1 /* 2 * Copyright (c) 2000 - 2001 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "kadmin_locl.h" 35 #ifdef HAVE_SYS_WAIT_H 36 #include <sys/wait.h> 37 #endif 38 39 RCSID("$Id: kadm_conn.c,v 1.13 2001/05/16 22:06:44 assar Exp $"); 40 41 struct kadm_port { 42 char *port; 43 unsigned short def_port; 44 struct kadm_port *next; 45 } *kadm_ports; 46 47 static void 48 add_kadm_port(krb5_context context, const char *service, unsigned int port) 49 { 50 struct kadm_port *p; 51 p = malloc(sizeof(*p)); 52 if(p == NULL) { 53 krb5_warnx(context, "failed to allocate %lu bytes\n", 54 (unsigned long)sizeof(*p)); 55 return; 56 } 57 58 p->port = strdup(service); 59 p->def_port = port; 60 61 p->next = kadm_ports; 62 kadm_ports = p; 63 } 64 65 static void 66 add_standard_ports (krb5_context context) 67 { 68 add_kadm_port(context, "kerberos-adm", 749); 69 #ifdef KRB4 70 add_kadm_port(context, "kerberos-master", 751); 71 #endif 72 } 73 74 /* 75 * parse the set of space-delimited ports in `str' and add them. 76 * "+" => all the standard ones 77 * otherwise it's port|service[/protocol] 78 */ 79 80 void 81 parse_ports(krb5_context context, const char *str) 82 { 83 char p[128]; 84 85 while(strsep_copy(&str, " \t", p, sizeof(p)) != -1) { 86 if(strcmp(p, "+") == 0) 87 add_standard_ports(context); 88 else 89 add_kadm_port(context, p, 0); 90 } 91 } 92 93 static pid_t pgrp; 94 sig_atomic_t term_flag, doing_useful_work; 95 96 static RETSIGTYPE 97 sigchld(int sig) 98 { 99 int status; 100 waitpid(-1, &status, 0); 101 SIGRETURN(0); 102 } 103 104 static RETSIGTYPE 105 terminate(int sig) 106 { 107 if(getpid() == pgrp) { 108 /* parent */ 109 term_flag = 1; 110 signal(sig, SIG_IGN); 111 killpg(pgrp, sig); 112 } else { 113 /* child */ 114 if(doing_useful_work) 115 term_flag = 1; 116 else 117 exit(0); 118 } 119 SIGRETURN(0); 120 } 121 122 static int 123 spawn_child(krb5_context context, int *socks, int num_socks, int this_sock) 124 { 125 int e, i; 126 struct sockaddr_storage __ss; 127 struct sockaddr *sa = (struct sockaddr *)&__ss; 128 socklen_t sa_size = sizeof(__ss); 129 int s; 130 pid_t pid; 131 krb5_address addr; 132 char buf[128]; 133 size_t buf_len; 134 135 s = accept(socks[this_sock], sa, &sa_size); 136 if(s < 0) { 137 krb5_warn(context, errno, "accept"); 138 return 1; 139 } 140 e = krb5_sockaddr2address(context, sa, &addr); 141 if(e) 142 krb5_warn(context, e, "krb5_sockaddr2address"); 143 else { 144 e = krb5_print_address (&addr, buf, sizeof(buf), 145 &buf_len); 146 if(e) 147 krb5_warn(context, e, "krb5_print_address"); 148 else 149 krb5_warnx(context, "connection from %s", buf); 150 krb5_free_address(context, &addr); 151 } 152 153 pid = fork(); 154 if(pid == 0) { 155 for(i = 0; i < num_socks; i++) 156 close(socks[i]); 157 dup2(s, STDIN_FILENO); 158 dup2(s, STDOUT_FILENO); 159 if(s != STDIN_FILENO && s != STDOUT_FILENO) 160 close(s); 161 return 0; 162 } else { 163 close(s); 164 } 165 return 1; 166 } 167 168 static int 169 wait_for_connection(krb5_context