+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* lib/krb5/os/locate_kdc.c
*
- * Copyright 1990 by the Massachusetts Institute of Technology.
+ * Copyright 1990,2000,2001,2002,2003,2004,2006,2008 Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
- *
+ *
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
- * permission. M.I.T. makes no representations about the suitability of
+ * permission. Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
- *
+ *
*
* get socket addresses for KDC.
*/
+#include "fake-addrinfo.h"
+#include "k5-int.h"
+#include "os-proto.h"
+#include <stdio.h>
+#ifdef KRB5_DNS_LOOKUP
+#ifdef WSHELPER
+#include <wshelper.h>
+#else /* WSHELPER */
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+#include <resolv.h>
+#include <netdb.h>
+#endif /* WSHELPER */
+#ifndef T_SRV
+#define T_SRV 33
+#endif /* T_SRV */
-#include <krb5/krb5.h>
-#include <krb5/osconf.h>
+/* for old Unixes and friends ... */
+#ifndef MAXHOSTNAMELEN
+#define MAXHOSTNAMELEN 64
+#endif
-#include <krb5/ext-proto.h>
-#include <stdio.h>
-#include <krb5/los-proto.h>
+#define MAX_DNS_NAMELEN (15*(MAXHOSTNAMELEN + 1)+1)
-#include <sys/types.h>
-#include <sys/socket.h>
-#ifdef KRB5_USE_INET
-#include <netinet/in.h>
+#if KRB5_DNS_LOOKUP_KDC
+#define DEFAULT_LOOKUP_KDC 1
+#else
+#define DEFAULT_LOOKUP_KDC 0
#endif
-#include <netdb.h>
-#include "os-proto.h"
+#if KRB5_DNS_LOOKUP_REALM
+#define DEFAULT_LOOKUP_REALM 1
+#else
+#define DEFAULT_LOOKUP_REALM 0
+#endif
+
+static int
+maybe_use_dns (krb5_context context, const char *name, int defalt)
+{
+ krb5_error_code code;
+ char * value = NULL;
+ int use_dns = 0;
+
+ code = profile_get_string(context->profile, KRB5_CONF_LIBDEFAULTS,
+ name, 0, 0, &value);
+ if (value == 0 && code == 0)
+ code = profile_get_string(context->profile, KRB5_CONF_LIBDEFAULTS,
+ KRB5_CONF_DNS_FALLBACK, 0, 0, &value);
+ if (code)
+ return defalt;
+
+ if (value == 0)
+ return defalt;
+
+ use_dns = _krb5_conf_boolean(value);
+ profile_release_string(value);
+ return use_dns;
+}
+
+int
+_krb5_use_dns_kdc(krb5_context context)
+{
+ return maybe_use_dns (context, KRB5_CONF_DNS_LOOKUP_KDC, DEFAULT_LOOKUP_KDC);
+}
+
+int
+_krb5_use_dns_realm(krb5_context context)
+{
+ return maybe_use_dns (context, KRB5_CONF_DNS_LOOKUP_REALM, DEFAULT_LOOKUP_REALM);
+}
+
+#endif /* KRB5_DNS_LOOKUP */
+
+int
+krb5int_grow_addrlist (struct addrlist *lp, int nmore)
+{
+ size_t i;
+ size_t newspace = lp->space + nmore;
+ size_t newsize = newspace * sizeof (*lp->addrs);
+ void *newaddrs;
+
+ newaddrs = realloc (lp->addrs, newsize);
+ if (newaddrs == NULL)
+ return ENOMEM;
+ lp->addrs = newaddrs;
+ for (i = lp->space; i < newspace; i++) {
+ lp->addrs[i].ai = NULL;
+ lp->addrs[i].freefn = NULL;
+ lp->addrs[i].data = NULL;
+ }
+ lp->space = newspace;
+ return 0;
+}
+#define grow_list krb5int_grow_addrlist
+
+/* Free up everything pointed to by the addrlist structure, but don't
