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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: rule.c,v 1.8 2004/04/08 01:36:20 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 | |
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29 | /*----- Header files ------------------------------------------------------*/ |
30 | |
31 | /* --- ANSI headers --- */ |
32 | |
33 | #include <stdio.h> |
34 | #include <stdlib.h> |
35 | #include <string.h> |
36 | |
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37 | /* --- Unix headers --- */ |
38 | |
39 | #include <sys/types.h> |
40 | #include <sys/socket.h> |
41 | #include <netinet/in.h> |
42 | #include <arpa/inet.h> |
43 | #include <netdb.h> |
44 | #include <unistd.h> |
45 | |
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46 | /* --- mLib headers --- */ |
47 | |
48 | #include <mLib/alloc.h> |
49 | #include <mLib/report.h> |
50 | #include <mLib/trace.h> |
51 | |
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52 | /* --- Local headers --- */ |
53 | |
54 | #include "become.h" |
55 | #include "class.h" |
56 | #include "rule.h" |
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57 | #include "userdb.h" |
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58 | |
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59 | /*----- Static variables --------------------------------------------------*/ |
60 | |
61 | static rule *rule__list; /* List of rules */ |
62 | static rule *rule__tail; /* Pointer to last rule item */ |
63 | |
64 | /*----- Main code ---------------------------------------------------------*/ |
65 | |
66 | /* --- @rule_init@ --- * |
67 | * |
68 | * Arguments: --- |
69 | * |
70 | * Returns: --- |
71 | * |
72 | * Use: Intialises the rule database. |
73 | */ |
74 | |
75 | void rule_init(void) |
76 | { |
77 | rule__list = 0; |
78 | rule__tail = (rule *)&rule__list; |
79 | } |
80 | |
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81 | /* --- @rule_end@ --- * |
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82 | * |
83 | * Arguments: --- |
84 | * |
85 | * Returns: --- |
86 | * |
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87 | * Use: Empties the rule database. |
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88 | */ |
89 | |
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90 | void rule_end(void) |
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91 | { |
92 | rule *r = rule__list; |
93 | rule *rr; |
94 | |
95 | while (r) { |
96 | rr = r->next; |
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97 | class_dec(r->host); |
98 | class_dec(r->from); |
99 | class_dec(r->to); |
100 | class_dec(r->cmd); |
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101 | free(r); |
102 | r = rr; |
103 | } |
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104 | } |
105 | |
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106 | /* --- @rule_list@ --- * |
107 | * |
108 | * Arguments: --- |
109 | * |
110 | * Returns: The list of rules. |
111 | * |
112 | * Use: Returns the address of the first node in the rule list. |
113 | */ |
114 | |
115 | rule *rule_list(void) |
116 | { |
117 | return (rule__list); |
118 | } |
119 | |
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120 | /* --- @rule_add@ --- * |
121 | * |
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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 |
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126 | * |
127 | * Returns: --- |
128 | * |
129 | * Use: Registers another rule. |
130 | */ |
131 | |
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132 | void rule_add(class_node *host, class_node *from, |
133 | class_node *to, class_node *cmd) |
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134 | { |
135 | rule *r = xmalloc(sizeof(*r)); |
136 | |
137 | r->host = host; |
138 | r->from = from; |
139 | r->to = to; |
140 | r->cmd = cmd; |
141 | r->next = 0; |
142 | rule__tail->next = r; |
143 | rule__tail = r; |
144 | } |
145 | |
146 | /* --- @rule_check@ --- * |
147 | * |
148 | * Arguments: @request *r@ = pointer to a request block |
149 | * |
150 | * Returns: Zero if disallowed, nonzero if allowed. |
151 | * |
152 | * Use: Checks a request to see if it's allowed. |
153 | */ |
154 | |
155 | int rule_check(request *r) |
156 | { |
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157 | rule *rr; |
158 | |
159 | /* --- Trace out the request we're checking --- */ |
160 | |
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), |
165 | AF_INET); |
166 | |
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); |
172 | }) |
173 | |
174 | /* --- Search the rule list --- */ |
175 | |
176 | for (rr = rule__list; rr; rr = rr->next) { |
177 | |
178 | /* --- Trace out the rule --- */ |
179 | |
180 | IF_TRACING(TRACE_RULE, { |
181 | trace(TRACE_RULE, "rule: check against rule..."); |
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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); |
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186 | }) |
187 | |
188 | /* --- Check the rule --- */ |
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189 | |
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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)) { |
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194 | T( trace(TRACE_CHECK, "check: rule matched -- granting permission"); ) |
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195 | return (1); |
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196 | } |
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197 | } |
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198 | |
199 | /* --- Failed to match --- */ |
200 | |
201 | T( trace(TRACE_CHECK, "check: no rules matched -- permission denied"); ) |
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202 | return (0); |
203 | } |
204 | |
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205 | /* --- @rule_dump@ --- * |
206 | * |
207 | * Arguments: --- |
208 | * |
209 | * Returns: --- |
210 | * |
211 | * Use: Dumps a map of the current ruleset to the trace output. |
212 | */ |
213 | |
214 | void rule_dump(void) |
215 | { |
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216 | #ifdef TRACING |
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217 | rule *rr = rule__list; |
218 | |
219 | trace(TRACE_RULE, "rule: dumping rules"); |
220 | while (rr) { |
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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); |
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226 | rr = rr->next; |
227 | } |
228 | trace(TRACE_RULE, "rule: dump finished"); |
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229 | #endif |
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230 | } |
231 | |
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232 | /*----- That's all, folks -------------------------------------------------*/ |