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openssl/crypto/pem/pem_lib.c
Dr. Stephen Henson 6dfa55ab2f Reject inappropriate private key encryption ciphers. 
The traditional private key encryption algorithm doesn't function
properly if the IV length of the cipher is zero. These ciphers
(e.g. ECB mode) are not suitable for private key encryption
anyway.

Reviewed-by: Emilia Käsper <emilia@openssl.org>
(cherry picked from commit d78df5dfd6)
2016-04-28 00:07:20 +01:00

860 lines
24 KiB
C
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/* crypto/pem/pem_lib.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include <ctype.h>
#include "cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/pkcs12.h>
#include "asn1_locl.h"
#ifndef OPENSSL_NO_DES
# include <openssl/des.h>
#endif
#ifndef OPENSSL_NO_ENGINE
# include <openssl/engine.h>
#endif
const char PEM_version[] = "PEM" OPENSSL_VERSION_PTEXT;
#define MIN_LENGTH 4
static int load_iv(char **fromp, unsigned char *to, int num);
static int check_pem(const char *nm, const char *name);
int pem_check_suffix(const char *pem_str, const char *suffix);
int PEM_def_callback(char *buf, int num, int w, void *key)
{
#ifdef OPENSSL_NO_FP_API
/*
* We should not ever call the default callback routine from windows.
*/
PEMerr(PEM_F_PEM_DEF_CALLBACK, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return (-1);
#else
int i, j;
const char *prompt;
if (key) {
i = strlen(key);
i = (i > num) ? num : i;
memcpy(buf, key, i);
return (i);
}
prompt = EVP_get_pw_prompt();
if (prompt == NULL)
prompt = "Enter PEM pass phrase:";
for (;;) {
i = EVP_read_pw_string_min(buf, MIN_LENGTH, num, prompt, w);
if (i != 0) {
PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD);
memset(buf, 0, (unsigned int)num);
return (-1);
}
j = strlen(buf);
if (j < MIN_LENGTH) {
fprintf(stderr,
"phrase is too short, needs to be at least %d chars\n",
MIN_LENGTH);
} else
break;
}
return (j);
#endif
}
void PEM_proc_type(char *buf, int type)
{
const char *str;
if (type == PEM_TYPE_ENCRYPTED)
str = "ENCRYPTED";
else if (type == PEM_TYPE_MIC_CLEAR)
str = "MIC-CLEAR";
else if (type == PEM_TYPE_MIC_ONLY)
str = "MIC-ONLY";
else
str = "BAD-TYPE";
BUF_strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE);
BUF_strlcat(buf, str, PEM_BUFSIZE);
BUF_strlcat(buf, "\n", PEM_BUFSIZE);
}
void PEM_dek_info(char *buf, const char *type, int len, char *str)
{
static const unsigned char map[17] = "0123456789ABCDEF";
long i;
int j;
BUF_strlcat(buf, "DEK-Info: ", PEM_BUFSIZE);
BUF_strlcat(buf, type, PEM_BUFSIZE);
BUF_strlcat(buf, ",", PEM_BUFSIZE);
j = strlen(buf);
if (j + (len * 2) + 1 > PEM_BUFSIZE)
return;
for (i = 0; i < len; i++) {
buf[j + i * 2] = map[(str[i] >> 4) & 0x0f];
buf[j + i * 2 + 1] = map[(str[i]) & 0x0f];
}
buf[j + i * 2] = '\n';
buf[j + i * 2 + 1] = '\0';
}
#ifndef OPENSSL_NO_FP_API
void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
pem_password_cb *cb, void *u)
{
BIO *b;
void *ret;
if ((b = BIO_new(BIO_s_file())) == NULL) {
PEMerr(PEM_F_PEM_ASN1_READ, ERR_R_BUF_LIB);
return (0);
}
BIO_set_fp(b, fp, BIO_NOCLOSE);
ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
BIO_free(b);
return (ret);
}
#endif
static int check_pem(const char *nm, const char *name)
{
/* Normal matching nm and name */
if (!strcmp(nm, name))
return 1;
/* Make PEM_STRING_EVP_PKEY match any private key */
if (!strcmp(name, PEM_STRING_EVP_PKEY)) {
int slen;
const EVP_PKEY_ASN1_METHOD *ameth;
if (!strcmp(nm, PEM_STRING_PKCS8))
return 1;
if (!strcmp(nm, PEM_STRING_PKCS8INF))
return 1;
slen = pem_check_suffix(nm, "PRIVATE KEY");
if (slen > 0) {
/*
* NB: ENGINE implementations wont contain a deprecated old
* private key decode function so don't look for them.
