--- /dev/null
+/*
+ * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (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_locl.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) {
+ CTerr(CT_F_O2I_SCT_SIGNATURE, 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) {
+ CTerr(CT_F_O2I_SCT_SIGNATURE, 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) {
+ CTerr(CT_F_O2I_SCT_SIGNATURE, 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) {
+ CTerr(CT_F_O2I_SCT_SIGNATURE, 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) {
+ CTerr(CT_F_O2I_SCT, 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) {
+ CTerr(CT_F_O2I_SCT, CT_R_SCT_INVALID);
+ goto err;
+ }
+ len -= 43;
+ p++;
+ sct->log_id = BUF_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) {
+ CTerr(CT_F_O2I_SCT, CT_R_SCT_INVALID);
+ goto err;
+ }
+ if (len2 > 0) {
+ sct->ext = BUF_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) {
+ CTerr(CT_F_O2I_SCT, CT_R_SCT_INVALID);
+ goto err;
+ }
+ len -= sig_len;
+ *in = p + len;
+ } else {
+ /* If not V1 just cache encoding */
+ sct->sct = BUF_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;
+
+ if (!SCT_signature_is_complete(sct)) {
+ CTerr(CT_F_I2O_SCT_SIGNATURE, CT_R_SCT_INVALID_SIGNATURE);
+ goto err;
+ }
+
+ if (sct->version != SCT_VERSION_V1) {
+ CTerr(CT_F_I2O_SCT_SIGNATURE, 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 {
+ p = OPENSSL_malloc(len);
+ if (p == NULL) {
+ CTerr(CT_F_I2O_SCT_SIGNATURE, ERR_R_MALLOC_FAILURE);
+ 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(p);
+ return -1;
+}
+
+int i2o_SCT(const SCT *sct, unsigned char **out)
+{
+ size_t len;
+ unsigned char *p = NULL;
+
+ if (!SCT_is_complete(sct)) {
+ CTerr(CT_F_I2O_SCT, 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 {
+ p = OPENSSL_malloc(len);
+ if (p == NULL) {
+ CTerr(CT_F_I2O_SCT, ERR_R_MALLOC_FAILURE);
+ 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(p);
+ return -1;
+}
+
+void SCT_LIST_free(STACK_OF(SCT) *a)
+{
+ sk_SCT_pop_free(a, SCT_free);
+}
+
+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) {
+ CTerr(CT_F_O2I_SCT_LIST, CT_R_SCT_LIST_INVALID);
+ return NULL;
+ }
+
+ n2s(*pp, list_len);
+ if (list_len != len - 2) {
+ CTerr(CT_F_O2I_SCT_LIST, 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) {
+ CTerr(CT_F_O2I_SCT_LIST, CT_R_SCT_LIST_INVALID);
+ goto err;
+ }
+ n2s(*pp, sct_len);
+ list_len -= 2;
+
+ if (sct_len == 0 || sct_len > list_len) {
+ CTerr(CT_F_O2I_SCT_LIST, 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) {
+ CTerr(CT_F_I2O_SCT_LIST, CT_R_SCT_LIST_INVALID);
+ return -1;
+ }
+ if ((*pp = OPENSSL_malloc(len)) == NULL) {
+ CTerr(CT_F_I2O_SCT_LIST, ERR_R_MALLOC_FAILURE);
+ 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;
+}
projects / cassiopeia.git / blobdiff