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proxmark3/common/mbedtls/pem.c
Philippe Teuwen 961d929f4d changing {} style to match majority of previous style
2019-03-10 11:20:22 +01:00

467 lines
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/*
* Privacy Enhanced Mail (PEM) decoding
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: GPL-2.0
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if defined(MBEDTLS_PEM_PARSE_C) || defined(MBEDTLS_PEM_WRITE_C)
#include "mbedtls/pem.h"
#include "mbedtls/base64.h"
#include "mbedtls/des.h"
#include "mbedtls/aes.h"
#include "mbedtls/md5.h"
#include "mbedtls/cipher.h"
#include "mbedtls/platform_util.h"
#include <string.h>
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdlib.h>
#define mbedtls_calloc calloc
#define mbedtls_free free
#endif
#if defined(MBEDTLS_PEM_PARSE_C)
void mbedtls_pem_init(mbedtls_pem_context *ctx) {
memset(ctx, 0, sizeof(mbedtls_pem_context));
}
#if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
/*
* Read a 16-byte hex string and convert it to binary
*/
static int pem_get_iv(const unsigned char *s, unsigned char *iv,
size_t iv_len) {
size_t i, j, k;
memset(iv, 0, iv_len);
for (i = 0; i < iv_len * 2; i++, s++) {
if (*s >= '0' && *s <= '9') j = *s - '0';
else if (*s >= 'A' && *s <= 'F') j = *s - '7';
else if (*s >= 'a' && *s <= 'f') j = *s - 'W';
else
return (MBEDTLS_ERR_PEM_INVALID_ENC_IV);
k = ((i & 1) != 0) ? j : j << 4;
iv[i >> 1] = (unsigned char)(iv[i >> 1] | k);
}
return (0);
}
static int pem_pbkdf1(unsigned char *key, size_t keylen,
unsigned char *iv,
const unsigned char *pwd, size_t pwdlen) {
mbedtls_md5_context md5_ctx;
unsigned char md5sum[16];
size_t use_len;
int ret;
mbedtls_md5_init(&md5_ctx);
/*
* key[ 0..15] = MD5(pwd || IV)
*/
if ((ret = mbedtls_md5_starts_ret(&md5_ctx)) != 0)
goto exit;
if ((ret = mbedtls_md5_update_ret(&md5_ctx, pwd, pwdlen)) != 0)
goto exit;
if ((ret = mbedtls_md5_update_ret(&md5_ctx, iv, 8)) != 0)
goto exit;
if ((ret = mbedtls_md5_finish_ret(&md5_ctx, md5sum)) != 0)
goto exit;
if (keylen <= 16) {
memcpy(key, md5sum, keylen);
goto exit;
}
memcpy(key, md5sum, 16);
/*
* key[16..23] = MD5(key[ 0..15] || pwd || IV])
*/
if ((ret = mbedtls_md5_starts_ret(&md5_ctx)) != 0)
goto exit;
if ((ret = mbedtls_md5_update_ret(&md5_ctx, md5sum, 16)) != 0)
goto exit;
if ((ret = mbedtls_md5_update_ret(&md5_ctx, pwd, pwdlen)) != 0)
goto exit;
if ((ret = mbedtls_md5_update_ret(&md5_ctx, iv, 8)) != 0)
goto exit;
if ((ret = mbedtls_md5_finish_ret(&md5_ctx, md5sum)) != 0)
goto exit;
use_len = 16;
if (keylen < 32)
use_len = keylen - 16;
memcpy(key + 16, md5sum, use_len);
exit:
mbedtls_md5_free(&md5_ctx);
mbedtls_platform_zeroize(md5sum, 16);
return (ret);
}
#if defined(MBEDTLS_DES_C)
/*
* Decrypt with DES-CBC, using PBKDF1 for key derivation
*/
static int pem_des_decrypt(unsigned char des_iv[8],
unsigned char *buf, size_t buflen,
const unsigned char *pwd, size_t pwdlen) {
mbedtls_des_context des_ctx;
unsigned char des_key[8];
int ret;
mbedtls_des_init(&des_ctx);
if ((ret = pem_pbkdf1(des_key, 8, des_iv, pwd, pwdlen)) != 0)
goto exit;
if ((ret = mbedtls_des_setkey_dec(&des_ctx, des_key)) != 0)
goto exit;
ret = mbedtls_des_crypt_cbc(&des_ctx, MBEDTLS_DES_DECRYPT, buflen,
des_iv, buf, buf);
exit:
mbedtls_des_free(&des_ctx);
mbedtls_platform_zeroize(des_key, 8);
return (ret);
}
/*
* Decrypt with 3DES-CBC, using PBKDF1 for key derivation
*/
static int pem_des3_decrypt(unsigned char des3_iv[8],
unsigned char *buf, size_t buflen,
const unsigned char *pwd, size_t pwdlen) {
mbedtls_des3_context des3_ctx;
unsigned char des3_key[24];
int ret;
mbedtls_des3_init(&des3_ctx);
if ((ret = pem_pbkdf1(des3_key, 24, des3_iv, pwd, pwdlen)) != 0)