*/
ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
if (ameth && ameth->old_priv_decode)
return 1;
}
return 0;
}
if (!strcmp(name, PEM_STRING_PARAMETERS)) {
int slen;
const EVP_PKEY_ASN1_METHOD *ameth;
slen = pem_check_suffix(nm, "PARAMETERS");
if (slen > 0) {
ENGINE *e;
ameth = EVP_PKEY_asn1_find_str(&e, nm, slen);
if (ameth) {
int r;
if (ameth->param_decode)
r = 1;
else
r = 0;
#ifndef OPENSSL_NO_ENGINE
if (e)
ENGINE_finish(e);
#endif
return r;
}
}
return 0;
}
/* Permit older strings */
if (!strcmp(nm, PEM_STRING_X509_OLD) && !strcmp(name, PEM_STRING_X509))
return 1;
if (!strcmp(nm, PEM_STRING_X509_REQ_OLD) &&
!strcmp(name, PEM_STRING_X509_REQ))
return 1;
/* Allow normal certs to be read as trusted certs */
if (!strcmp(nm, PEM_STRING_X509) &&
!strcmp(name, PEM_STRING_X509_TRUSTED))
return 1;
if (!strcmp(nm, PEM_STRING_X509_OLD) &&
!strcmp(name, PEM_STRING_X509_TRUSTED))
return 1;
/* Some CAs use PKCS#7 with CERTIFICATE headers */
if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_PKCS7))
return 1;
if (!strcmp(nm, PEM_STRING_PKCS7_SIGNED) &&
!strcmp(name, PEM_STRING_PKCS7))
return 1;
#ifndef OPENSSL_NO_CMS
if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_CMS))
return 1;
/* Allow CMS to be read from PKCS#7 headers */
if (!strcmp(nm, PEM_STRING_PKCS7) && !strcmp(name, PEM_STRING_CMS))
return 1;
#endif
return 0;
}
int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
const char *name, BIO *bp, pem_password_cb *cb,
void *u)
{
EVP_CIPHER_INFO cipher;
char *nm = NULL, *header = NULL;
unsigned char *data = NULL;
long len;
int ret = 0;
for (;;) {
if (!PEM_read_bio(bp, &nm, &header, &data, &len)) {
if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE)
ERR_add_error_data(2, "Expecting: ", name);
return 0;
}
if (check_pem(nm, name))
break;
OPENSSL_free(nm);
OPENSSL_free(header);
OPENSSL_free(data);
}
if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
goto err;
if (!PEM_do_header(&cipher, data, &len, cb, u))
goto err;
*pdata = data;
*plen = len;
if (pnm)
*pnm = nm;
ret = 1;
err:
if (!ret || !pnm)
OPENSSL_free(nm);
OPENSSL_free(header);
if (!ret)
OPENSSL_free(data);
return ret;
}
#ifndef OPENSSL_NO_FP_API
int 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)
{
BIO *b;
int ret;
if ((b = BIO_new(BIO_s_file())) == NULL) {
PEMerr(PEM_F_PEM_ASN1_WRITE, ERR_R_BUF_LIB);
return (0);
}
BIO_set_fp(b, fp, BIO_NOCLOSE);
ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
BIO_free(b);
return (ret);
}
#endif
int 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)
{
EVP_CIPHER_CTX ctx;
int dsize = 0, i, j, ret = 0;
unsigned char *p, *data = NULL;
const char *objstr = NULL;
char buf[PEM_BUFSIZE];
unsigned char key[EVP_MAX_KEY_LENGTH];
unsigned char iv[EVP_MAX_IV_LENGTH];
if (enc != NULL) {
objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
if (objstr == NULL || EVP_CIPHER_iv_length(enc) == 0) {
PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER);
goto err;
}
}
if ((dsize = i2d(x, NULL)) < 0) {
PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB);
dsize = 0;
goto err;
}
/* dzise + 8 bytes are needed */
/* actually it needs the cipher block size extra... */
data = (unsigned char *)OPENSSL_malloc((unsigned int)dsize + 20);
if (data == NULL) {
PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE);
goto err;
}
p = data;
i = i2d(x, &p);
if (enc != NULL) {
if (kstr == NULL) {
if (callback == NULL)
klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
else
klen = (*callback) (buf, PEM_BUFSIZE, 1, u);
if (klen <= 0) {
PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_READ_KEY);
goto err;
}
#ifdef CHARSET_EBCDIC
/* Convert the pass phrase from EBCDIC */
ebcdic2ascii(buf, buf, klen);
#endif
kstr = (unsigned char *)buf;
}
RAND_add(data, i, 0); /* put in the RSA key. */
OPENSSL_assert(enc->iv_len <= (int)sizeof(iv));
if (RAND_pseudo_bytes(iv, enc->iv_len) < 0) /* Generate a salt */
goto err;
/*
* The 'iv' is used as the iv and as a salt. It is NOT taken from
* the BytesToKey function
*/
if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL))
goto err;
if (kstr == (unsigned char *)buf)
OPENSSL_cleanse(buf, PEM_BUFSIZE);
OPENSSL_assert(strlen(objstr) + 23 + 2 * enc->iv_len + 13 <=
sizeof buf);
buf[0] = '\0';
PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
PEM_dek_info(buf, objstr, enc->iv_len, (char *)iv);
/* k=strlen(buf); */
EVP_CIPHER_CTX_init(&ctx);
ret = 1;
if (!EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv)
|| !EVP_EncryptUpdate(&ctx, data, &j, data, i)
|| !EVP_EncryptFinal_ex(&ctx, &(data[j]), &i))
ret = 0;
EVP_CIPHER_CTX_cleanup(&ctx);
if (ret == 0)
goto err;
i += j;
} else {
ret = 1;
buf[0] = '\0';
}
i = PEM_write_bio(bp, name, buf, data, i);
if (i <= 0)
ret = 0;
err:
OPENSSL_cleanse(key, sizeof(key));
OPENSSL_cleanse(iv, sizeof(iv));
OPENSSL_cleanse((char *)&ctx, sizeof(ctx));
OPENSSL_cleanse(buf, PEM_BUFSIZE);
if (data != NULL) {
OPENSSL_cleanse(data, (unsigned int)dsize);
OPENSSL_free(data);
}
return (ret);
}
int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
pem_password_cb *callback, void *u)
{
int i = 0, j, o, klen;
long len;
EVP_CIPHER_CTX ctx;
unsigned char key[EVP_MAX_KEY_LENGTH];
char buf[PEM_BUFSIZE];
len = *plen;
if (cipher->cipher == NULL)
return (1);
if (callback == NULL)
klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
else
klen = callback(buf, PEM_BUFSIZE, 0, u);
if (klen <= 0) {
PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ);
return (0);
}
#ifdef CHARSET_EBCDIC
/* Convert the pass phrase from EBCDIC */
ebcdic2ascii(buf, buf, klen);
#endif
if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
(unsigned char *)buf, klen, 1, key, NULL))
return 0;
j = (int)len;
EVP_CIPHER_CTX_init(&ctx);
o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
if (o)
o = EVP_DecryptUpdate(&ctx, data, &i, data, j);
if (o)
o = EVP_DecryptFinal_ex(&ctx, &(data[i]), &j);
EVP_CIPHER_CTX_cleanup(&ctx);
OPENSSL_cleanse((char *)buf, sizeof(buf));
OPENSSL_cleanse((char *)key, sizeof(key));
j += i;
if (!o) {
PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT);
return (0);
}
*plen = j;
return (1);
}
int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
{
const EVP_CIPHER *enc = NULL;
char *p, c;
char **header_pp = &header;
cipher->cipher = NULL;
if ((header == NULL) || (*header == '\0') || (*header == '\n'))
return (1);
if (strncmp(header, "Proc-Type: ", 11) != 0) {
PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE);
return (0);
}
header += 11;
if (*header != '4')
return (0);
header++;
if (*header != ',')
return (0);
header++;
if (strncmp(header, "ENCRYPTED", 9) != 0) {
PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED);
return (0);
}
for (; (*header != '\n') && (*header != '\0'); header++) ;
if (*header == '\0') {
PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_SHORT_HEADER);
return (0);
}
header++;
if (strncmp(header, "DEK-Info: ", 10) != 0) {
PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_DEK_INFO);
return (0);
}
header += 10;
p = header;
for (;;) {
c = *header;
#ifndef CHARSET_EBCDIC
if (!(((c >= 'A') && (c <= 'Z')) || (c == '-') ||
((c >= '0') && (c <= '9'))))
break;
#else
if (!(isupper(c) || (c == '-') || isdigit(c)))
break;
#endif
header++;
}
*header = '\0';
cipher->cipher = enc = EVP_get_cipherbyname(p);
*header = c;
header++;
if (enc == NULL) {
PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION);
return (0);
}
if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len))
return (0);
return (1);
}
static int load_iv(char **fromp, unsigned char *to, int num)
{
int v, i;
char *from;
from = *fromp;
for (i = 0; i < num; i++)
to[i] = 0;
num *= 2;
for (i = 0; i < num; i++) {
if ((*from >= '0') && (*from <= '9'))
v = *from - '0';
else if ((*from >= 'A') && (*from <= 'F'))
v = *from - 'A' + 10;
else if ((*from >= 'a') && (*from <= 'f'))
v = *from - 'a' + 10;
else {
PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS);
return (0);
}
from++;
to[i / 2] |= v << (long)((!(i & 1)) * 4);
}
*fromp = from;
return (1);
}
#ifndef OPENSSL_NO_FP_API
int PEM_write(FILE *fp, char *name, char *header, unsigned char *data,
long len)
{
BIO *b;
int ret;
if ((b = BIO_new(BIO_s_file())) == NULL) {
PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB);
return (0);
}
BIO_set_fp(b, fp, BIO_NOCLOSE);
ret = PEM_write_bio(b, name, header, data, len);
BIO_free(b);
return (ret);
}
#endif
int PEM_write_bio(BIO *bp, const char *name, char *header,
unsigned char *data, long len)
{
int nlen, n, i, j, outl;
unsigned char *buf = NULL;
EVP_ENCODE_CTX ctx;
int reason = ERR_R_BUF_LIB;
EVP_EncodeInit(&ctx);
nlen = strlen(name);
if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
(BIO_write(bp, name, nlen) != nlen) ||
(BIO_write(bp, "-----\n", 6) != 6))
goto err;
i = strlen(header);
if (i > 0) {
if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
goto err;
}
buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
if (buf == NULL) {
reason = ERR_R_MALLOC_FAILURE;
goto err;
}
i = j = 0;
while (len > 0) {
n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n);
if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
goto err;
i += outl;
len -= n;
j += n;
}
EVP_EncodeFinal(&ctx, buf, &outl);
if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
goto err;
OPENSSL_cleanse(buf, PEM_BUFSIZE * 8);
OPENSSL_free(buf);
buf = NULL;
if ((BIO_write(bp, "-----END ", 9) != 9) ||
(BIO_write(bp, name, nlen) != nlen) ||
(BIO_write(bp, "-----\n", 6) != 6))
goto err;
return (i + outl);
err:
if (buf) {
OPENSSL_cleanse(buf, PEM_BUFSIZE * 8);
OPENSSL_free(buf);
}
PEMerr(PEM_F_PEM_WRITE_BIO, reason);
return (0);
}
#ifndef OPENSSL_NO_FP_API
int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
long *len)
{
BIO *b;
int ret;
if ((b = BIO_new(BIO_s_file())) == NULL) {
PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB);
return (0);
}
BIO_set_fp(b, fp, BIO_NOCLOSE);
ret = PEM_read_bio(b, name, header, data, len);
BIO_free(b);
return (ret);
}
#endif
int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
long *len)
{
EVP_ENCODE_CTX ctx;
int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
char buf[256];
BUF_MEM *nameB;
BUF_MEM *headerB;
BUF_MEM *dataB, *tmpB;
nameB = BUF_MEM_new();
