c4f2d992 |
1 | /* -*-c-*- |
2 | * |
f60a3434 |
3 | * $Id: rule.c,v 1.7 2003/10/12 00:14:55 mdw Exp $ |
c4f2d992 |
4 | * |
5 | * Managing rule sets |
6 | * |
c758e654 |
7 | * (c) 1998 EBI |
c4f2d992 |
8 | */ |
9 | |
03f996bd |
10 | /*----- Licensing notice --------------------------------------------------* |
c4f2d992 |
11 | * |
12 | * This file is part of `become' |
13 | * |
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. |
18 | * |
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. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
03f996bd |
25 | * along with `become'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
c4f2d992 |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: rule.c,v $ |
f60a3434 |
32 | * Revision 1.7 2003/10/12 00:14:55 mdw |
33 | * Major overhaul. Now uses DSA signatures rather than the bogus symmetric |
34 | * encrypt-and-hope thing. Integrated with mLib and Catacomb. |
35 | * |
b40be44e |
36 | * Revision 1.6 1998/04/23 13:27:31 mdw |
37 | * Export structure of the rule list, for `bcquery's benefit. |
38 | * |
c758e654 |
39 | * Revision 1.5 1998/01/12 16:46:25 mdw |
40 | * Fix copyright date. |
41 | * |
42 | * Revision 1.4 1997/09/17 10:27:17 mdw |
30868bd5 |
43 | * Use rewritten class handler. |
44 | * |
45 | * Revision 1.3 1997/08/20 16:22:36 mdw |
ce0f6e91 |
46 | * Rename `rule_reinit' to `rule_end' for more sensible restart. Don't try |
47 | * to trace when tracing's turned off. |
48 | * |
03f996bd |
49 | * Revision 1.2 1997/08/04 10:24:25 mdw |
50 | * Sources placed under CVS control. |
51 | * |
52 | * Revision 1.1 1997/07/21 13:47:45 mdw |
c4f2d992 |
53 | * Initial revision |
54 | * |
55 | */ |
56 | |
57 | /*----- Header files ------------------------------------------------------*/ |
58 | |
59 | /* --- ANSI headers --- */ |
60 | |
61 | #include <stdio.h> |
62 | #include <stdlib.h> |
63 | #include <string.h> |
64 | |
03f996bd |
65 | /* --- Unix headers --- */ |
66 | |
67 | #include <sys/types.h> |
68 | #include <sys/socket.h> |
69 | #include <netinet/in.h> |
70 | #include <arpa/inet.h> |
71 | #include <netdb.h> |
72 | #include <unistd.h> |
73 | |
f60a3434 |
74 | /* --- mLib headers --- */ |
75 | |
76 | #include <mLib/alloc.h> |
77 | #include <mLib/report.h> |
78 | #include <mLib/trace.h> |
79 | |
c4f2d992 |
80 | /* --- Local headers --- */ |
81 | |
82 | #include "become.h" |
83 | #include "class.h" |
84 | #include "rule.h" |
03f996bd |
85 | #include "userdb.h" |
c4f2d992 |
86 | |
c4f2d992 |
87 | /*----- Static variables --------------------------------------------------*/ |
88 | |
89 | static rule *rule__list; /* List of rules */ |
90 | static rule *rule__tail; /* Pointer to last rule item */ |
91 | |
92 | /*----- Main code ---------------------------------------------------------*/ |
93 | |
94 | /* --- @rule_init@ --- * |
95 | * |
96 | * Arguments: --- |
97 | * |
98 | * Returns: --- |
99 | * |
100 | * Use: Intialises the rule database. |
101 | */ |
102 | |
103 | void rule_init(void) |
104 | { |
105 | rule__list = 0; |
106 | rule__tail = (rule *)&rule__list; |
107 | } |
108 | |
ce0f6e91 |
109 | /* --- @rule_end@ --- * |
c4f2d992 |
110 | * |
111 | * Arguments: --- |
112 | * |
113 | * Returns: --- |
114 | * |
ce0f6e91 |
115 | * Use: Empties the rule database. |
c4f2d992 |
116 | */ |
117 | |
ce0f6e91 |
118 | void rule_end(void) |
c4f2d992 |
119 | { |
120 | rule *r = rule__list; |
121 | rule *rr; |
122 | |
123 | while (r) { |
124 | rr = r->next; |
ce0f6e91 |
125 | class_dec(r->host); |
126 | class_dec(r->from); |
127 | class_dec(r->to); |
128 | class_dec(r->cmd); |
c4f2d992 |
129 | free(r); |
130 | r = rr; |
131 | } |
c4f2d992 |
132 | } |
133 | |
b40be44e |
134 | /* --- @rule_list@ --- * |
135 | * |
136 | * Arguments: --- |
137 | * |
138 | * Returns: The list of rules. |
139 | * |
140 | * Use: Returns the address of the first node in the rule list. |
141 | */ |
142 | |
143 | rule *rule_list(void) |
144 | { |
145 | return (rule__list); |
