2 * Copyright 1995-2022 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 static void pem_free(void *p, unsigned int flags, size_t num)
223 if (flags & PEM_FLAG_SECURE)
224 OPENSSL_secure_clear_free(p, num);
229 static void *pem_malloc(int num, unsigned int flags)
231 return (flags & PEM_FLAG_SECURE) ? OPENSSL_secure_malloc(num)
232 : OPENSSL_malloc(num);
235 static int pem_bytes_read_bio_flags(unsigned char **pdata, long *plen,
236 char **pnm, const char *name, BIO *bp,
237 pem_password_cb *cb, void *u,
240 EVP_CIPHER_INFO cipher;
241 char *nm = NULL, *header = NULL;
242 unsigned char *data = NULL;
247 pem_free(nm, flags, 0);
248 pem_free(header, flags, 0);
249 pem_free(data, flags, len);
250 if (!PEM_read_bio_ex(bp, &nm, &header, &data, &len, flags)) {
251 if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE)
252 ERR_add_error_data(2, "Expecting: ", name);
255 } while (!check_pem(nm, name));
256 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
258 if (!PEM_do_header(&cipher, data, &len, cb, u))
270 if (!ret || pnm == NULL)
271 pem_free(nm, flags, 0);
272 pem_free(header, flags, 0);
274 pem_free(data, flags, len);
278 int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
279 const char *name, BIO *bp, pem_password_cb *cb,
281 return pem_bytes_read_bio_flags(pdata, plen, pnm, name, bp, cb, u,
282 PEM_FLAG_EAY_COMPATIBLE);
285 int PEM_bytes_read_bio_secmem(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_SECURE | PEM_FLAG_EAY_COMPATIBLE);
292 #ifndef OPENSSL_NO_STDIO
293 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
294 const void *x, const EVP_CIPHER *enc,
295 const unsigned char *kstr, int klen,
296 pem_password_cb *callback, void *u)
301 if ((b = BIO_new(BIO_s_file())) == NULL) {
302 ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
305 BIO_set_fp(b, fp, BIO_NOCLOSE);
306 ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
312 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
313 const void *x, const EVP_CIPHER *enc,
314 const unsigned char *kstr, int klen,
315 pem_password_cb *callback, void *u)
317 EVP_CIPHER_CTX *ctx = NULL;
318 int dsize = 0, i = 0, j = 0, ret = 0;
319 unsigned char *p, *data = NULL;
320 const char *objstr = NULL;
321 char buf[PEM_BUFSIZE];
322 unsigned char key[EVP_MAX_KEY_LENGTH];
323 unsigned char iv[EVP_MAX_IV_LENGTH];
326 objstr = EVP_CIPHER_get0_name(enc);
327 if (objstr == NULL || EVP_CIPHER_get_iv_length(enc) == 0
328 || EVP_CIPHER_get_iv_length(enc) > (int)sizeof(iv)
330 * Check "Proc-Type: 4,Encrypted\nDEK-Info: objstr,hex-iv\n"
333 || strlen(objstr) + 23 + 2 * EVP_CIPHER_get_iv_length(enc) + 13
335 ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_CIPHER);
340 if ((dsize = i2d(x, NULL)) <= 0) {
341 ERR_raise(ERR_LIB_PEM, ERR_R_ASN1_LIB);
345 /* dsize + 8 bytes are needed */
346 /* actually it needs the cipher block size extra... */
347 data = OPENSSL_malloc((unsigned int)dsize + 20);
349 ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
357 if (callback == NULL)
358 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
360 klen = (*callback) (buf, PEM_BUFSIZE, 1, u);
362 ERR_raise(ERR_LIB_PEM, PEM_R_READ_KEY);
365 #ifdef CHARSET_EBCDIC
366 /* Convert the pass phrase from EBCDIC */
367 ebcdic2ascii(buf, buf, klen);
369 kstr = (unsigned char *)buf;
371 /* Generate a salt */
372 if (RAND_bytes(iv, EVP_CIPHER_get_iv_length(enc)) <= 0)
375 * The 'iv' is used as the iv and as a salt. It is NOT taken from
376 * the BytesToKey function
378 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL))
381 if (kstr == (unsigned char *)buf)
382 OPENSSL_cleanse(buf, PEM_BUFSIZE);
385 PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
