487 lines
15 KiB
C
487 lines
15 KiB
C
/*
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* Copyright (c) 2007, Cameron Rich
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of the axTLS project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* Process PKCS#8/PKCS#12 keys.
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*
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* The decoding of a PKCS#12 key is fairly specific - this code was tested on a
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* key generated with:
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*
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* openssl pkcs12 -export -in axTLS.x509_1024.pem -inkey axTLS.key_1024.pem
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* -keypbe PBE-SHA1-RC4-128 -certpbe PBE-SHA1-RC4-128
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* -name "p12_withoutCA" -out axTLS.withoutCA.p12 -password pass:abcd
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*
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* or with a certificate chain:
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*
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* openssl pkcs12 -export -in axTLS.x509_1024.pem -inkey axTLS.key_1024.pem
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* -certfile axTLS.ca_x509.pem -keypbe PBE-SHA1-RC4-128 -certpbe
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* PBE-SHA1-RC4-128 -name "p12_withCA" -out axTLS.withCA.p12 -password pass:abcd
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*
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* Note that the PBE has to be specified with PBE-SHA1-RC4-128. The
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* private/public keys/certs have to use RSA encryption. Both the integrity
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* and privacy passwords are the same.
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*
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* The PKCS#8 files were generated with something like:
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*
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* PEM format:
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* openssl pkcs8 -in axTLS.key_512.pem -passout pass:abcd -topk8 -v1
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* PBE-SHA1-RC4-128 -out axTLS.encrypted_pem.p8
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*
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* DER format:
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* openssl pkcs8 -in axTLS.key_512.pem -passout pass:abcd -topk8 -outform DER
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* -v1 PBE-SHA1-RC4-128 -out axTLS.encrypted.p8
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "ssl.h"
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/* all commented out if not used */
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#ifdef CONFIG_SSL_USE_PKCS12
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#define BLOCK_SIZE 64
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#define PKCS12_KEY_ID 1
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#define PKCS12_IV_ID 2
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#define PKCS12_MAC_ID 3
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static char *make_uni_pass(const char *password, int *uni_pass_len);
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static int p8_decrypt(const char *uni_pass, int uni_pass_len,
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const uint8_t *salt, int iter,
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uint8_t *priv_key, int priv_key_len, int id);
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static int p8_add_key(SSL_CTX *ssl_ctx, uint8_t *priv_key);
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static int get_pbe_params(uint8_t *buf, int *offset,
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const uint8_t **salt, int *iterations);
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/*
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* Take a raw pkcs8 block and then decrypt it and turn it into a normal key.
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*/
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int pkcs8_decode(SSL_CTX *ssl_ctx, SSLObjLoader *ssl_obj, const char *password)
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{
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uint8_t *buf = ssl_obj->buf;
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int len, offset = 0;
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int iterations;
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int ret = SSL_NOT_OK;
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uint8_t *version = NULL;
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const uint8_t *salt;
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uint8_t *priv_key;
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int uni_pass_len;
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char *uni_pass = make_uni_pass(password, &uni_pass_len);
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if (asn1_next_obj(buf, &offset, ASN1_SEQUENCE) < 0)
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{
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#ifdef CONFIG_SSL_FULL_MODE
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printf("Error: Invalid p8 ASN.1 file\n");
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#endif
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goto error;
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}
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/* unencrypted key? */
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if (asn1_get_int(buf, &offset, &version) > 0 && *version == 0)
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{
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ret = p8_add_key(ssl_ctx, buf);
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goto error;
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}
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if (get_pbe_params(buf, &offset, &salt, &iterations) < 0)
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goto error;
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if ((len = asn1_next_obj(buf, &offset, ASN1_OCTET_STRING)) < 0)
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goto error;
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priv_key = &buf[offset];
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p8_decrypt(uni_pass, uni_pass_len, salt,
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iterations, priv_key, len, PKCS12_KEY_ID);
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ret = p8_add_key(ssl_ctx, priv_key);
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error:
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free(version);
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free(uni_pass);
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return ret;
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}
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/*
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* Take the unencrypted pkcs8 and turn it into a private key
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*/
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static int p8_add_key(SSL_CTX *ssl_ctx, uint8_t *priv_key)
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{
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uint8_t *buf = priv_key;
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int len, offset = 0;
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int ret = SSL_NOT_OK;
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/* Skip the preamble and go straight to the private key.
