2 * Copyright 1995-2023 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
10 /* We need to use some engine deprecated APIs */
11 #define OPENSSL_SUPPRESS_DEPRECATED
14 #include "crypto/ctype.h"
16 #include "internal/cryptlib.h"
17 #include <openssl/buffer.h>
18 #include <openssl/objects.h>
19 #include <openssl/evp.h>
20 #include <openssl/rand.h>
21 #include <openssl/x509.h>
22 #include <openssl/pem.h>
23 #include <openssl/pkcs12.h>
24 #include "crypto/asn1.h"
25 #include <openssl/des.h>
26 #include <openssl/engine.h>
30 static int load_iv(char **fromp, unsigned char *to, int num);
31 static int check_pem(const char *nm, const char *name);
32 int ossl_pem_check_suffix(const char *pem_str, const char *suffix);
34 int PEM_def_callback(char *buf, int num, int rwflag, void *userdata)
39 /* We assume that the user passes a default password as userdata */
42 i = (i > num) ? num : i;
43 memcpy(buf, userdata, i);
47 prompt = EVP_get_pw_prompt();
49 prompt = "Enter PEM pass phrase:";
52 * rwflag == 0 means decryption
53 * rwflag == 1 means encryption
55 * We assume that for encryption, we want a minimum length, while for
56 * decryption, we cannot know any minimum length, so we assume zero.
58 min_len = rwflag ? MIN_LENGTH : 0;
60 i = EVP_read_pw_string_min(buf, min_len, num, prompt, rwflag);
62 ERR_raise(ERR_LIB_PEM, PEM_R_PROBLEMS_GETTING_PASSWORD);
63 memset(buf, 0, (unsigned int)num);
69 void PEM_proc_type(char *buf, int type)
72 char *p = buf + strlen(buf);
74 if (type == PEM_TYPE_ENCRYPTED)
76 else if (type == PEM_TYPE_MIC_CLEAR)
78 else if (type == PEM_TYPE_MIC_ONLY)
83 BIO_snprintf(p, PEM_BUFSIZE - (size_t)(p - buf), "Proc-Type: 4,%s\n", str);
86 void PEM_dek_info(char *buf, const char *type, int len, const char *str)
89 char *p = buf + strlen(buf);
90 int j = PEM_BUFSIZE - (size_t)(p - buf), n;
92 n = BIO_snprintf(p, j, "DEK-Info: %s,", type);
96 for (i = 0; i < len; i++) {
97 n = BIO_snprintf(p, j, "%02X", 0xff & str[i]);
108 #ifndef OPENSSL_NO_STDIO
109 void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
110 pem_password_cb *cb, void *u)
115 if ((b = BIO_new(BIO_s_file())) == NULL) {
116 ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
119 BIO_set_fp(b, fp, BIO_NOCLOSE);
120 ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
126 static int check_pem(const char *nm, const char *name)
128 /* Normal matching nm and name */
129 if (strcmp(nm, name) == 0)
132 /* Make PEM_STRING_EVP_PKEY match any private key */
134 if (strcmp(name, PEM_STRING_EVP_PKEY) == 0) {
136 const EVP_PKEY_ASN1_METHOD *ameth;
137 if (strcmp(nm, PEM_STRING_PKCS8) == 0)
139 if (strcmp(nm, PEM_STRING_PKCS8INF) == 0)
141 slen = ossl_pem_check_suffix(nm, "PRIVATE KEY");
144 * NB: ENGINE implementations won't contain a deprecated old
145 * private key decode function so don't look for them.
