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0756eb3c PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
80fea873 | 5 | /* Copyright (c) University of Cambridge 1995 - 2016 */ |
0756eb3c PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | /* This file was originally supplied by Ian Kirk. The libradius support came | |
9 | from Alex Kiernan. */ | |
10 | ||
27d93664 JH |
11 | /* ugly hack to work around redefinition of ENV by radiusclient.h and |
12 | * db.h: define _DB_H_ so the db.h include thinks it's already included, | |
13 | * we can get away with it like this, since this file doesn't use any db | |
14 | * functions. */ | |
15 | #ifndef _DB_H_ | |
16 | # define _DB_H_ 1 | |
17 | # define _DB_EXT_PROT_IN_ 1 | |
18 | # define DB void | |
19 | #endif | |
20 | ||
0756eb3c PH |
21 | #include "../exim.h" |
22 | ||
23 | /* This module contains functions that call the Radius authentication | |
24 | mechanism. | |
25 | ||
26 | We can't just compile this code and allow the library mechanism to omit the | |
27 | functions if they are not wanted, because we need to have the Radius headers | |
28 | available for compiling. Therefore, compile these functions only if | |
29 | RADIUS_CONFIG_FILE is defined. However, some compilers don't like compiling | |
30 | empty modules, so keep them happy with a dummy when skipping the rest. Make it | |
31 | reference itself to stop picky compilers complaining that it is unused, and put | |
32 | in a dummy argument to stop even pickier compilers complaining about infinite | |
e1d15f5e | 33 | loops. Then use a mutually-recursive pair as gcc is just getting stupid. */ |
0756eb3c PH |
34 | |
35 | #ifndef RADIUS_CONFIG_FILE | |
e1d15f5e JH |
36 | static void dummy(int x); |
37 | static void dummy2(int x) { dummy(x-1); } | |
38 | static void dummy(int x) { dummy2(x-1); } | |
0756eb3c PH |
39 | #else /* RADIUS_CONFIG_FILE */ |
40 | ||
41 | ||
7766a4f0 PH |
42 | /* Two different Radius libraries are supported. The default is radiusclient, |
43 | using its original API. At release 0.4.0 the API changed. */ | |
0756eb3c PH |
44 | |
45 | #ifdef RADIUS_LIB_RADLIB | |
46 | #include <radlib.h> | |
47 | #else | |
7766a4f0 | 48 | #if !defined(RADIUS_LIB_RADIUSCLIENT) && !defined(RADIUS_LIB_RADIUSCLIENTNEW) |
27d93664 JH |
49 | # define RADIUS_LIB_RADIUSCLIENT |
50 | #endif | |
51 | ||
52 | #ifdef RADIUS_LIB_RADIUSCLIENTNEW | |
53 | # include <freeradius-client.h> | |
54 | #else | |
55 | # include <radiusclient.h> | |
0756eb3c | 56 | #endif |
0756eb3c PH |
57 | #endif |
58 | ||
59 | ||
60 | ||
61 | /************************************************* | |
62 | * Perform RADIUS authentication * | |
63 | *************************************************/ | |
64 | ||
65 | /* This function calls the Radius authentication mechanism, passing over one or | |
66 | more data strings. | |
67 | ||
68 | Arguments: | |
69 | s a colon-separated list of strings | |
