1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Experimental SPF support.
6 Copyright (c) Tom Kistner <tom@duncanthrax.net> 2004 - 2014
9 /* Code for calling spf checks via libspf-alt. Called from acl.c. */
12 #ifdef EXPERIMENTAL_SPF
14 /* must be kept in numeric order */
15 static spf_result_id spf_result_id_list
[] = {
22 { US
"err_temp", 6 }, /* Deprecated Apr 2014 */
23 { US
"err_perm", 7 }, /* Deprecated Apr 2014 */
24 { US
"temperror", 6 }, /* RFC 4408 defined */
25 { US
"permerror", 7 } /* RFC 4408 defined */
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
, CS primary_hostname
)) {
47 debug_printf("spf: SPF_server_set_rec_dom(\"%s\") failed.\n", primary_hostname
);
52 spf_request
= SPF_request_new(spf_server
);
54 if (SPF_request_set_ipv4_str(spf_request
, CS spf_remote_addr
)
55 && SPF_request_set_ipv6_str(spf_request
, CS spf_remote_addr
)) {
56 debug_printf("spf: SPF_request_set_ipv4_str() and SPF_request_set_ipv6_str() failed [%s]\n", spf_remote_addr
);
62 if (SPF_request_set_helo_dom(spf_request
, CS spf_helo_domain
)) {
63 debug_printf("spf: SPF_set_helo_dom(\"%s\") failed.\n", spf_helo_domain
);
73 /* spf_process adds the envelope sender address to the existing
74 context (if any), retrieves the result, sets up expansion
75 strings and evaluates the condition outcome. */
77 int spf_process(const uschar
**listptr
, uschar
*spf_envelope_sender
, int action
) {
79 const uschar
*list
= *listptr
;
80 uschar
*spf_result_id
;
81 uschar spf_result_id_buffer
[128];
82 int rc
= SPF_RESULT_PERMERROR
;
84 if (!(spf_server
&& spf_request
)) {
85 /* no global context, assume temp error and skip to evaluation */
86 rc
= SPF_RESULT_PERMERROR
;
90 if (SPF_request_set_env_from(spf_request
, CS spf_envelope_sender
)) {
91 /* Invalid sender address. This should be a real rare occurence */
92 rc
= SPF_RESULT_PERMERROR
;
97 if (action
== SPF_PROCESS_FALLBACK
)
98 SPF_request_query_fallback(spf_request
, &spf_response
, CS spf_guess
);
100 SPF_request_query_mailfrom(spf_request
, &spf_response
);
102 /* set up expansion items */
103 spf_header_comment
= (uschar
*)SPF_response_get_header_comment(spf_response
);
104 spf_received
= (uschar
*)SPF_response_get_received_spf(spf_response
);
105 spf_result
= (uschar
*)SPF_strresult(SPF_response_result(spf_response
));
106 spf_smtp_comment
= (uschar
*)SPF_response_get_smtp_comment(spf_response
);
108 rc
= SPF_response_result(spf_response
);
110 /* We got a result. Now see if we should return OK or FAIL for it */
112 debug_printf("SPF result is %s (%d)\n", SPF_strresult(rc
), rc
);
114 if (action
== SPF_PROCESS_GUESS
&& (!strcmp (SPF_strresult(rc
), "none")))
115 return spf_process(listptr
, spf_envelope_sender
, SPF_PROCESS_FALLBACK
);
117 while ((spf_result_id
= string_nextinlist(&list
, &sep
,
118 spf_result_id_buffer
,
119 sizeof(spf_result_id_buffer
))) != NULL
) {
123 /* Check for negation */
124 if (spf_result_id
[0] == '!') {
129 /* Check the result identifier */
130 result
= Ustrcmp(spf_result_id
, spf_result_id_list
[rc
].name
);
131 if (!negate
&& result
==0) return OK
;
132 if (negate
&& result
!=0) return OK
;