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)) {
76 val = smb_strtoul(slash+1,
80 SMB_STR_FULL_STR_CONV);
84 if (!make_netmask(&ss_mask, &ss_tok, val)) {
89 return same_net((struct sockaddr *)(void *)&ss_host,
90 (struct sockaddr *)(void *)&ss_tok,
91 (struct sockaddr *)(void *)&ss_mask);
94 /* string_match - match string s against token tok */
95 static bool string_match(const char *tok,const char *s)
101 /* Return true if a token has the magic value "ALL". Return
102 * true if the token is "FAIL". If the token starts with a "."
103 * (domain name), return true if it matches the last fields of
104 * the string. If the token has the magic value "LOCAL",
105 * return true if the string does not contain a "."
106 * character. If the token ends on a "." (network number),
107 * return true if it matches the first fields of the
108 * string. If the token begins with a "@" (netgroup name),
109 * return true if the string is a (host) member of the
110 * netgroup. Return true if the token fully matches the
111 * string. If the token is a netnumber/netmask pair, return
112 * true if the address is a member of the specified subnet.
115 if (tok[0] == '.') { /* domain: match last fields */
116 if ((str_len = strlen(s)) > (tok_len = strlen(tok))
117 && strequal_m(tok, s + str_len - tok_len)) {
120 } else if (tok[0] == '@') { /* netgroup: look it up */
123 char *mydomain = NULL;
124 char *hostname = NULL;
125 bool netgroup_ok = false;
128 NULL, SINGLETON_CACHE,
129 data_blob_string_const_null("yp_default_domain"),
132 SMB_ASSERT(tmp.length > 0);
133 mydomain = (tmp.data[0] == '\0')
134 ? NULL : (char *)tmp.data;
137 yp_get_default_domain(&mydomain);
140 NULL, SINGLETON_CACHE,
141 data_blob_string_const_null("yp_default_domain"),
142 data_blob_string_const_null(mydomain?mydomain:""));
146 DEBUG(0,("Unable to get default yp domain. "
147 "Try without it.\n"));
149 if (!(hostname = smb_xstrdup(s))) {
150 DEBUG(1,("out of memory for strdup!\n"));
154 netgroup_ok = innetgr(tok + 1, hostname, (char *) 0, mydomain);
156 DBG_INFO("%s %s of domain %s in netgroup %s\n",
157 netgroup_ok ? "Found" : "Could not find",
159 mydomain?mydomain:"(ANY)",
167 DEBUG(0,("access: netgroup support is not configured\n"));
170 } else if (strequal_m(tok, "ALL")) { /* all: match any */
172 } else if (strequal_m(tok, "FAIL")) { /* fail: match any */
174 } else if (strequal_m(tok, "LOCAL")) { /* local: no dots */
175 if (strchr_m(s, '.') == 0 && !strequal_m(s, "unknown")) {
178 } else if (strequal_m(tok, s)) { /* match host name or address */
180 } else if (tok[(tok_len = strlen(tok)) - 1] == '.') { /* network */
181 if (strncmp(tok, s, tok_len) == 0) {
184 } else if ((cut = strchr_m(tok, '/')) != 0) { /* netnumber/netmask */
185 if ((isdigit(s[0]) && strchr_m(tok, '.') != NULL) ||
186 (tok[0] == '[' && cut > tok && cut[-1] == ']') ||
187 ((isxdigit(s[0]) || s[0] == ':') &&
188 strchr_m(tok, ':') != NULL)) {
190 * [IPv6:addr]/netmask or IPv6:addr/netmask */
191 return masked_match(tok, cut, s);
193 } else if (strchr_m(tok, '*') != 0 || strchr_m(tok, '?')) {
194 return unix_wild_match(tok, s);
199 /* client_match - match host name and address against token */
200 bool client_match(const char *tok, const void *item)
202 const char **client = discard_const_p(const char *, item);
203 const char *tok_addr = tok;
204 const char *cli_addr = client[ADDR_INDEX];
207 * tok and client[ADDR_INDEX] can be an IPv4 mapped to IPv6,
208 * we try and match the IPv4 part of address only.
209 * Bug #5311 and #7383.
212 if (strncasecmp_m(tok_addr, "::ffff:", 7) == 0) {
216 if (strncasecmp_m(cli_addr, "::ffff:", 7) == 0) {
221 * Try to match the address first. If that fails, try to match the host
225 if (string_match(tok_addr, cli_addr)) {
229 if (client[NAME_INDEX][0] != 0) {
230 if (string_match(tok, client[NAME_INDEX])) {
238 /* list_match - match an item against a list of tokens with exceptions */
239 bool list_match(const char **list,const void *item,
240 bool (*match_fn)(const char *, const void *))
249 * Process tokens one at a time. We have exhausted all possible matches
250 * when we reach an "EXCEPT" token or the end of the list. If we do find
251 * a match, look for an "EXCEPT" list and recurse to determine whether
252 * the match is affected by any exceptions.
255 for (; *list ; list++) {
256 if (strequal_m(*list, "EXCEPT")) {
257 /* EXCEPT: give up */
260 if ((match = (*match_fn) (*list, item))) {
265 /* Process exceptions to true or FAIL matches. */
267 if (match != false) {
268 while (*list && !strequal_m(*list, "EXCEPT")) {
272 for (; *list; list++) {
273 if ((*match_fn) (*list, item)) {
274 /* Exception Found */
283 /* return true if access should be allowed */
284 static bool allow_access_internal(const char **deny_list,
285 const char **allow_list,
289 const char *client[2];
291 client[NAME_INDEX] = cname;
292 client[ADDR_INDEX] = caddr;
294 /* if it is loopback then always allow unless specifically denied */
295 if (strcmp(caddr, "127.0.0.1") == 0 || strcmp(caddr, "::1") == 0) {
297 * If 127.0.0.1 matches both allow and deny then allow.
298 * Patch from Steve Langasek vorlon@netexpress.net.
301 list_match(deny_list,client,client_match) &&
303 !list_match(allow_list,client, client_match))) {
309 /* if theres no deny list and no allow list then allow access */
310 if ((!deny_list || *deny_list == 0) &&
311 (!allow_list || *allow_list == 0)) {
315 /* if there is an allow list but no deny list then allow only hosts
317 if (!deny_list || *deny_list == 0) {
318 return(list_match(allow_list,client,client_match));
321 /* if theres a deny list but no allow list then allow
322 all hosts not on the deny list */
323 if (!allow_list || *allow_list == 0) {
324 return(!list_match(deny_list,client,client_match));
327 /* if there are both types of list then allow all hosts on the
329 if (list_match(allow_list,(const char *)client,client_match)) {
333 /* if there are both types of list and it's not on the allow then
334 allow it if its not on the deny */
335 if (list_match(deny_list,(const char *)client,client_match)) {
342 /* return true if access should be allowed - doesn't print log message */
343 bool allow_access_nolog(const char **deny_list,
344 const char **allow_list,
349 char *nc_cname = smb_xstrdup(cname);
350 char *nc_caddr = smb_xstrdup(caddr);
352 ret = allow_access_internal(deny_list, allow_list, nc_cname, nc_caddr);
359 /* return true if access should be allowed - prints log message */
360 bool allow_access(const char **deny_list,
361 const char **allow_list,
367 ret = allow_access_nolog(deny_list, allow_list, cname, caddr);
370 ("%s connection from %s (%s)\n",
371 ret ? "Allowed" : "Denied", cname, caddr));