2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include "crypto/ctype.h"
13 #include "internal/cryptlib.h"
14 #include <openssl/buffer.h>
15 #include <openssl/objects.h>
16 #include <openssl/evp.h>
17 #include <openssl/rand.h>
18 #include <openssl/x509.h>
19 #include <openssl/pem.h>
20 #include <openssl/pkcs12.h>
21 #include "crypto/asn1.h"
22 #include <openssl/des.h>
23 #include <openssl/engine.h>
27 static int load_iv(char **fromp, unsigned char *to, int num);
28 static int check_pem(const char *nm, const char *name);
29 int pem_check_suffix(const char *pem_str, const char *suffix);
31 int PEM_def_callback(char *buf, int num, int rwflag, void *userdata)
36 /* We assume that the user passes a default password as userdata */
39 i = (i > num) ? num : i;
40 memcpy(buf, userdata, i);
44 prompt = EVP_get_pw_prompt();
46 prompt = "Enter PEM pass phrase:";
49 * rwflag == 0 means decryption
50 * rwflag == 1 means encryption
52 * We assume that for encryption, we want a minimum length, while for
53 * decryption, we cannot know any minimum length, so we assume zero.
55 min_len = rwflag ? MIN_LENGTH : 0;
57 i = EVP_read_pw_string_min(buf, min_len, num, prompt, rwflag);
59 PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD);
60 memset(buf, 0, (unsigned int)num);
66 void PEM_proc_type(char *buf, int type)
69 char *p = buf + strlen(buf);
71 if (type == PEM_TYPE_ENCRYPTED)
73 else if (type == PEM_TYPE_MIC_CLEAR)
75 else if (type == PEM_TYPE_MIC_ONLY)
80 BIO_snprintf(p, PEM_BUFSIZE - (size_t)(p - buf), "Proc-Type: 4,%s\n", str);
83 void PEM_dek_info(char *buf, const char *type, int len, const char *str)
86 char *p = buf + strlen(buf);
87 int j = PEM_BUFSIZE - (size_t)(p - buf), n;
89 n = BIO_snprintf(p, j, "DEK-Info: %s,", type);
93 for (i = 0; i < len; i++) {
94 n = BIO_snprintf(p, j, "%02X", 0xff & str[i]);
105 #ifndef OPENSSL_NO_STDIO
106 void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
107 pem_password_cb *cb, void *u)
112 if ((b = BIO_new(BIO_s_file())) == NULL) {
113 PEMerr(PEM_F_PEM_ASN1_READ, ERR_R_BUF_LIB);
116 BIO_set_fp(b, fp, BIO_NOCLOSE);
117 ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
123 static int check_pem(const char *nm, const char *name)
125 /* Normal matching nm and name */
126 if (strcmp(nm, name) == 0)
129 /* Make PEM_STRING_EVP_PKEY match any private key */
131 if (strcmp(name, PEM_STRING_EVP_PKEY) == 0) {
133 const EVP_PKEY_ASN1_METHOD *ameth;
134 if (strcmp(nm, PEM_STRING_PKCS8) == 0)
136 if (strcmp(nm, PEM_STRING_PKCS8INF) == 0)
138 slen = pem_check_suffix(nm, "PRIVATE KEY");
141 * NB: ENGINE implementations won't contain a deprecated old
142 * private key decode function so don't look for them.
