514 lines
16 KiB
C
514 lines
16 KiB
C
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project 1999.
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*/
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/* ====================================================================
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* Copyright (c) 1999 The OpenSSL Project. 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
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com). */
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#include <openssl/pkcs8.h>
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#include <assert.h>
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#include <limits.h>
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#include <string.h>
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#include <openssl/bytestring.h>
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#include <openssl/cipher.h>
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#include <openssl/digest.h>
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#include <openssl/err.h>
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#include <openssl/mem.h>
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#include <openssl/nid.h>
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#include <openssl/rand.h>
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#include "internal.h"
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#include "../internal.h"
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static int ascii_to_ucs2(const char *ascii, size_t ascii_len,
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uint8_t **out, size_t *out_len) {
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size_t ulen = ascii_len * 2 + 2;
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if (ascii_len * 2 < ascii_len || ulen < ascii_len * 2) {
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return 0;
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}
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uint8_t *unitmp = OPENSSL_malloc(ulen);
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if (unitmp == NULL) {
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OPENSSL_PUT_ERROR(PKCS8, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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for (size_t i = 0; i < ulen - 2; i += 2) {
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unitmp[i] = 0;
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unitmp[i + 1] = ascii[i >> 1];
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}
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// Terminate the result with a UCS-2 NUL.
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unitmp[ulen - 2] = 0;
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unitmp[ulen - 1] = 0;
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*out_len = ulen;
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*out = unitmp;
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return 1;
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}
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int pkcs12_key_gen(const char *pass, size_t pass_len, const uint8_t *salt,
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size_t salt_len, uint8_t id, unsigned iterations,
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size_t out_len, uint8_t *out, const EVP_MD *md) {
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// See https://tools.ietf.org/html/rfc7292#appendix-B. Quoted parts of the
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// specification have errata applied and other typos fixed.
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if (iterations < 1) {
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OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_ITERATION_COUNT);
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return 0;
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}
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int ret = 0;
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EVP_MD_CTX ctx;
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EVP_MD_CTX_init(&ctx);
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uint8_t *pass_raw = NULL, *I = NULL;
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size_t pass_raw_len = 0, I_len = 0;
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// If |pass| is NULL, we use the empty string rather than {0, 0} as the raw
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// password.
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if (pass != NULL &&
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!ascii_to_ucs2(pass, pass_len, &pass_raw, &pass_raw_len)) {
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goto err;
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}
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// In the spec, |block_size| is called "v", but measured in bits.
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size_t block_size = EVP_MD_block_size(md);
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// 1. Construct a string, D (the "diversifier"), by concatenating v/8 copies
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// of ID.
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uint8_t D[EVP_MAX_MD_BLOCK_SIZE];
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OPENSSL_memset(D, id, block_size);
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// 2. Concatenate copies of the salt together to create a string S of length
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// v(ceiling(s/v)) bits (the final copy of the salt may be truncated to
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// create S). Note that if the salt is the empty string, then so is S.
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//
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// 3. Concatenate copies of the password together to create a string P of
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// length v(ceiling(p/v)) bits (the final copy of the password may be
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// truncated to create P). Note that if the password is the empty string,
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// then so is P.
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//
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// 4. Set I=S||P to be the concatenation of S and P.
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if (salt_len + block_size - 1 < salt_len ||
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pass_raw_len + block_size - 1 < pass_raw_len) {
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OPENSSL_PUT_ERROR(PKCS8, ERR_R_OVERFLOW);
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goto err;
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}
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size_t S_len = block_size * ((salt_len + block_size - 1) / block_size);
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size_t P_len = block_size * ((pass_raw_len + block_size - 1) / block_size);
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I_len = S_len + P_len;
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if (I_len < S_len) {
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OPENSSL_PUT_ERROR(PKCS8, ERR_R_OVERFLOW);
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goto err;
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}
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I = OPENSSL_malloc(I_len);
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if (I_len != 0 && I == NULL) {
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OPENSSL_PUT_ERROR(PKCS8, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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for (size_t i = 0; i < S_len; i++) {
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I[i] = salt[i % salt_len];
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}
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for (size_t i = 0; i < P_len; i++) {
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I[i + S_len] = pass_raw[i % pass_raw_len];
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}
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while (out_len != 0) {
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// A. Set A_i=H^r(D||I). (i.e., the r-th hash of D||I,
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// H(H(H(... H(D||I))))
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uint8_t A[EVP_MAX_MD_SIZE];
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unsigned A_len;
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if (!EVP_DigestInit_ex(&ctx, md, NULL) ||
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!EVP_DigestUpdate(&ctx, D, block_size) ||
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!EVP_DigestUpdate(&ctx, I, I_len) ||
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!EVP_DigestFinal_ex(&ctx, A, &A_len)) {
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goto err;
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}
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for (unsigned iter = 1; iter < iterations; iter++) {
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if (!EVP_DigestInit_ex(&ctx, md, NULL) ||
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!EVP_DigestUpdate(&ctx, A, A_len) ||
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!EVP_DigestFinal_ex(&ctx, A, &A_len)) {
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goto err;
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}
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}
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size_t todo = out_len < A_len ? out_len : A_len;
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OPENSSL_memcpy(out, A, todo);
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out += todo;
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out_len -= todo;
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if (out_len == 0) {
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break;
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}
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// B. Concatenate copies of A_i to create a string B of length v bits (the
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// final copy of A_i may be truncated to create B).