+ free the structure itself. */
+void
+krb5int_free_addrlist (struct addrlist *lp)
+{
+ size_t i;
+ for (i = 0; i < lp->naddrs; i++)
+ if (lp->addrs[i].freefn)
+ (lp->addrs[i].freefn)(lp->addrs[i].data);
+ free (lp->addrs);
+ lp->addrs = NULL;
+ lp->naddrs = lp->space = 0;
+}
+#define free_list krb5int_free_addrlist
+
+static int
+translate_ai_error (int err)
+{
+ switch (err) {
+ case 0:
+ return 0;
+ case EAI_BADFLAGS:
+ case EAI_FAMILY:
+ case EAI_SOCKTYPE:
+ case EAI_SERVICE:
+ /* All of these indicate bad inputs to getaddrinfo. */
+ return EINVAL;
+ case EAI_AGAIN:
+ /* Translate to standard errno code. */
+ return EAGAIN;
+ case EAI_MEMORY:
+ /* Translate to standard errno code. */
+ return ENOMEM;
+#ifdef EAI_ADDRFAMILY
+ case EAI_ADDRFAMILY:
+#endif
+#if defined(EAI_NODATA) && EAI_NODATA != EAI_NONAME
+ case EAI_NODATA:
+#endif
+ case EAI_NONAME:
+ /* Name not known or no address data, but no error. Do
+ nothing more. */
+ return 0;
+#ifdef EAI_OVERFLOW
+ case EAI_OVERFLOW:
+ /* An argument buffer overflowed. */
+ return EINVAL; /* XXX */
+#endif
+#ifdef EAI_SYSTEM
+ case EAI_SYSTEM:
+ /* System error, obviously. */
+ return errno;
+#endif
+ default:
+ /* An error code we haven't handled? */
+ return EINVAL;
+ }
+}
+
+#include <stdarg.h>
+static inline void
+Tprintf(const char *fmt, ...)
+{
+#ifdef TEST
+ va_list ap;
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+#endif
+}
+
+#if 0
+extern void krb5int_debug_fprint(const char *, ...);
+#define dprint krb5int_debug_fprint
+#define print_addrlist krb5int_print_addrlist
+extern void print_addrlist (const struct addrlist *a);
+#else
+static inline void dprint(const char *fmt, ...) { }
+static inline void print_addrlist(const struct addrlist *a) { }
+#endif
+
+static int
+add_addrinfo_to_list(struct addrlist *lp, struct addrinfo *a,
+ void (*freefn)(void *), void *data)
+{
+ int err;
+
+ dprint("\tadding %p=%A to %p (naddrs=%d space=%d)\n", a, a, lp,
+ lp->naddrs, lp->space);
+
+ if (lp->naddrs == lp->space) {
+ err = grow_list (lp, 1);
+ if (err) {
+ Tprintf ("grow_list failed %d\n", err);
+ return err;
+ }
+ }
+ Tprintf("setting element %d\n", lp->naddrs);
+ lp->addrs[lp->naddrs].ai = a;
+ lp->addrs[lp->naddrs].freefn = freefn;
+ lp->addrs[lp->naddrs].data = data;
+ lp->naddrs++;
+ Tprintf ("\tcount is now %lu: ", (unsigned long) lp->naddrs);
+ print_addrlist(lp);
+ Tprintf("\n");
+ return 0;
+}
+
+#define add_host_to_list krb5int_add_host_to_list
+
+static void
+call_freeaddrinfo(void *data)
+{
+ /* Strict interpretation of the C standard says we can't assume
+ that the ABI for f(void*) and f(struct foo *) will be
+ compatible. Use this stub just to be paranoid. */
+ freeaddrinfo(data);
+}
-#ifdef KRB5_USE_INET
-extern char *krb5_kdc_udp_portname;
-extern char *krb5_kdc_sec_udp_portname;
+int
+krb5int_add_host_to_list (struct addrlist *lp, const char *hostname,
+ int port, int secport,
+ int socktype, int family)
