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