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uint8_t B[EVP_MAX_MD_BLOCK_SIZE];
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for (size_t i = 0; i < block_size; i++) {
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B[i] = A[i % A_len];
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}
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// C. Treating I as a concatenation I_0, I_1, ..., I_(k-1) of v-bit blocks,
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// where k=ceiling(s/v)+ceiling(p/v), modify I by setting I_j=(I_j+B+1) mod
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// 2^v for each j.
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assert(I_len % block_size == 0);
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for (size_t i = 0; i < I_len; i += block_size) {
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unsigned carry = 1;
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for (size_t j = block_size - 1; j < block_size; j--) {
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carry += I[i + j] + B[j];
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I[i + j] = (uint8_t)carry;
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carry >>= 8;
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}
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}
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}
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ret = 1;
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err:
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OPENSSL_free(I);
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OPENSSL_free(pass_raw);
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EVP_MD_CTX_cleanup(&ctx);
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return ret;
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}
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static int pkcs12_pbe_cipher_init(const struct pbe_suite *suite,
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EVP_CIPHER_CTX *ctx, unsigned iterations,
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const char *pass, size_t pass_len,
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const uint8_t *salt, size_t salt_len,
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int is_encrypt) {
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const EVP_CIPHER *cipher = suite->cipher_func();
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const EVP_MD *md = suite->md_func();
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uint8_t key[EVP_MAX_KEY_LENGTH];
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uint8_t iv[EVP_MAX_IV_LENGTH];
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if (!pkcs12_key_gen(pass, pass_len, salt, salt_len, PKCS12_KEY_ID, iterations,
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EVP_CIPHER_key_length(cipher), key, md) ||
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!pkcs12_key_gen(pass, pass_len, salt, salt_len, PKCS12_IV_ID, iterations,
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EVP_CIPHER_iv_length(cipher), iv, md)) {
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OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_KEY_GEN_ERROR);
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return 0;
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}
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int ret = EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, is_encrypt);
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OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
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OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH);
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return ret;
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}
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static int pkcs12_pbe_decrypt_init(const struct pbe_suite *suite,
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EVP_CIPHER_CTX *ctx, const char *pass,
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size_t pass_len, CBS *param) {
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CBS pbe_param, salt;
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uint64_t iterations;
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if (!CBS_get_asn1(param, &pbe_param, CBS_ASN1_SEQUENCE) ||
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!CBS_get_asn1(&pbe_param, &salt, CBS_ASN1_OCTETSTRING) ||
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!CBS_get_asn1_uint64(&pbe_param, &iterations) ||
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CBS_len(&pbe_param) != 0 ||
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CBS_len(param) != 0) {
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OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_DECODE_ERROR);
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return 0;
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}
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if (iterations == 0 || iterations > UINT_MAX) {
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OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_ITERATION_COUNT);
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return 0;
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}
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return pkcs12_pbe_cipher_init(suite, ctx, (unsigned)iterations, pass,
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pass_len, CBS_data(&salt), CBS_len(&salt),
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0 /* decrypt */);
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}
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static const struct pbe_suite kBuiltinPBE[] = {
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{
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NID_pbe_WithSHA1And40BitRC2_CBC,
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// 1.2.840.113549.1.12.1.6
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{0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x0c, 0x01, 0x06},
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10,
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EVP_rc2_40_cbc,
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EVP_sha1,
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pkcs12_pbe_decrypt_init,
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},
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{
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NID_pbe_WithSHA1And128BitRC4,
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// 1.2.840.113549.1.12.1.1
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{0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x0c, 0x01, 0x01},
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10,
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EVP_rc4,
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EVP_sha1,
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pkcs12_pbe_decrypt_init,
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},
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{
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NID_pbe_WithSHA1And3_Key_TripleDES_CBC,
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// 1.2.840.113549.1.12.1.3
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{0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x0c, 0x01, 0x03},
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10,
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EVP_des_ede3_cbc,
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EVP_sha1,
