* Exim - an Internet mail transport agent *
*************************************************/
/* Experimental DMARC support.
- Copyright (c) Todd Lyons <tlyons@exim.org> 2012, 2013
+ Copyright (c) Todd Lyons <tlyons@exim.org> 2012 - 2014
License: GPL */
/* Portions Copyright (c) 2012, 2013, The Trusted Domain Project;
#include "exim.h"
#ifdef EXPERIMENTAL_DMARC
-#if !defined EXPERIMENTAL_SPF
-#error SPF must also be enabled for DMARC
-#elif defined DISABLE_DKIM
-#error DKIM must also be enabled for DMARC
-#else
+# if !defined EXPERIMENTAL_SPF
+# error SPF must also be enabled for DMARC
+# elif defined DISABLE_DKIM
+# error DKIM must also be enabled for DMARC
+# else
-#include "functions.h"
-#include "dmarc.h"
-#include "pdkim/pdkim.h"
+# include "functions.h"
+# include "dmarc.h"
+# include "pdkim/pdkim.h"
OPENDMARC_LIB_T dmarc_ctx;
DMARC_POLICY_T *dmarc_pctx = NULL;
extern pdkim_signature *dkim_signatures;
header_line *from_header = NULL;
extern SPF_response_t *spf_response;
-int dmarc_spf_result = 0;
+int dmarc_spf_ares_result = 0;
uschar *spf_sender_domain = NULL;
uschar *spf_human_readable = NULL;
u_char *header_from_sender = NULL;
int history_file_status = DMARC_HIST_OK;
uschar *dkim_history_buffer= NULL;
+typedef struct dmarc_exim_p {
+ uschar *name;
+ int value;
+} dmarc_exim_p;
+
+static dmarc_exim_p dmarc_policy_description[] = {
+ /* name value */
+ { US"", DMARC_RECORD_P_UNSPECIFIED },
+ { US"none", DMARC_RECORD_P_NONE },
+ { US"quarantine", DMARC_RECORD_P_QUARANTINE },
+ { US"reject", DMARC_RECORD_P_REJECT },
+ { NULL, 0 }
+};
/* Accept an error_block struct, initialize if empty, parse to the
* end, and append the two strings passed to it. Used for adding
* variable amounts of value:pair data to the forensic emails. */
static error_block *
add_to_eblock(error_block *eblock, uschar *t1, uschar *t2)
{
- error_block *eb = malloc(sizeof(error_block));
- if (eblock == NULL)
- eblock = eb;
- else
+error_block *eb = store_malloc(sizeof(error_block));
+if (eblock == NULL)
+ eblock = eb;
+else
{
- /* Find the end of the eblock struct and point it at eb */
- error_block *tmp = eblock;
- while(tmp->next != NULL)
- tmp = tmp->next;
- tmp->next = eb;
+ /* Find the end of the eblock struct and point it at eb */
+ error_block *tmp = eblock;
+ while(tmp->next != NULL)
+ tmp = tmp->next;
+ tmp->next = eb;
}
- eb->text1 = t1;
- eb->text2 = t2;
- eb->next = NULL;
- return eblock;
+eb->text1 = t1;
+eb->text2 = t2;
+eb->next = NULL;
+return eblock;
}
/* dmarc_init sets up a context that can be re-used for several
int dmarc_init()
{
- int *netmask = NULL; /* Ignored */
- int is_ipv6 = 0;
- char *tld_file = (dmarc_tld_file == NULL) ?
- "/etc/exim/opendmarc.tlds" :
- (char *)dmarc_tld_file;
-
- /* Set some sane defaults. Also clears previous results when
- * multiple messages in one connection. */
- dmarc_pctx = NULL;
- dmarc_status = US"none";
- dmarc_abort = FALSE;
- dmarc_pass_fail = US"skipped";
- dmarc_used_domain = US"";
- header_from_sender = NULL;
- spf_sender_domain = NULL;
- spf_human_readable = NULL;
-
- /* ACLs have "control=dmarc_disable_verify" */
- if (dmarc_disable_verify == TRUE)
- return OK;
-
- (void) memset(&dmarc_ctx, '\0', sizeof dmarc_ctx);
- dmarc_ctx.nscount = 0;
- libdm_status = opendmarc_policy_library_init(&dmarc_ctx);
- if (libdm_status != DMARC_PARSE_OKAY)
+int *netmask = NULL; /* Ignored */
+int is_ipv6 = 0;
+char *tld_file = (dmarc_tld_file == NULL) ?
