• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 "../internal.h"
75 
76 
77 #define MIN_LENGTH      4
78 
79 static int load_iv(char **fromp, unsigned char *to, int num);
80 static int check_pem(const char *nm, const char *name);
81 
PEM_proc_type(char * buf,int type)82 void PEM_proc_type(char *buf, int type)
83 {
84     const char *str;
85 
86     if (type == PEM_TYPE_ENCRYPTED)
87         str = "ENCRYPTED";
88     else if (type == PEM_TYPE_MIC_CLEAR)
89         str = "MIC-CLEAR";
90     else if (type == PEM_TYPE_MIC_ONLY)
91         str = "MIC-ONLY";
92     else
93         str = "BAD-TYPE";
94 
95     BUF_strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE);
96     BUF_strlcat(buf, str, PEM_BUFSIZE);
97     BUF_strlcat(buf, "\n", PEM_BUFSIZE);
98 }
99 
PEM_dek_info(char * buf,const char * type,int len,char * str)100 void PEM_dek_info(char *buf, const char *type, int len, char *str)
101 {
102     static const unsigned char map[17] = "0123456789ABCDEF";
103     long i;
104     int j;
105 
106     BUF_strlcat(buf, "DEK-Info: ", PEM_BUFSIZE);
107     BUF_strlcat(buf, type, PEM_BUFSIZE);
108     BUF_strlcat(buf, ",", PEM_BUFSIZE);
109     j = strlen(buf);
110     if (j + (len * 2) + 1 > PEM_BUFSIZE)
111         return;
112     for (i = 0; i < len; i++) {
113         buf[j + i * 2] = map[(str[i] >> 4) & 0x0f];
114         buf[j + i * 2 + 1] = map[(str[i]) & 0x0f];
115     }
116     buf[j + i * 2] = '\n';
117     buf[j + i * 2 + 1] = '\0';
118 }
119 
120 #ifndef OPENSSL_NO_FP_API
PEM_ASN1_read(d2i_of_void * d2i,const char * name,FILE * fp,void ** x,pem_password_cb * cb,void * u)121 void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
122                     pem_password_cb *cb, void *u)
123 {
124     BIO *b = BIO_new_fp(fp, BIO_NOCLOSE);
125     if (b == NULL) {
126         OPENSSL_PUT_ERROR(PEM, ERR_R_BUF_LIB);
127         return NULL;
128     }
129     void *ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
130     BIO_free(b);
131     return ret;
132 }
133 #endif
134 
check_pem(const char * nm,const char * name)135 static int check_pem(const char *nm, const char *name)
136 {
137     /* Normal matching nm and name */
138     if (!strcmp(nm, name))
139         return 1;
140 
141     /* Make PEM_STRING_EVP_PKEY match any private key */
142 
143     if (!strcmp(name, PEM_STRING_EVP_PKEY)) {
144         return !strcmp(nm, PEM_STRING_PKCS8) ||
145                !strcmp(nm, PEM_STRING_PKCS8INF) ||
146                !strcmp(nm, PEM_STRING_RSA) ||
147                !strcmp(nm, PEM_STRING_EC) ||
148                !strcmp(nm, PEM_STRING_DSA);
149     }
150 
151     /* Permit older strings */
152 
153     if (!strcmp(nm, PEM_STRING_X509_OLD) && !strcmp(name, PEM_STRING_X509))
154         return 1;
155 
156     if (!strcmp(nm, PEM_STRING_X509_REQ_OLD) &&
157         !strcmp(name, PEM_STRING_X509_REQ))
158         return 1;
159 
160     /* Allow normal certs to be read as trusted certs */
161     if (!strcmp(nm, PEM_STRING_X509) &&
162         !strcmp(name, PEM_STRING_X509_TRUSTED))
163         return 1;
164 
165     if (!strcmp(nm, PEM_STRING_X509_OLD) &&
166         !strcmp(name, PEM_STRING_X509_TRUSTED))
167         return 1;
168 
169     /* Some CAs use PKCS#7 with CERTIFICATE headers */
170     if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_PKCS7))
171         return 1;
172 
173     if (!strcmp(nm, PEM_STRING_PKCS7_SIGNED) &&
174         !strcmp(name, PEM_STRING_PKCS7))
175         return 1;
176 
177 #ifndef OPENSSL_NO_CMS
178     if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_CMS))
179         return 1;
180     /* Allow CMS to be read from PKCS#7 headers */
181     if (!strcmp(nm, PEM_STRING_PKCS7) && !strcmp(name, PEM_STRING_CMS))
182         return 1;
183 #endif
184 
185     return 0;
186 }
187 
cipher_by_name(const char * name)188 static const EVP_CIPHER *cipher_by_name(const char *name)
