| 1 | /************************************************* |
| 2 | * Exim - an Internet mail transport agent * |
| 3 | *************************************************/ |
| 4 | |
| 5 | /* Copyright (c) University of Cambridge 1995 - 2016 */ |
| 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 | |
| 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 | |
| 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 |
| 33 | loops. Then use a mutually-recursive pair as gcc is just getting stupid. */ |
| 34 | |
| 35 | #ifndef RADIUS_CONFIG_FILE |
| 36 | static void dummy(int x); |
| 37 | static void dummy2(int x) { dummy(x-1); } |
| 38 | static void dummy(int x) { dummy2(x-1); } |
| 39 | #else /* RADIUS_CONFIG_FILE */ |
| 40 | |
| 41 | |
| 42 | /* Two different Radius libraries are supported. The default is radiusclient, |
| 43 | using its original API. At release 0.4.0 the API changed. */ |
| 44 | |
| 45 | #ifdef RADIUS_LIB_RADLIB |
| 46 | #include <radlib.h> |
| 47 | #else |
| 48 | #if !defined(RADIUS_LIB_RADIUSCLIENT) && !defined(RADIUS_LIB_RADIUSCLIENTNEW) |
| 49 | # define RADIUS_LIB_RADIUSCLIENT |
| 50 | #endif |
| 51 | |
| 52 | #ifdef RADIUS_LIB_RADIUSCLIENTNEW |
| 53 | # include <freeradius-client.h> |
| 54 | #else |
| 55 | # include <radiusclient.h> |
| 56 | #endif |
| 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 |
| 78 | auth_call_radius(const uschar *s, uschar **errptr) |
| 79 | { |
| 80 | uschar *user; |
| 81 | const uschar *radius_args = s; |
| 82 | int result; |
| 83 | int sep = 0; |
| 84 | |
| 85 | #ifdef RADIUS_LIB_RADLIB |
| 86 | struct rad_handle *h; |
| 87 | #else |
| 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]; |
| 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 | |
| 109 | #ifndef RADIUS_LIB_RADLIB |
| 110 | |
| 111 | rc_openlog("exim"); |
| 112 | |
| 113 | #ifdef RADIUS_LIB_RADIUSCLIENT |
| 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 | |
| 129 | #else /* RADIUS_LIB_RADIUSCLIENT unset => RADIUS_LIB_RADIUSCLIENT2 */ |
| 130 | |
| 131 | if ((h = rc_read_config(RADIUS_CONFIG_FILE)) == NULL) |
| 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 | |
| 137 | else if (rc_avpair_add(h, &send, PW_USER_NAME, user, Ustrlen(user), 0) == NULL) |
| 138 | *errptr = string_sprintf("RADIUS: add user name failed\n"); |
| 139 | |
| 140 | else if (rc_avpair_add(h, &send, PW_USER_PASSWORD, CS radius_args, |
| 141 | Ustrlen(radius_args), 0) == NULL) |
| 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 | |
| 149 | if (*errptr != NULL) |
| 150 | { |
| 151 | DEBUG(D_auth) debug_printf("%s\n", *errptr); |
| 152 | return ERROR; |
| 153 | } |
| 154 | |
| 155 | #ifdef RADIUS_LIB_RADIUSCLIENT |
| 156 | result = rc_auth(0, send, &received, msg); |
| 157 | #else |
| 158 | result = rc_auth(h, 0, send, &received, msg); |
| 159 | #endif |
| 160 | |
| 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 | |
| 168 | case REJECT_RC: |
| 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 | |
| 182 | #else /* RADIUS_LIB_RADLIB is set */ |
| 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 || |
| 196 | rad_put_int(h, RAD_SERVICE_TYPE, RAD_AUTHENTICATE_ONLY) != 0 || |
| 197 | rad_put_string(h, RAD_NAS_IDENTIFIER, CS primary_hostname) != 0) |
| 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 */ |