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