB;
788  bl=hl;
789  }
790  i=strlen(nameB->data);
791  if ( (strncmp(buf,"-----END ",9) != 0) ||
792  (strncmp(nameB->data,&(buf[9]),i) != 0) ||
793  (strncmp(&(buf[9+i]),"-----\n",6) != 0))
794  {
795  PEMerr(PEM_F_PEM_READ_BIO,PEM_R_BAD_END_LINE);
796  goto err;
797  }
798 
799  EVP_DecodeInit(&ctx);
800  i=EVP_DecodeUpdate(&ctx,
801  (unsigned char *)dataB->data,&bl,
802  (unsigned char *)dataB->data,bl);
803  if (i < 0)
804  {
805  PEMerr(PEM_F_PEM_READ_BIO,PEM_R_BAD_BASE64_DECODE);
806  goto err;
807  }
808  i=EVP_DecodeFinal(&ctx,(unsigned char *)&(dataB->data[bl]),&k);
809  if (i < 0)
810  {
811  PEMerr(PEM_F_PEM_READ_BIO,PEM_R_BAD_BASE64_DECODE);
812  goto err;
813  }
814  bl+=k;
815 
816  if (bl == 0) goto err;
817  *name=nameB->data;
818  *header=headerB->data;
819  *data=(unsigned char *)dataB->data;
820  *len=bl;
821  OPENSSL_free(nameB);
822  OPENSSL_free(headerB);
823  OPENSSL_free(dataB);
824  return(1);
825 err:
826  BUF_MEM_free(nameB);
827  BUF_MEM_free(headerB);
828  BUF_MEM_free(dataB);
829  return(0);
830  }
831 
832 /* Check pem string and return prefix length.
833  * If for example the pem_str == "RSA PRIVATE KEY" and suffix = "PRIVATE KEY"
834  * the return value is 3 for the string "RSA".
835  */
836 
837 int pem_check_suffix(const char *pem_str, const char *suffix)
838  {
839  int pem_len = strlen(pem_str);
840  int suffix_len = strlen(suffix);
841  const char *p;
842  if (suffix_len + 1 >= pem_len)
843  return 0;
844  p = pem_str + pem_len - suffix_len;
845  if (strcmp(p, suffix))
846  return 0;
847  p--;
848  if (*p != ' ')
849  return 0;
850  return p - pem_str;
851  }
852 
Generated on Thu Jan 10 2013 09:53:38 for OpenSSL by   doxygen 1.8.2