+{
+ struct addrinfo *addrs, *a, *anext, hint;
+ int err, result;
+ char portbuf[10], secportbuf[10];
+ void (*freefn)(void *);
+
+ Tprintf ("adding hostname %s, ports %d,%d, family %d, socktype %d\n",
+ hostname, ntohs (port), ntohs (secport),
+ family, socktype);
+
+ memset(&hint, 0, sizeof(hint));
+ hint.ai_family = family;
+ hint.ai_socktype = socktype;
+#ifdef AI_NUMERICSERV
+ hint.ai_flags = AI_NUMERICSERV;
#endif
+ result = snprintf(portbuf, sizeof(portbuf), "%d", ntohs(port));
+ if (SNPRINTF_OVERFLOW(result, sizeof(portbuf)))
+ /* XXX */
+ return EINVAL;
+ result = snprintf(secportbuf, sizeof(secportbuf), "%d", ntohs(secport));
+ if (SNPRINTF_OVERFLOW(result, sizeof(secportbuf)))
+ return EINVAL;
+ err = getaddrinfo (hostname, portbuf, &hint, &addrs);
+ if (err) {
+ Tprintf ("\tgetaddrinfo(\"%s\", \"%s\", ...)\n\treturns %d: %s\n",
+ hostname, portbuf, err, gai_strerror (err));
+ return translate_ai_error (err);
+ }
+ freefn = call_freeaddrinfo;
+ anext = 0;
+ for (a = addrs; a != 0 && err == 0; a = anext, freefn = 0) {
+ anext = a->ai_next;
+ err = add_addrinfo_to_list (lp, a, freefn, a);
+ }
+ if (err || secport == 0)
+ goto egress;
+ if (socktype == 0)
+ socktype = SOCK_DGRAM;
+ else if (socktype != SOCK_DGRAM)
+ goto egress;
+ hint.ai_family = AF_INET;
+ err = getaddrinfo (hostname, secportbuf, &hint, &addrs);
+ if (err) {
+ err = translate_ai_error (err);
+ goto egress;
+ }
+ freefn = call_freeaddrinfo;
+ for (a = addrs; a != 0 && err == 0; a = anext, freefn = 0) {
+ anext = a->ai_next;
+ err = add_addrinfo_to_list (lp, a, freefn, a);
+ }
+egress:
+ /* XXX Memory leaks possible here if add_addrinfo_to_list fails. */
+ return err;
+}
/*
* returns count of number of addresses found
+ * if master is non-NULL, it is filled in with the index of
+ * the master kdc
*/
-krb5_error_code
-krb5_locate_kdc(realm, addr_pp, naddrs)
- const krb5_data *realm;
- struct sockaddr **addr_pp;
- int *naddrs;
-{
- char **hostlist;
- int code;
- int i, j, out, count;
- struct sockaddr *addr_p;
- struct sockaddr_in *sin_p;
- struct hostent *hp;
- struct servent *sp;
-#ifdef KRB5_USE_INET
- u_short udpport = htons(KRB5_DEFAULT_PORT);
- u_short sec_udpport = htons(KRB5_DEFAULT_SEC_PORT);
-#endif
+static krb5_error_code
+krb5_locate_srv_conf_1(krb5_context context, const krb5_data *realm,
+ const char * name, struct addrlist *addrlist,
+ int get_masters, int socktype,
+ int udpport, int sec_udpport, int family)
+{
+ const char *realm_srv_names[4];
+ char **masterlist, **hostlist, *host, *port, *cp;
+ krb5_error_code code;
+ int i, j, count, ismaster;
+
+ Tprintf ("looking in krb5.conf for realm %s entry %s; ports %d,%d\n",
+ realm->data, name, ntohs (udpport), ntohs (sec_udpport));
+ if ((host = malloc(realm->length + 1)) == NULL)
+ return ENOMEM;
+
+ strncpy(host, realm->data, realm->length);
+ host[realm->length] = '\0';
hostlist = 0;
-
- if (code = krb5_get_krbhst (realm, &hostlist))
