The code is used here with permission.
The code has been considerably changed from the original. Bug reports
- should be sent to samba@samba.org
+ should be sent to samba-technical@lists.samba.org
*/
#include "includes.h"
#include "system/network.h"
#include "lib/socket/socket.h"
-#include "system/locale.h"
-
-#define FAIL (-1)
-#define ALLONES ((uint32_t)0xFFFFFFFF)
-
-/* masked_match - match address against netnumber/netmask */
-static bool masked_match(TALLOC_CTX *mem_ctx, const char *tok, const char *slash, const char *s)
-{
- uint32_t net;
- uint32_t mask;
- uint32_t addr;
- char *tok_cpy;
-
- if ((addr = interpret_addr(s)) == INADDR_NONE)
- return false;
-
- tok_cpy = talloc_strdup(mem_ctx, tok);
- tok_cpy[PTR_DIFF(slash,tok)] = '\0';
- net = interpret_addr(tok_cpy);
- talloc_free(tok_cpy);
-
- if (strlen(slash + 1) > 2) {
- mask = interpret_addr(slash + 1);
- } else {
- mask = (uint32_t)((ALLONES >> atoi(slash + 1)) ^ ALLONES);
- /* convert to network byte order */
- mask = htonl(mask);
- }
-
- if (net == INADDR_NONE || mask == INADDR_NONE) {
- DEBUG(0,("access: bad net/mask access control: %s\n", tok));
- return false;
- }
-
- return (addr & mask) == (net & mask);
-}
-
-/* string_match - match string against token */
-static bool string_match(TALLOC_CTX *mem_ctx, const char *tok,const char *s, char *invalid_char)
-{
- size_t tok_len;
- size_t str_len;
- const char *cut;
-
- *invalid_char = '\0';
-
- /* Return true if a token has the magic value "ALL". Return
- * FAIL if the token is "FAIL". If the token starts with a "."
- * (domain name), return true if it matches the last fields of
- * the string. If the token has the magic value "LOCAL",
- * return true if the string does not contain a "."
- * character. If the token ends on a "." (network number),
- * return true if it matches the first fields of the
- * string. If the token begins with a "@" (netgroup name),
- * return true if the string is a (host) member of the
- * netgroup. Return true if the token fully matches the
- * string. If the token is a netnumber/netmask pair, return
- * true if the address is a member of the specified subnet.
- */
-
- if (tok[0] == '.') { /* domain: match last fields */
- if ((str_len = strlen(s)) > (tok_len = strlen(tok))
- && strcasecmp(tok, s + str_len - tok_len)==0) {
- return true;
- }
- } else if (tok[0] == '@') { /* netgroup: look it up */
- DEBUG(0,("access: netgroup support is not available\n"));
- return false;
- } else if (strcmp(tok, "ALL")==0) { /* all: match any */
- return true;
- } else if (strcmp(tok, "FAIL")==0) { /* fail: match any */
- return FAIL;
- } else if (strcmp(tok, "LOCAL")==0) { /* local: no dots */
- if (strchr(s, '.') == 0 && strcasecmp(s, "unknown") != 0) {
- return true;
- }
- } else if (strcasecmp(tok, s)==0) { /* match host name or address */
- return true;
- } else if (tok[(tok_len = strlen(tok)) - 1] == '.') { /* network */
- if (strncmp(tok, s, tok_len) == 0)
- return true;
- } else if ((cut = strchr(tok, '/')) != 0) { /* netnumber/netmask */
- if (isdigit((int)s[0]) && masked_match(mem_ctx, tok, cut, s))
- return true;
- } else if (strchr(tok, '*') != 0) {
- *invalid_char = '*';
- } else if (strchr(tok, '?') != 0) {
- *invalid_char = '?';
- }
- return false;
-}
-
-struct client_addr {
- const char *cname;
- const char *caddr;
-};
-
-/* client_match - match host name and address against token */
-static bool client_match(TALLOC_CTX *mem_ctx, const char *tok, struct client_addr *client)
-{
- bool match;
- char invalid_char = '\0';
-
- /*
- * Try to match the address first. If that fails, try to match the host
- * name if available.