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We only support rsaEncryption (1.2.840.113549.1.1.1) */
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if (asn1_next_obj(buf, &offset, ASN1_SEQUENCE) < 0 ||
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asn1_skip_obj(buf, &offset, ASN1_INTEGER) < 0 ||
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asn1_skip_obj(buf, &offset, ASN1_SEQUENCE) < 0 ||
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(len = asn1_next_obj(buf, &offset, ASN1_OCTET_STRING)) < 0)
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goto error;
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ret = asn1_get_private_key(&buf[offset], len, &ssl_ctx->rsa_ctx);
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error:
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return ret;
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}
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/*
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* Create the unicode password
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*/
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static char *make_uni_pass(const char *password, int *uni_pass_len)
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{
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int pass_len = 0, i;
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char *uni_pass;
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if (password == NULL)
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{
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password = "";
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}
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uni_pass = (char *)malloc((strlen(password)+1)*2);
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/* modify the password into a unicode version */
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for (i = 0; i < (int)strlen(password); i++)
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{
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uni_pass[pass_len++] = 0;
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uni_pass[pass_len++] = password[i];
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}
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uni_pass[pass_len++] = 0; /* null terminate */
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uni_pass[pass_len++] = 0;
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*uni_pass_len = pass_len;
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return uni_pass;
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}
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/*
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* Decrypt a pkcs8 block.
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*/
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static int p8_decrypt(const char *uni_pass, int uni_pass_len,
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const uint8_t *salt, int iter,
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uint8_t *priv_key, int priv_key_len, int id)
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{
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uint8_t p[BLOCK_SIZE*2];
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uint8_t d[BLOCK_SIZE];
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uint8_t Ai[SHA1_SIZE];
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SHA1_CTX sha_ctx;
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RC4_CTX rc4_ctx;
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int i;
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for (i = 0; i < BLOCK_SIZE; i++)
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{
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p[i] = salt[i % SALT_SIZE];
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p[BLOCK_SIZE+i] = uni_pass[i % uni_pass_len];
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d[i] = id;
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}
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/* get the key - no IV since we are using RC4 */
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SHA1_Init(&sha_ctx);
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SHA1_Update(&sha_ctx, d, sizeof(d));
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SHA1_Update(&sha_ctx, p, sizeof(p));
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SHA1_Final(Ai, &sha_ctx);
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for (i = 1; i < iter; i++)
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{
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SHA1_Init(&sha_ctx);
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SHA1_Update(&sha_ctx, Ai, SHA1_SIZE);
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SHA1_Final(Ai, &sha_ctx);
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}
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/* do the decryption */
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if (id == PKCS12_KEY_ID)
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{
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RC4_setup(&rc4_ctx, Ai, 16);
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RC4_crypt(&rc4_ctx, priv_key, priv_key, priv_key_len);
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}
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else /* MAC */
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memcpy(priv_key, Ai, SHA1_SIZE);
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return 0;
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}
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/*
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* Take a raw pkcs12 block and the decrypt it and turn it into a certificate(s)
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* and keys.
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*/
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int pkcs12_decode(SSL_CTX *ssl_ctx, SSLObjLoader *ssl_obj, const char *password)
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{
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uint8_t *buf = ssl_obj->buf;
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int all_ok = 0, len, iterations, auth_safes_start,
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auth_safes_end, auth_safes_len, key_offset, offset = 0;
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int all_certs = 0;
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uint8_t *version = NULL, *auth_safes = NULL, *cert, *orig_mac;
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uint8_t key[SHA1_SIZE];
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uint8_t mac[SHA1_SIZE];
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const uint8_t *salt;
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int uni_pass_len, ret;
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int error_code = SSL_ERROR_NOT_SUPPORTED;
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char *uni_pass = make_uni_pass(password, &uni_pass_len);
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static const uint8_t pkcs_data[] = /* pkc7 data */
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{ 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x07, 0x01 };
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static const uint8_t pkcs_encrypted[] = /* pkc7 encrypted */