- return(code);
-
-#ifdef KRB5_USE_INET
- if (sp = getservbyname(krb5_kdc_udp_portname, "udp"))
- udpport = sp->s_port;
- if (krb5_kdc_sec_udp_portname)
- if (sp = getservbyname(krb5_kdc_sec_udp_portname, "udp")) {
-#ifdef KRB5_TRY_SECONDARY_PORT_FIRST
- sec_udpport = udpport;
- udpport = sp->s_port;
-#else
- sec_udpport = sp->s_port;
-#endif
- }
-#endif
+
+ masterlist = NULL;
+
+ realm_srv_names[0] = KRB5_CONF_REALMS;
+ realm_srv_names[1] = host;
+ realm_srv_names[2] = name;
+ realm_srv_names[3] = 0;
+
+ code = profile_get_values(context->profile, realm_srv_names, &hostlist);
+
+ if (code) {
+ Tprintf ("config file lookup failed: %s\n",
+ error_message(code));
+ if (code == PROF_NO_SECTION || code == PROF_NO_RELATION)
+ code = KRB5_REALM_UNKNOWN;
+ free(host);
+ return code;
+ }
count = 0;
- while (hostlist[count])
- count++;
-
+ while (hostlist && hostlist[count])
+ count++;
+ Tprintf ("found %d entries under 'kdc'\n", count);
+
if (count == 0) {
- *naddrs = 0;
- return 0;
+ profile_free_list(hostlist);
+ free(host);
+ addrlist->naddrs = 0;
+ return 0;
+ }
+
+ if (get_masters) {
+ realm_srv_names[0] = KRB5_CONF_REALMS;
+ realm_srv_names[1] = host;
+ realm_srv_names[2] = KRB5_CONF_ADMIN_SERVER;
+ realm_srv_names[3] = 0;
+
+ code = profile_get_values(context->profile, realm_srv_names,
+ &masterlist);
+
+ free(host);
+
+ if (code == 0) {
+ for (i=0; masterlist[i]; i++) {
+ host = masterlist[i];
+ /* Strip off excess characters. */
+ if (*host == '[' && (cp = strchr(host, ']')))
+ *(cp + 1) = '\0';
+ else
+ *(host + strcspn(host, " \t:")) = '\0';
+ }
+ }
+ } else {
+ free(host);
}
-
-#ifdef KRB5_USE_INET
+
+ /* at this point, if master is non-NULL, then either the master kdc
+ is required, and there is one, or the master kdc is not required,
+ and there may or may not be one. */
+
+#ifdef HAVE_NETINET_IN_H
if (sec_udpport)
- count = count * 2;
-#endif
-
- addr_p = (struct sockaddr *)malloc (sizeof (struct sockaddr) * count);
-
- for (i=0, out=0; hostlist[i]; i++) {
- hp = gethostbyname(hostlist[i]);
- if (hp != 0) {
- switch (hp->h_addrtype) {
-#ifdef KRB5_USE_INET
- case AF_INET:
- if (udpport) /* must have gotten a port # */
- for (j=0; hp->h_addr_list[j]; j++) {
- sin_p = (struct sockaddr_in *) &addr_p[out++];
- memset ((char *)sin_p, 0, sizeof(struct sockaddr));
- sin_p->sin_family = hp->h_addrtype;
- sin_p->sin_port = udpport;
- memcpy((char *)&sin_p->sin_addr,
- (char *)hp->h_addr_list[j],
- sizeof(struct in_addr));
- if (out >= count) {
- count *= 2;
- addr_p = (struct sockaddr *)
- realloc ((char *)addr_p,
- sizeof(struct sockaddr) * count);
- }
- if (sec_udpport) {
- addr_p[out] = addr_p[out-1];
- sin_p = (struct sockaddr_in *) &addr_p[out++];
- sin_p->sin_port = sec_udpport;
- if (out >= count) {
- count *= 2;
- addr_p = (struct sockaddr *)
- realloc ((char *)addr_p,
- sizeof(struct sockaddr) * count);
- }
- }
- }
- break;
-#endif
- default:
