402 lines
9.3 KiB
C
402 lines
9.3 KiB
C
/*
|
|
* Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
|
|
*
|
|
* Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
* this file except in compliance with the License. You can obtain a copy
|
|
* in the file LICENSE in the source distribution or at
|
|
* https://www.openssl.org/source/license.html
|
|
*/
|
|
|
|
#ifdef OPENSSL_NO_CT
|
|
# error "CT is disabled"
|
|
#endif
|
|
|
|
#include <limits.h>
|
|
#include <string.h>
|
|
|
|
#include <openssl/asn1.h>
|
|
#include <openssl/buffer.h>
|
|
#include <openssl/ct.h>
|
|
#include <openssl/err.h>
|
|
|
|
#include "ct_local.h"
|
|
|
|
int o2i_SCT_signature(SCT *sct, const unsigned char **in, size_t len)
|
|
{
|
|
size_t siglen;
|
|
size_t len_remaining = len;
|
|
const unsigned char *p;
|
|
|
|
if (sct->version != SCT_VERSION_V1) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_UNSUPPORTED_VERSION);
|
|
return -1;
|
|
}
|
|
/*
|
|
* digitally-signed struct header: (1 byte) Hash algorithm (1 byte)
|
|
* Signature algorithm (2 bytes + ?) Signature
|
|
*
|
|
* This explicitly rejects empty signatures: they're invalid for
|
|
* all supported algorithms.
|
|
*/
|
|
if (len <= 4) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_SCT_INVALID_SIGNATURE);
|
|
return -1;
|
|
}
|
|
|
|
p = *in;
|
|
/* Get hash and signature algorithm */
|
|
sct->hash_alg = *p++;
|
|
sct->sig_alg = *p++;
|
|
if (SCT_get_signature_nid(sct) == NID_undef) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_SCT_INVALID_SIGNATURE);
|
|
return -1;
|
|
}
|
|
/* Retrieve signature and check it is consistent with the buffer length */
|
|
n2s(p, siglen);
|
|
len_remaining -= (p - *in);
|
|
if (siglen > len_remaining) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_SCT_INVALID_SIGNATURE);
|
|
return -1;
|
|
}
|
|
|
|
if (SCT_set1_signature(sct, p, siglen) != 1)
|
|
return -1;
|
|
len_remaining -= siglen;
|
|
*in = p + siglen;
|
|
|
|
return len - len_remaining;
|
|
}
|
|
|
|
SCT *o2i_SCT(SCT **psct, const unsigned char **in, size_t len)
|
|
{
|
|
SCT *sct = NULL;
|
|
const unsigned char *p;
|
|
|
|
if (len == 0 || len > MAX_SCT_SIZE) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_SCT_INVALID);
|
|
goto err;
|
|
}
|
|
|
|
if ((sct = SCT_new()) == NULL)
|
|
goto err;
|
|
|
|
p = *in;
|
|
|
|
sct->version = *p;
|
|
if (sct->version == SCT_VERSION_V1) {
|
|
int sig_len;
|
|
size_t len2;
|
|
/*-
|
|
* Fixed-length header:
|
|
* struct {
|
|
* Version sct_version; (1 byte)
|
|
* log_id id; (32 bytes)
|
|
* uint64 timestamp; (8 bytes)
|
|
* CtExtensions extensions; (2 bytes + ?)