70 | errptr where to point an error message | |
71 | ||
72 | Returns: OK if authentication succeeded | |
73 | FAIL if authentication failed | |
74 | ERROR some other error condition | |
75 | */ | |
76 | ||
77 | int | |
1b2adaee | 78 | auth_call_radius(const uschar *s, uschar **errptr) |
0756eb3c PH |
79 | { |
80 | uschar *user; | |
1b2adaee | 81 | const uschar *radius_args = s; |
0756eb3c PH |
82 | int result; |
83 | int sep = 0; | |
84 | ||
85 | #ifdef RADIUS_LIB_RADLIB | |
7766a4f0 | 86 | struct rad_handle *h; |
0756eb3c | 87 | #else |
7766a4f0 PH |
88 | #ifdef RADIUS_LIB_RADIUSCLIENTNEW |
89 | rc_handle *h; | |
90 | #endif | |
91 | VALUE_PAIR *send = NULL; | |
92 | VALUE_PAIR *received; | |
93 | unsigned int service = PW_AUTHENTICATE_ONLY; | |
94 | char msg[4096]; | |
0756eb3c PH |
95 | #endif |
96 | ||
97 | ||
98 | user = string_nextinlist(&radius_args, &sep, big_buffer, big_buffer_size); | |
99 | if (user == NULL) user = US""; | |
100 | ||
101 | DEBUG(D_auth) debug_printf("Running RADIUS authentication for user \"%s\" " | |
102 | "and \"%s\"\n", user, radius_args); | |
103 | ||
104 | *errptr = NULL; | |
105 | ||
106 | ||
107 | /* Authenticate using the radiusclient library */ | |
108 | ||
7766a4f0 | 109 | #ifndef RADIUS_LIB_RADLIB |
0756eb3c PH |
110 | |
111 | rc_openlog("exim"); | |
112 | ||
7766a4f0 | 113 | #ifdef RADIUS_LIB_RADIUSCLIENT |
0756eb3c PH |
114 | if (rc_read_config(RADIUS_CONFIG_FILE) != 0) |
115 | *errptr = string_sprintf("RADIUS: can't open %s", RADIUS_CONFIG_FILE); | |
116 | ||
117 | else if (rc_read_dictionary(rc_conf_str("dictionary")) != 0) | |
118 | *errptr = string_sprintf("RADIUS: can't read dictionary"); | |
119 | ||
120 | else if (rc_avpair_add(&send, PW_USER_NAME, user, 0) == NULL) | |
121 | *errptr = string_sprintf("RADIUS: add user name failed\n"); | |
122 | ||
123 | else if (rc_avpair_add(&send, PW_USER_PASSWORD, CS radius_args, 0) == NULL) | |
124 | *errptr = string_sprintf("RADIUS: add password failed\n"); | |
125 | ||
126 | else if (rc_avpair_add(&send, PW_SERVICE_TYPE, &service, 0) == NULL) | |
127 | *errptr = string_sprintf("RADIUS: add service type failed\n"); | |
128 | ||
7766a4f0 PH |
129 | #else /* RADIUS_LIB_RADIUSCLIENT unset => RADIUS_LIB_RADIUSCLIENT2 */ |
130 | ||
750af86e | 131 | if ((h = rc_read_config(RADIUS_CONFIG_FILE)) == NULL) |
7766a4f0 PH |
132 | *errptr = string_sprintf("RADIUS: can't open %s", RADIUS_CONFIG_FILE); |
133 | ||
134 | else if (rc_read_dictionary(h, rc_conf_str(h, "dictionary")) != 0) | |
135 | *errptr = string_sprintf("RADIUS: can't read dictionary"); | |
136 | ||
750af86e | 137 | else if (rc_avpair_add(h, &send, PW_USER_NAME, user, Ustrlen(user), 0) == NULL) |
7766a4f0 PH |
138 | *errptr = string_sprintf("RADIUS: add user name failed\n"); |
139 | ||
750af86e PH |
140 | else if (rc_avpair_add(h, &send, PW_USER_PASSWORD, CS radius_args, |
141 | Ustrlen(radius_args), 0) == NULL) | |
7766a4f0 PH |