386 PEM_dek_info(buf, objstr, EVP_CIPHER_get_iv_length(enc), (char *)iv);
390 if ((ctx = EVP_CIPHER_CTX_new()) == NULL
391 || !EVP_EncryptInit_ex(ctx, enc, NULL, key, iv)
392 || !EVP_EncryptUpdate(ctx, data, &j, data, i)
393 || !EVP_EncryptFinal_ex(ctx, &(data[j]), &i))
402 i = PEM_write_bio(bp, name, buf, data, i);
406 OPENSSL_cleanse(key, sizeof(key));
407 OPENSSL_cleanse(iv, sizeof(iv));
408 EVP_CIPHER_CTX_free(ctx);
409 OPENSSL_cleanse(buf, PEM_BUFSIZE);
410 OPENSSL_clear_free(data, (unsigned int)dsize);
414 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
415 pem_password_cb *callback, void *u)
420 int ilen = (int) len; /* EVP_DecryptUpdate etc. take int lengths */
422 unsigned char key[EVP_MAX_KEY_LENGTH];
423 char buf[PEM_BUFSIZE];
425 #if LONG_MAX > INT_MAX
426 /* Check that we did not truncate the length */
428 ERR_raise(ERR_LIB_PEM, PEM_R_HEADER_TOO_LONG);
433 if (cipher->cipher == NULL)
435 if (callback == NULL)
436 keylen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
438 keylen = callback(buf, PEM_BUFSIZE, 0, u);
440 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_PASSWORD_READ);
443 #ifdef CHARSET_EBCDIC
444 /* Convert the pass phrase from EBCDIC */
445 ebcdic2ascii(buf, buf, keylen);
448 if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
449 (unsigned char *)buf, keylen, 1, key, NULL))
452 ctx = EVP_CIPHER_CTX_new();
456 ok = EVP_DecryptInit_ex(ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
458 ok = EVP_DecryptUpdate(ctx, data, &ilen, data, ilen);
460 /* Squirrel away the length of data decrypted so far. */
462 ok = EVP_DecryptFinal_ex(ctx, &(data[ilen]), &ilen);
467 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_DECRYPT);
469 EVP_CIPHER_CTX_free(ctx);
470 OPENSSL_cleanse((char *)buf, sizeof(buf));
471 OPENSSL_cleanse((char *)key, sizeof(key));
476 * This implements a very limited PEM header parser that does not support the
477 * full grammar of rfc1421. In particular, folded headers are not supported,
478 * nor is additional whitespace.
480 * A robust implementation would make use of a library that turns the headers
481 * into a BIO from which one folded line is read at a time, and is then split
482 * into a header label and content. We would then parse the content of the
483 * headers we care about. This is overkill for just this limited use-case, but
484 * presumably we also parse rfc822-style headers for S/MIME, so a common
485 * abstraction might well be more generally useful.
487 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
489 static const char ProcType[] = "Proc-Type:";
490 static const char ENCRYPTED[] = "ENCRYPTED";
491 static const char DEKInfo[] = "DEK-Info:";
492 const EVP_CIPHER *enc = NULL;
494 char *dekinfostart, c;
496 cipher->cipher = NULL;
497 memset(cipher->iv, 0, sizeof(cipher->iv));
498 if ((header == NULL) || (*header == '\0') || (*header == '\n'))
501 if (strncmp(header, ProcType, sizeof(ProcType)-1) != 0) {
502 ERR_raise(ERR_LIB_PEM, PEM_R_NOT_PROC_TYPE);
505 header += sizeof(ProcType)-1;
506 header += strspn(header, " \t");
508 if (*header++ != '4' || *header++ != ',')
510 header += strspn(header, " \t");
512 /* We expect "ENCRYPTED" followed by optional white-space + line break */
513 if (strncmp(header, ENCRYPTED, sizeof(ENCRYPTED)-1) != 0 ||
514 strspn(header+sizeof(ENCRYPTED)-1, " \t\r\n") == 0) {
515 ERR_raise(ERR_LIB_PEM, PEM_R_NOT_ENCRYPTED);
518 header += sizeof(ENCRYPTED)-1;
519 header += strspn(header, " \t\r");
520 if (*header++ != '\n') {
521 ERR_raise(ERR_LIB_PEM, PEM_R_SHORT_HEADER);
526 * https://tools.ietf.org/html/rfc1421#section-4.6.1.3
527 * We expect "DEK-Info: algo[,hex-parameters]"