144 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
145 if (ameth && ameth->old_priv_decode)
151 if (strcmp(name, PEM_STRING_PARAMETERS) == 0) {
153 const EVP_PKEY_ASN1_METHOD *ameth;
154 slen = pem_check_suffix(nm, "PARAMETERS");
157 ameth = EVP_PKEY_asn1_find_str(&e, nm, slen);
160 if (ameth->param_decode)
164 #ifndef OPENSSL_NO_ENGINE
172 /* If reading DH parameters handle X9.42 DH format too */
173 if (strcmp(nm, PEM_STRING_DHXPARAMS) == 0
174 && strcmp(name, PEM_STRING_DHPARAMS) == 0)
177 /* Permit older strings */
179 if (strcmp(nm, PEM_STRING_X509_OLD) == 0
180 && strcmp(name, PEM_STRING_X509) == 0)
183 if (strcmp(nm, PEM_STRING_X509_REQ_OLD) == 0
184 && strcmp(name, PEM_STRING_X509_REQ) == 0)
187 /* Allow normal certs to be read as trusted certs */
188 if (strcmp(nm, PEM_STRING_X509) == 0
189 && strcmp(name, PEM_STRING_X509_TRUSTED) == 0)
192 if (strcmp(nm, PEM_STRING_X509_OLD) == 0
193 && strcmp(name, PEM_STRING_X509_TRUSTED) == 0)
196 /* Some CAs use PKCS#7 with CERTIFICATE headers */
197 if (strcmp(nm, PEM_STRING_X509) == 0
198 && strcmp(name, PEM_STRING_PKCS7) == 0)
201 if (strcmp(nm, PEM_STRING_PKCS7_SIGNED) == 0
202 && strcmp(name, PEM_STRING_PKCS7) == 0)
205 #ifndef OPENSSL_NO_CMS
206 if (strcmp(nm, PEM_STRING_X509) == 0
207 && strcmp(name, PEM_STRING_CMS) == 0)
209 /* Allow CMS to be read from PKCS#7 headers */
210 if (strcmp(nm, PEM_STRING_PKCS7) == 0
211 && strcmp(name, PEM_STRING_CMS) == 0)
218 static void pem_free(void *p, unsigned int flags, size_t num)
220 if (flags & PEM_FLAG_SECURE)
221 OPENSSL_secure_clear_free(p, num);
226 static void *pem_malloc(int num, unsigned int flags)
228 return (flags & PEM_FLAG_SECURE) ? OPENSSL_secure_malloc(num)
229 : OPENSSL_malloc(num);
232 static int pem_bytes_read_bio_flags(unsigned char **pdata, long *plen,
233 char **pnm, const char *name, BIO *bp,
234 pem_password_cb *cb, void *u,
237 EVP_CIPHER_INFO cipher;
238 char *nm = NULL, *header = NULL;
239 unsigned char *data = NULL;
244 pem_free(nm, flags, 0);
245 pem_free(header, flags, 0);
246 pem_free(data, flags, len);
247 if (!PEM_read_bio_ex(bp, &nm, &header, &data, &len, flags)) {
248 if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE)
249 ERR_add_error_data(2, "Expecting: ", name);
252 } while (!check_pem(nm, name));
253 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
255 if (!PEM_do_header(&cipher, data, &len, cb, u))
267 if (!ret || pnm == NULL)
268 pem_free(nm, flags, 0);
269 pem_free(header, flags, 0);
271 pem_free(data, flags, len);
275 int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
276 const char *name, BIO *bp, pem_password_cb *cb,
278 return pem_bytes_read_bio_flags(pdata, plen, pnm, name, bp, cb, u,
279 PEM_FLAG_EAY_COMPATIBLE);
282 int PEM_bytes_read_bio_secmem(unsigned char **pdata, long *plen, char **pnm,
283 const char *name, BIO *bp, pem_password_cb *cb,
285 return pem_bytes_read_bio_flags(pdata, plen, pnm, name, bp, cb, u,
286 PEM_FLAG_SECURE | PEM_FLAG_EAY_COMPATIBLE);
289 #ifndef OPENSSL_NO_STDIO
290 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
291 const void *x, const EVP_CIPHER *enc,
292 const unsigned char *kstr, int klen,
293 pem_password_cb *callback, void *u)
298 if ((b = BIO_new(BIO_s_file())) == NULL) {
299 PEMerr(PEM_F_PEM_ASN1_WRITE, ERR_R_BUF_LIB);
302 BIO_set_fp(b, fp, BIO_NOCLOSE);
303 ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
309 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
310 const void *x, const EVP_CIPHER *enc,
311 const unsigned char *kstr, int klen,
312 pem_password_cb *callback, void *u)
314 EVP_CIPHER_CTX *ctx = NULL;