189 {
190     /* This is similar to the (deprecated) function |EVP_get_cipherbyname|. Note
191      * the PEM code assumes that ciphers have at least 8 bytes of IV, at most 20
192      * bytes of overhead and generally behave like CBC mode. */
193     if (0 == strcmp(name, SN_des_cbc)) {
194         return EVP_des_cbc();
195     } else if (0 == strcmp(name, SN_des_ede3_cbc)) {
196         return EVP_des_ede3_cbc();
197     } else if (0 == strcmp(name, SN_aes_128_cbc)) {
198         return EVP_aes_128_cbc();
199     } else if (0 == strcmp(name, SN_aes_192_cbc)) {
200         return EVP_aes_192_cbc();
201     } else if (0 == strcmp(name, SN_aes_256_cbc)) {
202         return EVP_aes_256_cbc();
203     } else {
204         return NULL;
205     }
206 }
207 
PEM_bytes_read_bio(unsigned char ** pdata,long * plen,char ** pnm,const char * name,BIO * bp,pem_password_cb * cb,void * u)208 int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
209                        const char *name, BIO *bp, pem_password_cb *cb,
210                        void *u)
211 {
212     EVP_CIPHER_INFO cipher;
213     char *nm = NULL, *header = NULL;
214     unsigned char *data = NULL;
215     long len;
216     int ret = 0;
217 
218     for (;;) {
219         if (!PEM_read_bio(bp, &nm, &header, &data, &len)) {
220             uint32_t error = ERR_peek_error();
221             if (ERR_GET_LIB(error) == ERR_LIB_PEM &&
222                 ERR_GET_REASON(error) == PEM_R_NO_START_LINE) {
223                 ERR_add_error_data(2, "Expecting: ", name);
224             }
225             return 0;
226         }
227         if (check_pem(nm, name))
228             break;
229         OPENSSL_free(nm);
230         OPENSSL_free(header);
231         OPENSSL_free(data);
232     }
233     if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
234         goto err;
235     if (!PEM_do_header(&cipher, data, &len, cb, u))
236         goto err;
237 
238     *pdata = data;
239     *plen = len;
240 
241     if (pnm)
242         *pnm = nm;
243 
244     ret = 1;
245 
246  err:
247     if (!ret || !pnm)
248         OPENSSL_free(nm);
249     OPENSSL_free(header);
250     if (!ret)
251         OPENSSL_free(data);
252     return ret;
253 }
254 
255 #ifndef OPENSSL_NO_FP_API
PEM_ASN1_write(i2d_of_void * i2d,const char * name,FILE * fp,void * x,const EVP_CIPHER * enc,unsigned char * kstr,int klen,pem_password_cb * callback,void * u)256 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
257                    void *x, const EVP_CIPHER *enc, unsigned char *kstr,
258                    int klen, pem_password_cb *callback, void *u)
259 {
260     BIO *b = BIO_new_fp(fp, BIO_NOCLOSE);
261     if (b == NULL) {
262         OPENSSL_PUT_ERROR(PEM, ERR_R_BUF_LIB);
263         return 0;
264     }
265     int ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
266     BIO_free(b);
267     return ret;
268 }
269 #endif
270 
PEM_ASN1_write_bio(i2d_of_void * i2d,const char * name,BIO * bp,void * x,const EVP_CIPHER * enc,unsigned char * kstr,int klen,pem_password_cb * callback,void * u)271 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
272                        void *x, const EVP_CIPHER *enc, unsigned char *kstr,
273                        int klen, pem_password_cb *callback, void *u)
274 {
275     EVP_CIPHER_CTX ctx;
276     int dsize = 0, i, j, ret = 0;
277     unsigned char *p, *data = NULL;
278     const char *objstr = NULL;
279     char buf[PEM_BUFSIZE];
280     unsigned char key[EVP_MAX_KEY_LENGTH];
281     unsigned char iv[EVP_MAX_IV_LENGTH];
282 
283     if (enc != NULL) {
284         objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
285         if (objstr == NULL ||
286             cipher_by_name(objstr) == NULL ||
287             EVP_CIPHER_iv_length(enc) < 8) {
288             OPENSSL_PUT_ERROR(PEM, PEM_R_UNSUPPORTED_CIPHER);
289             goto err;
290         }