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{ 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x07, 0x06 };
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static const uint8_t pkcs8_key_bag[] = /* 1.2.840.113549.1.12.10.1.2 */
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{ 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x0c, 0x0a, 0x01, 0x02 };
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if (asn1_next_obj(buf, &offset, ASN1_SEQUENCE) < 0)
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{
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#ifdef CONFIG_SSL_FULL_MODE
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printf("Error: Invalid p12 ASN.1 file\n");
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#endif
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goto error;
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}
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if (asn1_get_int(buf, &offset, &version) < 0 || *version != 3)
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{
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error_code = SSL_ERROR_INVALID_VERSION;
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goto error;
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}
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/* remove all the boring pcks7 bits */
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if (asn1_next_obj(buf, &offset, ASN1_SEQUENCE) < 0 ||
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(len = asn1_next_obj(buf, &offset, ASN1_OID)) < 0 ||
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len != sizeof(pkcs_data) ||
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memcmp(&buf[offset], pkcs_data, sizeof(pkcs_data)))
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goto error;
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offset += len;
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if (asn1_next_obj(buf, &offset, ASN1_EXPLICIT_TAG) < 0 ||
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asn1_next_obj(buf, &offset, ASN1_OCTET_STRING) < 0)
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goto error;
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/* work out the MAC start/end points (done on AuthSafes) */
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auth_safes_start = offset;
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auth_safes_end = offset;
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if (asn1_skip_obj(buf, &auth_safes_end, ASN1_SEQUENCE) < 0)
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goto error;
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auth_safes_len = auth_safes_end - auth_safes_start;
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auth_safes = malloc(auth_safes_len);
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memcpy(auth_safes, &buf[auth_safes_start], auth_safes_len);
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if (asn1_next_obj(buf, &offset, ASN1_SEQUENCE) < 0 ||
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asn1_next_obj(buf, &offset, ASN1_SEQUENCE) < 0 ||
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(len = asn1_next_obj(buf, &offset, ASN1_OID)) < 0 ||
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(len != sizeof(pkcs_encrypted) ||
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memcmp(&buf[offset], pkcs_encrypted, sizeof(pkcs_encrypted))))
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goto error;
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offset += len;
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if (asn1_next_obj(buf, &offset, ASN1_EXPLICIT_TAG) < 0 ||
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asn1_next_obj(buf, &offset, ASN1_SEQUENCE) < 0 ||
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asn1_skip_obj(buf, &offset, ASN1_INTEGER) < 0 ||
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asn1_next_obj(buf, &offset, ASN1_SEQUENCE) < 0 ||
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(len = asn1_next_obj(buf, &offset, ASN1_OID)) < 0 ||
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len != sizeof(pkcs_data) ||
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memcmp(&buf[offset], pkcs_data, sizeof(pkcs_data)))
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goto error;
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offset += len;
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/* work out the salt for the certificate */
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if (get_pbe_params(buf, &offset, &salt, &iterations) < 0 ||
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(len = asn1_next_obj(buf, &offset, ASN1_IMPLICIT_TAG)) < 0)
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goto error;
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/* decrypt the certificate */
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cert = &buf[offset];
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if ((ret = p8_decrypt(uni_pass, uni_pass_len, salt, iterations, cert,
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len, PKCS12_KEY_ID)) < 0)
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goto error;
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offset += len;
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/* load the certificate */
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key_offset = 0;
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all_certs = asn1_next_obj(cert, &key_offset, ASN1_SEQUENCE);
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/* keep going until all certs are loaded */
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while (key_offset < all_certs)
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{
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int cert_offset = key_offset;
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if (asn1_skip_obj(cert, &cert_offset, ASN1_SEQUENCE) < 0 ||
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asn1_next_obj(cert, &key_offset, ASN1_SEQUENCE) < 0 ||
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asn1_skip_obj(cert, &key_offset, ASN1_OID) < 0 ||
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asn1_next_obj(cert, &key_offset, ASN1_EXPLICIT_TAG) < 0 ||
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asn1_next_obj(cert, &key_offset, ASN1_SEQUENCE) < 0 ||
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asn1_skip_obj(cert, &key_offset, ASN1_OID) < 0 ||
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asn1_next_obj(cert, &key_offset, ASN1_EXPLICIT_TAG) < 0 ||
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(len = asn1_next_obj(cert, &key_offset, ASN1_OCTET_STRING)) < 0)
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goto error;
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if ((ret = add_cert(ssl_ctx, &cert[key_offset], len)) < 0)
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goto error;
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key_offset = cert_offset;
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}
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if (asn1_next_obj(buf, &offset, ASN1_SEQUENCE) < 0 ||
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(len = asn1_next_obj(buf, &offset, ASN1_OID)) < 0 ||
