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