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pkcs12_pbe_decrypt_init,
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},
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{
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NID_pbes2,
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// 1.2.840.113549.1.5.13
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{0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x05, 0x0d},
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9,
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NULL,
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NULL,
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PKCS5_pbe2_decrypt_init,
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},
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};
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static const struct pbe_suite *get_pbe_suite(int pbe_nid) {
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for (unsigned i = 0; i < OPENSSL_ARRAY_SIZE(kBuiltinPBE); i++) {
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if (kBuiltinPBE[i].pbe_nid == pbe_nid) {
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return &kBuiltinPBE[i];
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}
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}
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return NULL;
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}
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static int pkcs12_pbe_encrypt_init(CBB *out, EVP_CIPHER_CTX *ctx, int alg,
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unsigned iterations, const char *pass,
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size_t pass_len, const uint8_t *salt,
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size_t salt_len) {
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const struct pbe_suite *suite = get_pbe_suite(alg);
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if (suite == NULL) {
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OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_UNKNOWN_ALGORITHM);
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return 0;
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}
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// See RFC 2898, appendix A.3.
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CBB algorithm, oid, param, salt_cbb;
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if (!CBB_add_asn1(out, &algorithm, CBS_ASN1_SEQUENCE) ||
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!CBB_add_asn1(&algorithm, &oid, CBS_ASN1_OBJECT) ||
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!CBB_add_bytes(&oid, suite->oid, suite->oid_len) ||
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!CBB_add_asn1(&algorithm, ¶m, CBS_ASN1_SEQUENCE) ||
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!CBB_add_asn1(¶m, &salt_cbb, CBS_ASN1_OCTETSTRING) ||
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!CBB_add_bytes(&salt_cbb, salt, salt_len) ||
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!CBB_add_asn1_uint64(¶m, iterations) ||
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!CBB_flush(out)) {
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return 0;
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}
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return pkcs12_pbe_cipher_init(suite, ctx, iterations, pass, pass_len, salt,
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salt_len, 1 /* encrypt */);
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}
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int pkcs8_pbe_decrypt(uint8_t **out, size_t *out_len, CBS *algorithm,
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const char *pass, size_t pass_len, const uint8_t *in,
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size_t in_len) {
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int ret = 0;
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uint8_t *buf = NULL;;
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EVP_CIPHER_CTX ctx;
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EVP_CIPHER_CTX_init(&ctx);
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CBS obj;
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if (!CBS_get_asn1(algorithm, &obj, CBS_ASN1_OBJECT)) {
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OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_DECODE_ERROR);
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goto err;
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}
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const struct pbe_suite *suite = NULL;
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for (unsigned i = 0; i < OPENSSL_ARRAY_SIZE(kBuiltinPBE); i++) {
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if (CBS_mem_equal(&obj, kBuiltinPBE[i].oid, kBuiltinPBE[i].oid_len)) {
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suite = &kBuiltinPBE[i];
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break;
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}
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}
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if (suite == NULL) {
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OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_UNKNOWN_ALGORITHM);
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goto err;
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}
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if (!suite->decrypt_init(suite, &ctx, pass, pass_len, algorithm)) {
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OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_KEYGEN_FAILURE);
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goto err;
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}
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buf = OPENSSL_malloc(in_len);
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if (buf == NULL) {
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OPENSSL_PUT_ERROR(PKCS8, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (in_len > INT_MAX) {
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OPENSSL_PUT_ERROR(PKCS8, ERR_R_OVERFLOW);
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goto err;
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}
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int n1, n2;
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if (!EVP_DecryptUpdate(&ctx, buf, &n1, in, (int)in_len) ||
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!EVP_DecryptFinal_ex(&ctx, buf + n1, &n2)) {
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goto err;
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}
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*out = buf;
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*out_len = n1 + n2;
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ret = 1;
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buf = NULL;
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err:
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OPENSSL_free(buf);
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EVP_CIPHER_CTX_cleanup(&ctx);
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return ret;
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}
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EVP_PKEY *PKCS8_parse_encrypted_private_key(CBS *cbs, const char *pass,
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size_t pass_len) {
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// See RFC 5208, section 6.