147 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
148 if (ameth && ameth->old_priv_decode)
154 if (strcmp(name, PEM_STRING_PARAMETERS) == 0) {
156 const EVP_PKEY_ASN1_METHOD *ameth;
157 slen = ossl_pem_check_suffix(nm, "PARAMETERS");
160 ameth = EVP_PKEY_asn1_find_str(&e, nm, slen);
163 if (ameth->param_decode)
167 #ifndef OPENSSL_NO_ENGINE
175 /* If reading DH parameters handle X9.42 DH format too */
176 if (strcmp(nm, PEM_STRING_DHXPARAMS) == 0
177 && strcmp(name, PEM_STRING_DHPARAMS) == 0)
180 /* Permit older strings */
182 if (strcmp(nm, PEM_STRING_X509_OLD) == 0
183 && strcmp(name, PEM_STRING_X509) == 0)
186 if (strcmp(nm, PEM_STRING_X509_REQ_OLD) == 0
187 && strcmp(name, PEM_STRING_X509_REQ) == 0)
190 /* Allow normal certs to be read as trusted certs */
191 if (strcmp(nm, PEM_STRING_X509) == 0
192 && strcmp(name, PEM_STRING_X509_TRUSTED) == 0)
195 if (strcmp(nm, PEM_STRING_X509_OLD) == 0
196 && strcmp(name, PEM_STRING_X509_TRUSTED) == 0)
199 /* Some CAs use PKCS#7 with CERTIFICATE headers */
200 if (strcmp(nm, PEM_STRING_X509) == 0
201 && strcmp(name, PEM_STRING_PKCS7) == 0)
204 if (strcmp(nm, PEM_STRING_PKCS7_SIGNED) == 0
205 && strcmp(name, PEM_STRING_PKCS7) == 0)
208 #ifndef OPENSSL_NO_CMS
209 if (strcmp(nm, PEM_STRING_X509) == 0
210 && strcmp(name, PEM_STRING_CMS) == 0)
212 /* Allow CMS to be read from PKCS#7 headers */
213 if (strcmp(nm, PEM_STRING_PKCS7) == 0
214 && strcmp(name, PEM_STRING_CMS) == 0)
221 #define PEM_FREE(p, flags, num) \
222 pem_free((p), (flags), (num), OPENSSL_FILE, OPENSSL_LINE)
223 static void pem_free(void *p, unsigned int flags, size_t num,
224 const char *file, int line)
226 if (flags & PEM_FLAG_SECURE)
227 CRYPTO_secure_clear_free(p, num, file, line);
229 CRYPTO_free(p, file, line);
232 #define PEM_MALLOC(num, flags) \
233 pem_malloc((num), (flags), OPENSSL_FILE, OPENSSL_LINE)
234 static void *pem_malloc(int num, unsigned int flags,
235 const char *file, int line)
237 return (flags & PEM_FLAG_SECURE) ? CRYPTO_secure_malloc(num, file, line)
238 : CRYPTO_malloc(num, file, line);
242 static int pem_bytes_read_bio_flags(unsigned char **pdata, long *plen,
243 char **pnm, const char *name, BIO *bp,
244 pem_password_cb *cb, void *u,
247 EVP_CIPHER_INFO cipher;
248 char *nm = NULL, *header = NULL;
249 unsigned char *data = NULL;
254 PEM_FREE(nm, flags, 0);
255 PEM_FREE(header, flags, 0);
256 PEM_FREE(data, flags, len);
257 if (!PEM_read_bio_ex(bp, &nm, &header, &data, &len, flags)) {
258 if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE)
259 ERR_add_error_data(2, "Expecting: ", name);
262 } while (!check_pem(nm, name));
263 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
265 if (!PEM_do_header(&cipher, data, &len, cb, u))
277 if (!ret || pnm == NULL)
278 PEM_FREE(nm, flags, 0);
279 PEM_FREE(header, flags, 0);
281 PEM_FREE(data, flags, len);
285 int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
286 const char *name, BIO *bp, pem_password_cb *cb,
288 return pem_bytes_read_bio_flags(pdata, plen, pnm, name, bp, cb, u,
289 PEM_FLAG_EAY_COMPATIBLE);
292 int PEM_bytes_read_bio_secmem(unsigned char **pdata, long *plen, char **pnm,
293 const char *name, BIO *bp, pem_password_cb *cb,
295 return pem_bytes_read_bio_flags(pdata, plen, pnm, name, bp, cb, u,
296 PEM_FLAG_SECURE | PEM_FLAG_EAY_COMPATIBLE);
299 #ifndef OPENSSL_NO_STDIO
300 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
