1 /* $OpenBSD: tls_conninfo.c,v 1.16 2017/08/27 01:39:26 beck Exp $ */ 2 /* 3 * Copyright (c) 2015 Joel Sing <jsing@openbsd.org> 4 * Copyright (c) 2015 Bob Beck <beck@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <stdio.h> 20 21 #include <openssl/x509.h> 22 23 #include <tls.h> 24 #include "tls_internal.h" 25 26 int ASN1_time_tm_clamp_notafter(struct tm *tm); 27 28 int 29 tls_hex_string(const unsigned char *in, size_t inlen, char **out, 30 size_t *outlen) 31 { 32 static const char hex[] = "0123456789abcdef"; 33 size_t i, len; 34 char *p; 35 36 if (outlen != NULL) 37 *outlen = 0; 38 39 if (inlen >= SIZE_MAX) 40 return (-1); 41 if ((*out = reallocarray(NULL, inlen + 1, 2)) == NULL) 42 return (-1); 43 44 p = *out; 45 len = 0; 46 for (i = 0; i < inlen; i++) { 47 p[len++] = hex[(in[i] >> 4) & 0x0f]; 48 p[len++] = hex[in[i] & 0x0f]; 49 } 50 p[len++] = 0; 51 52 if (outlen != NULL) 53 *outlen = len; 54 55 return (0); 56 } 57 58 static int 59 tls_get_peer_cert_hash(struct tls *ctx, char **hash) 60 { 61 *hash = NULL; 62 if (ctx->ssl_peer_cert == NULL) 63 return (0); 64 65 if (tls_cert_hash(ctx->ssl_peer_cert, hash) == -1) { 66 tls_set_errorx(ctx, "unable to compute peer certificate hash - out of memory"); 67 *hash = NULL; 68 return -1; 69 } 70 return 0; 71 } 72 73 static int 74 tls_get_peer_cert_issuer(struct tls *ctx, char **issuer) 75 { 76 X509_NAME *name = NULL; 77 78 *issuer = NULL; 79 if (ctx->ssl_peer_cert == NULL) 80 return (-1); 81 if ((name = X509_get_issuer_name(ctx->ssl_peer_cert)) == NULL) 82 return (-1); 83 *issuer = X509_NAME_oneline(name, 0, 0); 84 if (*issuer == NULL) 85 return (-1); 86 return (0); 87 } 88 89 static int 90 tls_get_peer_cert_subject(struct tls *ctx, char **subject) 91 { 92 X509_NAME *name = NULL; 93 94 *subject = NULL; 95 if (ctx->ssl_peer_cert == NULL) 96 return (-1); 97 if ((name = X509_get_subject_name(ctx->ssl_peer_cert)) == NULL) 98 return (-1); 99 *subject = X509_NAME_oneline(name, 0, 0); 100 if (*subject == NULL) 101 return (-1); 102 return (0); 103 } 104 105 static int 106 tls_get_peer_cert_times(struct tls *ctx, time_t *notbefore, 107 time_t *notafter) 108 { 109 struct tm before_tm, after_tm; 110 ASN1_TIME *before, *after; 111 112 if (ctx->ssl_peer_cert == NULL) 113 return (-1); 114 115 memset(&before_tm, 0, sizeof(before_tm)); 116 memset(&after_tm, 0, sizeof(after_tm)); 117 118 if ((before = X509_get_notBefore(ctx->ssl_peer_cert)) == NULL) 119 goto err; 120 if ((after = X509_get_notAfter(ctx->ssl_peer_cert)) == NULL) 121 goto err; 122 if (ASN1_time_parse(before->data, before->length, &before_tm, 0) == -1) 123 goto err; 124 if (ASN1_time_parse(after->data, after->length, &after_tm, 0) == -1) 125 goto err; 126 if (!ASN1_time_tm_clamp_notafter(&after_tm)) 127 goto err; 128 if ((*notbefore = timegm(&before_tm)) == -1) 129 goto err; 130 if ((*notafter = timegm(&after_tm)) == -1) 131 goto err; 132 133 return (0); 134 135 err: 136 return (-1); 137 } 138 139 static int 140 tls_get_peer_cert_info(struct tls *ctx) 141 { 142 if (ctx->ssl_peer_cert == NULL) 143 return (0); 144 145 if (tls_get_peer_cert_hash(ctx, &ctx->conninfo->hash) == -1) 146 goto err; 147 if (tls_get_peer_cert_subject(ctx, &ctx->conninfo->subject) == -1) 148 goto err; 149 if (tls_get_peer_cert_issuer(ctx, &ctx->conninfo->issuer) == -1) 150 goto err; 151 if (tls_get_peer_cert_times(ctx, &ctx->conninfo->notbefore, 152 &ctx->conninfo->notafter) == -1) 153 goto err; 154 155 return (0); 156 157 err: 158 return (-1); 159 } 160 161 static int 162 tls_conninfo_alpn_proto(struct tls *ctx) 163 { 164 const unsigned char *p; 165 unsigned int len; 166 167 free(ctx->conninfo->alpn); 168 ctx->conninfo->alpn = NULL; 169 170 SSL_get0_alpn_selected(ctx->ssl_conn, &p, &len); 171 if (len > 