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CBS epki, algorithm, ciphertext;
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if (!CBS_get_asn1(cbs, &epki, CBS_ASN1_SEQUENCE) ||
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!CBS_get_asn1(&epki, &algorithm, CBS_ASN1_SEQUENCE) ||
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!CBS_get_asn1(&epki, &ciphertext, CBS_ASN1_OCTETSTRING) ||
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CBS_len(&epki) != 0) {
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OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_DECODE_ERROR);
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return 0;
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}
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uint8_t *out;
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size_t out_len;
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if (!pkcs8_pbe_decrypt(&out, &out_len, &algorithm, pass, pass_len,
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CBS_data(&ciphertext), CBS_len(&ciphertext))) {
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return 0;
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}
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CBS pki;
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CBS_init(&pki, out, out_len);
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EVP_PKEY *ret = EVP_parse_private_key(&pki);
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OPENSSL_free(out);
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return ret;
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}
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int PKCS8_marshal_encrypted_private_key(CBB *out, int pbe_nid,
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const EVP_CIPHER *cipher,
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const char *pass, size_t pass_len,
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const uint8_t *salt, size_t salt_len,
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int iterations, const EVP_PKEY *pkey) {
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int ret = 0;
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uint8_t *plaintext = NULL, *salt_buf = NULL;
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size_t plaintext_len = 0;
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EVP_CIPHER_CTX ctx;
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EVP_CIPHER_CTX_init(&ctx);
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// Generate a random salt if necessary.
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if (salt == NULL) {
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if (salt_len == 0) {
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salt_len = PKCS5_SALT_LEN;
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}
|
|
|
|
salt_buf = OPENSSL_malloc(salt_len);
|
|
if (salt_buf == NULL ||
|
|
!RAND_bytes(salt_buf, salt_len)) {
|
|
goto err;
|
|
}
|
|
|
|
salt = salt_buf;
|
|
}
|
|
|
|
if (iterations <= 0) {
|
|
iterations = PKCS5_DEFAULT_ITERATIONS;
|
|
}
|
|
|
|
// Serialize the input key.
|
|
CBB plaintext_cbb;
|
|
if (!CBB_init(&plaintext_cbb, 128) ||
|
|
!EVP_marshal_private_key(&plaintext_cbb, pkey) ||
|
|
!CBB_finish(&plaintext_cbb, &plaintext, &plaintext_len)) {
|
|
CBB_cleanup(&plaintext_cbb);
|
|
goto err;
|
|
}
|
|
|
|
CBB epki;
|
|
if (!CBB_add_asn1(out, &epki, CBS_ASN1_SEQUENCE)) {
|
|
goto err;
|
|
}
|
|
|
|
int alg_ok;
|
|
if (pbe_nid == -1) {
|
|
alg_ok = PKCS5_pbe2_encrypt_init(&epki, &ctx, cipher, (unsigned)iterations,
|
|
pass, pass_len, salt, salt_len);
|
|
} else {
|
|
alg_ok = pkcs12_pbe_encrypt_init(&epki, &ctx, pbe_nid, (unsigned)iterations,
|
|
pass, pass_len, salt, salt_len);
|
|
}
|
|
if (!alg_ok) {
|
|
goto err;
|
|
}
|
|
|
|
size_t max_out = plaintext_len + EVP_CIPHER_CTX_block_size(&ctx);
|
|
if (max_out < plaintext_len) {
|
|
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_TOO_LONG);
|
|
goto err;
|
|
}
|
|
|
|
CBB ciphertext;
|
|
uint8_t *ptr;
|
|
int n1, n2;
|
|
if (!CBB_add_asn1(&epki, &ciphertext, CBS_ASN1_OCTETSTRING) ||
|
|
!CBB_reserve(&ciphertext, &ptr, max_out) ||
|
|
!EVP_CipherUpdate(&ctx, ptr, &n1, plaintext, plaintext_len) ||
|
|
!EVP_CipherFinal_ex(&ctx, ptr + n1, &n2) ||
|
|
!CBB_did_write(&ciphertext, n1 + n2) ||
|
|
!CBB_flush(out)) {
|
|
goto err;
|
|
}
|
|
|
|
ret = 1;
|
|
|
|
err:
|
|
OPENSSL_free(plaintext);
|
|
OPENSSL_free(salt_buf);
|
|
EVP_CIPHER_CTX_cleanup(&ctx);
|
|
return ret;
|
|
}
|