ssl-bozo.c revision 1.17
1 /* $NetBSD: ssl-bozo.c,v 1.17 2014/07/17 06:14:46 mrg Exp $ */ 2 3 /* $eterna: ssl-bozo.c,v 1.15 2011/11/18 09:21:15 mrg Exp $ */ 4 5 /* 6 * Copyright (c) 1997-2014 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 for bozohttpd */ 34 35 #include <stdarg.h> 36 #include <stdio.h> 37 #include <syslog.h> 38 #include <unistd.h> 39 40 #include "bozohttpd.h" 41 42 #ifndef NO_SSL_SUPPORT 43 44 #include <openssl/ssl.h> 45 #include <openssl/err.h> 46 47 #ifndef USE_ARG 48 #define USE_ARG(x) /*LINTED*/(void)&(x) 49 #endif 50 51 /* this structure encapsulates the ssl info */ 52 typedef struct sslinfo_t { 53 SSL_CTX *ssl_context; 54 const SSL_METHOD *ssl_method; 55 SSL *bozossl; 56 char *certificate_file; 57 char *privatekey_file; 58 } sslinfo_t; 59 60 /* 61 * bozo_ssl_err 62 * 63 * bozo_ssl_err works just like bozo_err except in addition to printing 64 * the error provided by the caller at the point of error it pops and 65 * prints all errors from the SSL error queue. 66 */ 67 BOZO_PRINTFLIKE(3, 4) BOZO_DEAD static void 68 bozo_ssl_err(bozohttpd_t *httpd, int code, const char *fmt, ...) 69 { 70 va_list ap; 71 72 va_start(ap, fmt); 73 if (httpd->logstderr || isatty(STDERR_FILENO)) { 74 vfprintf(stderr, fmt, ap); 75 fputs("\n", stderr); 76 } else 77 vsyslog(LOG_ERR, fmt, ap); 78 va_end(ap); 79 80 unsigned int sslcode = ERR_get_error(); 81 do { 82 static const char sslfmt[] = "SSL Error: %s:%s:%s"; 83 84 if (httpd->logstderr || isatty(STDERR_FILENO)) { 85 fprintf(stderr, sslfmt, 86 ERR_lib_error_string(sslcode), 87 ERR_func_error_string(sslcode), 88 ERR_reason_error_string(sslcode)); 89 } else { 90 syslog(LOG_ERR, sslfmt, 91 ERR_lib_error_string(sslcode), 92 ERR_func_error_string(sslcode), 93 ERR_reason_error_string(sslcode)); 94 } 95 } while (0 != (sslcode = ERR_get_error())); 96 exit(code); 97 } 98 99 static BOZO_PRINTFLIKE(2, 0) int 100 bozo_ssl_printf(bozohttpd_t *httpd, const char * fmt, va_list ap) 101 { 102 const sslinfo_t *sslinfo = httpd->sslinfo; 103 char *buf; 104 int nbytes; 105 106 /* XXX we need more elegant/proper handling of SSL_write return */ 107 if ((nbytes = vasprintf(&buf, fmt, ap)) != -1) 108 SSL_write(sslinfo->bozossl, buf, nbytes); 109 110 free(buf); 111 112 return nbytes; 113 } 114 115 static ssize_t 116 bozo_ssl_read(bozohttpd_t *httpd, int fd, void *buf, size_t nbytes) 117 { 118 const sslinfo_t *sslinfo = httpd->sslinfo; 119 ssize_t rbytes; 120 121 USE_ARG(fd); 122 /* XXX we need elegant/proper handling of SSL_read return */ 123 rbytes = (ssize_t)SSL_read(sslinfo->bozossl, buf, (int)nbytes); 124 if (rbytes < 1) { 125 if (SSL_get_error(sslinfo->bozossl, rbytes) == 126 SSL_ERROR_WANT_READ) 127 bozo_warn(httpd, "SSL_ERROR_WANT_READ"); 128 else 129 bozo_warn(httpd, "SSL_ERROR OTHER"); 130 } 131 132 return rbytes; 133 } 134 135 static ssize_t 136 bozo_ssl_write(bozohttpd_t *httpd, int fd, const void *buf, size_t nbytes) 137 { 138 const sslinfo_t *sslinfo = httpd->sslinfo; 139 ssize_t wbytes; 140 141 USE_ARG(fd); 142 /* XXX we need elegant/proper handling of SSL_write return */ 143 wbytes = (ssize_t)SSL_write(sslinfo->bozossl, buf, (int)nbytes); 144 145 return wbytes; 146 } 147 148 static int 149 bozo_ssl_flush(bozohttpd_t *httpd, FILE *fp) 150 { 151 USE_ARG(httpd); 152 USE_ARG(fp); 153 /* nothing to see here, move right along */ 154 return 0; 155 } 156 157 void 158 