2 This module is an adaption of code from the tcpd-1.4 package written
3 by Wietse Venema, Eindhoven University of Technology, The Netherlands.
5 The code is used here with permission.
7 The code has been considerably changed from the original. Bug reports
8 should be sent to samba-technical@lists.samba.org
10 Updated for IPv6 by Jeremy Allison (C) 2007.
14 #include "system/locale.h"
15 #include "lib/util/debug.h"
16 #include "../lib/util/memcache.h"
17 #include "lib/socket/interfaces.h"
18 #include "lib/util/samba_util.h"
19 #include "lib/util/util_net.h"
20 #include "lib/util/samba_util.h"
21 #include "lib/util/memory.h"
22 #include "lib/util/access.h"
23 #include "lib/util/unix_match.h"
25 #if defined(HAVE_NETGROUP)
26 #include "system/nis.h"
32 /* masked_match - match address against netnumber/netmask */
33 static bool masked_match(const char *tok, const char *slash, const char *s)
35 struct sockaddr_storage ss_mask;
36 struct sockaddr_storage ss_tok;
37 struct sockaddr_storage ss_host;
38 char *tok_copy = NULL;
40 if (!interpret_string_addr(&ss_host, s, 0)) {
45 /* IPv6 address - remove braces. */
46 tok_copy = smb_xstrdup(tok+1);
50 /* Remove the terminating ']' */
51 tok_copy[PTR_DIFF(slash,tok)-1] = '\0';
53 tok_copy = smb_xstrdup(tok);
57 /* Remove the terminating '/' */
58 tok_copy[PTR_DIFF(slash,tok)] = '\0';
61 if (!interpret_string_addr(&ss_tok, tok_copy, 0)) {
68 if (strlen(slash + 1) > 2) {
69 if (!interpret_string_addr(&ss_mask, slash+1, 0)) {
77 val = strtoul_err(slash+1, &endp, 0, &error);
78 if (error != 0 || *endp != '\0') {
81 if (!make_netmask(&ss_mask, &ss_tok, val)) {
86 return same_net((struct sockaddr *)(void *)&ss_host,
87 (struct sockaddr *)(void *)&ss_tok,
88 (struct sockaddr *)(void *)&ss_mask);
91 /* string_match - match string s against token tok */
92 static bool string_match(const char *tok,const char *s)
98 /* Return true if a token has the magic value "ALL". Return
99 * true if the token is "FAIL". If the token starts with a "."
100 * (domain name), return true if it matches the last fields of
101 * the string. If the token has the magic value "LOCAL",
102 * return true if the string does not contain a "."
103 * character. If the token ends on a "." (network number),
104 * return true if it matches the first fields of the
105 * string. If the token begins with a "@" (netgroup name),
106 * return true if the string is a (host) member of the
107 * netgroup. Return true if the token fully matches the
108 * string. If the token is a netnumber/netmask pair, return
109 * true if the address is a member of the specified subnet.
112 if (tok[0] == '.') { /* domain: match last fields */
113 if ((str_len = strlen(s)) > (tok_len = strlen(tok))
114 && strequal_m(tok, s + str_len - tok_len)) {
117 } else if (tok[0] == '@') { /* netgroup: look it up */
120 char *mydomain = NULL;
121 char *hostname = NULL;
122 bool netgroup_ok = false;
125 NULL, SINGLETON_CACHE,
126 data_blob_string_const_null("yp_default_domain"),
129 SMB_ASSERT(tmp.length > 0);
130 mydomain = (tmp.data[0] == '\0')
131 ? NULL : (char *)tmp.data;
134 yp_get_default_domain(&mydomain);
137 NULL, SINGLETON_CACHE,
138 data_blob_string_const_null("yp_default_domain"),
139 data_blob_string_const_null(mydomain?mydomain:""));
143 DEBUG(0,("Unable to get default yp domain. "
144 "Try without it.\n"));
146 if (!(hostname = smb_xstrdup(s))) {
147 DEBUG(1,("out of memory for strdup!\n"));
151 netgroup_ok = innetgr(tok + 1, hostname, (char *) 0, mydomain);
153 DBG_INFO("%s %s of domain %s in netgroup %s\n",
154 netgroup_ok ? "Found" : "Could not find",
156 mydomain?mydomain:"(ANY)",
164 DEBUG(0,("access: netgroup support is not configured\n"));
167 } else if (strequal_m(tok, "ALL")) { /* all: match any */
169 } else if (strequal_m(tok, "FAIL")) { /* fail: match any */
171 } else if (strequal_m(tok, "LOCAL")) { /* local: no dots */
172 if (strchr_m(s, '.') == 0 && !strequal_m(s, "unknown")) {
175 } else if (strequal_m(tok, s)) { /* match host name or address */
177 } else if (tok[(tok_len = strlen(tok)) - 1] == '.') { /* network */
178 if (strncmp(tok, s, tok_len) == 0) {
181 } else if ((cut = strchr_m(tok, '/')) != 0) { /* netnumber/netmask */
182 if ((isdigit(s[0]) && strchr_m(tok, '.') != NULL) ||
183 (tok[0] == '[' && cut > tok && cut[-1] == ']') ||
184 ((isxdigit(s[0]) || s[0] == ':') &&
185 strchr_m(tok, ':') != NULL)) {
187 * [IPv6:addr]/netmask or IPv6:addr/netmask */
188 return masked_match(tok, cut, s);
190 } else if (strchr_m(tok, '*') != 0 || strchr_m(tok, '?')) {
191 return unix_wild_match(tok, s);
196 /* client_match - match host name and address against token */
197 bool client_match(const char *tok, const void *item)
199 const char **client = discard_const_p(const char *, item);
200 const char *tok_addr = tok;
201 const char *cli_addr = client[ADDR_INDEX];
204 * tok and client[ADDR_INDEX] can be an IPv4 mapped to IPv6,
205 * we try and match the IPv4 part of address only.
