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-bugs@samba.anu.edu.au
13 extern int DEBUGLEVEL
;
15 /* Delimiters for lists of daemons or clients. */
16 static char *sep
= ", \t";
20 /* masked_match - match address against netnumber/netmask */
21 static int masked_match(char *tok
, char *slash
, char *s
)
27 if ((addr
= interpret_addr(s
)) == INADDR_NONE
)
30 net
= interpret_addr(tok
);
32 if (net
== INADDR_NONE
||
33 (mask
= interpret_addr(slash
+ 1)) == INADDR_NONE
) {
34 DEBUG(0,("access: bad net/mask access control: %s\n", tok
));
37 return ((addr
& mask
) == net
);
40 /* string_match - match string against token */
41 static int string_match(char *tok
,char *s
)
47 /* Return True if a token has the magic value "ALL". Return
48 * FAIL if the token is "FAIL". If the token starts with a "."
49 * (domain name), return True if it matches the last fields of
50 * the string. If the token has the magic value "LOCAL",
51 * return True if the string does not contain a "."
52 * character. If the token ends on a "." (network number),
53 * return True if it matches the first fields of the
54 * string. If the token begins with a "@" (netgroup name),
55 * return True if the string is a (host) member of the
56 * netgroup. Return True if the token fully matches the
57 * string. If the token is a netnumber/netmask pair, return
58 * True if the address is a member of the specified subnet. */
60 if (tok
[0] == '.') { /* domain: match last fields */
61 if ((str_len
= strlen(s
)) > (tok_len
= strlen(tok
))
62 && strcasecmp(tok
, s
+ str_len
- tok_len
) == 0)
64 } else if (tok
[0] == '@') { /* netgroup: look it up */
66 static char *mydomain
= NULL
;
67 char *hostname
= NULL
;
68 BOOL netgroup_ok
= False
;
70 if (!mydomain
) yp_get_default_domain(&mydomain
);
73 DEBUG(0,("Unable to get default yp domain.\n"));
76 if (!(hostname
= strdup(s
))) {
77 DEBUG(1,("out of memory for strdup!\n"));
81 netgroup_ok
= innetgr(tok
+ 1, hostname
, (char *) 0, mydomain
);
83 DEBUG(5,("looking for %s of domain %s in netgroup %s gave %s\n",
87 BOOLSTR(netgroup_ok
)));
91 if (netgroup_ok
) return(True
);
93 DEBUG(0,("access: netgroup support is not configured\n"));
96 } else if (strcasecmp(tok
, "ALL") == 0) { /* all: match any */
98 } else if (strcasecmp(tok
, "FAIL") == 0) { /* fail: match any */
100 } else if (strcasecmp(tok
, "LOCAL") == 0) { /* local: no dots */
101 if (strchr(s
, '.') == 0 && strcasecmp(s
, "unknown") != 0)
103 } else if (!strcasecmp(tok
, s
)) { /* match host name or address */
105 } else if (tok
[(tok_len
= strlen(tok
)) - 1] == '.') { /* network */
106 if (strncmp(tok
, s
, tok_len
) == 0)
108 } else if ((cut
= strchr(tok
, '/')) != 0) { /* netnumber/netmask */
109 if (isdigit((int)s
[0]) && masked_match(tok
, cut
, s
))
116 /* client_match - match host name and address against token */
117 static int client_match(char *tok
,char *item
)
119 char **client
= (char **)item
;
123 * Try to match the address first. If that fails, try to match the host
127 if ((match
= string_match(tok
, client
[1])) == 0)
128 if (client
[0][0] != 0)
129 match
= string_match(tok
, client
[0]);
133 /* list_match - match an item against a list of tokens with exceptions */
134 /* (All modifications are marked with the initials "jkf") */
135 static int list_match(char *list
,char *item
, int (*match_fn
)(char *, char *))
138 char *listcopy
; /* jkf */
142 * jkf@soton.ac.uk -- 31 August 1994 -- Stop list_match()
143 * overwriting the list given as its first parameter.
146 /* jkf -- can get called recursively with NULL list */
147 listcopy
= (list
== 0) ? (char *)0 : strdup(list
);
150 * Process tokens one at a time. We have exhausted all possible matches
151 * when we reach an "EXCEPT" token or the end of the list. If we do find
152 * a match, look for an "EXCEPT" list and recurse to determine whether
153 * the match is affected by any exceptions.
156 for (tok
= strtok(listcopy
, sep
); tok
; tok
= strtok(NULL
, sep
)) {
157 if (strcasecmp(tok
, "EXCEPT") == 0) /* EXCEPT: give up */
159 if ((match
= (*match_fn
) (tok
, item
))) /* True or FAIL */
162 /* Process exceptions to True or FAIL matches. */
164 if (match
!= False
) {
165 while ((tok
= strtok((char *) 0, sep
)) && strcasecmp(tok
, "EXCEPT"))
167 if (tok
== 0 || list_match((char *) 0, item
, match_fn
) == False
) {
168 if (listcopy
!= 0) free(listcopy
); /* jkf */
173 if (listcopy
!= 0) free(listcopy
); /* jkf */
178 /* return true if access should be allowed */
179 BOOL
allow_access(char *deny_list
,char *allow_list
,
180 char *cname
,char *caddr
)
187 /* if theres no deny list and no allow list then allow access */
188 if ((!deny_list
|| *deny_list
== 0) &&
189 (!allow_list
|| *allow_list
== 0)) {
193 /* if there is an allow list but no deny list then allow only hosts
195 if (!deny_list
|| *deny_list
== 0)
196 return(list_match(allow_list
,(char *)client
,client_match
));
198 /* if theres a deny list but no allow list then allow
199 all hosts not on the deny list */
200 if (!allow_list
|| *allow_list
== 0)
201 return(!list_match(deny_list
,(char *)client
,client_match
));
203 /* if there are both type of list then allow all hosts on the
205 if (list_match(allow_list
,(char *)client
,client_match
))
208 /* if there are both type of list and it's not on the allow then
209 allow it if its not on the deny */
210 if (list_match(deny_list
,(char *)client
,client_match
))
216 /* return true if access should be allowed to a service for a socket */
217 BOOL
check_access(int sock
, char *allow_list
, char *deny_list
)
221 if (deny_list
) deny_list
= strdup(deny_list
);
222 if (allow_list
) allow_list
= strdup(allow_list
);
224 if ((!deny_list
|| *deny_list
==0) && (!allow_list
|| *allow_list
==0)) {
229 if (allow_access(deny_list
,allow_list
,
230 client_name(sock
),client_addr(sock
))) {
231 DEBUG(2,("Allowed connection from %s (%s)\n",
232 client_name(sock
),client_addr(sock
)));
235 DEBUG(0,("Denied connection from %s (%s)\n",
236 client_name(sock
),client_addr(sock
)));
240 if (deny_list
) free(deny_list
);
241 if (allow_list
) free(allow_list
);