/*
-This module is an adaption of code from the tcpd-1.4 package written
-by Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ This module is an adaption of code from the tcpd-1.4 package written
+ by Wietse Venema, Eindhoven University of Technology, The Netherlands.
-The code is used here with permission.
+ The code is used here with permission.
-The code has been considerably changed from the original. Bug reports
-should be sent to samba-bugs@samba.anu.edu.au
+ The code has been considerably changed from the original. Bug reports
+ should be sent to samba-bugs@samba.org
*/
#include "includes.h"
-#define ALLOW_PURE_ADDRESSES
-
extern int DEBUGLEVEL;
-#ifndef INADDR_NONE
-#define INADDR_NONE ((uint32)~0)
-#endif
-
-
-#define Good True
-#define Bad False
-
-#define CLIENT_MATCH client_match
-
/* Delimiters for lists of daemons or clients. */
+static char *sep = ", \t";
-static char sep[] = ", \t";
-
-/* Constants to be used in assignments only, not in comparisons... */
-
-#define YES 1
-#define NO 0
#define FAIL (-1)
-/* Forward declarations. */
-static int list_match(char *list,char *item, int (*match_fn)(char *, char *));
-static int client_match(char *tok,char *item);
-static int string_match(char *tok,char *s);
-static int masked_match(char *tok, char *slash, char *s);
-
-/* Size of logical line buffer. */
-#define BUFLEN 2048
-
-/* return true if access should be allowed to a service*/
-BOOL check_access(int snum)
+/* masked_match - match address against netnumber/netmask */
+static int masked_match(char *tok, char *slash, char *s)
{
- char *denyl,*allowl;
- BOOL ret = False;
-
- denyl = lp_hostsdeny(snum);
- if (denyl) denyl = strdup(denyl);
-
- allowl = lp_hostsallow(snum);
- if (allowl) allowl = strdup(allowl);
-
- if ((!denyl || *denyl==0) && (!allowl || *allowl==0))
- ret = True;
-
- if (!ret)
- {
- extern int Client;
- if (allow_access(denyl,allowl,client_name(Client),client_addr(Client)))
- {
- if (snum >= 0)
- DEBUG(2,("Allowed connection from %s (%s) to %s\n",
- client_name(Client),client_addr(Client),
- lp_servicename(snum)));
- ret = True;
+ uint32 net;
+ uint32 mask;
+ uint32 addr;
+
+ if ((addr = interpret_addr(s)) == INADDR_NONE)
+ return (False);
+ *slash = 0;
+ net = interpret_addr(tok);
+ *slash = '/';
+ if (net == INADDR_NONE ||
+ (mask = interpret_addr(slash + 1)) == INADDR_NONE) {
+ DEBUG(0,("access: bad net/mask access control: %s\n", tok));
+ return (False);
}
- else
- if (snum >= 0)
- DEBUG(0,("%s Denied connection from %s (%s) to %s\n",
- timestring(), client_name(Client),client_addr(Client),
- lp_servicename(snum)));
- }
-
- if (denyl) free(denyl);
- if (allowl) free(allowl);
- return(ret);
+ return ((addr & mask) == net);
}
-
-/* return true if access should be allowed */
-BOOL allow_access(char *deny_list,char *allow_list,char *cname,char *caddr)
+/* string_match - match string against token */
+static int string_match(char *tok,char *s, char *invalid_char)
{
- char *client[2];
+ size_t tok_len;
+ size_t str_len;
+ 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 */
+#ifdef HAVE_NETGROUP
+ static char *mydomain = NULL;
+ char *hostname = NULL;
+ BOOL netgroup_ok = False;
+
+ if (!mydomain) yp_get_default_domain(&mydomain);
+
+ if (!mydomain) {
+ DEBUG(0,("Unable to get default yp domain.\n"));
+ return False;
+ }
+ if (!(hostname = strdup(s))) {
+ DEBUG(1,("out of memory for strdup!\n"));
+ return False;
+ }
+
+ netgroup_ok = innetgr(tok + 1, hostname, (char *) 0, mydomain);
+
+ DEBUG(5,("looking for %s of domain %s in netgroup %s gave %s\n",
+ hostname,
+ mydomain,
+ tok+1,
+ BOOLSTR(netgroup_ok)));
+
+ free(hostname);
+
+ if (netgroup_ok) return(True);
+#else
+ DEBUG(0,("access: netgroup support is not configured\n"));
+ return (False);
+#endif
+ } else if (strcasecmp(tok, "ALL") == 0) { /* all: match any */
+ return (True);
+ } else if (strcasecmp(tok, "FAIL") == 0) { /* fail: match any */
+ return (FAIL);
+ } else if (strcasecmp(tok, "LOCAL") == 0) { /* local: no dots */
+ if (strchr(s, '.') == 0 && strcasecmp(s, "unknown") != 0)
+ return (True);
+ } else if (!strcasecmp(tok, s)) { /* 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(tok, cut, s))
+ return (True);
+ } else if (strchr(tok, '*') != 0) {
+ *invalid_char = '*';
+ } else if (strchr(tok, '?') != 0) {
+ *invalid_char = '?';
+ }
+ return (False);
+}
- client[0] = cname;
- client[1] = caddr;
- /* 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);
+/* client_match - match host name and address against token */
+static int client_match(char *tok,char *item)
+{
+ char **client = (char **)item;
+ int match;
+ char invalid_char = '\0';
- /* 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(allow_list,(char *)client,CLIENT_MATCH));
+ /*
+ * Try to match the address first. If that fails, try to match the host
+ * name if available.