291     }
292 
293     if ((dsize = i2d(x, NULL)) < 0) {
294         OPENSSL_PUT_ERROR(PEM, ERR_R_ASN1_LIB);
295         dsize = 0;
296         goto err;
297     }
298     /* dzise + 8 bytes are needed */
299     /* actually it needs the cipher block size extra... */
300     data = (unsigned char *)OPENSSL_malloc((unsigned int)dsize + 20);
301     if (data == NULL) {
302         OPENSSL_PUT_ERROR(PEM, ERR_R_MALLOC_FAILURE);
303         goto err;
304     }
305     p = data;
306     i = i2d(x, &p);
307 
308     if (enc != NULL) {
309         const unsigned iv_len = EVP_CIPHER_iv_length(enc);
310 
311         if (kstr == NULL) {
312             klen = 0;
313             if (!callback)
314                 callback = PEM_def_callback;
315             klen = (*callback) (buf, PEM_BUFSIZE, 1, u);
316             if (klen <= 0) {
317                 OPENSSL_PUT_ERROR(PEM, PEM_R_READ_KEY);
318                 goto err;
319             }
320             kstr = (unsigned char *)buf;
321         }
322         assert(iv_len <= (int)sizeof(iv));
323         if (!RAND_bytes(iv, iv_len)) /* Generate a salt */
324             goto err;
325         /*
326          * The 'iv' is used as the iv and as a salt.  It is NOT taken from
327          * the BytesToKey function
328          */
329         if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL))
330             goto err;
331 
332         if (kstr == (unsigned char *)buf)
333             OPENSSL_cleanse(buf, PEM_BUFSIZE);
334 
335         assert(strlen(objstr) + 23 + 2 * iv_len + 13 <= sizeof buf);
336 
337         buf[0] = '\0';
338         PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
339         PEM_dek_info(buf, objstr, iv_len, (char *)iv);
340         /* k=strlen(buf); */
341 
342         EVP_CIPHER_CTX_init(&ctx);
343         ret = 1;
344         if (!EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv)
345             || !EVP_EncryptUpdate(&ctx, data, &j, data, i)
346             || !EVP_EncryptFinal_ex(&ctx, &(data[j]), &i))
347             ret = 0;
348         else
349             i += j;
350         EVP_CIPHER_CTX_cleanup(&ctx);
351         if (ret == 0)
352             goto err;
353     } else {
354         ret = 1;
355         buf[0] = '\0';
356     }
357     i = PEM_write_bio(bp, name, buf, data, i);
358     if (i <= 0)
359         ret = 0;
360  err:
361     OPENSSL_cleanse(key, sizeof(key));
362     OPENSSL_cleanse(iv, sizeof(iv));
363     OPENSSL_cleanse((char *)&ctx, sizeof(ctx));
364     OPENSSL_cleanse(buf, PEM_BUFSIZE);
365     OPENSSL_free(data);
366     return (ret);
367 }
368 
PEM_do_header(EVP_CIPHER_INFO * cipher,unsigned char * data,long * plen,pem_password_cb * callback,void * u)369 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
370                   pem_password_cb *callback, void *u)
371 {
372     int i = 0, j, o, klen;
373     long len;
374     EVP_CIPHER_CTX ctx;
375     unsigned char key[EVP_MAX_KEY_LENGTH];
376     char buf[PEM_BUFSIZE];
377 
378     len = *plen;
379 
380     if (cipher->cipher == NULL)
381         return (1);
382 
383     klen = 0;
384     if (!callback)
385         callback = PEM_def_callback;
386     klen = callback(buf, PEM_BUFSIZE, 0, u);
387     if (klen <= 0) {
388         OPENSSL_PUT_ERROR(PEM, PEM_R_BAD_PASSWORD_READ);
389         return (0);
390     }
391 
392     if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
393                         (unsigned char *)buf, klen, 1, key, NULL))
394         return 0;
395 
396     j = (int)len;
397     EVP_CIPHER_CTX_init(&ctx);
398     o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
399     if (o)
400         o = EVP_DecryptUpdate(&ctx, data, &i, data, j);
401     if (o)
402         o = EVP_DecryptFinal_ex(&ctx, &(data[i]), &j);
403     EVP_CIPHER_CTX_cleanup(&ctx);
404     OPENSSL_cleanse((char *)buf, sizeof(buf));
405     OPENSSL_cleanse((char *)key, sizeof(key));