301 const void *x, const EVP_CIPHER *enc,
302 const unsigned char *kstr, int klen,
303 pem_password_cb *callback, void *u)
308 if ((b = BIO_new(BIO_s_file())) == NULL) {
309 ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
312 BIO_set_fp(b, fp, BIO_NOCLOSE);
313 ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
319 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
320 const void *x, const EVP_CIPHER *enc,
321 const unsigned char *kstr, int klen,
322 pem_password_cb *callback, void *u)
324 EVP_CIPHER_CTX *ctx = NULL;
325 int dsize = 0, i = 0, j = 0, ret = 0;
326 unsigned char *p, *data = NULL;
327 const char *objstr = NULL;
328 char buf[PEM_BUFSIZE];
329 unsigned char key[EVP_MAX_KEY_LENGTH];
330 unsigned char iv[EVP_MAX_IV_LENGTH];
333 objstr = EVP_CIPHER_get0_name(enc);
334 if (objstr == NULL || EVP_CIPHER_get_iv_length(enc) == 0
335 || EVP_CIPHER_get_iv_length(enc) > (int)sizeof(iv)
337 * Check "Proc-Type: 4,Encrypted\nDEK-Info: objstr,hex-iv\n"
340 || strlen(objstr) + 23 + 2 * EVP_CIPHER_get_iv_length(enc) + 13
342 ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_CIPHER);
347 if ((dsize = i2d(x, NULL)) <= 0) {
348 ERR_raise(ERR_LIB_PEM, ERR_R_ASN1_LIB);
352 /* dsize + 8 bytes are needed */
353 /* actually it needs the cipher block size extra... */
354 data = OPENSSL_malloc((unsigned int)dsize + 20);
362 if (callback == NULL)
363 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
365 klen = (*callback) (buf, PEM_BUFSIZE, 1, u);
367 ERR_raise(ERR_LIB_PEM, PEM_R_READ_KEY);
370 #ifdef CHARSET_EBCDIC
371 /* Convert the pass phrase from EBCDIC */
372 ebcdic2ascii(buf, buf, klen);
374 kstr = (unsigned char *)buf;
376 /* Generate a salt */
377 if (RAND_bytes(iv, EVP_CIPHER_get_iv_length(enc)) <= 0)
380 * The 'iv' is used as the iv and as a salt. It is NOT taken from
381 * the BytesToKey function
383 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL))
386 if (kstr == (unsigned char *)buf)
387 OPENSSL_cleanse(buf, PEM_BUFSIZE);
390 PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
391 PEM_dek_info(buf, objstr, EVP_CIPHER_get_iv_length(enc), (char *)iv);
395 if ((ctx = EVP_CIPHER_CTX_new()) == NULL
396 || !EVP_EncryptInit_ex(ctx, enc, NULL, key, iv)
397 || !EVP_EncryptUpdate(ctx, data, &j, data, i)
398 || !EVP_EncryptFinal_ex(ctx, &(data[j]), &i))
407 i = PEM_write_bio(bp, name, buf, data, i);
411 OPENSSL_cleanse(key, sizeof(key));
412 OPENSSL_cleanse(iv, sizeof(iv));
413 EVP_CIPHER_CTX_free(ctx);
414 OPENSSL_cleanse(buf, PEM_BUFSIZE);
415 OPENSSL_clear_free(data, (unsigned int)dsize);
419 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
420 pem_password_cb *callback, void *u)
425 int ilen = (int) len; /* EVP_DecryptUpdate etc. take int lengths */
427 unsigned char key[EVP_MAX_KEY_LENGTH];
428 char buf[PEM_BUFSIZE];
430 #if LONG_MAX > INT_MAX
431 /* Check that we did not truncate the length */
433 ERR_raise(ERR_LIB_PEM, PEM_R_HEADER_TOO_LONG);
438 if (cipher->cipher == NULL)
440 if (callback == NULL)
441 keylen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
443 keylen = callback(buf, PEM_BUFSIZE, 0, u);
445 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_PASSWORD_READ);
448 #ifdef CHARSET_EBCDIC
449 /* Convert the pass phrase from EBCDIC */
450 ebcdic2ascii(buf, buf, keylen);
453 if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
454 (unsigned char *)buf, keylen, 1, key, NULL))