315 int dsize = 0, i = 0, j = 0, ret = 0;
316 unsigned char *p, *data = NULL;
317 const char *objstr = NULL;
318 char buf[PEM_BUFSIZE];
319 unsigned char key[EVP_MAX_KEY_LENGTH];
320 unsigned char iv[EVP_MAX_IV_LENGTH];
323 objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
324 if (objstr == NULL || EVP_CIPHER_iv_length(enc) == 0
325 || EVP_CIPHER_iv_length(enc) > (int)sizeof(iv)
327 * Check "Proc-Type: 4,Encrypted\nDEK-Info: objstr,hex-iv\n"
330 || (strlen(objstr) + 23 + 2 * EVP_CIPHER_iv_length(enc) + 13)
332 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER);
337 if ((dsize = i2d(x, NULL)) < 0) {
338 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB);
342 /* dsize + 8 bytes are needed */
343 /* actually it needs the cipher block size extra... */
344 data = OPENSSL_malloc((unsigned int)dsize + 20);
346 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE);
354 if (callback == NULL)
355 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
357 klen = (*callback) (buf, PEM_BUFSIZE, 1, u);
359 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_READ_KEY);
362 #ifdef CHARSET_EBCDIC
363 /* Convert the pass phrase from EBCDIC */
364 ebcdic2ascii(buf, buf, klen);
366 kstr = (unsigned char *)buf;
368 if (RAND_bytes(iv, EVP_CIPHER_iv_length(enc)) <= 0) /* Generate a salt */
371 * The 'iv' is used as the iv and as a salt. It is NOT taken from
372 * the BytesToKey function
374 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL))
377 if (kstr == (unsigned char *)buf)
378 OPENSSL_cleanse(buf, PEM_BUFSIZE);
381 PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
382 PEM_dek_info(buf, objstr, EVP_CIPHER_iv_length(enc), (char *)iv);
386 if ((ctx = EVP_CIPHER_CTX_new()) == NULL
387 || !EVP_EncryptInit_ex(ctx, enc, NULL, key, iv)
388 || !EVP_EncryptUpdate(ctx, data, &j, data, i)
389 || !EVP_EncryptFinal_ex(ctx, &(data[j]), &i))
398 i = PEM_write_bio(bp, name, buf, data, i);
402 OPENSSL_cleanse(key, sizeof(key));
403 OPENSSL_cleanse(iv, sizeof(iv));
404 EVP_CIPHER_CTX_free(ctx);
405 OPENSSL_cleanse(buf, PEM_BUFSIZE);
406 OPENSSL_clear_free(data, (unsigned int)dsize);
410 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
411 pem_password_cb *callback, void *u)
416 int ilen = (int) len; /* EVP_DecryptUpdate etc. take int lengths */
418 unsigned char key[EVP_MAX_KEY_LENGTH];
419 char buf[PEM_BUFSIZE];
421 #if LONG_MAX > INT_MAX
422 /* Check that we did not truncate the length */
424 PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_HEADER_TOO_LONG);
429 if (cipher->cipher == NULL)
431 if (callback == NULL)
432 keylen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
434 keylen = callback(buf, PEM_BUFSIZE, 0, u);
436 PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ);
439 #ifdef CHARSET_EBCDIC
440 /* Convert the pass phrase from EBCDIC */
441 ebcdic2ascii(buf, buf, keylen);
444 if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
445 (unsigned char *)buf, keylen, 1, key, NULL))
448 ctx = EVP_CIPHER_CTX_new();
452 ok = EVP_DecryptInit_ex(ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
454 ok = EVP_DecryptUpdate(ctx, data, &ilen, data, ilen);
456 /* Squirrel away the length of data decrypted so far. */
458 ok = EVP_DecryptFinal_ex(ctx, &(data[ilen]), &ilen);
463 PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT);
465 EVP_CIPHER_CTX_free(ctx);
466 OPENSSL_cleanse((char *)buf, sizeof(buf));
467 OPENSSL_cleanse((char *)key, sizeof(key));
472 * This implements a very limited PEM header parser that does not support the
473 * full grammar of rfc1421. In particular, folded headers are not supported,
474 * nor is additional whitespace.