bozo_ssl_init(bozohttpd_t *httpd) 159 { 160 sslinfo_t *sslinfo = httpd->sslinfo; 161 162 if (sslinfo == NULL || !sslinfo->certificate_file) 163 return; 164 SSL_library_init(); 165 SSL_load_error_strings(); 166 167 sslinfo->ssl_method = SSLv23_server_method(); 168 sslinfo->ssl_context = SSL_CTX_new(sslinfo->ssl_method); 169 170 /* XXX we need to learn how to check the SSL stack for more info */ 171 if (NULL == sslinfo->ssl_context) 172 bozo_ssl_err(httpd, EXIT_FAILURE, 173 "SSL context creation failed"); 174 175 if (1 != SSL_CTX_use_certificate_chain_file(sslinfo->ssl_context, 176 sslinfo->certificate_file)) 177 bozo_ssl_err(httpd, EXIT_FAILURE, 178 "Unable to use certificate file '%s'", 179 sslinfo->certificate_file); 180 181 if (1 != SSL_CTX_use_PrivateKey_file(sslinfo->ssl_context, 182 sslinfo->privatekey_file, SSL_FILETYPE_PEM)) 183 bozo_ssl_err(httpd, EXIT_FAILURE, 184 "Unable to use private key file '%s'", 185 sslinfo->privatekey_file); 186 187 /* check consistency of key vs certificate */ 188 if (!SSL_CTX_check_private_key(sslinfo->ssl_context)) 189 bozo_ssl_err(httpd, EXIT_FAILURE, 190 "Check private key failed"); 191 } 192 193 void 194 bozo_ssl_accept(bozohttpd_t *httpd) 195 { 196 sslinfo_t *sslinfo = httpd->sslinfo; 197 198 if (sslinfo != NULL && sslinfo->ssl_context) { 199 sslinfo->bozossl = SSL_new(sslinfo->ssl_context); 200 SSL_set_rfd(sslinfo->bozossl, 0); 201 SSL_set_wfd(sslinfo->bozossl, 1); 202 SSL_accept(sslinfo->bozossl); 203 } 204 } 205 206 void 207 bozo_ssl_destroy(bozohttpd_t *httpd) 208 { 209 const sslinfo_t *sslinfo = httpd->sslinfo; 210 211 if (sslinfo && sslinfo->bozossl) 212 SSL_free(sslinfo->bozossl); 213 } 214 215 void 216 bozo_ssl_set_opts(bozohttpd_t *httpd, const char *cert, const char *priv) 217 { 218 sslinfo_t *sslinfo = httpd->sslinfo; 219 220 if (sslinfo == NULL) { 221 sslinfo = bozomalloc(httpd, sizeof(*sslinfo)); 222 if (sslinfo == NULL) { 223 bozo_err(httpd, 1, "sslinfo allocation failed"); 224 } 225 httpd->sslinfo = sslinfo; 226 } 227 sslinfo->certificate_file = strdup(cert); 228 sslinfo->privatekey_file = strdup(priv); 229 debug((httpd, DEBUG_NORMAL, "using cert/priv files: %s & %s", 230 sslinfo->certificate_file, 231 sslinfo->privatekey_file)); 232 if (!httpd->bindport) 233 httpd->bindport = strdup("https"); 234 } 235 236 #endif /* NO_SSL_SUPPORT */ 237 238 int 239 bozo_printf(bozohttpd_t *httpd, const char *fmt, ...) 240 { 241 va_list args; 242 int cc; 243 244 va_start(args, fmt); 245 #ifndef NO_SSL_SUPPORT 246 if (httpd->sslinfo) 247 cc = bozo_ssl_printf(httpd, fmt, args); 248 else 249 #endif 250 cc = vprintf(fmt, args); 251 va_end(args); 252 return cc; 253 } 254 255 ssize_t 256 bozo_read(bozohttpd_t *httpd, int fd, void *buf, size_t len) 257 { 258 #ifndef NO_SSL_SUPPORT 259 if (httpd->sslinfo) 260 return bozo_ssl_read(httpd, fd, buf, len); 261 #endif 262 return read(fd, buf, len); 263 } 264 265 ssize_t 266 bozo_write(bozohttpd_t *httpd, int fd, const void *buf, size_t len) 267 { 268 #ifndef NO_SSL_SUPPORT 269 if (httpd->sslinfo) 270 return bozo_ssl_write(httpd, fd, buf, len); 271 #endif 272 return write(fd, buf, len); 273 } 274 275 int 276 bozo_flush(bozohttpd_t *httpd, FILE *fp) 277 { 278 #ifndef NO_SSL_SUPPORT 279 if (httpd->sslinfo) 280 return bozo_ssl_flush(httpd, fp); 281 #endif 282 return fflush(fp); 283 } 284
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