* Routines to authenticate access to a daemon (hosts allow/deny).
*
* Copyright (C) 1998 Andrew Tridgell
- * Copyright (C) 2004-2009 Wayne Davison
+ * Copyright (C) 2004-2022 Wayne Davison
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
*/
#include "rsync.h"
+#include "ifuncs.h"
+#ifdef HAVE_NETGROUP_H
+#include <netgroup.h>
+#endif
+
+static int allow_forward_dns;
-static int match_hostname(char *host, char *tok)
+extern const char undetermined_hostname[];
+
+static int match_hostname(const char **host_ptr, const char *addr, const char *tok)
{
+ struct hostent *hp;
+ unsigned int i;
+ const char *host = *host_ptr;
+
if (!host || !*host)
return 0;
- return wildmatch(tok, host);
+
+#ifdef HAVE_INNETGR
+ if (*tok == '@' && tok[1])
+ return innetgr(tok + 1, host, NULL, NULL);
+#endif
+
+ /* First check if the reverse-DNS-determined hostname matches. */
+ if (iwildmatch(tok, host))
+ return 1;
+
+ if (!allow_forward_dns)
+ return 0;
+
+ /* Fail quietly if tok is an address or wildcarded entry, not a simple hostname. */
+ if (!tok[strspn(tok, ".0123456789")] || tok[strcspn(tok, ":/*?[")])
+ return 0;
+
+ /* Now try forward-DNS on the token (config-specified hostname) and see if the IP matches. */
+ if (!(hp = gethostbyname(tok)))
+ return 0;
+
+ for (i = 0; hp->h_addr_list[i] != NULL; i++) {
+ if (strcmp(addr, inet_ntoa(*(struct in_addr*)(hp->h_addr_list[i]))) == 0) {
+ /* If reverse lookups are off, we'll use the conf-specified
+ * hostname in preference to UNDETERMINED. */
+ if (host == undetermined_hostname)
+ *host_ptr = strdup(tok);
+ return 1;
+ }
+ }
+
+ return 0;
}
-static int match_binary(char *b1, char *b2, char *mask, int addrlen)
+static int match_binary(const char *b1, const char *b2, const char *mask, int addrlen)
{
int i;
return;
}
-static int match_address(char *addr, char *tok)
+static int match_address(const char *addr, const char *tok)
{
char *p;
struct addrinfo hints, *resa, *rest;
#endif
char mask[16];
char *a = NULL, *t = NULL;
- unsigned int len;
if (!addr || !*addr)
return 0;
p = strchr(tok,'/');
- if (p) {
+ if (p)
*p = '\0';
- len = p - tok;
- } else
- len = strlen(tok);
- /* Fail quietly if tok is a hostname (not an address) */
- if (strspn(tok, ".0123456789") != len
-#ifdef INET6
- && strchr(tok, ':') == NULL
-#endif
- ) {
+ /* Fail quietly if tok is a hostname, not an address. */
+ if (tok[strspn(tok, ".0123456789")] && strchr(tok, ':') == NULL) {
if (p)
*p = '/';
return 0;
break;
#ifdef INET6
- case PF_INET6:
- {
+ case PF_INET6: {
struct sockaddr_in6 *sin6a, *sin6t;
sin6a = (struct sockaddr_in6 *)resa->ai_addr;
addrlen = 16;
#ifdef HAVE_SOCKADDR_IN6_SCOPE_ID
- if (sin6t->sin6_scope_id &&
- sin6a->sin6_scope_id != sin6t->sin6_scope_id) {
+ if (sin6t->sin6_scope_id && sin6a->sin6_scope_id != sin6t->sin6_scope_id) {
ret = 0;
goto out;
}
#endif
break;
- }
+ }
#endif
default:
- rprintf(FLOG, "unknown family %u\n", rest->ai_family);
- ret = 0;
- goto out;
+ rprintf(FLOG, "unknown family %u\n", rest->ai_family);
+ ret = 0;
+ goto out;
}
bits = -1;
return ret;
}
-static int access_match(char *list, char *addr, char *host)
+static int access_match(const char *list, const char *addr, const char **host_ptr)
{
char *tok;
char *list2 = strdup(list);
- if (!list2)
- out_of_memory("access_match");
-
strlower(list2);
- if (host)
- strlower(host);
for (tok = strtok(list2, " ,\t"); tok; tok = strtok(NULL, " ,\t")) {
- if (match_hostname(host, tok) || match_address(addr, tok)) {
+ if (match_hostname(host_ptr, addr, tok) || match_address(addr, tok)) {
free(list2);
return 1;
}
return 0;
}
-int allow_access(char *addr, char *host, char *allow_list, char *deny_list)
+int allow_access(const char *addr, const char **host_ptr, int i)
{
+ const char *allow_list = lp_hosts_allow(i);
+ const char *deny_list = lp_hosts_deny(i);
+
if (allow_list && !*allow_list)
allow_list = NULL;
if (deny_list && !*deny_list)
deny_list = NULL;
+ allow_forward_dns = lp_forward_lookup(i);
+
/* If we match an allow-list item, we always allow access. */
if (allow_list) {
- if (access_match(allow_list, addr, host))
+ if (access_match(allow_list, addr, host_ptr))
return 1;
/* For an allow-list w/o a deny-list, disallow non-matches. */
if (!deny_list)
/* If we match a deny-list item (and got past any allow-list
* items), we always disallow access. */
- if (deny_list && access_match(deny_list, addr, host))
+ if (deny_list && access_match(deny_list, addr, host_ptr))
return 0;
/* Allow all other access. */
git.samba.org / rsync.git / blobdiff