context, 170 int *socks, int num_socks) 171 { 172 int i, e; 173 fd_set orig_read_set, read_set; 174 int max_fd = -1; 175 176 FD_ZERO(&orig_read_set); 177 178 for(i = 0; i < num_socks; i++) { 179 if (socks[i] >= FD_SETSIZE) 180 errx (1, "fd too large"); 181 FD_SET(socks[i], &orig_read_set); 182 max_fd = max(max_fd, socks[i]); 183 } 184 185 pgrp = getpid(); 186 187 if(setpgid(0, pgrp) < 0) 188 err(1, "setpgid"); 189 190 signal(SIGTERM, terminate); 191 signal(SIGINT, terminate); 192 signal(SIGCHLD, sigchld); 193 194 while (term_flag == 0) { 195 read_set = orig_read_set; 196 e = select(max_fd + 1, &read_set, NULL, NULL, NULL); 197 if(e < 0) { 198 if(errno != EINTR) 199 krb5_warn(context, errno, "select"); 200 } else if(e == 0) 201 krb5_warnx(context, "select returned 0"); 202 else { 203 for(i = 0; i < num_socks; i++) { 204 if(FD_ISSET(socks[i], &read_set)) 205 if(spawn_child(context, socks, num_socks, i) == 0) 206 return 0; 207 } 208 } 209 } 210 signal(SIGCHLD, SIG_IGN); 211 while(1) { 212 int status; 213 pid_t pid; 214 pid = waitpid(-1, &status, 0); 215 if(pid == -1 && errno == ECHILD) 216 break; 217 } 218 exit(0); 219 } 220 221 222 int 223 start_server(krb5_context context) 224 { 225 int e; 226 struct kadm_port *p; 227 228 int *socks = NULL, *tmp; 229 int num_socks = 0; 230 int i; 231 232 for(p = kadm_ports; p; p = p->next) { 233 struct addrinfo hints, *ai, *ap; 234 char portstr[32]; 235 memset (&hints, 0, sizeof(hints)); 236 hints.ai_flags = AI_PASSIVE; 237 hints.ai_socktype = SOCK_STREAM; 238 239 e = getaddrinfo(NULL, p->port, &hints, &ai); 240 if(e) { 241 snprintf(portstr, sizeof(portstr), "%u", p->def_port); 242 e = getaddrinfo(NULL, portstr, &hints, &ai); 243 } 244 245 if(e) { 246 krb5_warn(context, krb5_eai_to_heim_errno(e, errno), 247 "%s", portstr); 248 continue; 249 } 250 i = 0; 251 for(ap = ai; ap; ap = ap->ai_next) 252 i++; 253 tmp = realloc(socks, (num_socks + i) * sizeof(*socks)); 254 if(tmp == NULL) { 255 krb5_warnx(context, "failed to reallocate %lu bytes", 256 (unsigned long)(num_socks + i) * sizeof(*socks)); 257 continue; 258 } 259 socks = tmp; 260 for(ap = ai; ap; ap = ap->ai_next) { 261 int one = 1; 262 int s = socket(ap->ai_family, ap->ai_socktype, ap->ai_protocol); 263 if(s < 0) { 264 krb5_warn(context, errno, "socket"); 265 continue; 266 } 267 #if defined(SO_REUSEADDR) && defined(HAVE_SETSOCKOPT) 268 if(setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void *)&one, 269 sizeof(one)) < 0) 270 krb5_warn(context, errno, "setsockopt"); 271 #endif 272 if (bind (s, ap->ai_addr, ap->ai_addrlen) < 0) { 273 krb5_warn(context, errno, "bind"); 274 close(s); 275 continue; 276 } 277 if (listen (s, SOMAXCONN) < 0) { 278 krb5_warn(context, errno, "listen"); 279 close(s); 280 continue; 281 } 282 socks[num_socks++] = s; 283 } 284 freeaddrinfo (ai); 285 } 286 if(num_socks == 0) 287 krb5_errx(context, 1, "no sockets to listen to - exiting"); 288 return wait_for_connection(context, socks, num_socks); 289 } 290