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