457 ctx = EVP_CIPHER_CTX_new();
461 ok = EVP_DecryptInit_ex(ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
463 ok = EVP_DecryptUpdate(ctx, data, &ilen, data, ilen);
465 /* Squirrel away the length of data decrypted so far. */
467 ok = EVP_DecryptFinal_ex(ctx, &(data[ilen]), &ilen);
472 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_DECRYPT);
474 EVP_CIPHER_CTX_free(ctx);
475 OPENSSL_cleanse((char *)buf, sizeof(buf));
476 OPENSSL_cleanse((char *)key, sizeof(key));
481 * This implements a very limited PEM header parser that does not support the
482 * full grammar of rfc1421. In particular, folded headers are not supported,
483 * nor is additional whitespace.
485 * A robust implementation would make use of a library that turns the headers
486 * into a BIO from which one folded line is read at a time, and is then split
487 * into a header label and content. We would then parse the content of the
488 * headers we care about. This is overkill for just this limited use-case, but
489 * presumably we also parse rfc822-style headers for S/MIME, so a common
490 * abstraction might well be more generally useful.
492 #define PROC_TYPE "Proc-Type:"
493 #define ENCRYPTED "ENCRYPTED"
494 #define DEK_INFO "DEK-Info:"
495 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
497 const EVP_CIPHER *enc = NULL;
499 char *dekinfostart, c;
501 cipher->cipher = NULL;
502 memset(cipher->iv, 0, sizeof(cipher->iv));
503 if ((header == NULL) || (*header == '\0') || (*header == '\n'))
506 if (!CHECK_AND_SKIP_PREFIX(header, PROC_TYPE)) {
507 ERR_raise(ERR_LIB_PEM, PEM_R_NOT_PROC_TYPE);
510 header += strspn(header, " \t");
512 if (*header++ != '4' || *header++ != ',')
514 header += strspn(header, " \t");
516 /* We expect "ENCRYPTED" followed by optional white-space + line break */
517 if (!CHECK_AND_SKIP_PREFIX(header, ENCRYPTED) ||
518 strspn(header, " \t\r\n") == 0) {
519 ERR_raise(ERR_LIB_PEM, PEM_R_NOT_ENCRYPTED);
522 header += strspn(header, " \t\r");
523 if (*header++ != '\n') {
524 ERR_raise(ERR_LIB_PEM, PEM_R_SHORT_HEADER);
529 * https://tools.ietf.org/html/rfc1421#section-4.6.1.3
530 * We expect "DEK-Info: algo[,hex-parameters]"
532 if (!CHECK_AND_SKIP_PREFIX(header, DEK_INFO)) {
533 ERR_raise(ERR_LIB_PEM, PEM_R_NOT_DEK_INFO);
536 header += strspn(header, " \t");
539 * DEK-INFO is a comma-separated combination of algorithm name and optional
542 dekinfostart = header;
543 header += strcspn(header, " \t,");
546 cipher->cipher = enc = EVP_get_cipherbyname(dekinfostart);
548 header += strspn(header, " \t");
551 ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_ENCRYPTION);
554 ivlen = EVP_CIPHER_get_iv_length(enc);
555 if (ivlen > 0 && *header++ != ',') {
556 ERR_raise(ERR_LIB_PEM, PEM_R_MISSING_DEK_IV);
558 } else if (ivlen == 0 && *header == ',') {
559 ERR_raise(ERR_LIB_PEM, PEM_R_UNEXPECTED_DEK_IV);
563 if (!load_iv(&header, cipher->iv, EVP_CIPHER_get_iv_length(enc)))
569 static int load_iv(char **fromp, unsigned char *to, int num)
575 for (i = 0; i < num; i++)
578 for (i = 0; i < num; i++) {
579 v = OPENSSL_hexchar2int(*from);
581 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_IV_CHARS);
585 to[i / 2] |= v << (long)((!(i & 1)) * 4);
592 #ifndef OPENSSL_NO_STDIO
593 int PEM_write(FILE *fp, const char *name, const char *header,
594 const unsigned char *data, long len)
599 if ((b = BIO_new(BIO_s_file())) == NULL) {