|
|
* }
|
|
*/
|
|
if (len < 43) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_SCT_INVALID);
|
|
goto err;
|
|
}
|
|
len -= 43;
|
|
p++;
|
|
sct->log_id = OPENSSL_memdup(p, CT_V1_HASHLEN);
|
|
if (sct->log_id == NULL)
|
|
goto err;
|
|
sct->log_id_len = CT_V1_HASHLEN;
|
|
p += CT_V1_HASHLEN;
|
|
|
|
n2l8(p, sct->timestamp);
|
|
|
|
n2s(p, len2);
|
|
if (len < len2) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_SCT_INVALID);
|
|
goto err;
|
|
}
|
|
if (len2 > 0) {
|
|
sct->ext = OPENSSL_memdup(p, len2);
|
|
if (sct->ext == NULL)
|
|
goto err;
|
|
}
|
|
sct->ext_len = len2;
|
|
p += len2;
|
|
len -= len2;
|
|
|
|
sig_len = o2i_SCT_signature(sct, &p, len);
|
|
if (sig_len <= 0) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_SCT_INVALID);
|
|
goto err;
|
|
}
|
|
len -= sig_len;
|
|
*in = p + len;
|
|
} else {
|
|
/* If not V1 just cache encoding */
|
|
sct->sct = OPENSSL_memdup(p, len);
|
|
if (sct->sct == NULL)
|
|
goto err;
|
|
sct->sct_len = len;
|
|
*in = p + len;
|
|
}
|
|
|
|
if (psct != NULL) {
|
|
SCT_free(*psct);
|
|
*psct = sct;
|
|
}
|
|
|
|
return sct;
|
|
err:
|
|
SCT_free(sct);
|
|
return NULL;
|
|
}
|
|
|
|
int i2o_SCT_signature(const SCT *sct, unsigned char **out)
|
|
{
|
|
size_t len;
|
|
unsigned char *p = NULL, *pstart = NULL;
|
|
|
|
if (!SCT_signature_is_complete(sct)) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_SCT_INVALID_SIGNATURE);
|
|
goto err;
|
|
}
|
|
|
|
if (sct->version != SCT_VERSION_V1) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_UNSUPPORTED_VERSION);
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* (1 byte) Hash algorithm
|
|
* (1 byte) Signature algorithm
|
|
* (2 bytes + ?) Signature
|
|
*/
|
|
len = 4 + sct->sig_len;
|
|
|
|
if (out != NULL) {
|
|
if (*out != NULL) {
|
|
p = *out;
|
|
*out += len;
|
|
} else {
|
|
pstart = p = OPENSSL_malloc(len);
|
|
if (p == NULL)
|
|
goto err;
|
|
*out = p;
|
|
}
|
|
|
|
*p++ = sct->hash_alg;
|
|
*p++ = sct->sig_alg;
|
|
s2n(sct->sig_len, p);
|
|
memcpy(p, sct->sig, sct->sig_len);
|
|
}
|
|
|
|
return len;
|
|
err:
|
|
OPENSSL_free(pstart);
|
|
return -1;
|
|
}
|
|
|
|
int i2o_SCT(const SCT *sct, unsigned char **out)
|
|
{
|
|
size_t len;
|
|
unsigned char *p = NULL, *pstart = NULL;
|
|
|
|
if (!SCT_is_complete(sct)) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_SCT_NOT_SET);
|
|
goto err;
|
|
}
|
|
/*
|
|
* Fixed-length header: struct { (1 byte) Version sct_version; (32 bytes)
|
|
* log_id id; (8 bytes) uint64 timestamp; (2 bytes + ?) CtExtensions
|
|
* extensions; (1 byte) Hash algorithm (1 byte) Signature algorithm (2
|
|
* bytes + ?) Signature
|
|
*/
|
|
if (sct->version == SCT_VERSION_V1)
|
|
len = 43 + sct->ext_len + 4 + sct->sig_len;
|
|
else
|
|
len = sct->sct_len;
|
|
|
|
if (out == NULL)
|
|
return len;
|
|
|
|
if (*out != NULL) {
|
|
p = *out;
|
|
*out += len;
|
|
} else {
|
|
pstart = p = OPENSSL_malloc(len);
|
|
if (p == NULL)
|
|
goto err;
|
|
*out = p;
|
|
}
|
|
|
|
if (sct->version == SCT_VERSION_V1) {
|
|
*p++ = sct->version;
|
|
memcpy(p, sct->log_id, CT_V1_HASHLEN);
|
|
p += CT_V1_HASHLEN;
|
|
l2n8(sct->timestamp, p);
|
|
s2n(sct->ext_len, p);
|
|
if (sct->ext_len > 0) {
|
|
memcpy(p, sct->ext, sct->ext_len);
|
|
p += sct->ext_len;
|
|
}
|
|
if (i2o_SCT_signature(sct, &p) <= 0)
|
|
goto err;
