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c988f1f4 | 1 | /* $Cambridge: exim/src/src/auths/call_radius.c,v 1.2 2005/01/04 10:00:43 ph10 Exp $ */ |
0756eb3c PH |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
c988f1f4 | 7 | /* Copyright (c) University of Cambridge 1995 - 2005 */ |
0756eb3c PH |
8 | /* See the file NOTICE for conditions of use and distribution. */ |
9 | ||
10 | /* This file was originally supplied by Ian Kirk. The libradius support came | |
11 | from Alex Kiernan. */ | |
12 | ||
13 | #include "../exim.h" | |
14 | ||
15 | /* This module contains functions that call the Radius authentication | |
16 | mechanism. | |
17 | ||
18 | We can't just compile this code and allow the library mechanism to omit the | |
19 | functions if they are not wanted, because we need to have the Radius headers | |
20 | available for compiling. Therefore, compile these functions only if | |
21 | RADIUS_CONFIG_FILE is defined. However, some compilers don't like compiling | |
22 | empty modules, so keep them happy with a dummy when skipping the rest. Make it | |
23 | reference itself to stop picky compilers complaining that it is unused, and put | |
24 | in a dummy argument to stop even pickier compilers complaining about infinite | |
25 | loops. */ | |
26 | ||
27 | #ifndef RADIUS_CONFIG_FILE | |
28 | static void dummy(int x) { dummy(x-1); } | |
29 | #else /* RADIUS_CONFIG_FILE */ | |
30 | ||
31 | ||
32 | /* Two different Radius libraries are supported. The default is radiusclient. */ | |
33 | ||
34 | #ifdef RADIUS_LIB_RADLIB | |
35 | #include <radlib.h> | |
36 | #else | |
37 | #ifndef RADIUS_LIB_RADIUSCLIENT | |
38 | #define RADIUS_LIB_RADIUSCLIENT | |
39 | #endif | |
40 | #include <radiusclient.h> | |
41 | #endif | |
42 | ||
43 | ||
44 | ||
45 | /************************************************* | |
46 | * Perform RADIUS authentication * | |
47 | *************************************************/ | |
48 | ||
49 | /* This function calls the Radius authentication mechanism, passing over one or | |
50 | more data strings. | |
51 | ||
52 | Arguments: | |
53 | s a colon-separated list of strings | |
54 | errptr where to point an error message | |
55 | ||
56 | Returns: OK if authentication succeeded | |
57 | FAIL if authentication failed | |
58 | ERROR some other error condition | |
59 | */ | |
60 | ||
61 | int | |
62 | auth_call_radius(uschar *s, uschar **errptr) | |
63 | { | |
64 | uschar *user; | |
65 | uschar *radius_args = s; | |
66 | int result; | |
67 | int sep = 0; | |
68 | ||
69 | #ifdef RADIUS_LIB_RADLIB | |
70 | struct rad_handle *h; | |
71 | #else | |
72 | VALUE_PAIR *send = NULL; | |
73 | VALUE_PAIR *received; | |
74 | unsigned int service = PW_AUTHENTICATE_ONLY; | |
75 | char msg[4096]; | |
76 | #endif | |
77 | ||
78 | ||
79 | user = string_nextinlist(&radius_args, &sep, big_buffer, big_buffer_size); | |
80 | if (user == NULL) user = US""; | |
81 | ||
82 | DEBUG(D_auth) debug_printf("Running RADIUS authentication for user \"%s\" " | |
83 | "and \"%s\"\n", user, radius_args); | |
84 | ||
85 | *errptr = NULL; | |
86 | ||
87 | ||
88 | /* Authenticate using the radiusclient library */ | |
89 | ||
