X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/8743d3acaaa2262007aa2862ffecd6b19125e38d..HEAD:/src/src/spf.c diff --git a/src/src/spf.c b/src/src/spf.c deleted file mode 100644 index 8b7bf4bc9..000000000 --- a/src/src/spf.c +++ /dev/null @@ -1,295 +0,0 @@ -/************************************************* -* Exim - an Internet mail transport agent * -*************************************************/ - -/* SPF support. - Copyright (c) Tom Kistner 2004 - 2014 - License: GPL - Copyright (c) The Exim Maintainers 2015 - 2019 -*/ - -/* Code for calling spf checks via libspf-alt. Called from acl.c. */ - -#include "exim.h" -#ifdef SUPPORT_SPF - -/* must be kept in numeric order */ -static spf_result_id spf_result_id_list[] = { - /* name value */ - { US"invalid", 0}, - { US"neutral", 1 }, - { US"pass", 2 }, - { US"fail", 3 }, - { US"softfail", 4 }, - { US"none", 5 }, - { US"temperror", 6 }, /* RFC 4408 defined */ - { US"permerror", 7 } /* RFC 4408 defined */ -}; - -SPF_server_t *spf_server = NULL; -SPF_request_t *spf_request = NULL; -SPF_response_t *spf_response = NULL; -SPF_response_t *spf_response_2mx = NULL; - -SPF_dns_rr_t * spf_nxdomain = NULL; - - - -static SPF_dns_rr_t * -SPF_dns_exim_lookup(SPF_dns_server_t *spf_dns_server, -const char *domain, ns_type rr_type, int should_cache) -{ -dns_answer * dnsa = store_get_dns_answer(); -dns_scan dnss; -SPF_dns_rr_t * spfrr; - -DEBUG(D_receive) debug_printf("SPF_dns_exim_lookup\n"); - -if (dns_lookup(dnsa, US domain, rr_type, NULL) == DNS_SUCCEED) - for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr; - rr = dns_next_rr(dnsa, &dnss, RESET_NEXT)) - if ( rr->type == rr_type - && Ustrncmp(rr->data+1, "v=spf1", 6) == 0) - { - gstring * g = NULL; - uschar chunk_len; - uschar * s; - SPF_dns_rr_t srr = { - .domain = CS rr->name, /* query information */ - .domain_buf_len = DNS_MAXNAME, - .rr_type = rr->type, - - .num_rr = 1, /* answer information */ - .rr = NULL, - .rr_buf_len = 0, - .rr_buf_num = 0, - .ttl = rr->ttl, - .utc_ttl = 0, - .herrno = NETDB_SUCCESS, - - .hook = NULL, /* misc information */ - .source = spf_dns_server - }; - - for (int off = 0; off < rr->size; off += chunk_len) - { - chunk_len = (rr->data)[off++]; - g = string_catn(g, US ((rr->data)+off), chunk_len); - } - if (!g) - { - HDEBUG(D_host_lookup) debug_printf("IP address lookup yielded an " - "empty name: treated as non-existent host name\n"); - continue; - } - gstring_release_unused(g); - s = string_copy_malloc(string_from_gstring(g)); - srr.rr = (void *) &s; - - /* spfrr->rr must have been malloc()d for this */ - SPF_dns_rr_dup(&spfrr, &srr); - - return spfrr; - } - -SPF_dns_rr_dup(&spfrr, spf_nxdomain); -return spfrr; -} - - - -SPF_dns_server_t * -SPF_dns_exim_new(int debug) -{ -SPF_dns_server_t *spf_dns_server; - -DEBUG(D_receive) debug_printf("SPF_dns_exim_new\n"); - -if (!(spf_dns_server = malloc(sizeof(SPF_dns_server_t)))) - return NULL; -memset(spf_dns_server, 0, sizeof(SPF_dns_server_t)); - -spf_dns_server->destroy = NULL; -spf_dns_server->lookup = SPF_dns_exim_lookup; -spf_dns_server->get_spf = NULL; -spf_dns_server->get_exp = NULL; -spf_dns_server->add_cache = NULL; -spf_dns_server->layer_below = NULL; -spf_dns_server->name = "exim"; -spf_dns_server->debug = debug; - -/* XXX This might have to return NO_DATA sometimes. */ - -spf_nxdomain = SPF_dns_rr_new_init(spf_dns_server, - "", ns_t_any, 24 * 60 * 60, HOST_NOT_FOUND); -if (!spf_nxdomain) - { - free(spf_dns_server); - return NULL; - } - -return spf_dns_server; -} - - - -/* spf_init sets up a context that can be re-used for several - messages on the same SMTP connection (that come from the - same host with the same HELO string). -XXX the spf_server layer could usefully be separately init'd -given that it sets up a dns cache. - -Return: Boolean success */ - -BOOL -spf_init(uschar *spf_helo_domain, uschar *spf_remote_addr) -{ -int debug = 0; -SPF_dns_server_t * dc; - -DEBUG(D_receive) - { - debug_printf("spf_init: %s %s\n", spf_helo_domain, spf_remote_addr); - debug = 1; - } - -/* We insert our own DNS access layer rather than letting the spf library -do it, so that our dns access path is used for debug tracing and for the -testsuite. */ - -if (!