| 1 | /* $Cambridge: exim/src/src/auths/call_radius.c,v 1.1 2004/10/07 13:10:01 ph10 Exp $ */ |
| 2 | |
| 3 | /************************************************* |
| 4 | * Exim - an Internet mail transport agent * |
| 5 | *************************************************/ |
| 6 | |
| 7 | /* Copyright (c) University of Cambridge 1995 - 2004 */ |
| 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 */ |