406     if (!o) {
407         OPENSSL_PUT_ERROR(PEM, PEM_R_BAD_DECRYPT);
408         return (0);
409     }
410     j += i;
411     *plen = j;
412     return (1);
413 }
414 
PEM_get_EVP_CIPHER_INFO(char * header,EVP_CIPHER_INFO * cipher)415 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
416 {
417     const EVP_CIPHER *enc = NULL;
418     char *p, c;
419     char **header_pp = &header;
420 
421     cipher->cipher = NULL;
422     OPENSSL_memset(cipher->iv, 0, sizeof(cipher->iv));
423     if ((header == NULL) || (*header == '\0') || (*header == '\n'))
424         return (1);
425     if (strncmp(header, "Proc-Type: ", 11) != 0) {
426         OPENSSL_PUT_ERROR(PEM, PEM_R_NOT_PROC_TYPE);
427         return (0);
428     }
429     header += 11;
430     if (*header != '4')
431         return (0);
432     header++;
433     if (*header != ',')
434         return (0);
435     header++;
436     if (strncmp(header, "ENCRYPTED", 9) != 0) {
437         OPENSSL_PUT_ERROR(PEM, PEM_R_NOT_ENCRYPTED);
438         return (0);
439     }
440     for (; (*header != '\n') && (*header != '\0'); header++) ;
441     if (*header == '\0') {
442         OPENSSL_PUT_ERROR(PEM, PEM_R_SHORT_HEADER);
443         return (0);
444     }
445     header++;
446     if (strncmp(header, "DEK-Info: ", 10) != 0) {
447         OPENSSL_PUT_ERROR(PEM, PEM_R_NOT_DEK_INFO);
448         return (0);
449     }
450     header += 10;
451 
452     p = header;
453     for (;;) {
454         c = *header;
455         if (!(((c >= 'A') && (c <= 'Z')) || (c == '-') ||
456               ((c >= '0') && (c <= '9'))))
457             break;
458         header++;
459     }
460     *header = '\0';
461     cipher->cipher = enc = cipher_by_name(p);
462     *header = c;
463     header++;
464 
465     if (enc == NULL) {
466         OPENSSL_PUT_ERROR(PEM, PEM_R_UNSUPPORTED_ENCRYPTION);
467         return (0);
468     }
469     // The IV parameter must be at least 8 bytes long to be used as the salt in
470     // the KDF. (This should not happen given |cipher_by_name|.)
471     if (EVP_CIPHER_iv_length(enc) < 8) {
472         assert(0);
473         OPENSSL_PUT_ERROR(PEM, PEM_R_UNSUPPORTED_ENCRYPTION);
474         return 0;
475     }
476     if (!load_iv(header_pp, &(cipher->iv[0]), EVP_CIPHER_iv_length(enc)))
477         return (0);
478 
479     return (1);
480 }
481 
load_iv(char ** fromp,unsigned char * to,int num)482 static int load_iv(char **fromp, unsigned char *to, int num)
483 {
484     int v, i;
485     char *from;
486 
487     from = *fromp;
488     for (i = 0; i < num; i++)
489         to[i] = 0;
490     num *= 2;
491     for (i = 0; i < num; i++) {
492         if ((*from >= '0') && (*from <= '9'))
493             v = *from - '0';
494         else if ((*from >= 'A') && (*from <= 'F'))
495             v = *from - 'A' + 10;
496         else if ((*from >= 'a') && (*from <= 'f'))
497             v = *from - 'a' + 10;
498         else {
499             OPENSSL_PUT_ERROR(PEM, PEM_R_BAD_IV_CHARS);
500             return (0);
501         }
502         from++;
503         to[i / 2] |= v << (long)((!(i & 1)) * 4);
504     }
505 
506     *fromp = from;
507     return (1);
508 }
509 
510 #ifndef OPENSSL_NO_FP_API
PEM_write(FILE * fp,const char * name,const char * header,const unsigned char * data,long len)511 int PEM_write(FILE *fp, const char *name, const char *header,
512               const unsigned char *data, long len)
513 {
514     BIO *b = BIO_new_fp(fp, BIO_NOCLOSE);
515     if (b == NULL) {
516         OPENSSL_PUT_ERROR(PEM, ERR_R_BUF_LIB);
517         return 0;
518     }
519     int ret = PEM_write_bio(b, name, header, data, len);
520     BIO_free(b);
521     return (ret);
522 }
523 #endif
524 
PEM_write_bio(BIO * bp,const char * name,const char * header,const unsigned char * data,long len)525 int PEM_write_bio(BIO *bp, const char *name, const char *header,