- break;
- }
- }
- free(hostlist[i]);
- hostlist[i] = 0;
- }
- free ((char *)hostlist);
- /*
- * XXX need to distinguish between
- * "can't resolve KDC name" and
- * "can't find any KDC names"
- */
- *addr_pp = addr_p;
- *naddrs = out;
+ count = count * 2;
+#endif
+
+ for (i=0; hostlist[i]; i++) {
+ int p1, p2;
+
+ host = hostlist[i];
+ Tprintf ("entry %d is '%s'\n", i, host);
+ /* Find port number, and strip off any excess characters. */
+ if (*host == '[' && (cp = strchr(host, ']')))
+ cp = cp + 1;
+ else
+ cp = host + strcspn(host, " \t:");
+ port = (*cp == ':') ? cp + 1 : NULL;
+ *cp = '\0';
+
+ ismaster = 0;
+ if (masterlist) {
+ for (j=0; masterlist[j]; j++) {
+ if (strcasecmp(hostlist[i], masterlist[j]) == 0) {
+ ismaster = 1;
+ }
+ }
+ }
+
+ if (get_masters && !ismaster)
+ continue;
+
+ if (port) {
+ unsigned long l;
+#ifdef HAVE_STROUL
+ char *endptr;
+ l = strtoul (port, &endptr, 10);
+ if (endptr == NULL || *endptr != 0)
+ return EINVAL;
+#else
+ l = atoi (port);
+#endif
+ /* L is unsigned, don't need to check <0. */
+ if (l > 65535)
+ return EINVAL;
+ p1 = htons (l);
+ p2 = 0;
+ } else {
+ p1 = udpport;
+ p2 = sec_udpport;
+ }
+
+ /* If the hostname was in brackets, strip those off now. */
+ if (*host == '[' && (cp = strchr(host, ']'))) {
+ host++;
+ *cp = '\0';
+ }
+
+ if (socktype != 0)
+ code = add_host_to_list(addrlist, host, p1, p2, socktype, family);
+ else {
+ code = add_host_to_list(addrlist, host, p1, p2, SOCK_DGRAM,
+ family);
+ if (code == 0)
+ code = add_host_to_list(addrlist, host, p1, p2, SOCK_STREAM,
+ family);
+ }
+ if (code) {
+ Tprintf ("error %d (%s) returned from add_host_to_list\n", code,
+ error_message (code));
+ if (hostlist)
+ profile_free_list (hostlist);
+ if (masterlist)
+ profile_free_list (masterlist);
+ return code;
+ }
+ }
+
+ if (hostlist)
+ profile_free_list(hostlist);
+ if (masterlist)
+ profile_free_list(masterlist);
+
return 0;
}
+
+#ifdef TEST
+static krb5_error_code
+krb5_locate_srv_conf(krb5_context context, const krb5_data *realm,
+ const char *name, struct addrlist *al, int get_masters,
+ int udpport, int sec_udpport)
+{
+ krb5_error_code ret;
+
+ ret = krb5_locate_srv_conf_1 (context, realm, name, al,
+ get_masters, 0, udpport, sec_udpport, 0);
+ if (ret)
+ return ret;
+ if (al->naddrs == 0) /* Couldn't resolve any KDC names */
+ return KRB5_REALM_CANT_RESOLVE;
+ return 0;
+}
+#endif
+
+#ifdef KRB5_DNS_LOOKUP
+static krb5_error_code
+krb5_locate_srv_dns_1 (const krb5_data *realm,
+ const char *service,
+ const char *protocol,
+ struct addrlist *addrlist,
+ int family)
+{
+ struct srv_dns_entry *head = NULL;
+ struct srv_dns_entry *entry = NULL, *next;
+ krb5_error_code code = 0;
+
+ code = krb5int_make_srv_query_realm(realm, service, protocol, &head);
+ if (code)
+ return 0;
+
+ /*
+ * Okay! Now we've got a linked list of entries sorted by
+ * priority. Start looking up A records and returning
+ * addresses.