600 ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
603 BIO_set_fp(b, fp, BIO_NOCLOSE);
604 ret = PEM_write_bio(b, name, header, data, len);
610 int PEM_write_bio(BIO *bp, const char *name, const char *header,
611 const unsigned char *data, long len)
613 int nlen, n, i, j, outl;
614 unsigned char *buf = NULL;
615 EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new();
620 reason = ERR_R_EVP_LIB;
627 if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
628 (BIO_write(bp, name, nlen) != nlen) ||
629 (BIO_write(bp, "-----\n", 6) != 6)) {
630 reason = ERR_R_BIO_LIB;
634 i = header != NULL ? strlen(header) : 0;
636 if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1)) {
637 reason = ERR_R_BIO_LIB;
642 buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
648 n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
649 if (!EVP_EncodeUpdate(ctx, buf, &outl, &(data[j]), n)) {
650 reason = ERR_R_EVP_LIB;
653 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl)) {
654 reason = ERR_R_BIO_LIB;
661 EVP_EncodeFinal(ctx, buf, &outl);
662 if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl)) {
663 reason = ERR_R_BIO_LIB;
666 if ((BIO_write(bp, "-----END ", 9) != 9) ||
667 (BIO_write(bp, name, nlen) != nlen) ||
668 (BIO_write(bp, "-----\n", 6) != 6)) {
669 reason = ERR_R_BIO_LIB;
675 if (retval == 0 && reason != 0)
676 ERR_raise(ERR_LIB_PEM, reason);
677 EVP_ENCODE_CTX_free(ctx);
678 OPENSSL_clear_free(buf, PEM_BUFSIZE * 8);
682 #ifndef OPENSSL_NO_STDIO
683 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
689 if ((b = BIO_new(BIO_s_file())) == NULL) {
690 ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
693 BIO_set_fp(b, fp, BIO_NOCLOSE);
694 ret = PEM_read_bio(b, name, header, data, len);
700 /* Some helpers for PEM_read_bio_ex(). */
701 static int sanitize_line(char *linebuf, int len, unsigned int flags, int first_call)
705 /* Other BOMs imply unsupported multibyte encoding,
706 * so don't strip them and let the error raise */
707 const unsigned char utf8_bom[3] = {0xEF, 0xBB, 0xBF};
709 if (len > 3 && memcmp(linebuf, utf8_bom, 3) == 0) {
710 memmove(linebuf, linebuf + 3, len - 3);
711 linebuf[len - 3] = 0;
716 if (flags & PEM_FLAG_EAY_COMPATIBLE) {
717 /* Strip trailing whitespace */
718 while ((len >= 0) && (linebuf[len] <= ' '))
720 /* Go back to whitespace before applying uniform line ending. */
722 } else if (flags & PEM_FLAG_ONLY_B64) {
723 for (i = 0; i < len; ++i) {
724 if (!ossl_isbase64(linebuf[i]) || linebuf[i] == '\n'
725 || linebuf[i] == '\r')
730 /* EVP_DecodeBlock strips leading and trailing whitespace, so just strip
731 * control characters in-place and let everything through. */
732 for (i = 0; i < len; ++i) {
733 if (linebuf[i] == '\n' || linebuf[i] == '\r')
735 if (ossl_iscntrl(linebuf[i]))
740 /* The caller allocated LINESIZE+1, so this is safe. */
741 linebuf[len++] = '\n';
747 /* Note trailing spaces for begin and end. */
748 #define BEGINSTR "-----BEGIN "
749 #define ENDSTR "-----END "
750 #define TAILSTR "-----\n"
751 #define BEGINLEN ((int)(sizeof(BEGINSTR) - 1))
752 #define ENDLEN ((int)(sizeof(ENDSTR) - 1))
753 #define TAILLEN ((int)(sizeof(TAILSTR) - 1))
754 static int get_name(BIO *bp, char **name, unsigned int flags)
762 * Need to hold trailing NUL (accounted for by BIO_gets() and the newline
763 * that will be added by sanitize_line() (the extra '1').
