1 /* $Cambridge: exim/src/src/spf.c,v 1.7 2007/05/17 19:55:10 tom Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Experimental SPF support.
8 Copyright (c) Tom Kistner <tom@duncanthrax.net> 2004
11 /* Code for calling spf checks via libspf-alt. Called from acl.c. */
14 #ifdef EXPERIMENTAL_SPF
16 /* must be kept in numeric order */
17 static spf_result_id spf_result_id_list
[] = {
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
;
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) */
37 int spf_init(uschar
*spf_helo_domain
, uschar
*spf_remote_addr
) {
39 spf_server
= SPF_server_new(SPF_DNS_CACHE
, 0);
41 if ( spf_server
== NULL
) {
42 debug_printf("spf: SPF_server_new() failed.\n");
46 if (SPF_server_set_rec_dom(spf_server
, primary_hostname
)) {
47 debug_printf("spf: SPF_server_set_rec_dom() failed.\n");
52 spf_request
= SPF_request_new(spf_server
);
54 if (SPF_request_set_ipv4_str(spf_request
, spf_remote_addr
)) {
55 debug_printf("spf: SPF_request_set_ipv4_str() failed.\n");
61 if (SPF_request_set_helo_dom(spf_request
, spf_helo_domain
)) {
62 debug_printf("spf: SPF_set_helo_dom() failed.\n");
72 /* spf_process adds the envelope sender address to the existing
73 context (if any), retrieves the result, sets up expansion
74 strings and evaluates the condition outcome. */
76 int spf_process(uschar
**listptr
, uschar
*spf_envelope_sender
) {
78 uschar
*list
= *listptr
;
79 uschar
*spf_result_id
;
80 uschar spf_result_id_buffer
[128];
81 int rc
= SPF_RESULT_PERMERROR
;
83 if (!(spf_server
&& spf_request
)) {
84 /* no global context, assume temp error and skip to evaluation */
85 rc
= SPF_RESULT_PERMERROR
;
89 if (SPF_request_set_env_from(spf_request
, spf_envelope_sender
)) {
90 /* Invalid sender address. This should be a real rare occurence */
91 rc
= SPF_RESULT_PERMERROR
;
96 SPF_request_query_mailfrom(spf_request
, &spf_response
);
98 /* set up expansion items */
99 spf_header_comment
= (uschar
*)SPF_response_get_header_comment(spf_response
);
100 spf_received
= (uschar
*)SPF_response_get_received_spf(spf_response
);
101 spf_result
= (uschar
*)SPF_strresult(SPF_response_result(spf_response
));
102 spf_smtp_comment
= (uschar
*)SPF_response_get_smtp_comment(spf_response
);
104 rc
= SPF_response_result(spf_response
);
106 /* We got a result. Now see if we should return OK or FAIL for it */
108 debug_printf("SPF result is %s (%d)\n", SPF_strresult(rc
), rc
);
109 while ((spf_result_id
= string_nextinlist(&list
, &sep
,
110 spf_result_id_buffer
,
111 sizeof(spf_result_id_buffer
))) != NULL
) {
115 /* Check for negation */
116 if (spf_result_id
[0] == '!') {
121 /* Check the result identifier */
122 result
= Ustrcmp(spf_result_id
, spf_result_id_list
[rc
].name
);
123 if (!negate
&& result
==0) return OK
;
124 if (negate
&& result
!=0) return OK
;