476 * A robust implementation would make use of a library that turns the headers
477 * into a BIO from which one folded line is read at a time, and is then split
478 * into a header label and content. We would then parse the content of the
479 * headers we care about. This is overkill for just this limited use-case, but
480 * presumably we also parse rfc822-style headers for S/MIME, so a common
481 * abstraction might well be more generally useful.
483 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
485 static const char ProcType[] = "Proc-Type:";
486 static const char ENCRYPTED[] = "ENCRYPTED";
487 static const char DEKInfo[] = "DEK-Info:";
488 const EVP_CIPHER *enc = NULL;
490 char *dekinfostart, c;
492 cipher->cipher = NULL;
493 memset(cipher->iv, 0, sizeof(cipher->iv));
494 if ((header == NULL) || (*header == '\0') || (*header == '\n'))
497 if (strncmp(header, ProcType, sizeof(ProcType)-1) != 0) {
498 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE);
501 header += sizeof(ProcType)-1;
502 header += strspn(header, " \t");
504 if (*header++ != '4' || *header++ != ',')
506 header += strspn(header, " \t");
508 /* We expect "ENCRYPTED" followed by optional white-space + line break */
509 if (strncmp(header, ENCRYPTED, sizeof(ENCRYPTED)-1) != 0 ||
510 strspn(header+sizeof(ENCRYPTED)-1, " \t\r\n") == 0) {
511 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED);
514 header += sizeof(ENCRYPTED)-1;
515 header += strspn(header, " \t\r");
516 if (*header++ != '\n') {
517 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_SHORT_HEADER);
522 * https://tools.ietf.org/html/rfc1421#section-4.6.1.3
523 * We expect "DEK-Info: algo[,hex-parameters]"
525 if (strncmp(header, DEKInfo, sizeof(DEKInfo)-1) != 0) {
526 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_DEK_INFO);
529 header += sizeof(DEKInfo)-1;
530 header += strspn(header, " \t");
533 * DEK-INFO is a comma-separated combination of algorithm name and optional
536 dekinfostart = header;
537 header += strcspn(header, " \t,");
540 cipher->cipher = enc = EVP_get_cipherbyname(dekinfostart);
542 header += strspn(header, " \t");
545 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION);
548 ivlen = EVP_CIPHER_iv_length(enc);
549 if (ivlen > 0 && *header++ != ',') {
550 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_MISSING_DEK_IV);
552 } else if (ivlen == 0 && *header == ',') {
553 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNEXPECTED_DEK_IV);
557 if (!load_iv(&header, cipher->iv, EVP_CIPHER_iv_length(enc)))
563 static int load_iv(char **fromp, unsigned char *to, int num)
569 for (i = 0; i < num; i++)
572 for (i = 0; i < num; i++) {
573 v = OPENSSL_hexchar2int(*from);
575 PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS);
579 to[i / 2] |= v << (long)((!(i & 1)) * 4);
586 #ifndef OPENSSL_NO_STDIO
587 int PEM_write(FILE *fp, const char *name, const char *header,
588 const unsigned char *data, long len)
593 if ((b = BIO_new(BIO_s_file())) == NULL) {
594 PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB);
597 BIO_set_fp(b, fp, BIO_NOCLOSE);