goto exit;
if ((ret = mbedtls_des3_set3key_dec(&des3_ctx, des3_key)) != 0)
goto exit;
ret = mbedtls_des3_crypt_cbc(&des3_ctx, MBEDTLS_DES_DECRYPT, buflen,
des3_iv, buf, buf);
exit:
mbedtls_des3_free(&des3_ctx);
mbedtls_platform_zeroize(des3_key, 24);
return (ret);
}
#endif /* MBEDTLS_DES_C */
#if defined(MBEDTLS_AES_C)
/*
* Decrypt with AES-XXX-CBC, using PBKDF1 for key derivation
*/
static int pem_aes_decrypt(unsigned char aes_iv[16], unsigned int keylen,
unsigned char *buf, size_t buflen,
const unsigned char *pwd, size_t pwdlen) {
mbedtls_aes_context aes_ctx;
unsigned char aes_key[32];
int ret;
mbedtls_aes_init(&aes_ctx);
if ((ret = pem_pbkdf1(aes_key, keylen, aes_iv, pwd, pwdlen)) != 0)
goto exit;
if ((ret = mbedtls_aes_setkey_dec(&aes_ctx, aes_key, keylen * 8)) != 0)
goto exit;
ret = mbedtls_aes_crypt_cbc(&aes_ctx, MBEDTLS_AES_DECRYPT, buflen,
aes_iv, buf, buf);
exit:
mbedtls_aes_free(&aes_ctx);
mbedtls_platform_zeroize(aes_key, keylen);
return (ret);
}
#endif /* MBEDTLS_AES_C */
#endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
int mbedtls_pem_read_buffer(mbedtls_pem_context *ctx, const char *header, const char *footer,
const unsigned char *data, const unsigned char *pwd,
size_t pwdlen, size_t *use_len) {
int ret, enc;
size_t len;
unsigned char *buf;
const unsigned char *s1, *s2, *end;
#if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
unsigned char pem_iv[16];
mbedtls_cipher_type_t enc_alg = MBEDTLS_CIPHER_NONE;
#else
((void) pwd);
((void) pwdlen);
#endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
if (ctx == NULL)
return (MBEDTLS_ERR_PEM_BAD_INPUT_DATA);
s1 = (unsigned char *) strstr((const char *) data, header);
if (s1 == NULL)
return (MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT);
s2 = (unsigned char *) strstr((const char *) data, footer);
if (s2 == NULL || s2 <= s1)
return (MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT);
s1 += strlen(header);
if (*s1 == ' ') s1++;
if (*s1 == '\r') s1++;
if (*s1 == '\n') s1++;
else return (MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT);
end = s2;
end += strlen(footer);
if (*end == ' ') end++;
if (*end == '\r') end++;
if (*end == '\n') end++;
*use_len = end - data;
enc = 0;
if (s2 - s1 >= 22 && memcmp(s1, "Proc-Type: 4,ENCRYPTED", 22) == 0) {
#if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
enc++;
s1 += 22;
if (*s1 == '\r') s1++;
if (*s1 == '\n') s1++;
else return (MBEDTLS_ERR_PEM_INVALID_DATA);
#if defined(MBEDTLS_DES_C)
if (s2 - s1 >= 23 && memcmp(s1, "DEK-Info: DES-EDE3-CBC,", 23) == 0) {
enc_alg = MBEDTLS_CIPHER_DES_EDE3_CBC;
s1 += 23;
if (s2 - s1 < 16 || pem_get_iv(s1, pem_iv, 8) != 0)
return (MBEDTLS_ERR_PEM_INVALID_ENC_IV);
s1 += 16;
} else if (s2 - s1 >= 18 && memcmp(s1, "DEK-Info: DES-CBC,", 18) == 0) {
enc_alg = MBEDTLS_CIPHER_DES_CBC;
s1 += 18;
if (s2 - s1 < 16 || pem_get_iv(s1, pem_iv, 8) != 0)
return (MBEDTLS_ERR_PEM_INVALID_ENC_IV);
s1 += 16;
}
#endif /* MBEDTLS_DES_C */
#if defined(MBEDTLS_AES_C)
if (s2 - s1 >= 14 && memcmp(s1, "DEK-Info: AES-", 14) == 0) {
if (s2 - s1 < 22)
return (MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG);
else if (memcmp(s1, "DEK-Info: AES-128-CBC,", 22) == 0)
enc_alg = MBEDTLS_CIPHER_AES_128_CBC;
else if (memcmp(s1, "DEK-Info: AES-192-CBC,", 22) == 0)
enc_alg = MBEDTLS_CIPHER_AES_192_CBC;
else if (memcmp(s1, "DEK-Info: AES-256-CBC,", 22) == 0)
enc_alg = MBEDTLS_CIPHER_AES_256_CBC;
else
return (MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG);
s1 += 22;
if (s2 - s1 < 32 || pem_get_iv(s1, pem_iv, 16) != 0)
return (MBEDTLS_ERR_PEM_INVALID_ENC_IV);
s1 += 32;
}
#endif /* MBEDTLS_AES_C */
if (enc_alg == MBEDTLS_CIPHER_NONE)
return (MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG);
