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/* $Cambridge: exim/exim-src/src/spf.c,v 1.6 2005/06/27 15:28:45 tom Exp $ */
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/*************************************************
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* Exim - an Internet mail transport agent *
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*************************************************/
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/* Experimental SPF support.
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Copyright (c) Tom Kistner <tom@duncanthrax.net> 2004
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/* Code for calling spf checks via libspf-alt. Called from acl.c. */
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#ifdef EXPERIMENTAL_SPF
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/* must be kept in numeric order */
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static spf_result_id spf_result_id_list[] = {
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SPF_server_t *spf_server = NULL;
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SPF_request_t *spf_request = NULL;
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SPF_response_t *spf_response = NULL;
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SPF_response_t *spf_response_2mx = NULL;
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/* spf_init sets up a context that can be re-used for several
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messages on the same SMTP connection (that come from the
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same host with the same HELO string) */
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int spf_init(uschar *spf_helo_domain, uschar *spf_remote_addr) {
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spf_server = SPF_server_new(SPF_DNS_CACHE, 0);
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if ( spf_server == NULL ) {
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debug_printf("spf: SPF_server_new() failed.\n");
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spf_request = SPF_request_new(spf_server);
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if (SPF_request_set_ipv4_str(spf_request, spf_remote_addr)) {
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debug_printf("spf: SPF_request_set_ipv4_str() failed.\n");
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if (SPF_request_set_helo_dom(spf_request, spf_helo_domain)) {
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debug_printf("spf: SPF_set_helo_dom() failed.\n");
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/* spf_process adds the envelope sender address to the existing
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context (if any), retrieves the result, sets up expansion
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strings and evaluates the condition outcome. */
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int spf_process(uschar **listptr, uschar *spf_envelope_sender) {
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uschar *list = *listptr;
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uschar *spf_result_id;
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uschar spf_result_id_buffer[128];
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int rc = SPF_RESULT_PERMERROR;
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if (!(spf_server && spf_request)) {
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/* no global context, assume temp error and skip to evaluation */
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rc = SPF_RESULT_PERMERROR;
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if (SPF_request_set_env_from(spf_request, spf_envelope_sender)) {
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/* Invalid sender address. This should be a real rare occurence */
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rc = SPF_RESULT_PERMERROR;
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SPF_request_query_mailfrom(spf_request, &spf_response);
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/* set up expansion items */
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spf_header_comment = (uschar *)SPF_response_get_header_comment(spf_response);
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spf_received = (uschar *)SPF_response_get_received_spf(spf_response);
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spf_result = (uschar *)SPF_strresult(SPF_response_result(spf_response));
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spf_smtp_comment = (uschar *)SPF_response_get_smtp_comment(spf_response);
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rc = SPF_response_result(spf_response);
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/* We got a result. Now see if we should return OK or FAIL for it */
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debug_printf("SPF result is %s (%d)\n", SPF_strresult(rc), rc);
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while ((spf_result_id = string_nextinlist(&list, &sep,
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spf_result_id_buffer,
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sizeof(spf_result_id_buffer))) != NULL) {
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/* Check for negation */
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if (spf_result_id[0] == '!') {
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/* Check the result identifier */
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result = Ustrcmp(spf_result_id, spf_result_id_list[rc].name);
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if (!negate && result==0) return OK;
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if (negate && result!=0) return OK;