mirror of
https://github.com/openssl/openssl.git
synced 2024-11-27 05:21:51 +08:00
413 lines
9.6 KiB
C
413 lines
9.6 KiB
C
/*
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* Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifdef OPENSSL_NO_CT
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# error "CT is disabled"
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#endif
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#include <limits.h>
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#include <string.h>
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#include <openssl/asn1.h>
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#include <openssl/buffer.h>
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#include <openssl/ct.h>
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#include <openssl/err.h>
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#include "ct_locl.h"
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int o2i_SCT_signature(SCT *sct, const unsigned char **in, size_t len)
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{
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size_t siglen;
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size_t len_remaining = len;
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const unsigned char *p;
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if (sct->version != SCT_VERSION_V1) {
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CTerr(CT_F_O2I_SCT_SIGNATURE, CT_R_UNSUPPORTED_VERSION);
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return -1;
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}
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/*
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* digitally-signed struct header: (1 byte) Hash algorithm (1 byte)
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* Signature algorithm (2 bytes + ?) Signature
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*
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* This explicitly rejects empty signatures: they're invalid for
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* all supported algorithms.
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*/
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if (len <= 4) {
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CTerr(CT_F_O2I_SCT_SIGNATURE, CT_R_SCT_INVALID_SIGNATURE);
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return -1;
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}
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p = *in;
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/* Get hash and signature algorithm */
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sct->hash_alg = *p++;
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sct->sig_alg = *p++;
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if (SCT_get_signature_nid(sct) == NID_undef) {
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CTerr(CT_F_O2I_SCT_SIGNATURE, CT_R_SCT_INVALID_SIGNATURE);
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return -1;
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}
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/* Retrieve signature and check it is consistent with the buffer length */
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n2s(p, siglen);
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len_remaining -= (p - *in);
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if (siglen > len_remaining) {
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CTerr(CT_F_O2I_SCT_SIGNATURE, CT_R_SCT_INVALID_SIGNATURE);
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return -1;
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}
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if (SCT_set1_signature(sct, p, siglen) != 1)
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return -1;
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len_remaining -= siglen;
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*in = p + siglen;
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return len - len_remaining;
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}
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SCT *o2i_SCT(SCT **psct, const unsigned char **in, size_t len)
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{
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SCT *sct = NULL;
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const unsigned char *p;
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if (len == 0 || len > MAX_SCT_SIZE) {
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CTerr(CT_F_O2I_SCT, CT_R_SCT_INVALID);
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goto err;
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}
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if ((sct = SCT_new()) == NULL)
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goto err;
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p = *in;
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sct->version = *p;
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if (sct->version == SCT_VERSION_V1) {
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int sig_len;
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size_t len2;
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/*-
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* Fixed-length header:
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* struct {
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* Version sct_version; (1 byte)
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* log_id id; (32 bytes)
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* uint64 timestamp; (8 bytes)
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* CtExtensions extensions; (2 bytes + ?)