+ */
- /* 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(deny_list,(char *)client,CLIENT_MATCH));
+ if ((match = string_match(tok, client[1], &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 there are both type of list then allow all hosts on the allow list */
- if (list_match(allow_list,(char *)client,CLIENT_MATCH))
- return (True);
+ if (client[0][0] != 0)
+ match = string_match(tok, client[0], &invalid_char);
- /* if there are both type of list and it's not on the allow then
- allow it if its not on the deny */
- if (list_match(deny_list,(char *)client,CLIENT_MATCH))
- return (False);
+ 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 (True);
+ return (match);
}
/* list_match - match an item against a list of tokens with exceptions */
{
char *tok;
char *listcopy; /* jkf */
- int match = NO;
+ int match = False;
/*
* jkf@soton.ac.uk -- 31 August 1994 -- Stop list_match()
for (tok = strtok(listcopy, sep); tok ; tok = strtok(NULL, sep)) {
if (strcasecmp(tok, "EXCEPT") == 0) /* EXCEPT: give up */
break;
- if ((match = (*match_fn) (tok, item))) /* YES or FAIL */
+ if ((match = (*match_fn) (tok, item))) /* True or FAIL */
break;
}
- /* Process exceptions to YES or FAIL matches. */
+ /* Process exceptions to True or FAIL matches. */
- if (match != NO) {
+ if (match != False) {
while ((tok = strtok((char *) 0, sep)) && strcasecmp(tok, "EXCEPT"))
/* VOID */ ;
- if (tok == 0 || list_match((char *) 0, item, match_fn) == NO) {
+ if (tok == 0 || list_match((char *) 0, item, match_fn) == False) {
if (listcopy != 0) free(listcopy); /* jkf */
return (match);
}
}
if (listcopy != 0) free(listcopy); /* jkf */
- return (NO);
+ return (False);
}
-/* client_match - match host name and address against token */
-static int client_match(char *tok,char *item)
+/* return true if access should be allowed */
+BOOL allow_access(char *deny_list,char *allow_list,
+ char *cname,char *caddr)
{
- char **client = (char **)item;
- int match;
+ char *client[2];
+
+ client[0] = cname;
+ client[1] = caddr;
+
+ /* if it is loopback then always allow unless specifically denied */
+ if (strcmp(caddr, "127.0.0.1") == 0) {
+ if (deny_list &&
+ list_match(deny_list,(char *)client,client_match)) {
+ return False;
+ }
+ return True;
+ }
- /*
- * Try to match the address first. If that fails, try to match the host
- * name if available.
- */
+ /* 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 ((match = string_match(tok, client[1])) == 0)
- if (client[0][0] != 0)
- match = string_match(tok, client[0]);
- return (match);
+ /* 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(allow_list,(char *)client,client_match));
+
+ /* 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(deny_list,(char *)client,client_match));
+
+ /* if there are both type of list then allow all hosts on the
+ allow list */
+ if (list_match(allow_list,(char *)client,client_match))
+ return (True);
+
+ /* if there are both type of list and it's not on the allow then
+ allow it if its not on the deny */
+ if (list_match(deny_list,(char *)client,client_match))
+ return (False);
+
+ return (True);
}
-/* string_match - match string against token */
-static int string_match(char *tok,char *s)
+/* return true if access should be allowed to a service for a socket */
+BOOL check_access(int sock, char *allow_list, char *deny_list)
{
- int tok_len;
- int str_len;
- char *cut;
-
- /*
- * Return YES if a token has the magic value "ALL". Return FAIL if the
- * token is "FAIL". If the token starts with a "." (domain name), return
- * YES if it matches the last fields of the string. If the token has the
- * magic value "LOCAL", return YES if the string does not contain a "."