146 | } |
147 | |
c4f2d992 |
148 | /* --- @rule_add@ --- * |
149 | * |
30868bd5 |
150 | * Arguments: @class_node *host@ = class of hosts this rule applies to |
151 | * @class_node *from@ = class of users allowed to change |
152 | * @class_node *to@ = class of users allowed to be changed to |
153 | * @class_node *cmd@ = class of commands allowed |
c4f2d992 |
154 | * |
155 | * Returns: --- |
156 | * |
157 | * Use: Registers another rule. |
158 | */ |
159 | |
b40be44e |
160 | void rule_add(class_node *host, class_node *from, |
161 | class_node *to, class_node *cmd) |
c4f2d992 |
162 | { |
163 | rule *r = xmalloc(sizeof(*r)); |
164 | |
165 | r->host = host; |
166 | r->from = from; |
167 | r->to = to; |
168 | r->cmd = cmd; |
169 | r->next = 0; |
170 | rule__tail->next = r; |
171 | rule__tail = r; |
172 | } |
173 | |
174 | /* --- @rule_check@ --- * |
175 | * |
176 | * Arguments: @request *r@ = pointer to a request block |
177 | * |
178 | * Returns: Zero if disallowed, nonzero if allowed. |
179 | * |
180 | * Use: Checks a request to see if it's allowed. |
181 | */ |
182 | |
183 | int rule_check(request *r) |
184 | { |
03f996bd |
185 | rule *rr; |
186 | |
187 | /* --- Trace out the request we're checking --- */ |
188 | |
189 | IF_TRACING(TRACE_CHECK, { |
190 | struct passwd *pw_from = userdb_userById(r->from); |
191 | struct passwd *pw_to = userdb_userById(r->to); |
192 | struct hostent *h = gethostbyaddr((char *)&r->host, sizeof(r->host), |
193 | AF_INET); |
194 | |
195 | trace(TRACE_CHECK, "check: request from %s (%li) to become %s (%li)", |
196 | pw_from ? pw_from->pw_name : "<unknown>", (long)r->from, |
197 | pw_to ? pw_to->pw_name : "<unknown>", (long)r->to); |
198 | trace(TRACE_CHECK, "check: ... at %s (%s) for `%s'", |
199 | h ? h->h_name : "<unknown>", inet_ntoa(r->host), r->cmd); |
200 | }) |
201 | |
202 | /* --- Search the rule list --- */ |
203 | |
204 | for (rr = rule__list; rr; rr = rr->next) { |
205 | |
206 | /* --- Trace out the rule --- */ |
207 | |
208 | IF_TRACING(TRACE_RULE, { |
209 | trace(TRACE_RULE, "rule: check against rule..."); |
30868bd5 |
210 | trace(TRACE_RULE, "rule: from"); class_dump(rr->from, 2); |
211 | trace(TRACE_RULE, "rule: to"); class_dump(rr->to, 2); |
212 | trace(TRACE_RULE, "rule: cmd"); class_dump(rr->cmd, 2); |
213 | trace(TRACE_RULE, "rule: host"); class_dump(rr->host, 2); |
03f996bd |
214 | }) |
215 | |
216 | /* --- Check the rule --- */ |
c4f2d992 |
217 | |
30868bd5 |
218 | if (class_matchUser(rr->from, r->from) && |
219 | class_matchUser(rr->to, r->to) && |
220 | class_matchCommand(rr->cmd, r->cmd) && |
221 | class_matchHost(rr->host, r->host)) { |
03f996bd |
222 | T( trace(TRACE_CHECK, "check: rule matched -- granting permission"); ) |
c4f2d992 |
223 | return (1); |
03f996bd |
224 | } |
c4f2d992 |
225 | } |
03f996bd |
226 | |
227 | /* --- Failed to match --- */ |
228 | |
229 | T( trace(TRACE_CHECK, "check: no rules matched -- permission denied"); ) |
c4f2d992 |
230 | return (0); |
231 | } |
232 | |
03f996bd |
233 | /* --- @rule_dump@ --- * |
234 | * |
235 | * Arguments: --- |
236 | * |
237 | * Returns: --- |
238 | * |
239 | * Use: Dumps a map of the current ruleset to the trace output. |
240 | */ |
241 | |
242 | void rule_dump(void) |
243 | { |
ce0f6e91 |
244 | #ifdef TRACING |
03f996bd |
245 | rule *rr = rule__list; |
246 | |
247 | trace(TRACE_RULE, "rule: dumping rules"); |
248 | while (rr) { |
30868bd5 |
249 | trace(TRACE_RULE, "rule: rule dump..."); |
250 | trace(TRACE_RULE, "rule: from"); class_dump(rr->from, 2); |
251 | trace(TRACE_RULE, "rule: to"); class_dump(rr->to, 2); |
252 | trace(TRACE_RULE, "rule: cmd"); class_dump(rr->cmd, 2); |
253 | trace(TRACE_RULE, "rule: host"); class_dump(rr->host, 2); |
03f996bd |
254 | rr = rr->next; |
255 | } |
256 | trace(TRACE_RULE, "rule: dump finished"); |
ce0f6e91 |
257 | #endif |
03f996bd |
258 | } |
259 | |
c4f2d992 |
260 | /*----- That's all, folks -------------------------------------------------*/ |