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* }
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*/
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if (len < 43) {
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CTerr(CT_F_O2I_SCT, CT_R_SCT_INVALID);
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goto err;
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}
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len -= 43;
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p++;
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sct->log_id = BUF_memdup(p, CT_V1_HASHLEN);
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if (sct->log_id == NULL)
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goto err;
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sct->log_id_len = CT_V1_HASHLEN;
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p += CT_V1_HASHLEN;
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n2l8(p, sct->timestamp);
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n2s(p, len2);
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if (len < len2) {
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CTerr(CT_F_O2I_SCT, CT_R_SCT_INVALID);
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goto err;
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}
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if (len2 > 0) {
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sct->ext = BUF_memdup(p, len2);
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if (sct->ext == NULL)
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goto err;
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}
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sct->ext_len = len2;
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p += len2;
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len -= len2;
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sig_len = o2i_SCT_signature(sct, &p, len);
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if (sig_len <= 0) {
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CTerr(CT_F_O2I_SCT, CT_R_SCT_INVALID);
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goto err;
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}
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len -= sig_len;
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*in = p + len;
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} else {
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/* If not V1 just cache encoding */
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sct->sct = BUF_memdup(p, len);
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if (sct->sct == NULL)
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goto err;
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sct->sct_len = len;
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*in = p + len;
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}
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if (psct != NULL) {
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SCT_free(*psct);
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*psct = sct;
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}
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return sct;
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err:
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SCT_free(sct);
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return NULL;
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}
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int i2o_SCT_signature(const SCT *sct, unsigned char **out)
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{
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size_t len;
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unsigned char *p = NULL;
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if (!SCT_signature_is_complete(sct)) {
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CTerr(CT_F_I2O_SCT_SIGNATURE, CT_R_SCT_INVALID_SIGNATURE);
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goto err;
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}
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if (sct->version != SCT_VERSION_V1) {
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CTerr(CT_F_I2O_SCT_SIGNATURE, CT_R_UNSUPPORTED_VERSION);
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goto err;
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}
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/*
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* (1 byte) Hash algorithm
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* (1 byte) Signature algorithm
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* (2 bytes + ?) Signature
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*/
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len = 4 + sct->sig_len;
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if (out != NULL) {
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if (*out != NULL) {
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p = *out;
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*out += len;
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} else {
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p = OPENSSL_malloc(len);
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if (p == NULL) {
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CTerr(CT_F_I2O_SCT_SIGNATURE, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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*out = p;
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}
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*p++ = sct->hash_alg;
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*p++ = sct->sig_alg;
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s2n(sct->sig_len, p);
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memcpy(p, sct->sig, sct->sig_len);
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}
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return len;
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err:
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OPENSSL_free(p);
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return -1;
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}
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int i2o_SCT(const SCT *sct, unsigned char **out)
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{
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size_t len;
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unsigned char *p = NULL;
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if (!SCT_is_complete(sct)) {
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CTerr(CT_F_I2O_SCT, CT_R_SCT_NOT_SET);
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goto err;
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}
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/*
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* Fixed-length header: struct { (1 byte) Version sct_version; (32 bytes)
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* log_id id; (8 bytes) uint64 timestamp; (2 bytes + ?) CtExtensions
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* extensions; (1 byte) Hash algorithm (1 byte) Signature algorithm (2
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* bytes + ?) Signature
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*/
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if (sct->version == SCT_VERSION_V1)
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len = 43 + sct->ext_len + 4 + sct->sig_len;
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else
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len = sct->sct_len;
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if (out == NULL)
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return len;
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if (*out != NULL) {
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p = *out;
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*out += len;
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} else {
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p = OPENSSL_malloc(len);
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if (p == NULL) {
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CTerr(CT_F_I2O_SCT, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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*out = p;
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}
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if (sct->version == SCT_VERSION_V1) {
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*p++ = sct->version;
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memcpy(p, sct->log_id, CT_V1_HASHLEN);
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p += CT_V1_HASHLEN;
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l2n8(sct->timestamp, p);
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s2n(sct->ext_len, p);
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if (sct->ext_len > 0) {
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memcpy(p, sct->ext, sct->ext_len);
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p += sct->ext_len;
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}
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if (i2o_SCT_signature(sct, &p) <= 0)
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goto err;
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} else {
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memcpy(p, sct->sct, len);
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}
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return len;
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err:
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OPENSSL_free(p);
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return -1;
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}
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void SCT_LIST_free(STACK_OF(SCT) *a)
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{
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sk_SCT_pop_free(a, SCT_free);
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}
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STACK_OF(SCT) *o2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
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size_t len)
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{
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STACK_OF(SCT) *sk = NULL;
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size_t list_len, sct_len;
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if (len < 2 || len > MAX_SCT_LIST_SIZE) {
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CTerr(CT_F_O2I_SCT_LIST, CT_R_SCT_LIST_INVALID);
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return NULL;
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}
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n2s(*pp, list_len);
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if (list_len != len - 2) {
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CTerr(CT_F_O2I_SCT_LIST, CT_R_SCT_LIST_INVALID);
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return NULL;
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}
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if (a == NULL || *a == NULL) {
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sk = sk_SCT_new_null();
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if (sk == NULL)
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return NULL;
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} else {
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SCT *sct;
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/* Use the given stack, but empty it first. */
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sk = *a;
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while ((sct = sk_SCT_pop(sk)) != NULL)
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SCT_free(sct);
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}
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while (list_len > 0) {
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SCT *sct;
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if (list_len < 2) {
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CTerr(CT_F_O2I_SCT_LIST, CT_R_SCT_LIST_INVALID);
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goto err;
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}
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n2s(*pp, sct_len);
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list_len -= 2;
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if (sct_len == 0 || sct_len > list_len) {
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CTerr(CT_F_O2I_SCT_LIST, CT_R_SCT_LIST_INVALID);
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goto err;
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}
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list_len -= sct_len;
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if ((sct = o2i_SCT(NULL, pp, sct_len)) == NULL)
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goto err;
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if (!sk_SCT_push(sk, sct)) {
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SCT_free(sct);
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goto err;
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}
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}
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if (a != NULL && *a == NULL)
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*a = sk;
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return sk;
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err:
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if (a == NULL || *a == NULL)
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SCT_LIST_free(sk);
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return NULL;
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}
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int i2o_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **pp)
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{
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int len, sct_len, i, is_pp_new = 0;
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size_t len2;
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unsigned char *p = NULL, *p2;
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if (pp != NULL) {
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if (*pp == NULL) {
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if ((len = i2o_SCT_LIST(a, NULL)) == -1) {
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CTerr(CT_F_I2O_SCT_LIST, CT_R_SCT_LIST_INVALID);
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return -1;
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}
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if ((*pp = OPENSSL_malloc(len)) == NULL) {
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CTerr(CT_F_I2O_SCT_LIST, ERR_R_MALLOC_FAILURE);
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return -1;
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}
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is_pp_new = 1;
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}
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p = *pp + 2;
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}
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len2 = 2;
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for (i = 0; i < sk_SCT_num(a); i++) {
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if (pp != NULL) {
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p2 = p;
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p += 2;
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if ((sct_len = i2o_SCT(sk_SCT_value(a, i), &p)) == -1)
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goto err;
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s2n(sct_len, p2);
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} else {
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if ((sct_len = i2o_SCT(sk_SCT_value(a, i), NULL)) == -1)
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goto err;
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}
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len2 += 2 + sct_len;
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}
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if (len2 > MAX_SCT_LIST_SIZE)
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goto err;
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if (pp != NULL) {
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p = *pp;
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s2n(len2 - 2, p);
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}
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if (!is_pp_new)
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*pp += len2;
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return len2;
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err:
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if (is_pp_new) {
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OPENSSL_free(*pp);
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*pp = NULL;
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}
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return -1;
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}
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STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
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long len)
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{
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ASN1_OCTET_STRING *oct = NULL;
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STACK_OF(SCT) *sk = NULL;
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const unsigned char *p;
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p = *pp;
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if (d2i_ASN1_OCTET_STRING(&oct, &p, len) == NULL)
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return NULL;
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p = oct->data;
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if ((sk = o2i_SCT_LIST(a, &p, oct->length)) != NULL)
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*pp += len;
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ASN1_OCTET_STRING_free(oct);
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return sk;
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}
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int i2d_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **out)
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{
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ASN1_OCTET_STRING oct;
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int len;
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oct.data = NULL;
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if ((oct.length = i2o_SCT_LIST(a, &oct.data)) == -1)
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return -1;
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len = i2d_ASN1_OCTET_STRING(&oct, out);
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OPENSSL_free(oct.data);
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return len;
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}
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