598 ret = PEM_write_bio(b, name, header, data, len);
604 int PEM_write_bio(BIO *bp, const char *name, const char *header,
605 const unsigned char *data, long len)
607 int nlen, n, i, j, outl;
608 unsigned char *buf = NULL;
609 EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new();
610 int reason = ERR_R_BUF_LIB;
614 reason = ERR_R_MALLOC_FAILURE;
621 if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
622 (BIO_write(bp, name, nlen) != nlen) ||
623 (BIO_write(bp, "-----\n", 6) != 6))
628 if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
632 buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
634 reason = ERR_R_MALLOC_FAILURE;
640 n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
641 if (!EVP_EncodeUpdate(ctx, buf, &outl, &(data[j]), n))
643 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
649 EVP_EncodeFinal(ctx, buf, &outl);
650 if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
652 if ((BIO_write(bp, "-----END ", 9) != 9) ||
653 (BIO_write(bp, name, nlen) != nlen) ||
654 (BIO_write(bp, "-----\n", 6) != 6))
660 PEMerr(PEM_F_PEM_WRITE_BIO, reason);
661 EVP_ENCODE_CTX_free(ctx);
662 OPENSSL_clear_free(buf, PEM_BUFSIZE * 8);
666 #ifndef OPENSSL_NO_STDIO
667 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
673 if ((b = BIO_new(BIO_s_file())) == NULL) {
674 PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB);
677 BIO_set_fp(b, fp, BIO_NOCLOSE);
678 ret = PEM_read_bio(b, name, header, data, len);
684 /* Some helpers for PEM_read_bio_ex(). */
685 static int sanitize_line(char *linebuf, int len, unsigned int flags, int first_call)
689 /* Other BOMs imply unsupported multibyte encoding,
690 * so don't strip them and let the error raise */
691 const unsigned char utf8_bom[3] = {0xEF, 0xBB, 0xBF};
693 if (len > 3 && memcmp(linebuf, utf8_bom, 3) == 0) {
694 memmove(linebuf, linebuf + 3, len - 3);
695 linebuf[len - 3] = 0;
700 if (flags & PEM_FLAG_EAY_COMPATIBLE) {
701 /* Strip trailing whitespace */
702 while ((len >= 0) && (linebuf[len] <= ' '))
704 /* Go back to whitespace before applying uniform line ending. */
706 } else if (flags & PEM_FLAG_ONLY_B64) {
707 for (i = 0; i < len; ++i) {
708 if (!ossl_isbase64(linebuf[i]) || linebuf[i] == '\n'
709 || linebuf[i] == '\r')
714 /* EVP_DecodeBlock strips leading and trailing whitespace, so just strip
715 * control characters in-place and let everything through. */
716 for (i = 0; i < len; ++i) {
717 if (linebuf[i] == '\n' || linebuf[i] == '\r')
719 if (ossl_iscntrl(linebuf[i]))
724 /* The caller allocated LINESIZE+1, so this is safe. */
725 linebuf[len++] = '\n';
731 /* Note trailing spaces for begin and end. */
732 static const char beginstr[] = "-----BEGIN ";
733 static const char endstr[] = "-----END ";
734 static const char tailstr[] = "-----\n";
735 #define BEGINLEN ((int)(sizeof(beginstr) - 1))
736 #define ENDLEN ((int)(sizeof(endstr) - 1))
737 #define TAILLEN ((int)(sizeof(tailstr) - 1))
738 static int get_name(BIO *bp, char **name, unsigned int flags)
746 * Need to hold trailing NUL (accounted for by BIO_gets() and the newline
747 * that will be added by sanitize_line() (the extra '1').
