projects / exim.git / blame
| Commit | Line | Data |
|---|---|---|
| 16ff981e PH |
1 | /************************************************* |
| 2 | * Exim - an Internet mail transport agent * | |
| 3 | *************************************************/ | |
| 4 | ||
| 0a49a7a4 | 5 | /* Copyright (c) University of Cambridge 1995 - 2009 */ |
| 16ff981e PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
| 7 | ||
| 8 | #include "../exim.h" | |
| 9 | ||
| 10 | /* This module contains the function server_condition(), which is used | |
| 11 | by all authenticators. */ | |
| 12 | ||
| 13 | ||
| 14 | /************************************************* | |
| 15 | * Check server_condition * | |
| 16 | *************************************************/ | |
| 17 | ||
| 18 | /* This function is called from the server code of all authenticators. For | |
| 19 | plaintext, it is always called: the argument cannot be empty, because for | |
| 20 | plaintext, setting server_condition is what enables it as a server | |
| 21 | authenticator. For all the other authenticators, this function is called after | |
| 22 | they have authenticated, to enable additional authorization to be done. | |
| 23 | ||
| 24 | Argument: the authenticator's instance block | |
| 25 | ||
| 26 | Returns: | |
| 27 | OK NULL argument, or success | |
| 28 | DEFER couldn't complete the check | |
| 29 | FAIL authentication failed | |
| 30 | */ | |
| 31 | ||
| 32 | int | |
| 33 | auth_check_serv_cond(auth_instance *ablock) | |
| 34 | { | |
| 35 | uschar *cond; | |
| 36 | ||
| 37 | HDEBUG(D_auth) | |
| 38 | { | |
| 39 | int i; | |
| 40 | debug_printf("%s authenticator:\n", ablock->name); | |
| 41 | for (i = 0; i < AUTH_VARS; i++) | |
| 42 | { | |
| 43 | if (auth_vars[i] != NULL) | |
| 44 | debug_printf(" $auth%d = %s\n", i + 1, auth_vars[i]); | |
| 45 | } | |
| 46 | for (i = 1; i <= expand_nmax; i++) | |
| 47 | debug_printf(" $%d = %.*s\n", i, expand_nlength[i], expand_nstring[i]); | |
| 48 | debug_print_string(ablock->server_debug_string); /* customized debug */ | |
| 49 | } | |
| 50 | ||
| 51 | /* For the plaintext authenticator, server_condition is never NULL. For the | |
| 52 | rest, an unset condition lets everything through. */ | |
| 53 | ||
| 54 | if (ablock->server_condition == NULL) return OK; | |
| 55 | cond = expand_string(ablock->server_condition); | |
| 56 | ||
| 57 | HDEBUG(D_auth) | |
| 58 | { | |
| 59 | if (cond == NULL) | |
| 60 | debug_printf("expansion failed: %s\n", expand_string_message); | |
| 61 | else | |
| 62 | debug_printf("expanded string: %s\n", cond); | |
| 63 | } | |
| 64 | ||
| 65 | /* A forced expansion failure causes authentication to fail. Other expansion | |
| 66 | failures yield DEFER, which will cause a temporary error code to be returned to | |
| 67 | the AUTH command. The problem is at the server end, so the client should try | |
| 68 | again later. */ | |
| 69 | ||
| 70 | if (cond == NULL) | |
| 71 | { | |
| 72 | if (expand_string_forcedfail) return FAIL; | |
| 73 | auth_defer_msg = expand_string_message; | |
| 74 | return DEFER; | |
| 75 | } | |
| 76 | ||
| 77 | /* Return FAIL for empty string, "0", "no", and "false"; return OK for | |
| 78 | "1", "yes", and "true"; return DEFER for anything else, with the string | |
| 79 | available as an error text for the user. */ | |
| 80 | ||
| 81 | if (*cond == 0 || | |
| 82 | Ustrcmp(cond, "0") == 0 || | |
| 83 | strcmpic(cond, US"no") == 0 || | |
| 84 | strcmpic(cond, US"false") == 0) | |
| 85 | return FAIL; | |
| 86 | ||
| 87 | if (Ustrcmp(cond, "1") == 0 || | |
| 88 | strcmpic(cond, US"yes") == 0 || | |
| 89 | strcmpic(cond, US"true") == 0) | |
| 90 | return OK; | |
| 91 | ||
| 92 | auth_defer_msg = cond; | |
| 93 | auth_defer_user_msg = string_sprintf(": %s", cond); | |
| 94 | return DEFER; | |
| 95 | } | |
| 96 | ||
| 97 | /* End of check_serv_cond.c */ |