- */
-
- if ((match = string_match(mem_ctx, tok, client->caddr, &invalid_char)) == 0) {
- if(invalid_char)
- DEBUG(0,("client_match: address match failing due to invalid character '%c' found in \
-token '%s' in an allow/deny hosts line.\n", invalid_char, tok ));
-
- if (client->cname[0] != 0)
- match = string_match(mem_ctx, tok, client->cname, &invalid_char);
-
- if(invalid_char)
- DEBUG(0,("client_match: address match failing due to invalid character '%c' found in \
-token '%s' in an allow/deny hosts line.\n", invalid_char, tok ));
- }
-
- return (match);
-}
-
-/* list_match - match an item against a list of tokens with exceptions */
-static bool list_match(TALLOC_CTX *mem_ctx, const char **list, struct client_addr *client)
-{
- bool match = false;
-
- if (!list)
- return false;
-
- /*
- * Process tokens one at a time. We have exhausted all possible matches
- * when we reach an "EXCEPT" token or the end of the list. If we do find
- * a match, look for an "EXCEPT" list and recurse to determine whether
- * the match is affected by any exceptions.
- */
-
- for (; *list ; list++) {
- if (strcmp(*list, "EXCEPT")==0) /* EXCEPT: give up */
- break;
- if ((match = client_match(mem_ctx, *list, client))) /* true or FAIL */
- break;
- }
-
- /* Process exceptions to true or FAIL matches. */
- if (match != false) {
- while (*list && strcmp(*list, "EXCEPT")!=0)
- list++;
-
- for (; *list; list++) {
- if (client_match(mem_ctx, *list, client)) /* Exception Found */
- return false;
- }
- }
-
- return match;
-}
-
-/* return true if access should be allowed */
-static bool allow_access_internal(TALLOC_CTX *mem_ctx,
- const char **deny_list,const char **allow_list,
- const char *cname, const char *caddr)
-{
- struct client_addr client;
-
- client.cname = cname;
- client.caddr = caddr;
-
- /* if it is loopback then always allow unless specifically denied */
- if (strcmp(caddr, "127.0.0.1") == 0) {
- /*
- * If 127.0.0.1 matches both allow and deny then allow.
- * Patch from Steve Langasek vorlon@netexpress.net.
- */
- if (deny_list &&
- list_match(mem_ctx, deny_list, &client) &&
- (!allow_list ||
- !list_match(mem_ctx, allow_list, &client))) {
- return false;
- }
- return true;
- }
-
- /* if theres no deny list and no allow list then allow access */
- if ((!deny_list || *deny_list == 0) &&
- (!allow_list || *allow_list == 0)) {
- return true;
- }
-
- /* if there is an allow list but no deny list then allow only hosts
- on the allow list */
- if (!deny_list || *deny_list == 0)
- return list_match(mem_ctx, allow_list, &client);
-
- /* if theres a deny list but no allow list then allow
- all hosts not on the deny list */
- if (!allow_list || *allow_list == 0)
- return !list_match(mem_ctx, deny_list, &client);
-
- /* if there are both types of list then allow all hosts on the
- allow list */
- if (list_match(mem_ctx, allow_list, &client))
- return true;
-
- /* if there are both types of list and it's not on the allow then
- allow it if its not on the deny */
- if (list_match(mem_ctx, deny_list, &client))
- return false;
-
- return true;
-}
-
-/* return true if access should be allowed */
-bool allow_access(TALLOC_CTX *mem_ctx,
- const char **deny_list, const char **allow_list,
- const char *cname, const char *caddr)
-{
- bool ret;
- char *nc_cname = talloc_strdup(mem_ctx, cname);
- char *nc_caddr = talloc_strdup(mem_ctx, caddr);
-
- if (!nc_cname || !nc_caddr) {
- return false;
- }
-
- ret = allow_access_internal(mem_ctx, deny_list, allow_list, nc_cname, nc_caddr);
-
- talloc_free(nc_cname);
- talloc_free(nc_caddr);
-
- return ret;
-}
+#include "lib/util/util_net.h"
+#include "lib/util/access.h"
/* return true if the char* contains ip addrs only. Used to avoid
gethostbyaddr() calls */
return false;
}
- ret = allow_access(mem_ctx, deny_list, allow_list, name, addr->addr);
+ ret = allow_access(deny_list, allow_list, name, addr->addr);
if (ret) {
DEBUG(2,("socket_check_access: Allowed connection to '%s' from %s (%s)\n",
git.samba.org / bbaumbach / samba-autobuild / .git / blobdiff