/* $NetBSD: connect.c,v 1.4.8.1 2023/08/11 13:39:55 martin Exp $ */ /* * Copyright (c) 1997-2005 Kungliga Tekniska Högskolan * (Royal Institute of Technology, Stockholm, Sweden). * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 3. Neither the name of the Institute nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "kdc_locl.h" /* * a tuple describing on what to listen */ struct port_desc{ int family; int type; int port; }; /* the current ones */ static struct port_desc *ports; static size_t num_ports; static pid_t bonjour_pid = -1; /* * add `family, port, protocol' to the list with duplicate suppresion. */ static void add_port(krb5_context context, int family, int port, const char *protocol) { int type; size_t i; if(strcmp(protocol, "udp") == 0) type = SOCK_DGRAM; else if(strcmp(protocol, "tcp") == 0) type = SOCK_STREAM; else return; for(i = 0; i < num_ports; i++){ if(ports[i].type == type && ports[i].port == port && ports[i].family == family) return; } ports = realloc(ports, (num_ports + 1) * sizeof(*ports)); if (ports == NULL) krb5_err (context, 1, errno, "realloc"); ports[num_ports].family = family; ports[num_ports].type = type; ports[num_ports].port = port; num_ports++; } /* * add a triple but with service -> port lookup * (this prints warnings for stuff that does not exist) */ static void add_port_service(krb5_context context, int family, const char *service, int port, const char *protocol) { port = krb5_getportbyname (context, service, protocol, port); add_port (context, family, port, protocol); } /* * add the port with service -> port lookup or string -> number * (no warning is printed) */ static void add_port_string (krb5_context context, int family, const char *str, const char *protocol) { struct servent *sp; int port; sp = roken_getservbyname (str, protocol); if (sp != NULL) { port = sp->s_port; } else { char *end; port = htons(strtol(str, &end, 0)); if (end == str) return; } add_port (context, family, port, protocol); } /* * add the standard collection of ports for `family' */ static void add_standard_ports (krb5_context context, krb5_kdc_configuration *config, int family) { add_port_service(context, family, "kerberos", 88, "udp"); add_port_service(context, family, "kerberos", 88, "tcp"); add_port_service(context, family, "kerberos-sec", 88, "udp"); add_port_service(context, family, "kerberos-sec", 88, "tcp"); if(enable_http) add_port_service(context, family, "http", 80, "tcp"); if(config->enable_kx509) { add_port_service(context, family, "kca_service", 9878, "udp"); add_port_service(context, family, "kca_service", 9878, "tcp"); } } /* * parse the set of space-delimited ports in `str' and add them. * "+" => all the standard ones * otherwise it's port|service[/protocol] */ static void parse_ports(krb5_context context, krb5_kdc_configuration *config, const char *str) { char *pos = NULL; char *p; char *str_copy = strdup (str); p = strtok_r(str_copy, " \t", &pos); while(p != NULL) { if(strcmp(p, "+") == 0) { #ifdef HAVE_IPV6 add_standard_ports(context, config, AF_INET6); #endif add_standard_ports(context, config, AF_INET); } else { char *q = strchr(p, '/'); if(q){ *q++ = 0; #ifdef HAVE_IPV6 add_port_string(context, AF_INET6, p, q); #endif add_port_string(context, AF_INET, p, q); }else { #ifdef HAVE_IPV6 add_port_string(context, AF_INET6, p, "udp"); add_port_string(context, AF_INET6, p, "tcp"); #endif add_port_string(context, AF_INET, p, "udp"); add_port_string(context, AF_INET, p, "tcp"); } } p = strtok_r(NULL, " \t", &pos); } free (str_copy); } /* * every socket we listen on */ struct descr { krb5_socket_t s; int type; int port; unsigned char *buf; size_t size; size_t len; time_t timeout; struct sockaddr_storage __ss; struct sockaddr *sa; socklen_t sock_len; char addr_string[128]; }; static void init_descr(struct descr *d) { memset(d, 0, sizeof(*d)); d->sa = (struct sockaddr *)&d->__ss; d->s = rk_INVALID_SOCKET; } /* * re-initialize all `n' ->sa in `d'. */ static void reinit_descrs (struct descr *d, int n) { int i; for (i = 0; i < n; ++i) d[i].sa = (struct sockaddr *)&d[i].__ss; } /* * Create the socket (family, type, port) in `d' */ static void init_socket(krb5_context context, krb5_kdc_configuration *config, struct descr *d, krb5_address *a, int family, int type, int port) { krb5_error_code ret; struct sockaddr_storage __ss; struct sockaddr *sa = (struct sockaddr *)&__ss; krb5_socklen_t sa_size = sizeof(__ss); init_descr (d); ret = krb5_addr2sockaddr (context, a, sa, &sa_size, port); if (ret) { krb5_warn(context, ret, "krb5_addr2sockaddr"); rk_closesocket(d->s); d->s = rk_INVALID_SOCKET; return; } if (sa->sa_family != family) return; d->s = socket(family, type, 0); if(rk_IS_BAD_SOCKET(d->s)){ krb5_warn(context, errno, "socket(%d, %d, 0)", family, type); d->s = rk_INVALID_SOCKET; return; } rk_cloexec(d->s); #if defined(HAVE_SETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_REUSEADDR) { int one = 1; setsockopt(d->s, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one)); } #endif d->type = type; d->port = port; socket_set_nonblocking(d->s, 1); if(rk_IS_SOCKET_ERROR(bind(d->s, sa, sa_size))){ char a_str[256]; size_t len; krb5_print_address (a, a_str, sizeof(a_str), &len); krb5_warn(context, errno, "bind %s/%d", a_str, ntohs(port)); rk_closesocket(d->s); d->s = rk_INVALID_SOCKET; return; } if(type == SOCK_STREAM && rk_IS_SOCKET_ERROR(listen(d->s, SOMAXCONN))){ char a_str[256]; size_t len; krb5_print_address (a, a_str, sizeof(a_str), &len); krb5_warn(context, errno, "listen %s/%d", a_str, ntohs(port)); rk_closesocket(d->s); d->s = rk_INVALID_SOCKET; return; } } /* * Allocate descriptors for all the sockets that we should listen on * and return the number of them. */ static int init_sockets(krb5_context context, krb5_kdc_configuration *config, struct descr **desc) { krb5_error_code ret; size_t i, j; struct descr *d; int num = 0; krb5_addresses addresses; if (explicit_addresses.len) { addresses = explicit_addresses; } else { ret = krb5_get_all_server_addrs (context, &addresses); if (ret) krb5_err (context, 1, ret, "krb5_get_all_server_addrs"); } parse_ports(context, config, port_str); d = malloc(addresses.len * num_ports * sizeof(*d)); if (d == NULL) krb5_errx(context, 1, "malloc(%lu) failed", (unsigned long)num_ports * sizeof(*d)); for (i = 0; i < num_ports; i++){ for (j = 0; j < addresses.len; ++j) { init_socket(context, config, &d[num], &addresses.val[j], ports[i].family, ports[i].type, ports[i].port); if(d[num].s != rk_INVALID_SOCKET){ char a_str[80]; size_t