529 if (strncmp(header, DEKInfo, sizeof(DEKInfo)-1) != 0) {
530 ERR_raise(ERR_LIB_PEM, PEM_R_NOT_DEK_INFO);
533 header += sizeof(DEKInfo)-1;
534 header += strspn(header, " \t");
537 * DEK-INFO is a comma-separated combination of algorithm name and optional
540 dekinfostart = header;
541 header += strcspn(header, " \t,");
544 cipher->cipher = enc = EVP_get_cipherbyname(dekinfostart);
546 header += strspn(header, " \t");
549 ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_ENCRYPTION);
552 ivlen = EVP_CIPHER_get_iv_length(enc);
553 if (ivlen > 0 && *header++ != ',') {
554 ERR_raise(ERR_LIB_PEM, PEM_R_MISSING_DEK_IV);
556 } else if (ivlen == 0 && *header == ',') {
557 ERR_raise(ERR_LIB_PEM, PEM_R_UNEXPECTED_DEK_IV);
561 if (!load_iv(&header, cipher->iv, EVP_CIPHER_get_iv_length(enc)))
567 static int load_iv(char **fromp, unsigned char *to, int num)
573 for (i = 0; i < num; i++)
576 for (i = 0; i < num; i++) {
577 v = OPENSSL_hexchar2int(*from);
579 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_IV_CHARS);
583 to[i / 2] |= v << (long)((!(i & 1)) * 4);
590 #ifndef OPENSSL_NO_STDIO
591 int PEM_write(FILE *fp, const char *name, const char *header,
592 const unsigned char *data, long len)
597 if ((b = BIO_new(BIO_s_file())) == NULL) {
598 ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
601 BIO_set_fp(b, fp, BIO_NOCLOSE);
602 ret = PEM_write_bio(b, name, header, data, len);
608 int PEM_write_bio(BIO *bp, const char *name, const char *header,
609 const unsigned char *data, long len)
611 int nlen, n, i, j, outl;
612 unsigned char *buf = NULL;
613 EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new();
614 int reason = ERR_R_BUF_LIB;
618 reason = ERR_R_MALLOC_FAILURE;
625 if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
626 (BIO_write(bp, name, nlen) != nlen) ||
627 (BIO_write(bp, "-----\n", 6) != 6))
632 if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
636 buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
638 reason = ERR_R_MALLOC_FAILURE;
644 n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
645 if (!EVP_EncodeUpdate(ctx, buf, &outl, &(data[j]), n))
647 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
653 EVP_EncodeFinal(ctx, buf, &outl);
654 if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
656 if ((BIO_write(bp, "-----END ", 9) != 9) ||
657 (BIO_write(bp, name, nlen) != nlen) ||
658 (BIO_write(bp, "-----\n", 6) != 6))
664 ERR_raise(ERR_LIB_PEM, reason);
665 EVP_ENCODE_CTX_free(ctx);
666 OPENSSL_clear_free(buf, PEM_BUFSIZE * 8);
670 #ifndef OPENSSL_NO_STDIO
671 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
677 if ((b = BIO_new(BIO_s_file())) == NULL) {
678 ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
681 BIO_set_fp(b, fp, BIO_NOCLOSE);
682 ret = PEM_read_bio(b, name, header, data, len);
688 /* Some helpers for PEM_read_bio_ex(). */
689 static int sanitize_line(char *linebuf, int len, unsigned int flags, int first_call)
693 /* Other BOMs imply unsupported multibyte encoding,
694 * so don't strip them and let the error raise */
695 const unsigned char utf8_bom[3] = {0xEF, 0xBB, 0xBF};
697 if (len > 3 && memcmp(linebuf, utf8_bom, 3) == 0) {
698 memmove(linebuf, linebuf + 3, len - 3);
699 linebuf[len - 3] = 0;
704 if (flags & PEM_FLAG_EAY_COMPATIBLE) {
705 /* Strip trailing whitespace */
706 while ((len >= 0) && (linebuf[len] <= ' '))
708 /* Go back to whitespace before applying uniform line ending. */
710 } else if (flags & PEM_FLAG_ONLY_B64) {
711 for (i = 0; i < len; ++i) {
712 if (!ossl_isbase64(linebuf[i]) || linebuf[i] == '\n'
713 || linebuf[i] == '\r')
718 /* EVP_DecodeBlock strips leading and trailing whitespace, so just strip
719 * control characters in-place and let everything through. */
