3 * $Id: rule.c,v 1.8 2004/04/08 01:36:20 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 /*----- Header files ------------------------------------------------------*/
31 /* --- ANSI headers --- */
37 /* --- Unix headers --- */
39 #include <sys/types.h>
40 #include <sys/socket.h>
41 #include <netinet/in.h>
42 #include <arpa/inet.h>
46 /* --- mLib headers --- */
48 #include <mLib/alloc.h>
49 #include <mLib/report.h>
50 #include <mLib/trace.h>
52 /* --- Local headers --- */
59 /*----- Static variables --------------------------------------------------*/
61 static rule *rule__list; /* List of rules */
62 static rule *rule__tail; /* Pointer to last rule item */
64 /*----- Main code ---------------------------------------------------------*/
66 /* --- @rule_init@ --- *
72 * Use: Intialises the rule database.
78 rule__tail = (rule *)&rule__list;
81 /* --- @rule_end@ --- *
87 * Use: Empties the rule database.
106 /* --- @rule_list@ --- *
110 * Returns: The list of rules.
112 * Use: Returns the address of the first node in the rule list.
115 rule *rule_list(void)
120 /* --- @rule_add@ --- *
122 * Arguments: @class_node *host@ = class of hosts this rule applies to
123 * @class_node *from@ = class of users allowed to change
124 * @class_node *to@ = class of users allowed to be changed to
125 * @class_node *cmd@ = class of commands allowed
129 * Use: Registers another rule.
132 void rule_add(class_node *host, class_node *from,
133 class_node *to, class_node *cmd)
135 rule *r = xmalloc(sizeof(*r));
142 rule__tail->next = r;
146 /* --- @rule_check@ --- *
148 * Arguments: @request *r@ = pointer to a request block
150 * Returns: Zero if disallowed, nonzero if allowed.
152 * Use: Checks a request to see if it's allowed.
155 int rule_check(request *r)
159 /* --- Trace out the request we're checking --- */
161 IF_TRACING(TRACE_CHECK, {
162 struct passwd *pw_from = userdb_userById(r->from);
163 struct passwd *pw_to = userdb_userById(r->to);
164 struct hostent *h = gethostbyaddr((char *)&r->host, sizeof(r->host),
167 trace(TRACE_CHECK, "check: request from %s (%li) to become %s (%li)",
168 pw_from ? pw_from->pw_name : "<unknown>", (long)r->from,
169 pw_to ? pw_to->pw_name : "<unknown>", (long)r->to);
170 trace(TRACE_CHECK, "check: ... at %s (%s) for `%s'",
171 h ? h->h_name : "<unknown>", inet_ntoa(r->host), r->cmd);
174 /* --- Search the rule list --- */
176 for (rr = rule__list; rr; rr = rr->next) {
178 /* --- Trace out the rule --- */
180 IF_TRACING(TRACE_RULE, {
181 trace(TRACE_RULE, "rule: check against rule...");
182 trace(TRACE_RULE, "rule: from"); class_dump(rr->from, 2);
183 trace(TRACE_RULE, "rule: to"); class_dump(rr->to, 2);
184 trace(TRACE_RULE, "rule: cmd"); class_dump(rr->cmd, 2);
185 trace(TRACE_RULE, "rule: host"); class_dump(rr->host, 2);
188 /* --- Check the rule --- */
190 if (class_matchUser(rr->from, r->from) &&
191 class_matchUser(rr->to, r->to) &&
192 class_matchCommand(rr->cmd, r->cmd) &&
193 class_matchHost(rr->host, r->host)) {
194 T( trace(TRACE_CHECK, "check: rule matched -- granting permission"); )
199 /* --- Failed to match --- */
201 T( trace(TRACE_CHECK, "check: no rules matched -- permission denied"); )
205 /* --- @rule_dump@ --- *
211 * 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: rule dump...");
222 trace(TRACE_RULE, "rule: from"); class_dump(rr->from, 2);
223 trace(TRACE_RULE, "rule: to"); class_dump(rr->to, 2);
224 trace(TRACE_RULE, "rule: cmd"); class_dump(rr->cmd, 2);
225 trace(TRACE_RULE, "rule: host"); class_dump(rr->host, 2);
228 trace(TRACE_RULE, "rule: dump finished");
232 /*----- That's all, folks -------------------------------------------------*/