len; krb5_print_address (&addresses.val[j], a_str, sizeof(a_str), &len); kdc_log(context, config, 5, "listening on %s port %u/%s", a_str, ntohs(ports[i].port), (ports[i].type == SOCK_STREAM) ? "tcp" : "udp"); /* XXX */ num++; } } } krb5_free_addresses (context, &addresses); d = realloc(d, num * sizeof(*d)); if (d == NULL && num != 0) krb5_errx(context, 1, "realloc(%lu) failed", (unsigned long)num * sizeof(*d)); reinit_descrs (d, num); *desc = d; return num; } /* * */ static const char * descr_type(struct descr *d) { if (d->type == SOCK_DGRAM) return "udp"; else if (d->type == SOCK_STREAM) return "tcp"; return "unknown"; } static void addr_to_string(krb5_context context, struct sockaddr *addr, size_t addr_len, char *str, size_t len) { krb5_address a; if(krb5_sockaddr2address(context, addr, &a) == 0) { if(krb5_print_address(&a, str, len, &len) == 0) { krb5_free_address(context, &a); return; } krb5_free_address(context, &a); } snprintf(str, len, "", addr->sa_family); } /* * */ static void send_reply(krb5_context context, krb5_kdc_configuration *config, krb5_boolean prependlength, struct descr *d, krb5_data *reply) { kdc_log(context, config, 5, "sending %lu bytes to %s", (unsigned long)reply->length, d->addr_string); if(prependlength){ unsigned char l[4]; l[0] = (reply->length >> 24) & 0xff; l[1] = (reply->length >> 16) & 0xff; l[2] = (reply->length >> 8) & 0xff; l[3] = reply->length & 0xff; if(rk_IS_SOCKET_ERROR(sendto(d->s, l, sizeof(l), 0, d->sa, d->sock_len))) { kdc_log (context, config, 0, "sendto(%s): %s", d->addr_string, strerror(rk_SOCK_ERRNO)); return; } } if(rk_IS_SOCKET_ERROR(sendto(d->s, reply->data, reply->length, 0, d->sa, d->sock_len))) { kdc_log (context, config, 0, "sendto(%s): %s", d->addr_string, strerror(rk_SOCK_ERRNO)); return; } } /* * Handle the request in `buf, len' to socket `d' */ static void do_request(krb5_context context, krb5_kdc_configuration *config, void *buf, size_t len, krb5_boolean prependlength, struct descr *d) { krb5_error_code ret; krb5_data reply; int datagram_reply = (d->type == SOCK_DGRAM); krb5_kdc_update_time(NULL); krb5_data_zero(&reply); ret = krb5_kdc_process_request(context, config, buf, len, &reply, &prependlength, d->addr_string, d->sa, datagram_reply); if(request_log) krb5_kdc_save_request(context, request_log, buf, len, &reply, d->sa); if(reply.length){ send_reply(context, config, prependlength, d, &reply); krb5_data_free(&reply); } if(ret) kdc_log(context, config, 0, "Failed processing %lu byte request from %s", (unsigned long)len, d->addr_string); } /* * Handle incoming data to the UDP socket in `d' */ static void handle_udp(krb5_context context, krb5_kdc_configuration *config, struct descr *d) { unsigned char *buf; ssize_t n; buf = malloc(max_request_udp); if (buf == NULL){ kdc_log(context, config, 0, "Failed to allocate %lu bytes", (unsigned long)max_request_udp); return; } d->sock_len = sizeof(d->__ss); n = recvfrom(d->s, buf, max_request_udp, 0, d->sa, &d->sock_len); if (rk_IS_SOCKET_ERROR(n)) { if (rk_SOCK_ERRNO != EAGAIN && rk_SOCK_ERRNO != EINTR) krb5_warn(context, rk_SOCK_ERRNO, "recvfrom"); } else { addr_to_string (context, d->sa, d->sock_len, d->addr_string, sizeof(d->addr_string)); if ((size_t)n == max_request_udp) { krb5_data