720 for (i = 0; i < len; ++i) {
721 if (linebuf[i] == '\n' || linebuf[i] == '\r')
723 if (ossl_iscntrl(linebuf[i]))
728 /* The caller allocated LINESIZE+1, so this is safe. */
729 linebuf[len++] = '\n';
735 /* Note trailing spaces for begin and end. */
736 static const char beginstr[] = "-----BEGIN ";
737 static const char endstr[] = "-----END ";
738 static const char tailstr[] = "-----\n";
739 #define BEGINLEN ((int)(sizeof(beginstr) - 1))
740 #define ENDLEN ((int)(sizeof(endstr) - 1))
741 #define TAILLEN ((int)(sizeof(tailstr) - 1))
742 static int get_name(BIO *bp, char **name, unsigned int flags)
750 * Need to hold trailing NUL (accounted for by BIO_gets() and the newline
751 * that will be added by sanitize_line() (the extra '1').
753 linebuf = pem_malloc(LINESIZE + 1, flags);
754 if (linebuf == NULL) {
755 ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
760 len = BIO_gets(bp, linebuf, LINESIZE);
763 ERR_raise(ERR_LIB_PEM, PEM_R_NO_START_LINE);
767 /* Strip trailing garbage and standardize ending. */
768 len = sanitize_line(linebuf, len, flags & ~PEM_FLAG_ONLY_B64, first_call);
771 /* Allow leading empty or non-matching lines. */
772 } while (strncmp(linebuf, beginstr, BEGINLEN) != 0
774 || strncmp(linebuf + len - TAILLEN, tailstr, TAILLEN) != 0);
775 linebuf[len - TAILLEN] = '\0';
776 len = len - BEGINLEN - TAILLEN + 1;
777 *name = pem_malloc(len, flags);
779 ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
782 memcpy(*name, linebuf + BEGINLEN, len);
786 pem_free(linebuf, flags, LINESIZE + 1);
790 /* Keep track of how much of a header we've seen. */
798 * Extract the optional PEM header, with details on the type of content and
799 * any encryption used on the contents, and the bulk of the data from the bio.
800 * The end of the header is marked by a blank line; if the end-of-input marker
801 * is reached prior to a blank line, there is no header.
803 * The header and data arguments are BIO** since we may have to swap them
804 * if there is no header, for efficiency.
806 * We need the name of the PEM-encoded type to verify the end string.
808 static int get_header_and_data(BIO *bp, BIO **header, BIO **data, char *name,
813 int len, line, ret = 0, end = 0, prev_partial_line_read = 0, partial_line_read = 0;
814 /* 0 if not seen (yet), 1 if reading header, 2 if finished header */
815 enum header_status got_header = MAYBE_HEADER;
816 unsigned int flags_mask;
819 /* Need to hold trailing NUL (accounted for by BIO_gets() and the newline
820 * that will be added by sanitize_line() (the extra '1'). */
821 linebuf = pem_malloc(LINESIZE + 1, flags);
822 if (linebuf == NULL) {
823 ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
827 for (line = 0; ; line++) {
829 len = BIO_gets(bp, linebuf, LINESIZE);
831 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_END_LINE);
836 * Check if line has been read completely or if only part of the line
837 * has been read. Keep the previous value to ignore newlines that
838 * appear due to reading a line up until the char before the newline.
840 prev_partial_line_read = partial_line_read;
841 partial_line_read = len == LINESIZE-1 && linebuf[LINESIZE-2] != '\n';
843 if (got_header == MAYBE_HEADER) {
844 if (memchr(linebuf, ':', len) != NULL)
845 got_header = IN_HEADER;
847 if (!strncmp(linebuf, endstr, ENDLEN) || got_header == IN_HEADER)
848 flags_mask &= ~PEM_FLAG_ONLY_B64;
849 len = sanitize_line(linebuf, len, flags & flags_mask, 0);
851 /* Check for end of header. */
852 if (linebuf[0] == '\n') {
854 * If previous line has been read only partially this newline is a
855 * regular newline at the end of a line and not an empty line.
