1 /* $OpenBSD: ct_b64.c,v 1.6 2021/12/20 17:19:19 jsing 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 "bytestring.h" 68 #include "ct_local.h" 69 70 /* 71 * Decodes the base64 string |in| into |out|. 72 * A new string will be malloc'd and assigned to |out|. This will be owned by 73 * the caller. Do not provide a pre-allocated string in |out|. 74 */ 75 static int 76 ct_base64_decode(const char *in, unsigned char **out) 77 { 78 size_t inlen = strlen(in); 79 int outlen, i; 80 unsigned char *outbuf = NULL; 81 82 if (inlen == 0) { 83 *out = NULL; 84 return 0; 85 } 86 87 outlen = (inlen / 4) * 3; 88 outbuf = malloc(outlen); 89 if (outbuf == NULL) { 90 CTerror(ERR_R_MALLOC_FAILURE); 91 goto err; 92 } 93 94 outlen = EVP_DecodeBlock(outbuf, (unsigned char *)in, inlen); 95 if (outlen < 0) { 96 CTerror(CT_R_BASE64_DECODE_ERROR); 97 goto err; 98 } 99 100 /* 101 * Subtract padding bytes from |outlen|. 102 * Any more than 2 is malformed. 103 */ 104 i = 0; 105 while (in[--inlen] == '=') { 106 --outlen; 107 if (++i > 2) 108 goto err; 109 } 110 111 *out = outbuf; 112 return outlen; 113 err: 114 free(outbuf); 115 return -1; 116 } 117 118 SCT * 119 SCT_new_from_base64(unsigned char version, const char *logid_base64, 120 ct_log_entry_type_t entry_type, uint64_t timestamp, 121 const char *extensions_base64, const char *signature_base64) 122 { 123 unsigned char *dec = NULL; 124 int declen; 125 SCT *sct; 126 CBS cbs; 127 128 if ((sct = SCT_new()) == NULL) { 129 CTerror(ERR_R_MALLOC_FAILURE); 130 return NULL; 131 } 132 133 /* 134 * RFC6962 section 4.1 says we "MUST NOT expect this to be 0", but we 135 * can only construct SCT versions that have been defined. 136 */ 137 if (!SCT_set_version(sct, version)) { 138 CTerror(CT_R_SCT_UNSUPPORTED_VERSION); 139 goto err; 140 } 141 142 declen = ct_base64_decode(logid_base64, &dec); 143 if (declen < 0) { 144 CTerror(X509_R_BASE64_DECODE_ERROR); 145 goto err; 146 } 147 if (!SCT_set0_log_id(sct, dec, declen)) 148 goto err; 149 dec = NULL; 150 151 declen = ct_base64_decode(extensions_base64, &dec); 152 if (declen < 0) { 153 CTerror(X509_R_BASE64_DECODE_ERROR); 154 goto err; 155 } 156 SCT_set0_extensions(sct, dec, declen); 157 dec = NULL; 158 159 declen = ct_base64_decode(signature_base64, &dec); 160 if (declen < 0) { 161 CTerror(X509_R_BASE64_DECODE_ERROR); 162 goto err; 163 } 164 165 CBS_init(&cbs, dec, declen); 166 if (!o2i_SCT_signature(sct, &cbs)) 167 goto err; 168 free(dec); 169 dec = NULL; 170 171 SCT_set_timestamp(sct, timestamp); 172 173 if (!SCT_set_log_entry_type(sct, entry_type)) 174 goto err; 175 176 return sct; 177 178 err: 179 free(dec); 180 SCT_free(sct); 181 return NULL; 182 } 183 184 /* 185 * Allocate, build and returns a new |ct_log| from input |pkey_base64| 186 * It returns 1 on success, 187 * 0 on decoding failure, or invalid parameter if any 188 * -1 on internal (malloc) failure 189 */ 190 int 191 CTLOG_new_from_base64(CTLOG **ct_log, const char *pkey_base64, const char *name) 192 { 193 unsigned char *pkey_der = NULL; 194 int pkey_der_len; 195 const unsigned char *p; 196 EVP_PKEY *pkey = NULL; 197 198 if (ct_log == NULL) { 199 CTerror(ERR_R_PASSED_NULL_PARAMETER); 200 return 0; 201 } 202 203 pkey_der_len = ct_base64_decode(pkey_base64, &pkey_der); 204 if (pkey_der_len < 0) { 205 CTerror(CT_R_LOG_CONF_INVALID_KEY); 206 return 0; 207 } 208 209 p = pkey_der; 210 pkey = d2i_PUBKEY(NULL, &p, pkey_der_len); 211 free(pkey_der); 212 if (pkey == NULL) { 213 CTerror(CT_R_LOG_CONF_INVALID_KEY); 214 return 0; 215 } 216 217 *ct_log = CTLOG_new(pkey, name); 218 if (*ct_log == NULL) { 219 EVP_PKEY_free(pkey); 220 return 0; 221 } 222 223 return 1; 224 } 225