data; krb5_warn(context, errno, "recvfrom: truncated packet from %s, asking for TCP", d->addr_string); krb5_mk_error(context, KRB5KRB_ERR_RESPONSE_TOO_BIG, NULL, NULL, NULL, NULL, NULL, NULL, &data); send_reply(context, config, FALSE, d, &data); krb5_data_free(&data); } else { do_request(context, config, buf, n, FALSE, d); } } free (buf); } static void clear_descr(struct descr *d) { if(d->buf) memset(d->buf, 0, d->size); d->len = 0; if(d->s != rk_INVALID_SOCKET) rk_closesocket(d->s); d->s = rk_INVALID_SOCKET; } /* remove HTTP %-quoting from buf */ static int de_http(char *buf) { unsigned char *p, *q; unsigned int x; for (p = q = (unsigned char *)buf; *p; p++, q++) { if (*p == '%') { if (!(isxdigit(p[1]) && isxdigit(p[2]))) return -1; if (sscanf((char *)p + 1, "%2x", &x) != 1) return -1; *q = x; p += 2; } else { *q = *p; } } *q = '\0'; return 0; } #define TCP_TIMEOUT 4 /* * accept a new TCP connection on `d[parent]' and store it in `d[child]' */ static void add_new_tcp (krb5_context context, krb5_kdc_configuration *config, struct descr *d, int parent, int child) { krb5_socket_t s; if (child == -1) return; d[child].sock_len = sizeof(d[child].__ss); s = accept(d[parent].s, d[child].sa, &d[child].sock_len); if(rk_IS_BAD_SOCKET(s)) { if (rk_SOCK_ERRNO != EAGAIN && rk_SOCK_ERRNO != EINTR) krb5_warn(context, rk_SOCK_ERRNO, "accept"); return; } #ifdef FD_SETSIZE if (s >= FD_SETSIZE) { krb5_warnx(context, "socket FD too large"); rk_closesocket (s); return; } #endif d[child].s = s; d[child].timeout = time(NULL) + TCP_TIMEOUT; d[child].type = SOCK_STREAM; addr_to_string (context, d[child].sa, d[child].sock_len, d[child].addr_string, sizeof(d[child].addr_string)); } /* * Grow `d' to handle at least `n'. * Return != 0 if fails */ static int grow_descr (krb5_context context, krb5_kdc_configuration *config, struct descr *d, size_t n) { if (d->size - d->len < n) { unsigned char *tmp; size_t grow; grow = max(1024, d->len + n); if (d->size + grow > max_request_tcp) { kdc_log(context, config, 0, "Request exceeds max request size (%lu bytes).", (unsigned long)d->size + grow); clear_descr(d); return -1; } tmp = realloc (d->buf, d->size + grow); if (tmp == NULL) { kdc_log(context, config, 0, "Failed to re-allocate %lu bytes.", (unsigned long)d->size + grow); clear_descr(d); return -1; } d->size += grow; d->buf = tmp; } return 0; } /* * Try to handle the TCP data at `d->buf, d->len'. * Return -1 if failed, 0 if succesful, and 1 if data is complete. */ static int handle_vanilla_tcp (krb5_context context, krb5_kdc_configuration *config, struct descr *d) { krb5_storage *sp; uint32_t len; sp = krb5_storage_from_mem(d->buf, d->len); if (sp == NULL) { kdc_log (context, config, 0, "krb5_storage_from_mem failed"); return -1; } krb5_ret_uint32(sp, &len); krb5_storage_free(sp); if(d->len - 4 >= len) { memmove(d->buf, d->buf + 4, d->len - 4); d->len -= 4; return 1; } return 0; } /* * Try to handle the TCP/HTTP data at `d->buf, d->len'. * Return -1 if failed, 0 if succesful, and 1 if data is complete. */ static int handle_http_tcp (krb5_context context, krb5_kdc_configuration *config, struct descr *d) { char *s, *p, *t; void *data; char *proto; int len; s = (char *)d->buf; /* If its a multi line query, truncate off the