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;