ssl-bozo.c revision 1.24
1 /* $NetBSD: ssl-bozo.c,v 1.24 2018/11/20 01:06:46 mrg Exp $ */ 2 3 /* $eterna: ssl-bozo.c,v 1.15 2011/11/18 09:21:15 mrg Exp $ */ 4 5 /* 6 * Copyright (c) 1997-2018 Matthew R. Green 7 * 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 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer and 16 * dedication in the documentation and/or other materials provided 17 * with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 */ 32 33 /* this code implements SSL and backend IO for bozohttpd */ 34 35 #include <stdarg.h> 36 #include <stdio.h> 37 #include <string.h> 38 #include <syslog.h> 39 #include <unistd.h> 40 41 #include "bozohttpd.h" 42 43 #ifndef NO_SSL_SUPPORT 44 45 #include <openssl/ssl.h> 46 #include <openssl/err.h> 47 48 #ifndef USE_ARG 49 #define USE_ARG(x) /*LINTED*/(void)&(x) 50 #endif 51 52 #ifndef BOZO_SSL_CIPHERS 53 #define BOZO_SSL_CIPHERS \ 54 "AES256-GCM-SHA384:AES256-SHA256:AES256-SHA:" \ 55 "AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:" \ 56 "AES:" \ 57 "-SHA:" \ 58 "!aNULL:!eNULL:" \ 59 "!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:" \ 60 "!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:" \ 61 "!KRB5-DES-CBC3-SHA" 62 #endif 63 64 #ifndef BOZO_SSL_OPTIONS 65 #define BOZO_SSL_OPTIONS \ 66 ((long)(SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1)) 67 #endif 68 69 /* this structure encapsulates the ssl info */ 70 71 /* this structure encapsulates the ssl info */ 72 typedef struct sslinfo_t { 73 SSL_CTX *ssl_context; 74 const SSL_METHOD *ssl_method; 75 SSL *bozossl; 76 char *certificate_file; 77 char *privatekey_file; 78 char *ciphers; 79 } sslinfo_t; 80 81 /* 82 * bozo_clear_ssl_queue: print the contents of the SSL error queue 83 */ 84 static void 85 bozo_clear_ssl_queue(bozohttpd_t *httpd) 86 { 87 unsigned long sslcode = ERR_get_error(); 88 89 do { 90 static const char sslfmt[] = "SSL Error: %s:%s:%s"; 91 92 if (httpd->logstderr || isatty(STDERR_FILENO)) { 93 fprintf(stderr, sslfmt, 94 ERR_lib_error_string(sslcode), 95 ERR_func_error_string(sslcode), 96 ERR_reason_error_string(sslcode)); 97 } else { 98 syslog(LOG_ERR, sslfmt, 99 ERR_lib_error_string(sslcode), 100 ERR_func_error_string(sslcode), 101 ERR_reason_error_string(sslcode)); 102 } 103 } while (0 != (sslcode = ERR_get_error())); 104 } 105 106 /* 107 * bozo_ssl_warn works just like bozowarn, plus the SSL error queue 108 */ 109 BOZO_PRINTFLIKE(2, 3) static void 110 bozo_ssl_warn(bozohttpd_t *httpd, const char *fmt, ...) 111 { 112 va_list ap; 113 114 va_start(ap, fmt); 115 if (httpd->logstderr || isatty(STDERR_FILENO)) { 116 vfprintf(stderr, fmt, ap); 117 fputs("\n", stderr); 118 } else 119 vsyslog(LOG_ERR, fmt, ap); 120 va_end(ap); 121 122 bozo_clear_ssl_queue(httpd); 123 } 124 125 126 /* 127 * bozo_ssl_err works just like bozoerr, plus the SSL error queue 128 */ 129 BOZO_PRINTFLIKE(3, 4) BOZO_DEAD static void 130 bozo_ssl_err(bozohttpd_t *httpd, int code, const char *fmt, ...) 