+ */
+
+ if (head == NULL)
+ return 0;
+
+ /* Check for the "." case indicating no support. */
+ if (head->next == 0 && head->host[0] == 0) {
+ free(head->host);
+ free(head);
+ return KRB5_ERR_NO_SERVICE;
+ }
+
+ Tprintf ("walking answer list:\n");
+ for (entry = head; entry != NULL; entry = next) {
+ Tprintf ("\tport=%d host=%s\n", entry->port, entry->host);
+ next = entry->next;
+ code = add_host_to_list (addrlist, entry->host, htons (entry->port), 0,
+ (strcmp("_tcp", protocol)
+ ? SOCK_DGRAM
+ : SOCK_STREAM), family);
+ if (code) {
+ break;
+ }
+ if (entry == head) {
+ free(entry->host);
+ free(entry);
+ head = next;
+ entry = 0;
+ }
+ }
+ Tprintf ("[end]\n");
+
+ krb5int_free_srv_dns_data(head);
+ return code;
+}
+#endif
+
+#include <krb5/locate_plugin.h>
+
+#if TARGET_OS_MAC
+static const char *objdirs[] = { KRB5_PLUGIN_BUNDLE_DIR, LIBDIR "/krb5/plugins/libkrb5", NULL }; /* should be a list */
+#else
+static const char *objdirs[] = { LIBDIR "/krb5/plugins/libkrb5", NULL };
+#endif
+
+struct module_callback_data {
+ int out_of_mem;
+ struct addrlist *lp;
+};
+
+static int
+module_callback (void *cbdata, int socktype, struct sockaddr *sa)
+{
+ struct module_callback_data *d = cbdata;
+ struct {
+ struct addrinfo ai;
+ union {
+ struct sockaddr_in sin;
+#ifdef KRB5_USE_INET6
+ struct sockaddr_in6 sin6;
+#endif
+ } u;
+ } *x;
+
+ if (socktype != SOCK_STREAM && socktype != SOCK_DGRAM)
+ return 0;
+ if (sa->sa_family != AF_INET
+#ifdef KRB5_USE_INET6
+ && sa->sa_family != AF_INET6
+#endif
+ )
+ return 0;
+ x = calloc (1, sizeof (*x));
+ if (x == 0) {
+ d->out_of_mem = 1;
+ return 1;
+ }
+ x->ai.ai_addr = (struct sockaddr *) &x->u;
+ x->ai.ai_socktype = socktype;
+ x->ai.ai_family = sa->sa_family;
+ if (sa->sa_family == AF_INET) {
+ x->u.sin = *(struct sockaddr_in *)sa;
+ x->ai.ai_addrlen = sizeof(struct sockaddr_in);
+ }
+#ifdef KRB5_USE_INET6
+ if (sa->sa_family == AF_INET6) {
+ x->u.sin6 = *(struct sockaddr_in6 *)sa;
+ x->ai.ai_addrlen = sizeof(struct sockaddr_in6);
+ }
+#endif
+ if (add_addrinfo_to_list (d->lp, &x->ai, free, x) != 0) {
+ /* Assumes only error is ENOMEM. */
+ d->out_of_mem = 1;
+ return 1;
+ }
+ return 0;
+}
+
+static krb5_error_code
+module_locate_server (krb5_context ctx, const krb5_data *realm,
+ struct addrlist *addrlist,
+ enum locate_service_type svc, int socktype, int family)
+{
+ struct krb5plugin_service_locate_result *res = NULL;
+ krb5_error_code code;
+ struct krb5plugin_service_locate_ftable *vtbl = NULL;
+ void **ptrs;
+ char *realmz; /* NUL-terminated realm */
+ int i;
+ struct module_callback_data cbdata = { 0, };
+ const char *msg;
+
+ Tprintf("in module_locate_server\n");
+ cbdata.lp = addrlist;
+ if (!PLUGIN_DIR_OPEN (&ctx->libkrb5_plugins)) {
+
+ code = krb5int_open_plugin_dirs (objdirs, NULL, &ctx->libkrb5_plugins,
+ &ctx->err);
+ if (code)
+ return KRB5_PLUGIN_NO_HANDLE;
+ }
+
+ code = krb5int_get_plugin_dir_data (&ctx->libkrb5_plugins,
+ "service_locator", &ptrs, &ctx->err);
+ if (code) {
+ Tprintf("error looking up plugin symbols: %s\n",
+ (msg = krb5_get_error_message(ctx, code)));
+ krb5_free_error_message(ctx, msg);