+ DMARC_TLD_FILE : CS dmarc_tld_file;
+
+/* Set some sane defaults. Also clears previous results when
+ * multiple messages in one connection. */
+dmarc_pctx = NULL;
+dmarc_status = US"none";
+dmarc_abort = FALSE;
+dmarc_pass_fail = US"skipped";
+dmarc_used_domain = US"";
+dmarc_ar_header = NULL;
+dmarc_has_been_checked = FALSE;
+header_from_sender = NULL;
+spf_sender_domain = NULL;
+spf_human_readable = NULL;
+
+/* ACLs have "control=dmarc_disable_verify" */
+if (dmarc_disable_verify == TRUE)
+ return OK;
+
+(void) memset(&dmarc_ctx, '\0', sizeof dmarc_ctx);
+dmarc_ctx.nscount = 0;
+libdm_status = opendmarc_policy_library_init(&dmarc_ctx);
+if (libdm_status != DMARC_PARSE_OKAY)
{
- log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to init library: %s",
- opendmarc_policy_status_to_str(libdm_status));
- dmarc_abort = TRUE;
+ log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to init library: %s",
+ opendmarc_policy_status_to_str(libdm_status));
+ dmarc_abort = TRUE;
}
- if (opendmarc_tld_read_file(tld_file, NULL, NULL, NULL))
+if (dmarc_tld_file == NULL)
+ dmarc_abort = TRUE;
+else if (opendmarc_tld_read_file(tld_file, NULL, NULL, NULL))
{
- log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to load tld list %s: %d",
- tld_file, errno);
- dmarc_abort = TRUE;
+ log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to load tld list %s: %d",
+ tld_file, errno);
+ dmarc_abort = TRUE;
}
- if (sender_host_address == NULL)
- dmarc_abort = TRUE;
- /* This catches locally originated email and startup errors above. */
- if ( dmarc_abort == FALSE )
+if (sender_host_address == NULL)
+ dmarc_abort = TRUE;
+/* This catches locally originated email and startup errors above. */
+if (!dmarc_abort)
{
- is_ipv6 = string_is_ip_address(sender_host_address, netmask);
- is_ipv6 = (is_ipv6 == 6) ? TRUE :
- (is_ipv6 == 4) ? FALSE : FALSE;
- dmarc_pctx = opendmarc_policy_connect_init(sender_host_address, is_ipv6);
- if (dmarc_pctx == NULL )
+ is_ipv6 = string_is_ip_address(sender_host_address, netmask) == 6;
+ dmarc_pctx = opendmarc_policy_connect_init(sender_host_address, is_ipv6);
+ if (dmarc_pctx == NULL)
{
- log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure creating policy context: ip=%s",
- sender_host_address);
- dmarc_abort = TRUE;
+ log_write(0, LOG_MAIN|LOG_PANIC,
+ "DMARC failure creating policy context: ip=%s", sender_host_address);
+ dmarc_abort = TRUE;
}
}
- return OK;
+return OK;
}
}
+static void
+dmarc_send_forensic_report(u_char **ruf)
+{
+int c;
+uschar *recipient, *save_sender;
+BOOL send_status = FALSE;
+error_block *eblock = NULL;
+FILE *message_file = NULL;
+
+/* Earlier ACL does not have *required* control=dmarc_enable_forensic */
+if (!dmarc_enable_forensic)
+ return;
+
+if ( dmarc_policy == DMARC_POLICY_REJECT && action == DMARC_RESULT_REJECT
+ || dmarc_policy == DMARC_POLICY_QUARANTINE && action == DMARC_RESULT_QUARANTINE
+ || dmarc_policy == DMARC_POLICY_NONE && action == DMARC_RESULT_REJECT
+ || dmarc_policy == DMARC_POLICY_NONE && action == DMARC_RESULT_QUARANTINE
+ )
+ if (ruf)
+ {
+ eblock = add_to_eblock(eblock, US"Sender Domain", dmarc_used_domain);
+ eblock = add_to_eblock(eblock, US"Sender IP Address", sender_host_address);
+ eblock = add_to_eblock(eblock, US"Received Date", tod_stamp(tod_full));
+ eblock = add_to_eblock(eblock, US"SPF Alignment",
+ (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?US"yes":US"no");
+ eblock = add_to_eblock(eblock, US"DKIM Alignment",
+ (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?US"yes":US"no");
+ eblock = add_to_eblock(eblock, US"DMARC Results", dmarc_status_text);
+ /* Set a sane default envelope sender */
+ dsn_from = dmarc_forensic_sender ? dmarc_forensic_sender :
+ dsn_from ? dsn_from :