765 linebuf = PEM_MALLOC(LINESIZE + 1, flags);
770 len = BIO_gets(bp, linebuf, LINESIZE);
773 ERR_raise(ERR_LIB_PEM, PEM_R_NO_START_LINE);
777 /* Strip trailing garbage and standardize ending. */
778 len = sanitize_line(linebuf, len, flags & ~PEM_FLAG_ONLY_B64, first_call);
781 /* Allow leading empty or non-matching lines. */
782 } while (!HAS_PREFIX(linebuf, BEGINSTR)
784 || !HAS_PREFIX(linebuf + len - TAILLEN, TAILSTR));
785 linebuf[len - TAILLEN] = '\0';
786 len = len - BEGINLEN - TAILLEN + 1;
787 *name = PEM_MALLOC(len, flags);
790 memcpy(*name, linebuf + BEGINLEN, len);
794 PEM_FREE(linebuf, flags, LINESIZE + 1);
798 /* Keep track of how much of a header we've seen. */
806 * Extract the optional PEM header, with details on the type of content and
807 * any encryption used on the contents, and the bulk of the data from the bio.
808 * The end of the header is marked by a blank line; if the end-of-input marker
809 * is reached prior to a blank line, there is no header.
811 * The header and data arguments are BIO** since we may have to swap them
812 * if there is no header, for efficiency.
814 * We need the name of the PEM-encoded type to verify the end string.
816 static int get_header_and_data(BIO *bp, BIO **header, BIO **data, char *name,
821 int len, ret = 0, end = 0, prev_partial_line_read = 0, partial_line_read = 0;
822 /* 0 if not seen (yet), 1 if reading header, 2 if finished header */
823 enum header_status got_header = MAYBE_HEADER;
824 unsigned int flags_mask;
827 /* Need to hold trailing NUL (accounted for by BIO_gets() and the newline
828 * that will be added by sanitize_line() (the extra '1'). */
829 linebuf = PEM_MALLOC(LINESIZE + 1, flags);
835 len = BIO_gets(bp, linebuf, LINESIZE);
837 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_END_LINE);
842 * Check if line has been read completely or if only part of the line
843 * has been read. Keep the previous value to ignore newlines that
844 * appear due to reading a line up until the char before the newline.
846 prev_partial_line_read = partial_line_read;
847 partial_line_read = len == LINESIZE-1 && linebuf[LINESIZE-2] != '\n';
849 if (got_header == MAYBE_HEADER) {
850 if (memchr(linebuf, ':', len) != NULL)
851 got_header = IN_HEADER;
853 if (HAS_PREFIX(linebuf, ENDSTR) || got_header == IN_HEADER)
854 flags_mask &= ~PEM_FLAG_ONLY_B64;
855 len = sanitize_line(linebuf, len, flags & flags_mask, 0);
857 /* Check for end of header. */
858 if (linebuf[0] == '\n') {
860 * If previous line has been read only partially this newline is a
861 * regular newline at the end of a line and not an empty line.