749 linebuf = pem_malloc(LINESIZE + 1, flags);
750 if (linebuf == NULL) {
751 PEMerr(PEM_F_GET_NAME, ERR_R_MALLOC_FAILURE);
756 len = BIO_gets(bp, linebuf, LINESIZE);
759 PEMerr(PEM_F_GET_NAME, PEM_R_NO_START_LINE);
763 /* Strip trailing garbage and standardize ending. */
764 len = sanitize_line(linebuf, len, flags & ~PEM_FLAG_ONLY_B64, first_call);
767 /* Allow leading empty or non-matching lines. */
768 } while (strncmp(linebuf, beginstr, BEGINLEN) != 0
770 || strncmp(linebuf + len - TAILLEN, tailstr, TAILLEN) != 0);
771 linebuf[len - TAILLEN] = '\0';
772 len = len - BEGINLEN - TAILLEN + 1;
773 *name = pem_malloc(len, flags);
775 PEMerr(PEM_F_GET_NAME, ERR_R_MALLOC_FAILURE);
778 memcpy(*name, linebuf + BEGINLEN, len);
782 pem_free(linebuf, flags, LINESIZE + 1);
786 /* Keep track of how much of a header we've seen. */
794 * Extract the optional PEM header, with details on the type of content and
795 * any encryption used on the contents, and the bulk of the data from the bio.
796 * The end of the header is marked by a blank line; if the end-of-input marker
797 * is reached prior to a blank line, there is no header.
799 * The header and data arguments are BIO** since we may have to swap them
800 * if there is no header, for efficiency.
802 * We need the name of the PEM-encoded type to verify the end string.
804 static int get_header_and_data(BIO *bp, BIO **header, BIO **data, char *name,
809 int len, line, ret = 0, end = 0, prev_partial_line_read = 0, partial_line_read = 0;
810 /* 0 if not seen (yet), 1 if reading header, 2 if finished header */
811 enum header_status got_header = MAYBE_HEADER;
812 unsigned int flags_mask;
815 /* Need to hold trailing NUL (accounted for by BIO_gets() and the newline
816 * that will be added by sanitize_line() (the extra '1'). */
817 linebuf = pem_malloc(LINESIZE + 1, flags);
818 if (linebuf == NULL) {
819 PEMerr(PEM_F_GET_HEADER_AND_DATA, ERR_R_MALLOC_FAILURE);
823 for (line = 0; ; line++) {
825 len = BIO_gets(bp, linebuf, LINESIZE);
827 PEMerr(PEM_F_GET_HEADER_AND_DATA, PEM_R_BAD_END_LINE);
832 * Check if line has been read completely or if only part of the line
833 * has been read. Keep the previous value to ignore newlines that
834 * appear due to reading a line up until the char before the newline.
836 prev_partial_line_read = partial_line_read;
837 partial_line_read = len == LINESIZE-1 && linebuf[LINESIZE-2] != '\n';
839 if (got_header == MAYBE_HEADER) {
840 if (memchr(linebuf, ':', len) != NULL)
841 got_header = IN_HEADER;
843 if (!strncmp(linebuf, endstr, ENDLEN) || got_header == IN_HEADER)
844 flags_mask &= ~PEM_FLAG_ONLY_B64;
845 len = sanitize_line(linebuf, len, flags & flags_mask, 0);
847 /* Check for end of header. */
848 if (linebuf[0] == '\n') {
850 * If previous line has been read only partially this newline is a
851 * regular newline at the end of a line and not an empty line.
853 if (!prev_partial_line_read) {
854 if (got_header == POST_HEADER) {
855 /* Another blank line is an error. */
856 PEMerr(PEM_F_GET_HEADER_AND_DATA, PEM_R_BAD_END_LINE);
859 got_header = POST_HEADER;
865 /* Check for end of stream (which means there is no header). */
866 if (strncmp(linebuf, endstr, ENDLEN) == 0) {
867 p = linebuf + ENDLEN;
868 namelen = strlen(name);
869 if (strncmp(p, name, namelen) != 0 ||
870 strncmp(p + namelen, tailstr, TAILLEN) != 0) {
871 PEMerr(PEM_F_GET_HEADER_AND_DATA, PEM_R_BAD_END_LINE);
874 if (got_header == MAYBE_HEADER) {
880 /* Malformed input; short line not at end of data. */
881 PEMerr(PEM_F_GET_HEADER_AND_DATA, PEM_R_BAD_END_LINE);
885 * Else, a line of text -- could be header or data; we don't
886 * know yet. Just pass it through.