142 | *errptr = string_sprintf("RADIUS: add password failed\n"); |
143 | ||
144 | else if (rc_avpair_add(h, &send, PW_SERVICE_TYPE, &service, 0, 0) == NULL) | |
145 | *errptr = string_sprintf("RADIUS: add service type failed\n"); | |
146 | ||
147 | #endif /* RADIUS_LIB_RADIUSCLIENT */ | |
148 | ||
0756eb3c PH |
149 | if (*errptr != NULL) |
150 | { | |
151 | DEBUG(D_auth) debug_printf("%s\n", *errptr); | |
152 | return ERROR; | |
153 | } | |
154 | ||
7766a4f0 | 155 | #ifdef RADIUS_LIB_RADIUSCLIENT |
0756eb3c | 156 | result = rc_auth(0, send, &received, msg); |
7766a4f0 PH |
157 | #else |
158 | result = rc_auth(h, 0, send, &received, msg); | |
159 | #endif | |
160 | ||
0756eb3c PH |
161 | DEBUG(D_auth) debug_printf("RADIUS code returned %d\n", result); |
162 | ||
163 | switch (result) | |
164 | { | |
165 | case OK_RC: | |
166 | return OK; | |
167 | ||
860cdda2 | 168 | case REJECT_RC: |
0756eb3c PH |
169 | case ERROR_RC: |
170 | return FAIL; | |
171 | ||
172 | case TIMEOUT_RC: | |
173 | *errptr = US"RADIUS: timed out"; | |
174 | return ERROR; | |
175 | ||
176 | default: | |
177 | case BADRESP_RC: | |
178 | *errptr = string_sprintf("RADIUS: unexpected response (%d)", result); | |
179 | return ERROR; | |
180 | } | |
181 | ||
7766a4f0 | 182 | #else /* RADIUS_LIB_RADLIB is set */ |
0756eb3c PH |
183 | |
184 | /* Authenticate using the libradius library */ | |
185 | ||
186 | h = rad_auth_open(); | |
187 | if (h == NULL) | |
188 | { | |
189 | *errptr = string_sprintf("RADIUS: can't initialise libradius"); | |
190 | return ERROR; | |
191 | } | |
192 | if (rad_config(h, RADIUS_CONFIG_FILE) != 0 || | |
193 | rad_create_request(h, RAD_ACCESS_REQUEST) != 0 || | |
194 | rad_put_string(h, RAD_USER_NAME, CS user) != 0 || | |
195 | rad_put_string(h, RAD_USER_PASSWORD, CS radius_args) != 0 || | |
b4a9bda2 PH |
196 | rad_put_int(h, RAD_SERVICE_TYPE, RAD_AUTHENTICATE_ONLY) != 0 || |
197 | rad_put_string(h, RAD_NAS_IDENTIFIER, CS primary_hostname) != 0) | |
0756eb3c PH |
198 | { |
199 | *errptr = string_sprintf("RADIUS: %s", rad_strerror(h)); | |
200 | result = ERROR; | |
201 | } | |
202 | else | |
203 | { | |
204 | result = rad_send_request(h); | |
205 | ||
206 | switch(result) | |
207 | { | |
208 | case RAD_ACCESS_ACCEPT: | |
209 | result = OK; | |
210 | break; | |
211 | ||
212 | case RAD_ACCESS_REJECT: | |
213 | result = FAIL; | |
214 | break; | |
215 | ||
216 | case -1: | |
217 | *errptr = string_sprintf("RADIUS: %s", rad_strerror(h)); | |
218 | result = ERROR; | |
219 | break; | |
220 | ||
221 | default: | |
222 | *errptr = string_sprintf("RADIUS: unexpected response (%d)", result); | |
223 | result= ERROR; | |
224 | break; | |
225 | } | |
226 | } | |
227 | ||
228 | if (*errptr != NULL) DEBUG(D_auth) debug_printf("%s\n", *errptr); | |
229 | rad_close(h); | |
230 | return result; | |
231 | ||
232 | #endif /* RADIUS_LIB_RADLIB */ | |
233 | } | |
234 | ||
235 | #endif /* RADIUS_CONFIG_FILE */ | |
236 | ||
237 | /* End of call_radius.c */ |