3 * $Id: rule.c,v 1.2 1997/08/04 10:24:25 mdw Exp $
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of `become'
14 * `Become' is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * `Become' is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with `become'; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 /*----- Revision history --------------------------------------------------*
32 * Revision 1.2 1997/08/04 10:24:25 mdw
33 * Sources placed under CVS control.
35 * Revision 1.1 1997/07/21 13:47:45 mdw
40 /*----- Header files ------------------------------------------------------*/
42 /* --- ANSI headers --- */
48 /* --- Unix headers --- */
50 #include <sys/types.h>
51 #include <sys/socket.h>
52 #include <netinet/in.h>
53 #include <arpa/inet.h>
57 /* --- Local headers --- */
65 /*----- Type definitions --------------------------------------------------*/
67 /* --- Rule block --- */
70 struct rule
*next
; /* Next rule in the list */
71 classdef
*host
; /* Hosts this rule applies to */
72 classdef
*from
; /* From users in this class */
73 classdef
*to
; /* To users in this class */
74 classdef
*cmd
; /* To run commands in this class */
77 /*----- Static variables --------------------------------------------------*/
79 static rule
*rule__list
; /* List of rules */
80 static rule
*rule__tail
; /* Pointer to last rule item */
82 /*----- Main code ---------------------------------------------------------*/
84 /* --- @rule_init@ --- *
90 * Use: Intialises the rule database.
96 rule__tail
= (rule
*)&rule__list
;
99 /* --- @rule_reinit@ --- *
105 * Use: Reinitialises the rule database.
108 void rule_reinit(void)
110 rule
*r
= rule__list
;
122 /* --- @rule_add@ --- *
124 * Arguments: @classdef *host@ = class of hosts this rule applies to
125 * @classdef *from@ = class of users allowed to change
126 * @classdef *to@ = class of users allowed to be changed to
127 * @classdef *cmd@ = class of commands allowed
131 * Use: Registers another rule.
134 void rule_add(classdef
*host
, classdef
*from
, classdef
*to
, classdef
*cmd
)
136 rule
*r
= xmalloc(sizeof(*r
));
143 rule__tail
->next
= r
;
147 /* --- @rule_check@ --- *
149 * Arguments: @request *r@ = pointer to a request block
151 * Returns: Zero if disallowed, nonzero if allowed.
153 * Use: Checks a request to see if it's allowed.
156 int rule_check(request
*r
)
160 /* --- Trace out the request we're checking --- */
162 IF_TRACING(TRACE_CHECK
, {
163 struct passwd
*pw_from
= userdb_userById(r
->from
);
164 struct passwd
*pw_to
= userdb_userById(r
->to
);
165 struct hostent
*h
= gethostbyaddr((char *)&r
->host
, sizeof(r
->host
),
168 trace(TRACE_CHECK
, "check: request from %s (%li) to become %s (%li)",
169 pw_from ? pw_from
->pw_name
: "<unknown>", (long)r
->from
,
170 pw_to ? pw_to
->pw_name
: "<unknown>", (long)r
->to
);
171 trace(TRACE_CHECK
, "check: ... at %s (%s) for `%s'",
172 h ? h
->h_name
: "<unknown>", inet_ntoa(r
->host
), r
->cmd
);
175 /* --- Search the rule list --- */
177 for (rr
= rule__list
; rr
; rr
= rr
->next
) {
179 /* --- Trace out the rule --- */
181 IF_TRACING(TRACE_RULE
, {
182 trace(TRACE_RULE
, "rule: check against rule...");
183 trace(TRACE_RULE
, " from"); class_dump(rr
->from
);
184 trace(TRACE_RULE
, " to"); class_dump(rr
->to
);
185 trace(TRACE_RULE
, " cmd"); class_dump(rr
->cmd
);
186 trace(TRACE_RULE
, " host"); class_dump(rr
->host
);
189 /* --- Check the rule --- */
191 if (class_userMatch(rr
->from
, r
->from
) &&
192 class_userMatch(rr
->to
, r
->to
) &&
193 class_commandMatch(rr
->cmd
, r
->cmd
) &&
194 class_hostMatch(rr
->host
, r
->host
)) {
195 T( trace(TRACE_CHECK
, "check: rule matched -- granting permission"); )
200 /* --- Failed to match --- */
202 T( trace(TRACE_CHECK
, "check: no rules matched -- permission denied"); )
206 /* --- @rule_dump@ --- *
212 * Use: Dumps a map of the current ruleset to the trace output.
217 rule
*rr
= rule__list
;
219 trace(TRACE_RULE
, "rule: dumping rules");
221 trace(TRACE_RULE
, "rule dump...");
222 trace(TRACE_RULE
, " from"); class_dump(rr
->from
);
223 trace(TRACE_RULE
, " to"); class_dump(rr
->to
);
224 trace(TRACE_RULE
, " cmd"); class_dump(rr
->cmd
);
225 trace(TRACE_RULE
, " host"); class_dump(rr
->host
);
228 trace(TRACE_RULE
, "rule: dump finished");
231 /*----- That's all, folks -------------------------------------------------*/