mirror of
https://github.com/Detanup01/gbe_fork.git
synced 2024-12-31 04:44:16 +08:00
521 lines
14 KiB
C
521 lines
14 KiB
C
/*
|
|
* Privacy Enhanced Mail (PEM) decoding
|
|
*
|
|
* Copyright The Mbed TLS Contributors
|
|
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
|
|
*/
|
|
|
|
#include "common.h"
|
|
|
|
#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/md.h"
|
|
#include "mbedtls/cipher.h"
|
|
#include "mbedtls/platform_util.h"
|
|
#include "mbedtls/error.h"
|
|
|
|
#include <string.h>
|
|
|
|
#include "mbedtls/platform.h"
|
|
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
#include "psa/crypto.h"
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_MD_CAN_MD5) && \
|
|
defined(MBEDTLS_CIPHER_MODE_CBC) && \
|
|
(defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C))
|
|
#define PEM_RFC1421
|
|
#endif /* MBEDTLS_MD_CAN_MD5 &&
|
|
MBEDTLS_CIPHER_MODE_CBC &&
|
|
( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
|
|
|
|
#if defined(MBEDTLS_PEM_PARSE_C)
|
|
void mbedtls_pem_init(mbedtls_pem_context *ctx)
|
|
{
|
|
memset(ctx, 0, sizeof(mbedtls_pem_context));
|
|
}
|
|
|
|
#if defined(PEM_RFC1421)
|
|
/*
|
|
* 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_md_context_t md5_ctx;
|
|
const mbedtls_md_info_t *md5_info;
|
|
unsigned char md5sum[16];
|
|
size_t use_len;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
mbedtls_md_init(&md5_ctx);
|
|
|
|
/* Prepare the context. (setup() errors gracefully on NULL info.) */
|
|
md5_info = mbedtls_md_info_from_type(MBEDTLS_MD_MD5);
|
|
if ((ret = mbedtls_md_setup(&md5_ctx, md5_info, 0)) != 0) {
|
|
goto exit;
|
|
}
|
|
|
|
/*
|
|
* key[ 0..15] = MD5(pwd || IV)
|
|
*/
|
|
if ((ret = mbedtls_md_starts(&md5_ctx)) != 0) {
|
|
goto exit;
|
|
}
|
|
if ((ret = mbedtls_md_update(&md5_ctx, pwd, pwdlen)) != 0) {
|
|
goto exit;
|
|
}
|
|
if ((ret = mbedtls_md_update(&md5_ctx, iv, 8)) != 0) {
|
|
goto exit;
|
|
}
|
|
if ((ret = mbedtls_md_finish(&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_md_starts(&md5_ctx)) != 0) {
|
|
goto exit;
|
|
}
|
|
if ((ret = mbedtls_md_update(&md5_ctx, md5sum, 16)) != 0) {
|
|
goto exit;
|
|
}
|
|
if ((ret = mbedtls_md_update(&md5_ctx, pwd, pwdlen)) != 0) {
|
|
goto exit;
|
|
}
|
|
if ((ret = mbedtls_md_update(&md5_ctx, iv, 8)) != 0) {
|
|
goto exit;
|
|
}
|
|
if ((ret = mbedtls_md_finish(&md5_ctx, md5sum)) != 0) {
|
|
goto exit;
|
|
}
|
|
|
|
use_len = 16;
|
|
if (keylen < 32) {
|
|
use_len = keylen - 16;
|
|
}
|
|
|
|
memcpy(key + 16, md5sum, use_len);
|
|
|
|
exit:
|
|
mbedtls_md_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_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
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_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
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_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
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 /* PEM_RFC1421 */
|
|
|
|
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(PEM_RFC1421)
|
|
unsigned char pem_iv[16];
|
|
mbedtls_cipher_type_t enc_alg = MBEDTLS_CIPHER_NONE;
|
|
#else
|
|
((void) pwd);
|
|
((void) pwdlen);
|
|
#endif /* PEM_RFC1421 */
|
|
|
|
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(PEM_RFC1421)
|
|
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 /* PEM_RFC1421 */
|
|
}
|
|
|
|
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_ERROR_ADD(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_zeroize_and_free(buf, len);
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PEM_INVALID_DATA, ret);
|
|
}
|
|
|
|
if (enc != 0) {
|
|
#if defined(PEM_RFC1421)
|
|
if (pwd == NULL) {
|
|
mbedtls_zeroize_and_free(buf, len);
|
|
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_zeroize_and_free(buf, len);
|
|
return MBEDTLS_ERR_PEM_PASSWORD_MISMATCH;
|
|
}
|
|
#else
|
|
mbedtls_zeroize_and_free(buf, len);
|
|
return MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE;
|
|
#endif /* PEM_RFC1421 */
|
|
}
|
|
|
|
ctx->buf = buf;
|
|
ctx->buflen = len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void mbedtls_pem_free(mbedtls_pem_context *ctx)
|
|
{
|
|
if (ctx->buf != NULL) {
|
|
mbedtls_zeroize_and_free(ctx->buf, ctx->buflen);
|
|
}
|
|
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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
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 > 2) ? (use_len - 2) : 0) / 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;
|
|
|
|
/* Clean any remaining data previously written to the buffer */
|
|
memset(buf + *olen, 0, buf_len - *olen);
|
|
|
|
mbedtls_free(encode_buf);
|
|
return 0;
|
|
}
|
|
#endif /* MBEDTLS_PEM_WRITE_C */
|
|
#endif /* MBEDTLS_PEM_PARSE_C || MBEDTLS_PEM_WRITE_C */
|