863 if (!prev_partial_line_read) {
864 if (got_header == POST_HEADER) {
865 /* Another blank line is an error. */
866 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_END_LINE);
869 got_header = POST_HEADER;
875 /* Check for end of stream (which means there is no header). */
877 if (CHECK_AND_SKIP_PREFIX(p, ENDSTR)) {
878 namelen = strlen(name);
879 if (strncmp(p, name, namelen) != 0 ||
880 !HAS_PREFIX(p + namelen, TAILSTR)) {
881 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_END_LINE);
884 if (got_header == MAYBE_HEADER) {
890 /* Malformed input; short line not at end of data. */
891 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_END_LINE);
895 * Else, a line of text -- could be header or data; we don't
896 * know yet. Just pass it through.
898 if (BIO_puts(tmp, linebuf) < 0)
901 * Only encrypted files need the line length check applied.
903 if (got_header == POST_HEADER) {
904 /* 65 includes the trailing newline */
914 PEM_FREE(linebuf, flags, LINESIZE + 1);
919 * Read in PEM-formatted data from the given BIO.
921 * By nature of the PEM format, all content must be printable ASCII (except
922 * for line endings). Other characters are malformed input and will be rejected.
924 int PEM_read_bio_ex(BIO *bp, char **name_out, char **header,
925 unsigned char **data, long *len_out, unsigned int flags)
927 EVP_ENCODE_CTX *ctx = NULL;
928 const BIO_METHOD *bmeth;
929 BIO *headerB = NULL, *dataB = NULL;
931 int len, taillen, headerlen, ret = 0;
935 *name_out = *header = NULL;
937 if ((flags & PEM_FLAG_EAY_COMPATIBLE) && (flags & PEM_FLAG_ONLY_B64)) {
938 /* These two are mutually incompatible; bail out. */
939 ERR_raise(ERR_LIB_PEM, ERR_R_PASSED_INVALID_ARGUMENT);
942 bmeth = (flags & PEM_FLAG_SECURE) ? BIO_s_secmem() : BIO_s_mem();
944 headerB = BIO_new(bmeth);
945 dataB = BIO_new(bmeth);
946 if (headerB == NULL || dataB == NULL) {
947 ERR_raise(ERR_LIB_PEM, ERR_R_BIO_LIB);
951 if (!get_name(bp, &name, flags))
953 if (!get_header_and_data(bp, &headerB, &dataB, name, flags))
956 BIO_get_mem_ptr(dataB, &buf_mem);
957 len = buf_mem->length;
959 /* There was no data in the PEM file */
963 ctx = EVP_ENCODE_CTX_new();
965 ERR_raise(ERR_LIB_PEM, ERR_R_EVP_LIB);
970 if (EVP_DecodeUpdate(ctx, (unsigned char*)buf_mem->data, &len,
971 (unsigned char*)buf_mem->data, len) < 0
972 || EVP_DecodeFinal(ctx, (unsigned char*)&(buf_mem->data[len]),
974 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_BASE64_DECODE);
978 buf_mem->length = len;
980 headerlen = BIO_get_mem_data(headerB, NULL);
981 *header = PEM_MALLOC(headerlen + 1, flags);
982 *data = PEM_MALLOC(len, flags);
983 if (*header == NULL || *data == NULL)
985 if (headerlen != 0 && BIO_read(headerB, *header, headerlen) != headerlen)
987 (*header)[headerlen] = '\0';
988 if (BIO_read(dataB, *data, len) != len)
997 PEM_FREE(*header, flags, 0);
999 PEM_FREE(*data, flags, 0);
1002 EVP_ENCODE_CTX_free(ctx);
1003 PEM_FREE(name, flags, 0);
1009 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
1012 return PEM_read_bio_ex(bp, name, header, data, len, PEM_FLAG_EAY_COMPATIBLE);
1016 * Check pem string and return prefix length. If for example the pem_str ==
1017 * "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the
1021 int ossl_pem_check_suffix(const char *pem_str, const char *suffix)
1023 int pem_len = strlen(pem_str);
1024 int suffix_len = strlen(suffix);
1026 if (suffix_len + 1 >= pem_len)
1028 p = pem_str + pem_len - suffix_len;
1029 if (strcmp(p, suffix))