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6d06cf48 | 1 | /* $Cambridge: exim/src/src/spf.c,v 1.6 2005/06/27 15:28:45 tom Exp $ */ |
8523533c TK |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
8e669ac1 | 6 | |
8523533c TK |
7 | /* Experimental SPF support. |
8 | Copyright (c) Tom Kistner <tom@duncanthrax.net> 2004 | |
9 | License: GPL */ | |
8e669ac1 | 10 | |
8523533c TK |
11 | /* Code for calling spf checks via libspf-alt. Called from acl.c. */ |
12 | ||
13 | #include "exim.h" | |
14 | #ifdef EXPERIMENTAL_SPF | |
15 | ||
6d06cf48 TK |
16 | /* must be kept in numeric order */ |
17 | static spf_result_id spf_result_id_list[] = { | |
18 | { US"invalid", 0}, | |
19 | { US"neutral", 1 }, | |
20 | { US"pass", 2 }, | |
21 | { US"fail", 3 }, | |
22 | { US"softfail", 4 }, | |
23 | { US"none", 5 }, | |
24 | { US"err_temp", 6 }, | |
25 | { US"err_perm", 7 } | |
26 | }; | |
27 | ||
384152a6 TK |
28 | SPF_server_t *spf_server = NULL; |
29 | SPF_request_t *spf_request = NULL; | |
30 | SPF_response_t *spf_response = NULL; | |
31 | SPF_response_t *spf_response_2mx = NULL; | |
8523533c TK |
32 | |
33 | /* spf_init sets up a context that can be re-used for several | |
34 | messages on the same SMTP connection (that come from the | |
35 | same host with the same HELO string) */ | |
8e669ac1 | 36 | |
8523533c | 37 | int spf_init(uschar *spf_helo_domain, uschar *spf_remote_addr) { |
8e669ac1 | 38 | |
92f1b170 | 39 | spf_server = SPF_server_new(SPF_DNS_CACHE, 0); |
8e669ac1 | 40 | |
384152a6 TK |
41 | if ( spf_server == NULL ) { |
42 | debug_printf("spf: SPF_server_new() failed.\n"); | |
43 | return 0; | |
8523533c TK |
44 | } |
45 | ||
384152a6 | 46 | spf_request = SPF_request_new(spf_server); |
8523533c | 47 | |
384152a6 TK |
48 | if (SPF_request_set_ipv4_str(spf_request, spf_remote_addr)) { |
49 | debug_printf("spf: SPF_request_set_ipv4_str() failed.\n"); | |
50 | spf_server = NULL; | |
51 | spf_request = NULL; | |
52 | return 0; | |
8523533c TK |
53 | } |
54 | ||
384152a6 | 55 | if (SPF_request_set_helo_dom(spf_request, spf_helo_domain)) { |
8523533c | 56 | debug_printf("spf: SPF_set_helo_dom() failed.\n"); |
384152a6 TK |
57 | spf_server = NULL; |
58 | spf_request = NULL; | |
59 | return 0; | |
8523533c | 60 | } |
8e669ac1 | 61 | |
8523533c TK |
62 | return 1; |
63 | } | |
64 | ||
65 | ||
66 | /* spf_process adds the envelope sender address to the existing | |
67 | context (if any), retrieves the result, sets up expansion | |
68 | strings and evaluates the condition outcome. */ | |
69 | ||
70 | int spf_process(uschar **listptr, uschar *spf_envelope_sender) { | |
71 | int sep = 0; | |
72 | uschar *list = *listptr; | |
73 | uschar *spf_result_id; | |
74 | uschar spf_result_id_buffer[128]; | |
384152a6 | 75 | int rc = SPF_RESULT_PERMERROR; |
8e669ac1 | 76 | |
384152a6 | 77 | if (!(spf_server && spf_request)) { |
8523533c | 78 | /* no global context, assume temp error and skip to evaluation */ |
384152a6 | 79 | rc = SPF_RESULT_PERMERROR; |
8523533c TK |
80 | goto SPF_EVALUATE; |
81 | }; | |
82 | ||
384152a6 | 83 | if (SPF_request_set_env_from(spf_request, spf_envelope_sender)) { |
8523533c | 84 | /* Invalid sender address. This should be a real rare occurence */ |
384152a6 | 85 | rc = SPF_RESULT_PERMERROR; |
8523533c | 86 | goto SPF_EVALUATE; |
8e669ac1 | 87 | } |
8523533c TK |
88 | |
89 | /* get SPF result */ | |
384152a6 | 90 | SPF_request_query_mailfrom(spf_request, &spf_response); |
8523533c TK |
91 | |
92 | /* set up expansion items */ | |
384152a6 TK |
93 | spf_header_comment = (uschar *)SPF_response_get_header_comment(spf_response); |
94 | spf_received = (uschar *)SPF_response_get_received_spf(spf_response); | |
95 | spf_result = (uschar *)SPF_strresult(SPF_response_result(spf_response)); | |
96 | spf_smtp_comment = (uschar *)SPF_response_get_smtp_comment(spf_response); | |
8523533c | 97 | |
384152a6 | 98 | rc = SPF_response_result(spf_response); |
8523533c TK |
99 | |
100 | /* We got a result. Now see if we should return OK or FAIL for it */ | |
101 | SPF_EVALUATE: | |
102 | debug_printf("SPF result is %s (%d)\n", SPF_strresult(rc), rc); | |
103 | while ((spf_result_id = string_nextinlist(&list, &sep, | |
104 | spf_result_id_buffer, | |
105 | sizeof(spf_result_id_buffer))) != NULL) { | |
106 | int negate = 0; | |
107 | int result = 0; | |
108 | ||
109 | /* Check for negation */ | |
110 | if (spf_result_id[0] == '!') { | |
111 | negate = 1; | |
112 | spf_result_id++; | |
113 | }; | |
114 | ||
115 | /* Check the result identifier */ | |
116 | result = Ustrcmp(spf_result_id, spf_result_id_list[rc].name); | |
117 | if (!negate && result==0) return OK; | |
118 | if (negate && result!=0) return OK; | |
119 | }; | |
120 | ||
121 | /* no match */ | |
122 | return FAIL; | |
123 | } | |
124 | ||
125 | #endif |