+ string_sprintf("do-not-reply@%s",primary_hostname);
+ for (c = 0; ruf[c]; c++)
+ {
+ recipient = string_copylc(ruf[c]);
+ if (Ustrncmp(recipient, "mailto:",7))
+ continue;
+ /* Move to first character past the colon */
+ recipient += 7;
+ DEBUG(D_receive)
+ debug_printf("DMARC forensic report to %s%s\n", recipient,
+ (host_checking || running_in_test_harness) ? " (not really)" : "");
+ if (host_checking || running_in_test_harness)
+ continue;
+
+ save_sender = sender_address;
+ sender_address = recipient;
+ send_status = moan_to_sender(ERRMESS_DMARC_FORENSIC, eblock,
+ header_list, message_file, FALSE);
+ sender_address = save_sender;
+ if (!send_status)
+ log_write(0, LOG_MAIN|LOG_PANIC,
+ "failure to send DMARC forensic report to %s", recipient);
+ }
+ }
+}
+
/* dmarc_process adds the envelope sender address to the existing
context (if any), retrieves the result, sets up expansion
strings and evaluates the condition outcome. */
-int dmarc_process() {
- int sr, origin; /* used in SPF section */
- pdkim_signature *sig = NULL;
- BOOL has_dmarc_record = TRUE;
- u_char **ruf; /* forensic report addressees, if called for */
-
- /* ACLs have "control=dmarc_disable_verify" */
- if (dmarc_disable_verify == TRUE)
+int
+dmarc_process()
+{
+int sr, origin; /* used in SPF section */
+int dmarc_spf_result = 0; /* stores spf into dmarc conn ctx */
+int tmp_ans, c;
+pdkim_signature *sig = NULL;
+BOOL has_dmarc_record = TRUE;
+u_char **ruf; /* forensic report addressees, if called for */
+
+/* ACLs have "control=dmarc_disable_verify" */
+if (dmarc_disable_verify)
{
- dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
- return OK;
+ dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
+ return OK;
}
- /* Store the header From: sender domain for this part of DMARC.
- * If there is no from_header struct, then it's likely this message
- * is locally generated and relying on fixups to add it. Just skip
- * the entire DMARC system if we can't find a From: header....or if
- * there was a previous error.
- */
- if (from_header == NULL || dmarc_abort == TRUE)
- dmarc_abort = TRUE;
- else
+/* Store the header From: sender domain for this part of DMARC.
+ * If there is no from_header struct, then it's likely this message
+ * is locally generated and relying on fixups to add it. Just skip
+ * the entire DMARC system if we can't find a From: header....or if
+ * there was a previous error.
+ */
+if (!from_header || dmarc_abort)
+ dmarc_abort = TRUE;
+else
{
- /* I strongly encourage anybody who can make this better to contact me directly!
- * <cannonball> Is this an insane way to extract the email address from the From: header?
- * <jgh_hm> it's sure a horrid layer-crossing....
- * <cannonball> I'm not denying that :-/
- * <jgh_hm> there may well be no better though
- */
- header_from_sender = expand_string(
- string_sprintf("${domain:${extract{1}{:}{${addresses:%s}}}}",
- from_header->text) );
+ uschar * errormsg;
+ int dummy, domain;
+ uschar * p;
+ uschar saveend;
+
+ parse_allow_group = TRUE;
+ p = parse_find_address_end(from_header->text, FALSE);
+ saveend = *p; *p = '\0';
+ if ((header_from_sender = parse_extract_address(from_header->text, &errormsg,
+ &dummy, &dummy, &domain, FALSE)))
+ header_from_sender += domain;
+ *p = saveend;
+
/* The opendmarc library extracts the domain from the email address, but
* only try to store it if it's not empty. Otherwise, skip out of DMARC. */
- if (strcmp( CCS header_from_sender, "") == 0)
+ if (!header_from_sender || (strcmp( CCS header_from_sender, "") == 0))
dmarc_abort = TRUE;
- libdm_status = (dmarc_abort == TRUE) ?
- DMARC_PARSE_OKAY :
- opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender);
+ libdm_status = dmarc_abort ?