131 { 132 va_list ap; 133 134 va_start(ap, fmt); 135 if (httpd->logstderr || isatty(STDERR_FILENO)) { 136 vfprintf(stderr, fmt, ap); 137 fputs("\n", stderr); 138 } else 139 vsyslog(LOG_ERR, fmt, ap); 140 va_end(ap); 141 142 bozo_clear_ssl_queue(httpd); 143 exit(code); 144 } 145 146 /* 147 * bozo_check_error_queue: print warnings if the error isn't expected 148 */ 149 static void 150 bozo_check_error_queue(bozohttpd_t *httpd, const char *tag, int ret) 151 { 152 if (ret > 0) 153 return; 154 155 const sslinfo_t *sslinfo = httpd->sslinfo; 156 const int sslerr = SSL_get_error(sslinfo->bozossl, ret); 157 158 if (sslerr != SSL_ERROR_ZERO_RETURN && 159 sslerr != SSL_ERROR_SYSCALL && 160 sslerr != SSL_ERROR_NONE) 161 bozo_ssl_warn(httpd, "%s: SSL_ERROR %d", tag, sslerr); 162 } 163 164 static BOZO_PRINTFLIKE(2, 0) int 165 bozo_ssl_printf(bozohttpd_t *httpd, const char * fmt, va_list ap) 166 { 167 char *buf; 168 int nbytes; 169 170 if ((nbytes = vasprintf(&buf, fmt, ap)) != -1) { 171 const sslinfo_t *sslinfo = httpd->sslinfo; 172 int ret = SSL_write(sslinfo->bozossl, buf, nbytes); 173 bozo_check_error_queue(httpd, "write", ret); 174 } 175 176 free(buf); 177 178 return nbytes; 179 } 180 181 static ssize_t 182 bozo_ssl_read(bozohttpd_t *httpd, int fd, void *buf, size_t nbytes) 183 { 184 const sslinfo_t *sslinfo = httpd->sslinfo; 185 int ret; 186 187 USE_ARG(fd); 188 ret = SSL_read(sslinfo->bozossl, buf, (int)nbytes); 189 bozo_check_error_queue(httpd, "read", ret); 190 191 return (ssize_t)ret; 192 } 193 194 static ssize_t 195 bozo_ssl_write(bozohttpd_t *httpd, int fd, const void *buf, size_t nbytes) 196 { 197 const sslinfo_t *sslinfo = httpd->sslinfo; 198 int ret; 199 200 USE_ARG(fd); 201 ret = SSL_write(sslinfo->bozossl, buf, (int)nbytes); 202 bozo_check_error_queue(httpd, "write", ret); 203 204 return (ssize_t)ret; 205 } 206 207 void 208 bozo_ssl_init(bozohttpd_t *httpd) 209 { 210 sslinfo_t *sslinfo = httpd->sslinfo; 211 long options; 212 213 if (sslinfo == NULL || !sslinfo->certificate_file) 214 return; 215 SSL_library_init(); 216 SSL_load_error_strings(); 217 218 sslinfo->ssl_method = SSLv23_server_method(); 219 sslinfo->ssl_context = SSL_CTX_new(sslinfo->ssl_method); 220 221 if (NULL == sslinfo->ssl_context) 222 bozo_ssl_err(httpd, EXIT_FAILURE, 223 "SSL context creation failed"); 224 225 options = SSL_CTX_set_options(sslinfo->ssl_context, 226 BOZO_SSL_OPTIONS); 227 if ((options & BOZO_SSL_OPTIONS) != BOZO_SSL_OPTIONS) 228 bozo_ssl_err(httpd, EXIT_FAILURE, 229 "Error setting ssl options requested %#lx, got %#lx", 230 BOZO_SSL_OPTIONS, options); 231 232 if (!SSL_CTX_set_cipher_list(sslinfo->ssl_context, 233 sslinfo->ciphers ? sslinfo->ciphers : BOZO_SSL_CIPHERS)) 234 bozo_ssl_err(httpd, EXIT_FAILURE, 235 "Error setting cipher list '%s'", sslinfo->ciphers); 236 237 if (1 != SSL_CTX_use_certificate_chain_file(sslinfo->ssl_context, 238 sslinfo->certificate_file)) 239 bozo_ssl_err(httpd, EXIT_FAILURE, 240 "Unable to use certificate file '%s'", 241 sslinfo->certificate_file); 242 243 if (1 != SSL_CTX_use_PrivateKey_file(sslinfo->ssl_context, 244 sslinfo->privatekey_file, SSL_FILETYPE_PEM)) 245 bozo_ssl_err(httpd, EXIT_FAILURE, 246 "Unable to use private key file '%s'", 247 sslinfo->privatekey_file); 248 