888 if (BIO_puts(tmp, linebuf) < 0)
891 * Only encrypted files need the line length check applied.
893 if (got_header == POST_HEADER) {
894 /* 65 includes the trailing newline */
904 pem_free(linebuf, flags, LINESIZE + 1);
909 * Read in PEM-formatted data from the given BIO.
911 * By nature of the PEM format, all content must be printable ASCII (except
912 * for line endings). Other characters are malformed input and will be rejected.
914 int PEM_read_bio_ex(BIO *bp, char **name_out, char **header,
915 unsigned char **data, long *len_out, unsigned int flags)
917 EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new();
918 const BIO_METHOD *bmeth;
919 BIO *headerB = NULL, *dataB = NULL;
921 int len, taillen, headerlen, ret = 0;
925 PEMerr(PEM_F_PEM_READ_BIO_EX, ERR_R_MALLOC_FAILURE);
930 *name_out = *header = NULL;
932 if ((flags & PEM_FLAG_EAY_COMPATIBLE) && (flags & PEM_FLAG_ONLY_B64)) {
933 /* These two are mutually incompatible; bail out. */
934 PEMerr(PEM_F_PEM_READ_BIO_EX, ERR_R_PASSED_INVALID_ARGUMENT);
937 bmeth = (flags & PEM_FLAG_SECURE) ? BIO_s_secmem() : BIO_s_mem();
939 headerB = BIO_new(bmeth);
940 dataB = BIO_new(bmeth);
941 if (headerB == NULL || dataB == NULL) {
942 PEMerr(PEM_F_PEM_READ_BIO_EX, ERR_R_MALLOC_FAILURE);
946 if (!get_name(bp, &name, flags))
948 if (!get_header_and_data(bp, &headerB, &dataB, name, flags))
952 BIO_get_mem_ptr(dataB, &buf_mem);
953 len = buf_mem->length;
954 if (EVP_DecodeUpdate(ctx, (unsigned char*)buf_mem->data, &len,
955 (unsigned char*)buf_mem->data, len) < 0
956 || EVP_DecodeFinal(ctx, (unsigned char*)&(buf_mem->data[len]),
958 PEMerr(PEM_F_PEM_READ_BIO_EX, PEM_R_BAD_BASE64_DECODE);
962 buf_mem->length = len;
964 /* There was no data in the PEM file; avoid malloc(0). */
967 headerlen = BIO_get_mem_data(headerB, NULL);
968 *header = pem_malloc(headerlen + 1, flags);
969 *data = pem_malloc(len, flags);
970 if (*header == NULL || *data == NULL) {
971 pem_free(*header, flags, 0);
972 pem_free(*data, flags, 0);
975 BIO_read(headerB, *header, headerlen);
976 (*header)[headerlen] = '\0';
977 BIO_read(dataB, *data, len);
984 EVP_ENCODE_CTX_free(ctx);
985 pem_free(name, flags, 0);
991 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
994 return PEM_read_bio_ex(bp, name, header, data, len, PEM_FLAG_EAY_COMPATIBLE);
998 * Check pem string and return prefix length. If for example the pem_str ==
999 * "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the
1003 int pem_check_suffix(const char *pem_str, const char *suffix)
1005 int pem_len = strlen(pem_str);
1006 int suffix_len = strlen(suffix);
1008 if (suffix_len + 1 >= pem_len)
1010 p = pem_str + pem_len - suffix_len;
1011 if (strcmp(p, suffix))