headerB = BUF_MEM_new();
dataB = BUF_MEM_new();
if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {
BUF_MEM_free(nameB);
BUF_MEM_free(headerB);
BUF_MEM_free(dataB);
PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
return (0);
}
buf[254] = '\0';
for (;;) {
i = BIO_gets(bp, buf, 254);
if (i <= 0) {
PEMerr(PEM_F_PEM_READ_BIO, PEM_R_NO_START_LINE);
goto err;
}
while ((i >= 0) && (buf[i] <= ' '))
i--;
buf[++i] = '\n';
buf[++i] = '\0';
if (strncmp(buf, "-----BEGIN ", 11) == 0) {
i = strlen(&(buf[11]));
if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)
continue;
if (!BUF_MEM_grow(nameB, i + 9)) {
PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
goto err;
}
memcpy(nameB->data, &(buf[11]), i - 6);
nameB->data[i - 6] = '\0';
break;
}
}
hl = 0;
if (!BUF_MEM_grow(headerB, 256)) {
PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
goto err;
}
headerB->data[0] = '\0';
for (;;) {
i = BIO_gets(bp, buf, 254);
if (i <= 0)
break;
while ((i >= 0) && (buf[i] <= ' '))
i--;
buf[++i] = '\n';
buf[++i] = '\0';
if (buf[0] == '\n')
break;
if (!BUF_MEM_grow(headerB, hl + i + 9)) {
PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
goto err;
}
if (strncmp(buf, "-----END ", 9) == 0) {
nohead = 1;
break;
}
memcpy(&(headerB->data[hl]), buf, i);
headerB->data[hl + i] = '\0';
hl += i;
}
bl = 0;
if (!BUF_MEM_grow(dataB, 1024)) {
PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
goto err;
}
dataB->data[0] = '\0';
if (!nohead) {
for (;;) {
i = BIO_gets(bp, buf, 254);
if (i <= 0)
break;
while ((i >= 0) && (buf[i] <= ' '))
i--;
buf[++i] = '\n';
buf[++i] = '\0';
if (i != 65)
end = 1;
if (strncmp(buf, "-----END ", 9) == 0)
break;
if (i > 65)
break;
if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
goto err;
}
memcpy(&(dataB->data[bl]), buf, i);
dataB->data[bl + i] = '\0';
bl += i;
if (end) {
buf[0] = '\0';
i = BIO_gets(bp, buf, 254);
if (i <= 0)
break;
while ((i >= 0) && (buf[i] <= ' '))
i--;
buf[++i] = '\n';
buf[++i] = '\0';
break;
}
}
} else {
tmpB = headerB;
headerB = dataB;
dataB = tmpB;
bl = hl;
}
i = strlen(nameB->data);
if ((strncmp(buf, "-----END ", 9) != 0) ||
(strncmp(nameB->data, &(buf[9]), i) != 0) ||
(strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_END_LINE);
goto err;
}
EVP_DecodeInit(&ctx);
i = EVP_DecodeUpdate(&ctx,
(unsigned char *)dataB->data, &bl,
(unsigned char *)dataB->data, bl);
if (i < 0) {
PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
goto err;
}
i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k);
if (i < 0) {
PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
goto err;
}
bl += k;
if (bl == 0)
goto err;
*name = nameB->data;
*header = headerB->data;
*data = (unsigned char *)dataB->data;
*len = bl;
OPENSSL_free(nameB);
OPENSSL_free(headerB);
OPENSSL_free(dataB);
return (1);
err:
BUF_MEM_free(nameB);
BUF_MEM_free(headerB);
BUF_MEM_free(dataB);
return (0);
}
/*
* Check pem string and return prefix length. If for example the pem_str ==
* "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the
* string "RSA".
*/
int pem_check_suffix(const char *pem_str, const char *suffix)
{
int pem_len = strlen(pem_str);
int suffix_len = strlen(suffix);
const char *p;
if (suffix_len + 1 >= pem_len)
return 0;
p = pem_str + pem_len - suffix_len;
if (strcmp(p, suffix))
return 0;
p--;
if (*p != ' ')
return 0;
return p - pem_str;
}
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