+ DMARC_PARSE_OKAY :
+ opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender);
if (libdm_status != DMARC_PARSE_OKAY)
{
- log_write(0, LOG_MAIN|LOG_PANIC, "failure to store header From: in DMARC: %s, header was '%s'",
- opendmarc_policy_status_to_str(libdm_status), from_header->text);
- dmarc_abort = TRUE;
+ log_write(0, LOG_MAIN|LOG_PANIC,
+ "failure to store header From: in DMARC: %s, header was '%s'",
+ opendmarc_policy_status_to_str(libdm_status), from_header->text);
+ dmarc_abort = TRUE;
}
}
- /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should
- * instead do this in the ACLs. */
- if (dmarc_abort == FALSE && sender_host_authenticated == NULL)
+/* Skip DMARC if connection is SMTP Auth. Temporarily, admin should
+ * instead do this in the ACLs. */
+if (!dmarc_abort && !sender_host_authenticated)
{
- /* Use the envelope sender domain for this part of DMARC */
- spf_sender_domain = expand_string(US"$sender_address_domain");
- if ( spf_response == NULL )
+ /* Use the envelope sender domain for this part of DMARC */
+ spf_sender_domain = expand_string(US"$sender_address_domain");
+ if (!spf_response)
{
- /* No spf data means null envelope sender so generate a domain name
- * from the sender_host_name || sender_helo_name */
- if (spf_sender_domain == NULL)
+ /* No spf data means null envelope sender so generate a domain name
+ * from the sender_helo_name */
+ if (!spf_sender_domain)
{
- spf_sender_domain = (sender_host_name == NULL) ? sender_helo_name : sender_host_name;
- uschar *subdomain = spf_sender_domain;
- int count = 0;
- while (subdomain && *subdomain != '.')
- {
- subdomain++;
- count++;
- }
- /* If parsed characters in temp var "subdomain" and is pointing to
- * a period now, get rid of the period and use that. Otherwise
- * will use whatever was first set in spf_sender_domain. Goal is to
- * generate a sane answer, not necessarily the right/best answer b/c
- * at this point with a null sender, it's a bounce message, making
- * the spf domain be subjective. */
- if (count > 0 && *subdomain == '.')
- {
- subdomain++;
- spf_sender_domain = subdomain;
- }
- log_write(0, LOG_MAIN, "DMARC using synthesized SPF sender domain = %s\n",
- spf_sender_domain);
- DEBUG(D_receive)
- debug_printf("DMARC using synthesized SPF sender domain = %s\n", spf_sender_domain);
+ spf_sender_domain = sender_helo_name;
+ log_write(0, LOG_MAIN, "DMARC using synthesized SPF sender domain = %s\n",
+ spf_sender_domain);
+ DEBUG(D_receive)
+ debug_printf("DMARC using synthesized SPF sender domain = %s\n",
+ spf_sender_domain);
}
- dmarc_spf_result = DMARC_POLICY_SPF_OUTCOME_NONE;
- origin = DMARC_POLICY_SPF_ORIGIN_HELO;
- spf_human_readable = US"";
+ dmarc_spf_result = DMARC_POLICY_SPF_OUTCOME_NONE;
+ dmarc_spf_ares_result = ARES_RESULT_UNKNOWN;
+ origin = DMARC_POLICY_SPF_ORIGIN_HELO;
+ spf_human_readable = US"";
}
- else
+ else
{
- sr = spf_response->result;
- dmarc_spf_result = (sr == SPF_RESULT_NEUTRAL) ? DMARC_POLICY_SPF_OUTCOME_NONE :
- (sr == SPF_RESULT_PASS) ? DMARC_POLICY_SPF_OUTCOME_PASS :
- (sr == SPF_RESULT_FAIL) ? DMARC_POLICY_SPF_OUTCOME_FAIL :
- (sr == SPF_RESULT_SOFTFAIL) ? DMARC_POLICY_SPF_OUTCOME_TMPFAIL :
- DMARC_POLICY_SPF_OUTCOME_NONE;
- origin = DMARC_POLICY_SPF_ORIGIN_MAILFROM;
- spf_human_readable = (uschar *)spf_response->header_comment;