206 * Bug #5311 and #7383.
209 if (strncasecmp_m(tok_addr, "::ffff:", 7) == 0) {
213 if (strncasecmp_m(cli_addr, "::ffff:", 7) == 0) {
218 * Try to match the address first. If that fails, try to match the host
222 if (string_match(tok_addr, cli_addr)) {
226 if (client[NAME_INDEX][0] != 0) {
227 if (string_match(tok, client[NAME_INDEX])) {
235 /* list_match - match an item against a list of tokens with exceptions */
236 bool list_match(const char **list,const void *item,
237 bool (*match_fn)(const char *, const void *))
246 * Process tokens one at a time. We have exhausted all possible matches
247 * when we reach an "EXCEPT" token or the end of the list. If we do find
248 * a match, look for an "EXCEPT" list and recurse to determine whether
249 * the match is affected by any exceptions.
252 for (; *list ; list++) {
253 if (strequal_m(*list, "EXCEPT")) {
254 /* EXCEPT: give up */
257 if ((match = (*match_fn) (*list, item))) {
262 /* Process exceptions to true or FAIL matches. */
264 if (match != false) {
265 while (*list && !strequal_m(*list, "EXCEPT")) {
269 for (; *list; list++) {
270 if ((*match_fn) (*list, item)) {
271 /* Exception Found */
280 /* return true if access should be allowed */
281 static bool allow_access_internal(const char **deny_list,
282 const char **allow_list,
286 const char *client[2];
288 client[NAME_INDEX] = cname;
289 client[ADDR_INDEX] = caddr;
291 /* if it is loopback then always allow unless specifically denied */
292 if (strcmp(caddr, "127.0.0.1") == 0 || strcmp(caddr, "::1") == 0) {
294 * If 127.0.0.1 matches both allow and deny then allow.
295 * Patch from Steve Langasek vorlon@netexpress.net.
298 list_match(deny_list,client,client_match) &&
300 !list_match(allow_list,client, client_match))) {
306 /* if theres no deny list and no allow list then allow access */
307 if ((!deny_list || *deny_list == 0) &&
308 (!allow_list || *allow_list == 0)) {
312 /* if there is an allow list but no deny list then allow only hosts
314 if (!deny_list || *deny_list == 0) {
315 return(list_match(allow_list,client,client_match));
318 /* if theres a deny list but no allow list then allow
319 all hosts not on the deny list */
320 if (!allow_list || *allow_list == 0) {
321 return(!list_match(deny_list,client,client_match));
324 /* if there are both types of list then allow all hosts on the
326 if (list_match(allow_list,(const char *)client,client_match)) {
330 /* if there are both types of list and it's not on the allow then
331 allow it if its not on the deny */
332 if (list_match(deny_list,(const char *)client,client_match)) {
339 /* return true if access should be allowed - doesn't print log message */
340 bool allow_access_nolog(const char **deny_list,
341 const char **allow_list,
346 char *nc_cname = smb_xstrdup(cname);
347 char *nc_caddr = smb_xstrdup(caddr);
349 ret = allow_access_internal(deny_list, allow_list, nc_cname, nc_caddr);
356 /* return true if access should be allowed - prints log message */
357 bool allow_access(const char **deny_list,
358 const char **allow_list,
364 ret = allow_access_nolog(deny_list, allow_list, cname, caddr);
367 ("%s connection from %s (%s)\n",
368 ret ? "Allowed" : "Denied", cname, caddr));