+ return KRB5_PLUGIN_NO_HANDLE;
+ }
+
+ if (realm->length >= UINT_MAX) {
+ krb5int_free_plugin_dir_data(ptrs);
+ return ENOMEM;
+ }
+ realmz = malloc(realm->length + 1);
+ if (realmz == NULL) {
+ krb5int_free_plugin_dir_data(ptrs);
+ return ENOMEM;
+ }
+ memcpy(realmz, realm->data, realm->length);
+ realmz[realm->length] = '\0';
+ for (i = 0; ptrs[i]; i++) {
+ void *blob;
+
+ vtbl = ptrs[i];
+ Tprintf("element %d is %p\n", i, ptrs[i]);
+
+ /* For now, don't keep the plugin data alive. For long-lived
+ contexts, it may be desirable to change that later. */
+ code = vtbl->init(ctx, &blob);
+ if (code)
+ continue;
+
+ code = vtbl->lookup(blob, svc, realmz, socktype, family,
+ module_callback, &cbdata);
+ vtbl->fini(blob);
+ if (code == KRB5_PLUGIN_NO_HANDLE) {
+ /* Module passes, keep going. */
+ /* XXX */
+ Tprintf("plugin doesn't handle this realm (KRB5_PLUGIN_NO_HANDLE)\n");
+ continue;
+ }
+ if (code != 0) {
+ /* Module encountered an actual error. */
+ Tprintf("plugin lookup routine returned error %d: %s\n",
+ code, error_message(code));
+ free(realmz);
+ krb5int_free_plugin_dir_data (ptrs);
+ return code;
+ }
+ break;
+ }
+ if (ptrs[i] == NULL) {
+ Tprintf("ran off end of plugin list\n");
+ free(realmz);
+ krb5int_free_plugin_dir_data (ptrs);
+ return KRB5_PLUGIN_NO_HANDLE;
+ }
+ Tprintf("stopped with plugin #%d, res=%p\n", i, res);
+
+ /* Got something back, yippee. */
+ Tprintf("now have %lu addrs in list %p\n",
+ (unsigned long) addrlist->naddrs, addrlist);
+ print_addrlist(addrlist);
+ free(realmz);
+ krb5int_free_plugin_dir_data (ptrs);
+ return 0;
+}
+
+static krb5_error_code
+prof_locate_server (krb5_context context, const krb5_data *realm,
+ struct addrlist *addrlist,
+ enum locate_service_type svc, int socktype, int family)
+{
+ const char *profname;
+ int dflport1, dflport2 = 0;
+ struct servent *serv;
+
+ switch (svc) {
+ case locate_service_kdc:
+ profname = KRB5_CONF_KDC;
+ /* We used to use /etc/services for these, but enough systems
+ have old, crufty, wrong settings that this is probably
+ better. */
+ kdc_ports:
+ dflport1 = htons(KRB5_DEFAULT_PORT);
+ dflport2 = htons(KRB5_DEFAULT_SEC_PORT);
+ break;
+ case locate_service_master_kdc:
+ profname = KRB5_CONF_MASTER_KDC;
+ goto kdc_ports;
+ case locate_service_kadmin:
+ profname = KRB5_CONF_ADMIN_SERVER;
+ dflport1 = htons(DEFAULT_KADM5_PORT);
+ break;
+ case locate_service_krb524:
+ profname = KRB5_CONF_KRB524_SERVER;
+ serv = getservbyname(KRB524_SERVICE, "udp");
+ dflport1 = serv ? serv->s_port : htons (KRB524_PORT);
+ break;
+ case locate_service_kpasswd:
+ profname = KRB5_CONF_KPASSWD_SERVER;
+ dflport1 = htons(DEFAULT_KPASSWD_PORT);
+ break;
+ default:
+ return EBUSY; /* XXX */
+ }
+
+ return krb5_locate_srv_conf_1 (context, realm, profname, addrlist,
+ 0, socktype,
+ dflport1, dflport2, family);
+}
+
+static krb5_error_code
+dns_locate_server (krb5_context context, const krb5_data *realm,
+ struct addrlist *addrlist,
+ enum locate_service_type svc, int socktype, int family)
+{
+ const char *dnsname;
+ int use_dns = _krb5_use_dns_kdc(context);
+ krb5_error_code code;