first line */ p = strstr(s, "\r\n"); if (p) *p = 0; p = NULL; t = strtok_r(s, " \t", &p); if (t == NULL) { kdc_log(context, config, 0, "Missing HTTP operand (GET) request from %s", d->addr_string); return -1; } t = strtok_r(NULL, " \t", &p); if(t == NULL) { kdc_log(context, config, 0, "Missing HTTP GET data in request from %s", d->addr_string); return -1; } data = malloc(strlen(t)); if (data == NULL) { kdc_log(context, config, 0, "Failed to allocate %lu bytes", (unsigned long)strlen(t)); return -1; } if(*t == '/') t++; if(de_http(t) != 0) { kdc_log(context, config, 0, "Malformed HTTP request from %s", d->addr_string); kdc_log(context, config, 5, "HTTP request: %s", t); free(data); return -1; } proto = strtok_r(NULL, " \t", &p); if (proto == NULL) { kdc_log(context, config, 0, "Malformed HTTP request from %s", d->addr_string); free(data); return -1; } len = rk_base64_decode(t, data); if(len <= 0){ const char *msg = " 404 Not found\r\n" "Server: Heimdal/" VERSION "\r\n" "Cache-Control: no-cache\r\n" "Pragma: no-cache\r\n" "Content-type: text/html\r\n" "Content-transfer-encoding: 8bit\r\n\r\n" "404 Not found\r\n" "

404 Not found

\r\n" "That page doesn't exist, maybe you are looking for " "Heimdal?\r\n"; kdc_log(context, config, 0, "HTTP request from %s is non KDC request", d->addr_string); kdc_log(context, config, 5, "HTTP request: %s", t); free(data); if (rk_IS_SOCKET_ERROR(send(d->s, proto, strlen(proto), 0))) { kdc_log(context, config, 0, "HTTP write failed: %s: %s", d->addr_string, strerror(rk_SOCK_ERRNO)); return -1; } if (rk_IS_SOCKET_ERROR(send(d->s, msg, strlen(msg), 0))) { kdc_log(context, config, 0, "HTTP write failed: %s: %s", d->addr_string, strerror(rk_SOCK_ERRNO)); return -1; } return -1; } { const char *msg = " 200 OK\r\n" "Server: Heimdal/" VERSION "\r\n" "Cache-Control: no-cache\r\n" "Pragma: no-cache\r\n" "Content-type: application/octet-stream\r\n" "Content-transfer-encoding: binary\r\n\r\n"; if (rk_IS_SOCKET_ERROR(send(d->s, proto, strlen(proto), 0))) { free(data); kdc_log(context, config, 0, "HTTP write failed: %s: %s", d->addr_string, strerror(rk_SOCK_ERRNO)); return -1; } if (rk_IS_SOCKET_ERROR(send(d->s, msg, strlen(msg), 0))) { free(data); kdc_log(context, config, 0, "HTTP write failed: %s: %s", d->addr_string, strerror(rk_SOCK_ERRNO)); return -1; } } if ((size_t)len > d->len) len = d->len; memcpy(d->buf, data, len); d->len = len; free(data); return 1; } /* * Handle incoming data to the TCP socket in `d[index]' */ static void handle_tcp(krb5_context context, krb5_kdc_configuration *config, struct descr *d, int idx, int min_free) { unsigned char buf[1024]; int n; int ret = 0; if (d[idx].timeout == 0) { add_new_tcp (context, config, d, idx, min_free); return; } n = recvfrom(d[idx].s, buf, sizeof(buf), 0, NULL, NULL); if(rk_IS_SOCKET_ERROR(n)){ krb5_warn(context, rk_SOCK_ERRNO, "recvfrom failed from %s to %s/%d", d[idx].addr_string, descr_type(d + idx), ntohs(d[idx].port)); return; } else if (n == 0) { krb5_warnx(context, "connection closed before end of data after %lu " "bytes from %s to %s/%d", (unsigned long)d[idx].len, d[idx].addr_string, descr_type(d + idx), ntohs(d[idx].port)); clear_descr (d + idx); return; } if (grow_descr (context, config, &d[idx], n)) return; memcpy(d[idx].buf + d[idx].len, buf, n); d[idx].len += n; if(d[idx].len > 4 && d[idx].buf[0] == 0) { ret = handle_vanilla_tcp (context, config, &d[idx]); } else if(enable_http && d[idx].len >= 4 && strncmp((char *)d[idx].buf, "GET ", 4) == 0 && strncmp((char *)d[idx].buf + d[idx].len - 4, "\r\n\r\n", 4) == 0) { /* remove the trailing \r\n\r\n so the string is NUL terminated */ d[idx].buf[d[idx].len - 4] = '\0'; ret = handle_http_tcp (context, config, &d[idx]); if (ret < 0) clear_descr (d + idx); } else if (d[idx].len > 4) { kdc_log (context, config, 0, "TCP data of strange type from %s to %s/%d", d[idx].addr_string, descr_type(d + idx), ntohs(d[idx].port)); if (d[idx].buf[0] & 0x80) { krb5_data reply; kdc_log (context, config, 0, "TCP extension not supported"); ret = krb5_mk_error(context, KRB5KRB_ERR_FIELD_TOOLONG, NULL, NULL, NULL, NULL, NULL, NULL, &reply); if (ret == 0) { send_reply(context, config, TRUE, d + idx, &reply); krb5_data_free(&reply); } } clear_descr(d + idx); return; } if (ret < 0) return; else if (ret == 1) { do_request(context, config, d[idx].buf, d[idx].len, TRUE, &d[idx]); clear_descr(d + idx); } } #ifdef HAVE_FORK static void handle_islive(int fd) { char buf; int ret; ret = read(fd, &buf, 1); if (ret != 1) exit_flag = -1; } #endif krb5_boolean realloc_descrs(struct descr **d, unsigned int *ndescr) { struct descr *tmp; size_t i; tmp = realloc(*d, (*ndescr + 4) * sizeof(**d)); if(tmp == NULL) return FALSE; *d = tmp; reinit_descrs (*d, *ndescr); memset(*d + *ndescr, 0, 4 * sizeof(**d)); for(i = *ndescr; i < *ndescr + 4; i++) init_descr (*d + i); *ndescr += 4; return TRUE; } int next_min_free(krb5_context context, struct descr **d, unsigned int *ndescr) { size_t i; int min_free; for(i = 0; i < *ndescr; i++) { int s = (*d + i)->s; if(rk_IS_BAD_SOCKET(s)) return i; } min_free = *ndescr; if(!realloc_descrs(d, ndescr)) { min_free = -1; krb5_warnx(context, "No memory"); } return min_free; } static void loop(krb5_context context, krb5_kdc_configuration *config, struct descr *d, unsigned int ndescr, int islive) { while (exit_flag == 0) { struct timeval tmout; fd_set fds; int min_free = -1; int max_fd = 0; size_t i; FD_ZERO(&fds); if (islive > -1) { FD_SET(islive, &fds); max_fd = islive; } for (i = 0; i < ndescr; i++) { if (!rk_IS_BAD_SOCKET(d[i].s)) { if (d[i].type == SOCK_STREAM && d[i].timeout && d[i].timeout < time(NULL)) { kdc_log(context, config, 1, "TCP-connection from %s expired after %lu bytes", d[i].addr_string, (unsigned long)d[i].len); clear_descr(&d[i]); continue; } #ifndef NO_LIMIT_FD_SETSIZE if (max_fd < d[i].s) max_fd = d[i].s; #ifdef FD_SETSIZE if (max_fd >= FD_SETSIZE) krb5_errx(context, 1, "fd too large"); #endif #endif FD_SET(d[i].s, &fds); } } tmout.tv_sec = TCP_TIMEOUT; tmout.tv_usec = 0; switch(select(max_fd + 1, &fds, 0, 0, &tmout)){ case 0: break; case -1: if (errno != EINTR) krb5_warn(context, rk_SOCK_ERRNO, "select"); break; default: #ifdef HAVE_FORK if (islive > -1 && FD_ISSET(islive, &fds)) handle_islive(islive); #endif for (i = 0; i < ndescr; i++) if (!rk_IS_BAD_SOCKET(d[i].s) && FD_ISSET(d[i].s, &fds)) { min_free = next_min_free(context, &d, &ndescr); if (d[i].type == SOCK_DGRAM) handle_udp(context, config, &d[i]); else if (d[i].type == SOCK_STREAM) handle_tcp(context, config, d, i, min_free); } } } switch (exit_flag) { case -1: kdc_log(context, config, 0, "KDC worker process exiting because KDC master exited."); break; #ifdef SIGXCPU case SIGXCPU: kdc_log(context, config, 0, "CPU time limit exceeded"); break; #endif case SIGINT: case SIGTERM: kdc_log(context, config, 0, "Terminated"); break; default: kdc_log(context, config, 0, "Unexpected exit reason: %d", exit_flag); break; } } #ifdef __APPLE__ static void bonjour_kid(krb5_context context, krb5_kdc_configuration *config, const char *argv0, int *islive) { char buf; if (do_bonjour > 0) { bonjour_announce(context, config); while (read(0, &buf, 1) == 1) continue; _exit(0); } if ((bonjour_pid = fork()) != 0) return; close(islive[0]); if (dup2(islive[1], 0) == -1) err(1, "failed to announce with bonjour (dup)"); if (islive[1] != 0) close(islive[1]); execlp(argv0, "kdc", "--bonjour", NULL); err(1, "failed to announce with bonjour (exec)"); } #endif #ifdef HAVE_FORK static void kill_kids(pid_t *pids, int max_kids, int sig) { int i; for (i=0; i < max_kids; i++) if (pids[i] > 0) kill(sig, pids[i]); if (bonjour_pid > 0) kill(sig, bonjour_pid); } static int reap_kid(krb5_context context, krb5_kdc_configuration *config, pid_t *pids, int max_kids, int options) { pid_t pid; char *what; int status; int i = 0; /* quiet warnings */ pid = waitpid(-1, &status, options); if (pid < 1) return 0; if (pid != bonjour_pid) { for (i=0; i < max_kids; i++) { if (pids[i] == pid) break; } if (i == max_kids) { /* XXXrcd: this should not happen, have to do something, though */ return 0; } } if (pid == bonjour_pid) what = "bonjour"; else what = "worker"; if (WIFEXITED(status)) kdc_log(context, config, 0, "KDC reaped %s process: %d, exit status: %d", what, (int)pid, WEXITSTATUS(status)); else if (WIFSIGNALED(status)) kdc_log(context, config, 0, "KDC reaped %s process: %d, term signal %d%s", what, (int)pid, WTERMSIG(status), WCOREDUMP(status) ? " (core dumped)" : ""); else kdc_log(context, config, 0, "KDC reaped %s process: %d", what, (int)pid); if (pid == bonjour_pid) { bonjour_pid = (pid_t)-1; return 0; } else { pids[i] = (pid_t)0; return 1; } } static int reap_kids(krb5_context context, krb5_kdc_configuration *config, pid_t *pids, int max_kids) { int reaped = 0; for (;;) { if (reap_kid(context, config, pids, max_kids, WNOHANG) == 0) break; reaped++; } return reaped; } static void select_sleep(int microseconds) { struct timeval tv; tv.tv_sec = microseconds / 1000000; tv.tv_usec = microseconds % 1000000; select(0, NULL, NULL, NULL, &tv); } #endif void start_kdc(krb5_context context, krb5_kdc_configuration *config, const char *argv0) { struct timeval tv1; struct timeval tv2; struct descr *d; unsigned int ndescr; pid_t pid = -1; #ifdef HAVE_FORK pid_t *pids; int max_kdcs = config->num_kdc_processes; int num_kdcs = 0; int i; int islive[2]; #endif #ifdef __APPLE__ if (do_bonjour > 0) bonjour_kid(context, config, argv0, NULL); #endif #ifdef HAVE_FORK #ifdef _SC_NPROCESSORS_ONLN if (max_kdcs < 1) max_kdcs = sysconf(_SC_NPROCESSORS_ONLN); #endif if (max_kdcs < 1) max_kdcs = 1; pids = calloc(max_kdcs, sizeof(*pids)); if (!pids) krb5_err(context, 1, errno, "malloc"); /* * We open a socketpair of which we hand one end to each of