ct_b64.c revision 1.5
1/* $OpenBSD: ct_b64.c,v 1.5 2021/12/18 16:34:52 tb Exp $ */ 2/* 3 * Written by Rob Stradling (rob@comodo.com) and Stephen Henson 4 * (steve@openssl.org) for the OpenSSL project 2014. 5 */ 6/* ==================================================================== 7 * Copyright (c) 2014 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * licensing@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59 60#include <limits.h> 61#include <string.h> 62 63#include <openssl/ct.h> 64#include <openssl/err.h> 65#include <openssl/evp.h> 66 67#include "ct_local.h" 68 69/* 70 * Decodes the base64 string |in| into |out|. 71 * A new string will be malloc'd and assigned to |out|. This will be owned by 72 * the caller. Do not provide a pre-allocated string in |out|. 73 */ 74static int 75ct_base64_decode(const char *in, unsigned char **out) 76{ 77 size_t inlen = strlen(in); 78 int outlen, i; 79 unsigned char *outbuf = NULL; 80 81 if (inlen == 0) { 82 *out = NULL; 83 return 0; 84 } 85 86 outlen = (inlen / 4) * 3; 87 outbuf = malloc(outlen); 88 if (outbuf == NULL) { 89 CTerror(ERR_R_MALLOC_FAILURE); 90 goto err; 91 } 92 93 outlen = EVP_DecodeBlock(outbuf, (unsigned char *)in, inlen); 94 if (outlen < 0) { 95 CTerror(CT_R_BASE64_DECODE_ERROR); 96 goto err; 97 } 98 99 /* 100 * Subtract padding bytes from |outlen|. 101 * Any more than 2 is malformed. 102 */ 103 i = 0; 104 while (in[--inlen] == '=') { 105 --outlen; 106 if (++i > 2) 107 goto err; 108 } 109 110 *out = outbuf; 111 return outlen; 112 err: 113 free(outbuf); 114 return -1; 115} 116 117SCT * 118SCT_new_from_base64(unsigned char version, const char *logid_base64, 119 ct_log_entry_type_t entry_type, uint64_t timestamp, 120 const char *extensions_base64, const char *signature_base64) 121{ 122 SCT *sct = SCT_new(); 123 unsigned char *dec = NULL; 124 const unsigned char* p = NULL; 125 int declen; 126 127 if (sct == NULL) { 128 CTerror(ERR_R_MALLOC_FAILURE); 129 return NULL; 130 } 131 132 /* 133 * RFC6962 section 4.1 says we "MUST NOT expect this to be 0", but we 134 * can only construct SCT versions that have been defined. 135 */ 136 if (!SCT_set_version(sct, version)) { 137 CTerror(CT_R_SCT_UNSUPPORTED_VERSION); 138 goto err; 139 } 140 141 declen = ct_base64_decode(logid_base64, &dec); 142 if (declen < 0) { 143 CTerror(X509_R_BASE64_DECODE_ERROR); 144 goto err; 145 } 146 if (!SCT_set0_log_id(sct, dec, declen)) 147 goto err; 148 dec = NULL; 149 150 declen = ct_base64_decode(extensions_base64, &dec); 151 if (declen < 0) { 152 CTerror(X509_R_BASE64_DECODE_ERROR); 153 goto err; 154 } 155 SCT_set0_extensions(sct, dec, declen); 156 dec = NULL; 157 158 declen = ct_base64_decode(signature_base64, &dec); 159 if (declen < 0) { 160 CTerror(X509_R_BASE64_DECODE_ERROR); 161 goto err; 162 } 163 164 p = dec; 165 if (o2i_SCT_signature(sct, &p, declen) <= 0) 166 goto err; 167 free(dec); 168 dec = NULL; 169 170 SCT_set_timestamp(sct, timestamp); 171 172 if (!SCT_set_log_entry_type(sct, entry_type)) 173 goto err; 174 175 return sct; 176 177 err: 178 free(dec); 179 SCT_free(sct); 180 return NULL; 181} 182 183/* 184 * Allocate, build and returns a new |ct_log| from input |pkey_base64| 185 * It returns 1 on success, 186 * 0 on decoding failure, or invalid parameter if any 187 * -1 on internal (malloc) failure 188 */ 189int 190CTLOG_new_from_base64(CTLOG **ct_log, const char *pkey_base64, const char *name) 191{ 192 unsigned char *pkey_der = NULL; 193 int pkey_der_len; 194 const unsigned char *p; 195 EVP_PKEY *pkey = NULL; 196 197 if (ct_log == NULL) { 198 CTerror(ERR_R_PASSED_NULL_PARAMETER); 199 return 0; 200 } 201 202 pkey_der_len = ct_base64_decode(pkey_base64, &pkey_der); 203 if (pkey_der_len < 0) { 204 CTerror(CT_R_LOG_CONF_INVALID_KEY); 205 return 0; 206 } 207 208 p = pkey_der; 209 pkey = d2i_PUBKEY(NULL, &p, pkey_der_len); 210 free(pkey_der); 211 if (pkey == NULL) { 212 CTerror(CT_R_LOG_CONF_INVALID_KEY); 213 return 0; 214 } 215 216 *ct_log = CTLOG_new(pkey, name); 217 if (*ct_log == NULL) { 218 EVP_PKEY_free(pkey); 219 return 0; 220 } 221 222 return 1; 223} 224