0) { 172 if ((ctx->conninfo->alpn = malloc(len + 1)) == NULL) 173 return (-1); 174 memcpy(ctx->conninfo->alpn, p, len); 175 ctx->conninfo->alpn[len] = '\0'; 176 } 177 178 return (0); 179 } 180 181 static int 182 tls_conninfo_cert_pem(struct tls *ctx) 183 { 184 int i, rv = -1; 185 BIO *membio = NULL; 186 BUF_MEM *bptr = NULL; 187 188 if (ctx->conninfo == NULL) 189 goto err; 190 if (ctx->ssl_peer_cert == NULL) 191 return 0; 192 if ((membio = BIO_new(BIO_s_mem()))== NULL) 193 goto err; 194 195 /* 196 * We have to write the peer cert out separately, because 197 * the certificate chain may or may not contain it. 198 */ 199 if (!PEM_write_bio_X509(membio, ctx->ssl_peer_cert)) 200 goto err; 201 for (i = 0; i < sk_X509_num(ctx->ssl_peer_chain); i++) { 202 X509 *chaincert = sk_X509_value(ctx->ssl_peer_chain, i); 203 if (chaincert != ctx->ssl_peer_cert && 204 !PEM_write_bio_X509(membio, chaincert)) 205 goto err; 206 } 207 208 BIO_get_mem_ptr(membio, &bptr); 209 free(ctx->conninfo->peer_cert); 210 ctx->conninfo->peer_cert_len = 0; 211 if ((ctx->conninfo->peer_cert = malloc(bptr->length)) == NULL) 212 goto err; 213 ctx->conninfo->peer_cert_len = bptr->length; 214 memcpy(ctx->conninfo->peer_cert, bptr->data, 215 ctx->conninfo->peer_cert_len); 216 217 /* BIO_free() will kill BUF_MEM - because we have not set BIO_NOCLOSE */ 218 rv = 0; 219 err: 220 BIO_free(membio); 221 return rv; 222 } 223 224 int 225 tls_conninfo_populate(struct tls *ctx) 226 { 227 const char *tmp; 228 229 tls_conninfo_free(ctx->conninfo); 230 231 if ((ctx->conninfo = calloc(1, sizeof(struct tls_conninfo))) == NULL) { 232 tls_set_errorx(ctx, "out of memory"); 233 goto err; 234 } 235 236 if (tls_conninfo_alpn_proto(ctx) == -1) 237 goto err; 238 239 if ((tmp = SSL_get_cipher(ctx->ssl_conn)) == NULL) 240 goto err; 241 ctx->conninfo->cipher = strdup(tmp); 242 if (ctx->conninfo->cipher == NULL) 243 goto err; 244 245 if (ctx->servername != NULL) { 246 if ((ctx->conninfo->servername = 247 strdup(ctx->servername)) == NULL) 248 goto err; 249 } 250 251 if ((tmp = SSL_get_version(ctx->ssl_conn)) == NULL) 252 goto err; 253 ctx->conninfo->version = strdup(tmp); 254 if (ctx->conninfo->version == NULL) 255 goto err; 256 257 if (tls_get_peer_cert_info(ctx) == -1) 258 goto err; 259 260 if (tls_conninfo_cert_pem(ctx) == -1) 261 goto err; 262 263 return (0); 264 265 err: 266 tls_conninfo_free(ctx->conninfo); 267 ctx->conninfo = NULL; 268 269 return (-1); 270 } 271 272 void 273 tls_conninfo_free(struct tls_conninfo *conninfo) 274 { 275 if (conninfo == NULL) 276 return; 277 278 free(conninfo->alpn); 279 conninfo->alpn = NULL; 280 free(conninfo->cipher); 281 conninfo->cipher = NULL; 282 free(conninfo->servername); 283 conninfo->servername = NULL; 284 free(conninfo->version); 285 conninfo->version = NULL; 286 287 free(conninfo->hash); 288 conninfo->hash = NULL; 289 free(conninfo->issuer); 290 conninfo->issuer = NULL; 291 free(conninfo->subject); 292 conninfo->subject = NULL; 293 294 free(conninfo->peer_cert); 295 conninfo->peer_cert = NULL; 296 conninfo->peer_cert_len = 0; 297 298 free(conninfo); 299 } 300 301 const char * 302 tls_conn_alpn_selected(struct tls *ctx) 303 { 304 if (ctx->conninfo == NULL) 305 return (NULL); 306 return (ctx->conninfo->alpn); 307 } 308 309 const char * 310 tls_conn_cipher(struct tls *ctx) 311 { 312 if (ctx->conninfo == NULL) 313 return (NULL); 314 return (ctx->conninfo->cipher); 315 } 316 317 const char * 318 tls_conn_servername(struct tls *ctx) 319 { 320 if (ctx->conninfo == NULL) 321 return (NULL); 322 return (ctx->conninfo->servername); 323 } 324 325 const char * 326 tls_conn_version(struct tls *ctx) 327 { 328 if (ctx->conninfo == NULL) 329 return (NULL); 330 return (ctx->conninfo->version); 331 } 332 333