if (*s1 == '\r') s1++;
if (*s1 == '\n') s1++;
else return (MBEDTLS_ERR_PEM_INVALID_DATA);
#else
return (MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE);
#endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
}
if (s1 >= s2)
return (MBEDTLS_ERR_PEM_INVALID_DATA);
ret = mbedtls_base64_decode(NULL, 0, &len, s1, s2 - s1);
if (ret == MBEDTLS_ERR_BASE64_INVALID_CHARACTER)
return (MBEDTLS_ERR_PEM_INVALID_DATA + ret);
if ((buf = mbedtls_calloc(1, len)) == NULL)
return (MBEDTLS_ERR_PEM_ALLOC_FAILED);
if ((ret = mbedtls_base64_decode(buf, len, &len, s1, s2 - s1)) != 0) {
mbedtls_platform_zeroize(buf, len);
mbedtls_free(buf);
return (MBEDTLS_ERR_PEM_INVALID_DATA + ret);
}
if (enc != 0) {
#if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
if (pwd == NULL) {
mbedtls_platform_zeroize(buf, len);
mbedtls_free(buf);
return (MBEDTLS_ERR_PEM_PASSWORD_REQUIRED);
}
ret = 0;
#if defined(MBEDTLS_DES_C)
if (enc_alg == MBEDTLS_CIPHER_DES_EDE3_CBC)
ret = pem_des3_decrypt(pem_iv, buf, len, pwd, pwdlen);
else if (enc_alg == MBEDTLS_CIPHER_DES_CBC)
ret = pem_des_decrypt(pem_iv, buf, len, pwd, pwdlen);
#endif /* MBEDTLS_DES_C */
#if defined(MBEDTLS_AES_C)
if (enc_alg == MBEDTLS_CIPHER_AES_128_CBC)
ret = pem_aes_decrypt(pem_iv, 16, buf, len, pwd, pwdlen);
else if (enc_alg == MBEDTLS_CIPHER_AES_192_CBC)
ret = pem_aes_decrypt(pem_iv, 24, buf, len, pwd, pwdlen);
else if (enc_alg == MBEDTLS_CIPHER_AES_256_CBC)
ret = pem_aes_decrypt(pem_iv, 32, buf, len, pwd, pwdlen);
#endif /* MBEDTLS_AES_C */
if (ret != 0) {
mbedtls_free(buf);
return (ret);
}
/*
* The result will be ASN.1 starting with a SEQUENCE tag, with 1 to 3
* length bytes (allow 4 to be sure) in all known use cases.
*
* Use that as a heuristic to try to detect password mismatches.
*/
if (len <= 2 || buf[0] != 0x30 || buf[1] > 0x83) {
mbedtls_platform_zeroize(buf, len);
mbedtls_free(buf);
return (MBEDTLS_ERR_PEM_PASSWORD_MISMATCH);
}
#else
mbedtls_platform_zeroize(buf, len);
mbedtls_free(buf);
return (MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE);
#endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
}
ctx->buf = buf;
ctx->buflen = len;
return (0);
}
void mbedtls_pem_free(mbedtls_pem_context *ctx) {
if (ctx->buf != NULL)
mbedtls_platform_zeroize(ctx->buf, ctx->buflen);
mbedtls_free(ctx->buf);
mbedtls_free(ctx->info);
mbedtls_platform_zeroize(ctx, sizeof(mbedtls_pem_context));
}
#endif /* MBEDTLS_PEM_PARSE_C */
#if defined(MBEDTLS_PEM_WRITE_C)
int mbedtls_pem_write_buffer(const char *header, const char *footer,
const unsigned char *der_data, size_t der_len,
unsigned char *buf, size_t buf_len, size_t *olen) {
int ret;
unsigned char *encode_buf = NULL, *c, *p = buf;
size_t len = 0, use_len, add_len = 0;
mbedtls_base64_encode(NULL, 0, &use_len, der_data, der_len);
add_len = strlen(header) + strlen(footer) + (use_len / 64) + 1;
if (use_len + add_len > buf_len) {
*olen = use_len + add_len;
return (MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL);
}
if (use_len != 0 &&
((encode_buf = mbedtls_calloc(1, use_len)) == NULL))
return (MBEDTLS_ERR_PEM_ALLOC_FAILED);
if ((ret = mbedtls_base64_encode(encode_buf, use_len, &use_len, der_data,
der_len)) != 0) {
mbedtls_free(encode_buf);
return (ret);
}
memcpy(p, header, strlen(header));
p += strlen(header);
c = encode_buf;
while (use_len) {
len = (use_len > 64) ? 64 : use_len;
memcpy(p, c, len);
use_len -= len;
p += len;
c += len;
*p++ = '\n';
}
memcpy(p, footer, strlen(footer));
p += strlen(footer);
*p++ = '\0';
*olen = p - buf;
mbedtls_free(encode_buf);
return (0);
}
#endif /* MBEDTLS_PEM_WRITE_C */
#endif /* MBEDTLS_PEM_PARSE_C || MBEDTLS_PEM_WRITE_C */
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