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len != sizeof(pkcs_data) ||
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memcmp(&buf[offset], pkcs_data, sizeof(pkcs_data)))
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goto error;
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offset += len;
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if (asn1_next_obj(buf, &offset, ASN1_EXPLICIT_TAG) < 0 ||
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asn1_next_obj(buf, &offset, ASN1_OCTET_STRING) < 0 ||
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asn1_next_obj(buf, &offset, ASN1_SEQUENCE) < 0 ||
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asn1_next_obj(buf, &offset, ASN1_SEQUENCE) < 0 ||
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(len = asn1_next_obj(buf, &offset, ASN1_OID)) < 0 ||
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(len != sizeof(pkcs8_key_bag)) ||
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memcmp(&buf[offset], pkcs8_key_bag, sizeof(pkcs8_key_bag)))
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goto error;
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offset += len;
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/* work out the salt for the private key */
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if (asn1_next_obj(buf, &offset, ASN1_EXPLICIT_TAG) < 0 ||
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asn1_next_obj(buf, &offset, ASN1_SEQUENCE) < 0 ||
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get_pbe_params(buf, &offset, &salt, &iterations) < 0 ||
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(len = asn1_next_obj(buf, &offset, ASN1_OCTET_STRING)) < 0)
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goto error;
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/* decrypt the private key */
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cert = &buf[offset];
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if ((ret = p8_decrypt(uni_pass, uni_pass_len, salt, iterations, cert,
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len, PKCS12_KEY_ID)) < 0)
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goto error;
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offset += len;
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/* load the private key */
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if ((ret = p8_add_key(ssl_ctx, cert)) < 0)
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goto error;
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/* miss out on friendly name, local key id etc */
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if (asn1_skip_obj(buf, &offset, ASN1_SET) < 0)
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goto error;
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/* work out the MAC */
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if (asn1_next_obj(buf, &offset, ASN1_SEQUENCE) < 0 ||
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asn1_next_obj(buf, &offset, ASN1_SEQUENCE) < 0 ||
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asn1_skip_obj(buf, &offset, ASN1_SEQUENCE) < 0 ||
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(len = asn1_next_obj(buf, &offset, ASN1_OCTET_STRING)) < 0 ||
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len != SHA1_SIZE)
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goto error;
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orig_mac = &buf[offset];
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offset += len;
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/* get the salt */
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if ((len = asn1_next_obj(buf, &offset, ASN1_OCTET_STRING)) < 0 || len != 8)
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goto error;
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salt = &buf[offset];
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/* work out what the mac should be */
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if ((ret = p8_decrypt(uni_pass, uni_pass_len, salt, iterations,
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key, SHA1_SIZE, PKCS12_MAC_ID)) < 0)
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goto error;
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hmac_sha1(auth_safes, auth_safes_len, key, SHA1_SIZE, mac);
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if (memcmp(mac, orig_mac, SHA1_SIZE))
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{
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error_code = SSL_ERROR_INVALID_HMAC;
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goto error;
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}
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all_ok = 1;
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error:
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free(version);
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free(uni_pass);
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free(auth_safes);
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return all_ok ? SSL_OK : error_code;
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}
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/*
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* Retrieve the salt/iteration details from a PBE block.
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*/
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static int get_pbe_params(uint8_t *buf, int *offset,
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const uint8_t **salt, int *iterations)
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{
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static const uint8_t pbeSH1RC4[] = /* pbeWithSHAAnd128BitRC4 */
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{ 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x0c, 0x01, 0x01 };
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int i, len;
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uint8_t *iter = NULL;
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int error_code = SSL_ERROR_NOT_SUPPORTED;
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/* Get the PBE type */
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if (asn1_next_obj(buf, offset, ASN1_SEQUENCE) < 0 ||
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(len = asn1_next_obj(buf, offset, ASN1_OID)) < 0)
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goto error;
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|
/* we expect pbeWithSHAAnd128BitRC4 (1.2.840.113549.1.12.1.1)
|
|
which is the only algorithm we support */
|
|
if (len != sizeof(pbeSH1RC4) ||
|
|
memcmp(&buf[*offset], pbeSH1RC4, sizeof(pbeSH1RC4)))
|
|
{
|
|
#ifdef CONFIG_SSL_FULL_MODE
|
|
printf("Error: pkcs8/pkcs12 must use \"PBE-SHA1-RC4-128\"\n");
|
|
#endif
|
|
goto error;
|
|
}
|
|
|
|
*offset += len;
|
|
|
|
if (asn1_next_obj(buf, offset, ASN1_SEQUENCE) < 0 ||
|
|
(len = asn1_next_obj(buf, offset, ASN1_OCTET_STRING)) < 0 ||
|
|
len != 8)
|
|
goto error;
|
|
|
|
*salt = &buf[*offset];
|
|
*offset += len;
|
|
|
|
if ((len = asn1_get_int(buf, offset, &iter)) < 0)
|
|
goto error;
|
|
|
|
*iterations = 0;
|
|
for (i = 0; i < len; i++)
|
|
{
|
|
(*iterations) <<= 8;
|
|
(*iterations) += iter[i];
|
|
}
|
|
|
|
free(iter);
|
|
error_code = SSL_OK; /* got here - we are ok */
|
|
|
|
error:
|
|
return error_code;
|
|
}
|
|
|
|
#endif
|