249 /* check consistency of key vs certificate */ 250 if (!SSL_CTX_check_private_key(sslinfo->ssl_context)) 251 bozo_ssl_err(httpd, EXIT_FAILURE, 252 "Check private key failed"); 253 } 254 255 /* 256 * returns non-zero for failure 257 */ 258 int 259 bozo_ssl_accept(bozohttpd_t *httpd) 260 { 261 sslinfo_t *sslinfo = httpd->sslinfo; 262 263 if (sslinfo == NULL || !sslinfo->ssl_context) 264 return 0; 265 266 sslinfo->bozossl = SSL_new(sslinfo->ssl_context); 267 if (sslinfo->bozossl == NULL) 268 bozoerr(httpd, 1, "SSL_new failed"); 269 270 SSL_set_rfd(sslinfo->bozossl, 0); 271 SSL_set_wfd(sslinfo->bozossl, 1); 272 273 const int ret = SSL_accept(sslinfo->bozossl); 274 bozo_check_error_queue(httpd, "accept", ret); 275 276 return ret != 1; 277 } 278 279 void 280 bozo_ssl_destroy(bozohttpd_t *httpd) 281 { 282 const sslinfo_t *sslinfo = httpd->sslinfo; 283 284 if (sslinfo && sslinfo->bozossl) 285 SSL_free(sslinfo->bozossl); 286 } 287 288 static sslinfo_t * 289 bozo_get_sslinfo(bozohttpd_t *httpd) 290 { 291 sslinfo_t *sslinfo; 292 if (httpd->sslinfo) 293 return httpd->sslinfo; 294 sslinfo = bozomalloc(httpd, sizeof(*sslinfo)); 295 if (sslinfo == NULL) 296 bozoerr(httpd, 1, "sslinfo allocation failed"); 297 memset(sslinfo, 0, sizeof(*sslinfo)); 298 return httpd->sslinfo = sslinfo; 299 } 300 301 void 302 bozo_ssl_set_opts(bozohttpd_t *httpd, const char *cert, const char *priv) 303 { 304 sslinfo_t *sslinfo = bozo_get_sslinfo(httpd); 305 306 sslinfo->certificate_file = bozostrdup(httpd, NULL, cert); 307 sslinfo->privatekey_file = bozostrdup(httpd, NULL, priv); 308 debug((httpd, DEBUG_NORMAL, "using cert/priv files: %s & %s", 309 sslinfo->certificate_file, 310 sslinfo->privatekey_file)); 311 if (!httpd->bindport) 312 httpd->bindport = bozostrdup(httpd, NULL, "https"); 313 } 314 315 void 316 bozo_ssl_set_ciphers(bozohttpd_t *httpd, const char *ciphers) 317 { 318 sslinfo_t *sslinfo = bozo_get_sslinfo(httpd); 319 320 sslinfo->ciphers = bozostrdup(httpd, NULL, ciphers); 321 debug((httpd, DEBUG_NORMAL, "using ciphers: %s", sslinfo->ciphers)); 322 } 323 324 #endif /* NO_SSL_SUPPORT */ 325 326 int 327 bozo_printf(bozohttpd_t *httpd, const char *fmt, ...) 328 { 329 va_list args; 330 int cc; 331 332 va_start(args, fmt); 333 #ifndef NO_SSL_SUPPORT 334 if (httpd->sslinfo) 335 cc = bozo_ssl_printf(httpd, fmt, args); 336 else 337 #endif 338 cc = vprintf(fmt, args); 339 va_end(args); 340 return cc; 341 } 342 343 ssize_t 344 bozo_read(bozohttpd_t *httpd, int fd, void *buf, size_t len) 345 { 346 #ifndef NO_SSL_SUPPORT 347 if (httpd->sslinfo) 348 return bozo_ssl_read(httpd, fd, buf, len); 349 #endif 350 return read(fd, buf, len); 351 } 352 353 ssize_t 354 bozo_write(bozohttpd_t *httpd, int fd, const void *buf, size_t len) 355 { 356 #ifndef NO_SSL_SUPPORT 357 if (httpd->sslinfo) 358 return bozo_ssl_write(httpd, fd, buf, len); 359 #endif 360 return write(fd, buf, len); 361 } 362 363 int 364 bozo_flush(bozohttpd_t *httpd, FILE *fp) 365 { 366 #ifndef NO_SSL_SUPPORT 367 if (httpd->sslinfo) 368 return 0; 369 #endif 370 return fflush(fp); 371 } 372
Indexes created Tue Sep 30 20:09:53 GMT 2025