our kids. * When we exit, for whatever reason, the children will notice an EOF * on their end and be able to cleanly exit. */ if (socketpair(PF_UNIX, SOCK_STREAM, 0, islive) == -1) krb5_errx(context, 1, "socketpair"); socket_set_nonblocking(islive[1], 1); #endif ndescr = init_sockets(context, config, &d); if(ndescr <= 0) krb5_errx(context, 1, "No sockets!"); #ifdef HAVE_FORK # ifdef __APPLE__ if (do_bonjour < 0) bonjour_kid(context, config, argv0, islive); # endif kdc_log(context, config, 0, "KDC started master process pid=%d", getpid()); #else kdc_log(context, config, 0, "KDC started pid=%d", getpid()); #endif roken_detach_finish(NULL, daemon_child); tv1.tv_sec = 0; tv1.tv_usec = 0; #ifdef HAVE_FORK if (!testing_flag) { /* Note that we might never execute the body of this loop */ while (exit_flag == 0) { /* Slow down the creation of KDCs... */ gettimeofday(&tv2, NULL); if (tv1.tv_sec == tv2.tv_sec && tv2.tv_usec - tv1.tv_usec < 25000) { #if 0 /* XXXrcd: should print a message... */ kdc_log(context, config, 0, "Spawning KDCs too quickly, " "pausing for 50ms"); #endif select_sleep(12500); continue; } if (num_kdcs >= max_kdcs) { num_kdcs -= reap_kid(context, config, pids, max_kdcs, 0); continue; } if (num_kdcs > 0) num_kdcs -= reap_kids(context, config, pids, max_kdcs); pid = fork(); switch (pid) { case 0: close(islive[0]); loop(context, config, d, ndescr, islive[1]); exit(0); case -1: /* XXXrcd: hmmm, do something useful?? */ kdc_log(context, config, 0, "KDC master process could not fork worker process"); sleep(10); break; default: for (i=0; i < max_kdcs; i++) { if (pids[i] < 1) { pids[i] = pid; break; } } kdc_log(context, config, 0, "KDC worker process started: %d", pid); num_kdcs++; gettimeofday(&tv1, NULL); break; } } /* Closing these sockets should cause the kids to die... */ close(islive[0]); close(islive[1]); /* Close our listener sockets before terminating workers */ for (i = 0; i < ndescr; ++i) clear_descr(&d[i]); gettimeofday(&tv1, NULL); tv2 = tv1; /* Reap every 10ms, terminate stragglers once a second, give up after 10 */ for (;;) { struct timeval tv3; num_kdcs -= reap_kids(context, config, pids, max_kdcs); if (num_kdcs == 0 && bonjour_pid <= 0) goto end; /* * Using select to sleep will fail with EINTR if we receive a * SIGCHLD. This is desirable. */ select_sleep(10000); gettimeofday(&tv3, NULL); if (tv3.tv_sec - tv1.tv_sec > 10 || (tv3.tv_sec - tv1.tv_sec == 10 && tv3.tv_usec >= tv1.tv_usec)) break; if (tv3.tv_sec - tv2.tv_sec > 1 || (tv3.tv_sec - tv2.tv_sec == 1 && tv3.tv_usec >= tv2.tv_usec)) { kill_kids(pids, max_kdcs, SIGTERM); tv2 = tv3; } } /* Kill stragglers and reap every 200ms, give up after 15s */ for (;;) { kill_kids(pids, max_kdcs, SIGKILL); num_kdcs -= reap_kids(context, config, pids, max_kdcs); if (num_kdcs == 0 && bonjour_pid <= 0) break; select_sleep(200000); gettimeofday(&tv2, NULL); if (tv2.tv_sec - tv1.tv_sec > 15 || (tv2.tv_sec - tv1.tv_sec == 15 && tv2.tv_usec >= tv1.tv_usec)) break; } end: kdc_log(context, config, 0, "KDC master process exiting", pid); free(pids); } else { loop(context, config, d, ndescr, -1); kdc_log(context, config, 0, "KDC exiting", pid); } #else loop(context, config, d, ndescr, -1); kdc_log(context, config, 0, "KDC exiting", pid); #endif }