(dc = SPF_dns_exim_new(debug))) - { - DEBUG(D_receive) debug_printf("spf: SPF_dns_exim_new() failed\n"); - return FALSE; - } -if (!(dc = SPF_dns_cache_new(dc, NULL, debug, 8))) - { - DEBUG(D_receive) debug_printf("spf: SPF_dns_cache_new() failed\n"); - return FALSE; - } -if (!(spf_server = SPF_server_new_dns(dc, debug))) - { - DEBUG(D_receive) debug_printf("spf: SPF_server_new() failed.\n"); - return FALSE; - } - -if (SPF_server_set_rec_dom(spf_server, CS primary_hostname)) - { - DEBUG(D_receive) debug_printf("spf: SPF_server_set_rec_dom(\"%s\") failed.\n", - primary_hostname); - spf_server = NULL; - return FALSE; - } - -spf_request = SPF_request_new(spf_server); - -if ( SPF_request_set_ipv4_str(spf_request, CS spf_remote_addr) - && SPF_request_set_ipv6_str(spf_request, CS spf_remote_addr) - ) - { - DEBUG(D_receive) - debug_printf("spf: SPF_request_set_ipv4_str() and " - "SPF_request_set_ipv6_str() failed [%s]\n", spf_remote_addr); - spf_server = NULL; - spf_request = NULL; - return FALSE; - } - -if (SPF_request_set_helo_dom(spf_request, CS spf_helo_domain)) - { - DEBUG(D_receive) debug_printf("spf: SPF_set_helo_dom(\"%s\") failed.\n", - spf_helo_domain); - spf_server = NULL; - spf_request = NULL; - return FALSE; - } - -return TRUE; -} - - -/* spf_process adds the envelope sender address to the existing - context (if any), retrieves the result, sets up expansion - strings and evaluates the condition outcome. - -Return: OK/FAIL */ - -int -spf_process(const uschar **listptr, uschar *spf_envelope_sender, int action) -{ -int sep = 0; -const uschar *list = *listptr; -uschar *spf_result_id; -int rc = SPF_RESULT_PERMERROR; - -DEBUG(D_receive) debug_printf("spf_process\n"); - -if (!(spf_server && spf_request)) - /* no global context, assume temp error and skip to evaluation */ - rc = SPF_RESULT_PERMERROR; - -else if (SPF_request_set_env_from(spf_request, CS spf_envelope_sender)) - /* Invalid sender address. This should be a real rare occurrence */ - rc = SPF_RESULT_PERMERROR; - -else - { - /* get SPF result */ - if (action == SPF_PROCESS_FALLBACK) - { - SPF_request_query_fallback(spf_request, &spf_response, CS spf_guess); - spf_result_guessed = TRUE; - } - else - SPF_request_query_mailfrom(spf_request, &spf_response); - - /* set up expansion items */ - spf_header_comment = US SPF_response_get_header_comment(spf_response); - spf_received = US SPF_response_get_received_spf(spf_response); - spf_result = US SPF_strresult(SPF_response_result(spf_response)); - spf_smtp_comment = US SPF_response_get_smtp_comment(spf_response); - - rc = SPF_response_result(spf_response); - } - -/* We got a result. Now see if we should return OK or FAIL for it */ -DEBUG(D_acl) debug_printf("SPF result is %s (%d)\n", SPF_strresult(rc), rc); - -if (action == SPF_PROCESS_GUESS && (!strcmp (SPF_strresult(rc), "none"))) - return spf_process(listptr, spf_envelope_sender, SPF_PROCESS_FALLBACK); - -while ((spf_result_id = string_nextinlist(&list, &sep, NULL, 0))) - { - BOOL negate, result; - - if ((negate = spf_result_id[0] == '!')) - spf_result_id++; - - result = Ustrcmp(spf_result_id, spf_result_id_list[rc].name) == 0; - if (negate != result) return OK; - } - -/* no match */ -return FAIL; -} - - - -gstring * -authres_spf(gstring * g) -{ -uschar * s; -if (!spf_result) return g; - -g = string_append(g, 2, US";\n\tspf=", spf_result); -if (spf_result_guessed) - g = string_cat(g, US" (best guess record for domain)"); - -s = expand_string(US"$sender_address_domain"); -return s && *s - ? string_append(g, 2, US" smtp.mailfrom=", s) - : string_cat(g, US" smtp.mailfrom=<>"); -} - - -#endif