- * character. If the token ends on a "." (network number), return YES if
- * it matches the first fields of the string. If the token begins with a
- * "@" (netgroup name), return YES if the string is a (host) member of
- * the netgroup. Return YES if the token fully matches the string. If the
- * token is a netnumber/netmask pair, return YES if the address is a
- * member of the specified subnet.
- */
+ BOOL ret = False;
+
+ if (deny_list) deny_list = strdup(deny_list);
+ if (allow_list) allow_list = strdup(allow_list);
- 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 (YES);
- } else if (tok[0] == '@') { /* netgroup: look it up */
-#ifdef NETGROUP
- static char *mydomain = NULL;
- char *hostname = NULL;
- BOOL netgroup_ok = False;
-
- if (!mydomain) yp_get_default_domain(&mydomain);
-
- if (!mydomain) {
- DEBUG(0,("Unable to get default yp domain.\n"));
- return NO;
- }
- if (!(hostname = strdup(s))) {
- DEBUG(1,("out of memory for strdup!\n"));
- return NO;
- }
-
- netgroup_ok = innetgr(tok + 1, hostname, (char *) 0, mydomain);
-
- DEBUG(5,("looking for %s of domain %s in netgroup %s gave %s\n",
- hostname,
- mydomain,
- tok+1,
- BOOLSTR(netgroup_ok)));
-
-#ifdef NETGROUP_INSECURE
- /* if you really want netgroups that match non qualified names
- then define NETGROUP_INSECURE. It can, however, be a big
- security hole */
- {
- char *clnt_domain;
- if (!netgroup_ok && (clnt_domain=strchr(hostname,'.'))) {
- *clnt_domain++ = '\0';
- netgroup_ok = innetgr(tok + 1, hostname, (char *) 0, mydomain);
+ if ((!deny_list || *deny_list==0) && (!allow_list || *allow_list==0)) {
+ ret = True;
}
- }
-#endif
- free(hostname);
-
- if (netgroup_ok) return(YES);
-#else
- DEBUG(0,("access: netgroup support is not configured\n"));
- return (NO);
-#endif
- } else if (strcasecmp(tok, "ALL") == 0) { /* all: match any */
- return (YES);
- } else if (strcasecmp(tok, "FAIL") == 0) { /* fail: match any */
- return (FAIL);
- } else if (strcasecmp(tok, "LOCAL") == 0) { /* local: no dots */
- if (strchr(s, '.') == 0 && strcasecmp(s, "unknown") != 0)
- return (YES);
- } else if (!strcasecmp(tok, s)) { /* match host name or address */
- return (YES);
- } else if (tok[(tok_len = strlen(tok)) - 1] == '.') { /* network */
- if (strncmp(tok, s, tok_len) == 0)
- return (YES);
- } else if ((cut = strchr(tok, '/')) != 0) { /* netnumber/netmask */
- if (isdigit(s[0]) && masked_match(tok, cut, s))
- return (YES);
- }
- return (NO);
-}
+ if (!ret) {
+ if (allow_access(deny_list,allow_list,
+ client_name(sock),client_addr(sock))) {
+ DEBUG(2,("Allowed connection from %s (%s)\n",
+ client_name(sock),client_addr(sock)));
+ ret = True;
+ } else {
+ DEBUG(0,("Denied connection from %s (%s)\n",
+ client_name(sock),client_addr(sock)));
+ }
+ }
-/* masked_match - match address against netnumber/netmask */
-static int masked_match(char *tok, char *slash, char *s)
-{
- uint32 net;
- uint32 mask;
- uint32 addr;
-
- if ((addr = interpret_addr(s)) == INADDR_NONE)
- return (NO);
- *slash = 0;
- net = interpret_addr(tok);
- *slash = '/';
- if (net == INADDR_NONE || (mask = interpret_addr(slash + 1)) == INADDR_NONE) {
- DEBUG(0,("access: bad net/mask access control: %s", tok));
- return (NO);
- }
- return ((addr & mask) == net);
+ if (deny_list) free(deny_list);
+ if (allow_list) free(allow_list);
+ return(ret);
}
-
-
-
-
git.samba.org / kai / samba.git / blobdiff