X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/79e5ebf9e9bb833ce004be65c04b2f8eea91c337..HEAD:/src/src/spf.c diff --git a/src/src/spf.c b/src/src/spf.c deleted file mode 100644 index fd9831c43..000000000 --- a/src/src/spf.c +++ /dev/null @@ -1,406 +0,0 @@ -/************************************************* -* Exim - an Internet mail transport agent * -*************************************************/ - -/* SPF support. - Copyright (c) Tom Kistner 2004 - 2014 - License: GPL - Copyright (c) The Exim Maintainers 2015 - 2020 -*/ - -/* 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; - - -void -spf_lib_version_report(FILE * fp) -{ -int maj, min, patch; -SPF_get_lib_version(&maj, &min, &patch); -fprintf(fp, "Library version: spf2: Compile: %d.%d.%d\n", - SPF_LIB_VERSION_MAJOR, SPF_LIB_VERSION_MINOR, SPF_LIB_VERSION_PATCH); -fprintf(fp, " Runtime: %d.%d.%d\n", - maj, min, patch); -} - - - -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; -unsigned found = 0; - -SPF_dns_rr_t srr = { - .domain = CS domain, /* query information */ - .domain_buf_len = 0, - .rr_type = rr_type, - - .rr_buf_len = 0, /* answer information */ - .rr_buf_num = 0, /* no free of s */ - .utc_ttl = 0, - - .hook = NULL, /* misc information */ - .source = spf_dns_server -}; -int dns_rc; - -DEBUG(D_receive) debug_printf("SPF_dns_exim_lookup '%s'\n", domain); - -/* Shortcircuit SPF RR lookups by returning HOST_NOT_FOUND (shortest code path -in libspf2). They were obsoleted by RFC 6686/7208 years ago. see bug #1294 -*/ - -if (rr_type == T_SPF) - { - HDEBUG(D_host_lookup) debug_printf("faking HOST_NOT_FOUND for SPF RR(99) lookup\n"); - srr.herrno = HOST_NOT_FOUND; - SPF_dns_rr_dup(&spfrr, &srr); - return spfrr; - } - -switch (dns_rc = dns_lookup(dnsa, US domain, rr_type, NULL)) - { - case DNS_SUCCEED: srr.herrno = NETDB_SUCCESS; break; - case DNS_AGAIN: srr.herrno = TRY_AGAIN; break; - case DNS_NOMATCH: srr.herrno = HOST_NOT_FOUND; break; - case DNS_NODATA: srr.herrno = NO_DATA; break; - case DNS_FAIL: - default: srr.herrno = NO_RECOVERY; break; - } - -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) found++; - -if (found == 0) - { - SPF_dns_rr_dup(&spfrr, &srr); - return spfrr; - } - -srr.rr = store_malloc(sizeof(SPF_dns_rr_data_t) * found); - -found = 0; -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) - { - const uschar * s = rr->data; - - srr.ttl = rr->ttl; - switch(rr_type) - { - case T_MX: - s += 2; /* skip the MX precedence field */ - case T_PTR: - { - uschar * buf = store_malloc(256); - (void)dn_expand(dnsa->answer, dnsa->answer + dnsa->answerlen, s, - (DN_EXPAND_ARG4_TYPE)buf, 256); - s = buf; - break; - } - - case T_TXT: - { - gstring * g = NULL; - uschar chunk_len; - - if (strncmpic(rr->data+1, US SPF_VER_STR, 6) != 0) - { - HDEBUG(D_host_lookup) debug_printf("not an spf record: %.*s\n", - (int) s[0], s+1); - continue; - } - - for (int off = 0; off < rr->size; off += chunk_len) - { - if (!(chunk_len = s[off++])) break; - g = string_catn(g, s+off, chunk_len); - } - if (!g) - continue; - gstring_release_unused(g); - s = string_copy_malloc(string_from_gstring(g)); - DEBUG(D_receive) debug_printf("SPF_dns_exim_lookup '%s'\n", s); - break; - } - - case T_A: - case T_AAAA: - default: - { - uschar * buf = store_malloc(dnsa->answerlen + 1); - s = memcpy(buf, s, dnsa->answerlen + 1); - break; - } - } - srr.rr[found++] = (void *) s; - } - -/* Did we filter out all TXT RRs? Return NO_DATA instead of SUCCESS with -empty ANSWER section. */ - -if (!(srr.num_rr = found)) - srr.herrno = NO_DATA; - -/* spfrr->rr must have been malloc()d for this */ -SPF_dns_rr_dup(&spfrr, &srr); -return spfrr; -} - - - -SPF_dns_server_t * -SPF_dns_exim_new(int debug) -{ -SPF_dns_server_t * spf_dns_server = store_malloc(sizeof(SPF_dns_server_t)); - -DEBUG(D_receive) debug_printf("SPF_dns_exim_new\n"); - -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; -} - - - - -/* Construct the SPF library stack. - Return: Boolean success. -*/ - -BOOL -spf_init(void) -{ -SPF_dns_server_t * dc; -int debug = 0; - -DEBUG(D_receive) 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; - } - /* Quick hack to override the outdated explanation URL. - See https://www.mail-archive.com/mailop@mailop.org/msg08019.html */ - SPF_server_set_explanation(spf_server, "Please%_see%_http://www.open-spf.org/Why?id=%{S}&ip=%{C}&receiver=%{R}", &spf_response); - if (SPF_response_errcode(spf_response) != SPF_E_SUCCESS) - log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", SPF_strerror(SPF_response_errcode(spf_response))); - -return TRUE; -} - - -/* Set 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). - -Return: Boolean success -*/ - -BOOL -spf_conn_init(uschar * spf_helo_domain, uschar * spf_remote_addr) -{ -DEBUG(D_receive) - debug_printf("spf_conn_init: %s %s\n", spf_helo_domain, spf_remote_addr); - -if (!spf_server && !spf_init()) 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; -} - - -void -spf_response_debug(SPF_response_t * spf_response) -{ -if (SPF_response_messages(spf_response) == 0) - debug_printf(" (no errors)\n"); -else for (int i = 0; i < SPF_response_messages(spf_response); i++) - { - SPF_error_t * err = SPF_response_message(spf_response, i); - debug_printf( "%s_msg = (%d) %s\n", - (SPF_error_errorp(err) ? "warn" : "err"), - SPF_error_code(err), - SPF_error_message(err)); - } -} - - -/* 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); - - DEBUG(D_acl) spf_response_debug(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