857 if (!prev_partial_line_read) {
858 if (got_header == POST_HEADER) {
859 /* Another blank line is an error. */
860 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_END_LINE);
863 got_header = POST_HEADER;
869 /* Check for end of stream (which means there is no header). */
870 if (strncmp(linebuf, endstr, ENDLEN) == 0) {
871 p = linebuf + ENDLEN;
872 namelen = strlen(name);
873 if (strncmp(p, name, namelen) != 0 ||
874 strncmp(p + namelen, tailstr, TAILLEN) != 0) {
875 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_END_LINE);
878 if (got_header == MAYBE_HEADER) {
884 /* Malformed input; short line not at end of data. */
885 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_END_LINE);
889 * Else, a line of text -- could be header or data; we don't
890 * know yet. Just pass it through.
892 if (BIO_puts(tmp, linebuf) < 0)
895 * Only encrypted files need the line length check applied.
897 if (got_header == POST_HEADER) {
898 /* 65 includes the trailing newline */
908 pem_free(linebuf, flags, LINESIZE + 1);
913 * Read in PEM-formatted data from the given BIO.
915 * By nature of the PEM format, all content must be printable ASCII (except
916 * for line endings). Other characters are malformed input and will be rejected.
918 int PEM_read_bio_ex(BIO *bp, char **name_out, char **header,
919 unsigned char **data, long *len_out, unsigned int flags)
921 EVP_ENCODE_CTX *ctx = NULL;
922 const BIO_METHOD *bmeth;
923 BIO *headerB = NULL, *dataB = NULL;
925 int len, taillen, headerlen, ret = 0;
929 *name_out = *header = NULL;
931 if ((flags & PEM_FLAG_EAY_COMPATIBLE) && (flags & PEM_FLAG_ONLY_B64)) {
932 /* These two are mutually incompatible; bail out. */
933 ERR_raise(ERR_LIB_PEM, ERR_R_PASSED_INVALID_ARGUMENT);
936 bmeth = (flags & PEM_FLAG_SECURE) ? BIO_s_secmem() : BIO_s_mem();
938 headerB = BIO_new(bmeth);
939 dataB = BIO_new(bmeth);
940 if (headerB == NULL || dataB == NULL) {
941 ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
945 if (!get_name(bp, &name, flags))
947 if (!get_header_and_data(bp, &headerB, &dataB, name, flags))
950 BIO_get_mem_ptr(dataB, &buf_mem);
951 len = buf_mem->length;
953 /* There was no data in the PEM file */
957 ctx = EVP_ENCODE_CTX_new();
959 ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
964 if (EVP_DecodeUpdate(ctx, (unsigned char*)buf_mem->data, &len,
965 (unsigned char*)buf_mem->data, len) < 0
966 || EVP_DecodeFinal(ctx, (unsigned char*)&(buf_mem->data[len]),
968 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_BASE64_DECODE);
972 buf_mem->length = len;
974 headerlen = BIO_get_mem_data(headerB, NULL);
975 *header = pem_malloc(headerlen + 1, flags);
976 *data = pem_malloc(len, flags);
977 if (*header == NULL || *data == NULL)
979 if (headerlen != 0 && BIO_read(headerB, *header, headerlen) != headerlen)
981 (*header)[headerlen] = '\0';
982 if (BIO_read(dataB, *data, len) != len)
991 pem_free(*header, flags, 0);
992 pem_free(*data, flags, 0);
994 EVP_ENCODE_CTX_free(ctx);
995 pem_free(name, flags, 0);
1001 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
1004 return PEM_read_bio_ex(bp, name, header, data, len, PEM_FLAG_EAY_COMPATIBLE);
1008 * Check pem string and return prefix length. If for example the pem_str ==
1009 * "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the
1013 int ossl_pem_check_suffix(const char *pem_str, const char *suffix)
1015 int pem_len = strlen(pem_str);
1016 int suffix_len = strlen(suffix);
1018 if (suffix_len + 1 >= pem_len)
1020 p = pem_str + pem_len - suffix_len;
1021 if (strcmp(p, suffix))