+
+ if (!use_dns)
+ return KRB5_PLUGIN_NO_HANDLE;
+
+ switch (svc) {
+ case locate_service_kdc:
+ dnsname = "_kerberos";
+ break;
+ case locate_service_master_kdc:
+ dnsname = "_kerberos-master";
+ break;
+ case locate_service_kadmin:
+ dnsname = "_kerberos-adm";
+ break;
+ case locate_service_krb524:
+ dnsname = "_krb524";
+ break;
+ case locate_service_kpasswd:
+ dnsname = "_kpasswd";
+ break;
+ default:
+ return KRB5_PLUGIN_NO_HANDLE;
+ }
+
+ code = 0;
+ if (socktype == SOCK_DGRAM || socktype == 0) {
+ code = krb5_locate_srv_dns_1(realm, dnsname, "_udp", addrlist, family);
+ if (code)
+ Tprintf("dns udp lookup returned error %d\n", code);
+ }
+ if ((socktype == SOCK_STREAM || socktype == 0) && code == 0) {
+ code = krb5_locate_srv_dns_1(realm, dnsname, "_tcp", addrlist, family);
+ if (code)
+ Tprintf("dns tcp lookup returned error %d\n", code);
+ }
+ return code;
+}
+
+/*
+ * Wrapper function for the various backends
+ */
+
+krb5_error_code
+krb5int_locate_server (krb5_context context, const krb5_data *realm,
+ struct addrlist *addrlist,
+ enum locate_service_type svc,
+ int socktype, int family)
+{
+ krb5_error_code code;
+ struct addrlist al = ADDRLIST_INIT;
+
+ *addrlist = al;
+
+ if (realm == NULL || realm->data == NULL || realm->data[0] == 0) {
+ krb5_set_error_message(context, KRB5_REALM_CANT_RESOLVE,
+ "Cannot find KDC for invalid realm name \"\"");
+ return KRB5_REALM_CANT_RESOLVE;
+ }
+
+ code = module_locate_server(context, realm, &al, svc, socktype, family);
+ Tprintf("module_locate_server returns %d\n", code);
+ if (code == KRB5_PLUGIN_NO_HANDLE) {
+ /*
+ * We always try the local file before DNS. Note that there
+ * is no way to indicate "service not available" via the
+ * config file.
+ */
+
+ code = prof_locate_server(context, realm, &al, svc, socktype, family);
+
+#ifdef KRB5_DNS_LOOKUP
+ if (code) { /* Try DNS for all profile errors? */
+ krb5_error_code code2;
+ code2 = dns_locate_server(context, realm, &al, svc, socktype,
+ family);
+ if (code2 != KRB5_PLUGIN_NO_HANDLE)
+ code = code2;
+ }
+#endif /* KRB5_DNS_LOOKUP */
+
+ /* We could put more heuristics here, like looking up a hostname
+ of "kerberos."+REALM, etc. */
+ }
+ if (code == 0)
+ Tprintf ("krb5int_locate_server found %d addresses\n",
+ al.naddrs);
+ else
+ Tprintf ("krb5int_locate_server returning error code %d/%s\n",
+ code, error_message(code));
+ if (code != 0) {
+ if (al.space)
+ free_list (&al);
+ return code;
+ }
+ if (al.naddrs == 0) { /* No good servers */
+ if (al.space)
+ free_list (&al);
+ krb5_set_error_message(context, KRB5_REALM_CANT_RESOLVE,
+ "Cannot resolve network address for KDC in realm \"%.*s\"",
+ realm->length, realm->data);
+
+ return KRB5_REALM_CANT_RESOLVE;
+ }
+ *addrlist = al;
+ return 0;
+}
+
+krb5_error_code
+krb5_locate_kdc(krb5_context context, const krb5_data *realm,
+ struct addrlist *addrlist,
+ int get_masters, int socktype, int family)
+{
+ return krb5int_locate_server(context, realm, addrlist,
+ (get_masters
+ ? locate_service_master_kdc
+ : locate_service_kdc),
+ socktype, family);
+}
projects / krb5.git / blobdiff