90 | #ifdef RADIUS_LIB_RADIUSCLIENT | |
91 | ||
92 | rc_openlog("exim"); | |
93 | ||
94 | if (rc_read_config(RADIUS_CONFIG_FILE) != 0) | |
95 | *errptr = string_sprintf("RADIUS: can't open %s", RADIUS_CONFIG_FILE); | |
96 | ||
97 | else if (rc_read_dictionary(rc_conf_str("dictionary")) != 0) | |
98 | *errptr = string_sprintf("RADIUS: can't read dictionary"); | |
99 | ||
100 | else if (rc_avpair_add(&send, PW_USER_NAME, user, 0) == NULL) | |
101 | *errptr = string_sprintf("RADIUS: add user name failed\n"); | |
102 | ||
103 | else if (rc_avpair_add(&send, PW_USER_PASSWORD, CS radius_args, 0) == NULL) | |
104 | *errptr = string_sprintf("RADIUS: add password failed\n"); | |
105 | ||
106 | else if (rc_avpair_add(&send, PW_SERVICE_TYPE, &service, 0) == NULL) | |
107 | *errptr = string_sprintf("RADIUS: add service type failed\n"); | |
108 | ||
109 | if (*errptr != NULL) | |
110 | { | |
111 | DEBUG(D_auth) debug_printf("%s\n", *errptr); | |
112 | return ERROR; | |
113 | } | |
114 | ||
115 | result = rc_auth(0, send, &received, msg); | |
116 | DEBUG(D_auth) debug_printf("RADIUS code returned %d\n", result); | |
117 | ||
118 | switch (result) | |
119 | { | |
120 | case OK_RC: | |
121 | return OK; | |
122 | ||
123 | case ERROR_RC: | |
124 | return FAIL; | |
125 | ||
126 | case TIMEOUT_RC: | |
127 | *errptr = US"RADIUS: timed out"; | |
128 | return ERROR; | |
129 | ||
130 | default: | |
131 | case BADRESP_RC: | |
132 | *errptr = string_sprintf("RADIUS: unexpected response (%d)", result); | |
133 | return ERROR; | |
134 | } | |
135 | ||
136 | #else /* RADIUS_LIB_RADIUSCLIENT not set => RADIUS_LIB_RADLIB is set */ | |
137 | ||
138 | /* Authenticate using the libradius library */ | |
139 | ||
140 | h = rad_auth_open(); | |
141 | if (h == NULL) | |
142 | { | |
143 | *errptr = string_sprintf("RADIUS: can't initialise libradius"); | |
144 | return ERROR; | |
145 | } | |
146 | if (rad_config(h, RADIUS_CONFIG_FILE) != 0 || | |
147 | rad_create_request(h, RAD_ACCESS_REQUEST) != 0 || | |
148 | rad_put_string(h, RAD_USER_NAME, CS user) != 0 || | |
149 | rad_put_string(h, RAD_USER_PASSWORD, CS radius_args) != 0 || | |
150 | rad_put_int(h, RAD_SERVICE_TYPE, RAD_AUTHENTICATE_ONLY) != 0) | |
151 | { | |
152 | *errptr = string_sprintf("RADIUS: %s", rad_strerror(h)); | |
153 | result = ERROR; | |
154 | } | |
155 | else | |
156 | { | |
157 | result = rad_send_request(h); | |
158 | ||
159 | switch(result) | |
160 | { | |
161 | case RAD_ACCESS_ACCEPT: | |
162 | result = OK; | |
163 | break; | |
164 | ||
165 | case RAD_ACCESS_REJECT: | |
166 | result = FAIL; | |
167 | break; | |
168 | ||
169 | case -1: | |
170 | *errptr = string_sprintf("RADIUS: %s", rad_strerror(h)); | |
171 | result = ERROR; | |
172 | break; | |
173 | ||
174 | default: | |
175 | *errptr = string_sprintf("RADIUS: unexpected response (%d)", result); | |
176 | result= ERROR; | |
177 | break; | |
178 | } | |
179 | } | |
180 | ||
181 | if (*errptr != NULL) DEBUG(D_auth) debug_printf("%s\n", *errptr); | |
182 | rad_close(h); | |
183 | return result; | |
184 | ||
185 | #endif /* RADIUS_LIB_RADLIB */ | |
186 | } | |
187 | ||
188 | #endif /* RADIUS_CONFIG_FILE */ | |
189 | ||
190 | /* End of call_radius.c */ |