|
|
} else {
|
|
memcpy(p, sct->sct, len);
|
|
}
|
|
|
|
return len;
|
|
err:
|
|
OPENSSL_free(pstart);
|
|
return -1;
|
|
}
|
|
|
|
STACK_OF(SCT) *o2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
|
|
size_t len)
|
|
{
|
|
STACK_OF(SCT) *sk = NULL;
|
|
size_t list_len, sct_len;
|
|
|
|
if (len < 2 || len > MAX_SCT_LIST_SIZE) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_SCT_LIST_INVALID);
|
|
return NULL;
|
|
}
|
|
|
|
n2s(*pp, list_len);
|
|
if (list_len != len - 2) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_SCT_LIST_INVALID);
|
|
return NULL;
|
|
}
|
|
|
|
if (a == NULL || *a == NULL) {
|
|
sk = sk_SCT_new_null();
|
|
if (sk == NULL)
|
|
return NULL;
|
|
} else {
|
|
SCT *sct;
|
|
|
|
/* Use the given stack, but empty it first. */
|
|
sk = *a;
|
|
while ((sct = sk_SCT_pop(sk)) != NULL)
|
|
SCT_free(sct);
|
|
}
|
|
|
|
while (list_len > 0) {
|
|
SCT *sct;
|
|
|
|
if (list_len < 2) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_SCT_LIST_INVALID);
|
|
goto err;
|
|
}
|
|
n2s(*pp, sct_len);
|
|
list_len -= 2;
|
|
|
|
if (sct_len == 0 || sct_len > list_len) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_SCT_LIST_INVALID);
|
|
goto err;
|
|
}
|
|
list_len -= sct_len;
|
|
|
|
if ((sct = o2i_SCT(NULL, pp, sct_len)) == NULL)
|
|
goto err;
|
|
if (!sk_SCT_push(sk, sct)) {
|
|
SCT_free(sct);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
if (a != NULL && *a == NULL)
|
|
*a = sk;
|
|
return sk;
|
|
|
|
err:
|
|
if (a == NULL || *a == NULL)
|
|
SCT_LIST_free(sk);
|
|
return NULL;
|
|
}
|
|
|
|
int i2o_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **pp)
|
|
{
|
|
int len, sct_len, i, is_pp_new = 0;
|
|
size_t len2;
|
|
unsigned char *p = NULL, *p2;
|
|
|
|
if (pp != NULL) {
|
|
if (*pp == NULL) {
|
|
if ((len = i2o_SCT_LIST(a, NULL)) == -1) {
|
|
ERR_raise(ERR_LIB_CT, CT_R_SCT_LIST_INVALID);
|
|
return -1;
|
|
}
|
|
if ((*pp = OPENSSL_malloc(len)) == NULL)
|
|
return -1;
|
|
is_pp_new = 1;
|
|
}
|
|
p = *pp + 2;
|
|
}
|
|
|
|
len2 = 2;
|
|
for (i = 0; i < sk_SCT_num(a); i++) {
|
|
if (pp != NULL) {
|
|
p2 = p;
|
|
p += 2;
|
|
if ((sct_len = i2o_SCT(sk_SCT_value(a, i), &p)) == -1)
|
|
goto err;
|
|
s2n(sct_len, p2);
|
|
} else {
|
|
if ((sct_len = i2o_SCT(sk_SCT_value(a, i), NULL)) == -1)
|
|
goto err;
|
|
}
|
|
len2 += 2 + sct_len;
|
|
}
|
|
|
|
if (len2 > MAX_SCT_LIST_SIZE)
|
|
goto err;
|
|
|
|
if (pp != NULL) {
|
|
p = *pp;
|
|
s2n(len2 - 2, p);
|
|
if (!is_pp_new)
|
|
*pp += len2;
|
|
}
|
|
return len2;
|
|
|
|
err:
|
|
if (is_pp_new) {
|
|
OPENSSL_free(*pp);
|
|
*pp = NULL;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
|
|
long len)
|
|
{
|
|
ASN1_OCTET_STRING *oct = NULL;
|
|
STACK_OF(SCT) *sk = NULL;
|
|
const unsigned char *p;
|
|
|
|
p = *pp;
|
|
if (d2i_ASN1_OCTET_STRING(&oct, &p, len) == NULL)
|
|
return NULL;
|
|
|
|
p = oct->data;
|
|
if ((sk = o2i_SCT_LIST(a, &p, oct->length)) != NULL)
|
|
*pp += len;
|
|
|
|
ASN1_OCTET_STRING_free(oct);
|
|
return sk;
|
|
}
|
|
|
|
int i2d_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **out)
|
|
{
|
|
ASN1_OCTET_STRING oct;
|
|
int len;
|
|
|
|
oct.data = NULL;
|
|
if ((oct.length = i2o_SCT_LIST(a, &oct.data)) == -1)
|
|
return -1;
|
|
|
|
len = i2d_ASN1_OCTET_STRING(&oct, out);
|
|
OPENSSL_free(oct.data);
|
|
return len;
|
|
}
|