526                   const unsigned char *data, long len)
527 {
528     int nlen, n, i, j, outl;
529     unsigned char *buf = NULL;
530     EVP_ENCODE_CTX ctx;
531     int reason = ERR_R_BUF_LIB;
532 
533     EVP_EncodeInit(&ctx);
534     nlen = strlen(name);
535 
536     if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
537         (BIO_write(bp, name, nlen) != nlen) ||
538         (BIO_write(bp, "-----\n", 6) != 6))
539         goto err;
540 
541     i = strlen(header);
542     if (i > 0) {
543         if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
544             goto err;
545     }
546 
547     buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
548     if (buf == NULL) {
549         reason = ERR_R_MALLOC_FAILURE;
550         goto err;
551     }
552 
553     i = j = 0;
554     while (len > 0) {
555         n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
556         EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n);
557         if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
558             goto err;
559         i += outl;
560         len -= n;
561         j += n;
562     }
563     EVP_EncodeFinal(&ctx, buf, &outl);
564     if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
565         goto err;
566     OPENSSL_free(buf);
567     buf = NULL;
568     if ((BIO_write(bp, "-----END ", 9) != 9) ||
569         (BIO_write(bp, name, nlen) != nlen) ||
570         (BIO_write(bp, "-----\n", 6) != 6))
571         goto err;
572     return (i + outl);
573  err:
574     if (buf) {
575         OPENSSL_free(buf);
576     }
577     OPENSSL_PUT_ERROR(PEM, reason);
578     return (0);
579 }
580 
581 #ifndef OPENSSL_NO_FP_API
PEM_read(FILE * fp,char ** name,char ** header,unsigned char ** data,long * len)582 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
583              long *len)
584 {
585     BIO *b = BIO_new_fp(fp, BIO_NOCLOSE);
586     if (b == NULL) {
587         OPENSSL_PUT_ERROR(PEM, ERR_R_BUF_LIB);
588         return 0;
589     }
590     int ret = PEM_read_bio(b, name, header, data, len);
591     BIO_free(b);
592     return (ret);
593 }
594 #endif
595 
PEM_read_bio(BIO * bp,char ** name,char ** header,unsigned char ** data,long * len)596 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
597                  long *len)
598 {
599     EVP_ENCODE_CTX ctx;
600     int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
601     char buf[256];
602     BUF_MEM *nameB;
603     BUF_MEM *headerB;
604     BUF_MEM *dataB, *tmpB;
605 
606     nameB = BUF_MEM_new();
607     headerB = BUF_MEM_new();
608     dataB = BUF_MEM_new();
609     if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {
610         BUF_MEM_free(nameB);
611         BUF_MEM_free(headerB);
612         BUF_MEM_free(dataB);
613         OPENSSL_PUT_ERROR(PEM, ERR_R_MALLOC_FAILURE);
614         return (0);
615     }
616 
617     buf[254] = '\0';
618     for (;;) {
619         i = BIO_gets(bp, buf, 254);
620 
621         if (i <= 0) {
622             OPENSSL_PUT_ERROR(PEM, PEM_R_NO_START_LINE);
623             goto err;
624         }
625 
626         while ((i >= 0) && (buf[i] <= ' '))
627             i--;
628         buf[++i] = '\n';
629         buf[++i] = '\0';
630 
631         if (strncmp(buf, "-----BEGIN ", 11) == 0) {
632             i = strlen(&(buf[11]));
633 
634             if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)
635                 continue;
636             if (!BUF_MEM_grow(nameB, i + 9)) {
637                 OPENSSL_PUT_ERROR(PEM, ERR_R_MALLOC_FAILURE);
638                 goto err;
639             }
640             OPENSSL_memcpy(nameB->data, &(buf[11]), i - 6);
641             nameB->data[i - 6] = '\0';
642             break;
643         }
644     }
645     hl = 0;
646     if (!BUF_MEM_grow(headerB, 256)) {
647         OPENSSL_PUT_ERROR(PEM, ERR_R_MALLOC_FAILURE);
648         goto err;
649     }
650     headerB->data[0] = '\0';
651     for (;;) {
652         i = BIO_gets(bp, buf, 254);
653         if (i <= 0)
654             break;
655 
656         while ((i >= 0) && (buf[i] <= ' '))
657             i--;
658         buf[++i] = '\n';
659         buf[++i] = '\0';
660 
661         if (buf[0] == '\n')
662             break;
663         if (!BUF_MEM_grow(headerB, hl + i + 9)) {
664             OPENSSL_PUT_ERROR(PEM, ERR_R_MALLOC_FAILURE);
665             goto err;
666         }
667         if (strncmp(buf, "-----END ", 9) == 0) {
668             nohead = 1;
669             break;
670         }
671         OPENSSL_memcpy(&(headerB->data[hl]), buf, i);
672         headerB->data[hl + i] = '\0';
673         hl += i;
674     }
675 
676     bl = 0;
677     if (!BUF_MEM_grow(dataB, 1024)) {
678         OPENSSL_PUT_ERROR(PEM, ERR_R_MALLOC_FAILURE);
679         goto err;
680     }
681     dataB->data[0] = '\0';
682     if (!nohead) {
683         for (;;) {
684             i = BIO_gets(bp, buf, 254);
685             if (i <= 0)
686                 break;
687 
688             while ((i >= 0) && (buf[i] <= ' '))
689                 i--;
690             buf[++i] = '\n';
691             buf[++i] = '\0';
692 
693             if (i != 65)
694                 end = 1;
695             if (strncmp(buf, "-----END ", 9) == 0)
696                 break;
697             if (i > 65)
698                 break;
699             if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
700                 OPENSSL_PUT_ERROR(PEM, ERR_R_MALLOC_FAILURE);
701                 goto err;
702             }
703             OPENSSL_memcpy(&(dataB->data[bl]), buf, i);
704             dataB->data[bl + i] = '\0';
705             bl += i;
706             if (end) {
707                 buf[0] = '\0';
708                 i = BIO_gets(bp, buf, 254);
709                 if (i <= 0)
710                     break;
711 
712                 while ((i >= 0) && (buf[i] <= ' '))
713                     i--;
714                 buf[++i] = '\n';
715                 buf[++i] = '\0';
716 
717                 break;
718             }
719         }
720     } else {
721         tmpB = headerB;
722         headerB = dataB;
723         dataB = tmpB;
724         bl = hl;
725     }
726     i = strlen(nameB->data);
727     if ((strncmp(buf, "-----END ", 9) != 0) ||
728         (strncmp(nameB->data, &(buf[9]), i) != 0) ||
729         (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
730         OPENSSL_PUT_ERROR(PEM, PEM_R_BAD_END_LINE);
731         goto err;
732     }
733 
734     EVP_DecodeInit(&ctx);
735     i = EVP_DecodeUpdate(&ctx,
736                          (unsigned char *)dataB->data, &bl,
737                          (unsigned char *)dataB->data, bl);
738     if (i < 0) {
739         OPENSSL_PUT_ERROR(PEM, PEM_R_BAD_BASE64_DECODE);
740         goto err;
741     }
742     i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k);
743     if (i < 0) {
744         OPENSSL_PUT_ERROR(PEM, PEM_R_BAD_BASE64_DECODE);
745         goto err;
746     }
747     bl += k;
748 
749     if (bl == 0)
750         goto err;
751     *name = nameB->data;
752     *header = headerB->data;
753     *data = (unsigned char *)dataB->data;
754     *len = bl;
755     OPENSSL_free(nameB);
756     OPENSSL_free(headerB);
757     OPENSSL_free(dataB);
758     return (1);
759  err:
760     BUF_MEM_free(nameB);
761     BUF_MEM_free(headerB);
762     BUF_MEM_free(dataB);
763     return (0);
764 }
765 
PEM_def_callback(char * buf,int size,int rwflag,void * userdata)766 int PEM_def_callback(char *buf, int size, int rwflag, void *userdata)
767 {
768     if (!buf || !userdata || size < 0) {
769         return 0;
770     }
771     size_t len = strlen((char *)userdata);
772     if (len >= (size_t)size) {
773         return 0;
774     }
775     BUF_strlcpy(buf, userdata, (size_t)size);
776     return len;
777 }
778