- DEBUG(D_receive)
- debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain);
+ sr = spf_response->result;
+ dmarc_spf_result = sr == SPF_RESULT_NEUTRAL ? DMARC_POLICY_SPF_OUTCOME_NONE :
+ sr == SPF_RESULT_PASS ? DMARC_POLICY_SPF_OUTCOME_PASS :
+ sr == SPF_RESULT_FAIL ? DMARC_POLICY_SPF_OUTCOME_FAIL :
+ sr == SPF_RESULT_SOFTFAIL ? DMARC_POLICY_SPF_OUTCOME_TMPFAIL :
+ DMARC_POLICY_SPF_OUTCOME_NONE;
+ dmarc_spf_ares_result = sr == SPF_RESULT_NEUTRAL ? ARES_RESULT_NEUTRAL :
+ sr == SPF_RESULT_PASS ? ARES_RESULT_PASS :
+ sr == SPF_RESULT_FAIL ? ARES_RESULT_FAIL :
+ sr == SPF_RESULT_SOFTFAIL ? ARES_RESULT_SOFTFAIL :
+ sr == SPF_RESULT_NONE ? ARES_RESULT_NONE :
+ sr == SPF_RESULT_TEMPERROR ? ARES_RESULT_TEMPERROR :
+ sr == SPF_RESULT_PERMERROR ? ARES_RESULT_PERMERROR :
+ ARES_RESULT_UNKNOWN;
+ origin = DMARC_POLICY_SPF_ORIGIN_MAILFROM;
+ spf_human_readable = US spf_response->header_comment;
+ DEBUG(D_receive)
+ debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain);
}
- if (strcmp( CCS spf_sender_domain, "") == 0)
- dmarc_abort = TRUE;
- if (dmarc_abort == FALSE)
+ if (strcmp( CCS spf_sender_domain, "") == 0)
+ dmarc_abort = TRUE;
+ if (!dmarc_abort)
{
- libdm_status = opendmarc_policy_store_spf(dmarc_pctx, spf_sender_domain,
- dmarc_spf_result, origin, spf_human_readable);
- if (libdm_status != DMARC_PARSE_OKAY)
- log_write(0, LOG_MAIN|LOG_PANIC, "failure to store spf for DMARC: %s",
- opendmarc_policy_status_to_str(libdm_status));
+ libdm_status = opendmarc_policy_store_spf(dmarc_pctx, spf_sender_domain,
+ dmarc_spf_result, origin, spf_human_readable);
+ if (libdm_status != DMARC_PARSE_OKAY)
+ log_write(0, LOG_MAIN|LOG_PANIC, "failure to store spf for DMARC: %s",
+ opendmarc_policy_status_to_str(libdm_status));
}
- /* Now we cycle through the dkim signature results and put into
- * the opendmarc context, further building the DMARC reply. */
- sig = dkim_signatures;
- dkim_history_buffer = US"";
- while (sig != NULL)
+ /* Now we cycle through the dkim signature results and put into
+ * the opendmarc context, further building the DMARC reply. */
+ sig = dkim_signatures;
+ dkim_history_buffer = US"";
+ while (sig)
{
- int dkim_result, vs;
- vs = sig->verify_status;
- dkim_result = ( vs == PDKIM_VERIFY_PASS ) ? DMARC_POLICY_DKIM_OUTCOME_PASS :
- ( vs == PDKIM_VERIFY_FAIL ) ? DMARC_POLICY_DKIM_OUTCOME_FAIL :
- ( vs == PDKIM_VERIFY_INVALID ) ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL :
- DMARC_POLICY_DKIM_OUTCOME_NONE;
- libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, (uschar *)sig->domain,
- dkim_result, US"");
- DEBUG(D_receive)
- debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain);
- if (libdm_status != DMARC_PARSE_OKAY)
- log_write(0, LOG_MAIN|LOG_PANIC, "failure to store dkim (%s) for DMARC: %s",
- sig->domain, opendmarc_policy_status_to_str(libdm_status));
-
- dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer,
- sig->domain, dkim_result);
- sig = sig->next;
- }
- libdm_status = opendmarc_policy_query_dmarc(dmarc_pctx, US"");
- switch (libdm_status)
- {
- case DMARC_DNS_ERROR_NXDOMAIN:
- case DMARC_DNS_ERROR_NO_RECORD:
- DEBUG(D_receive)
- debug_printf("DMARC no record found for %s\n", header_from_sender);
- has_dmarc_record = FALSE;
- break;
- case DMARC_PARSE_OKAY:
- DEBUG(D_receive)
- debug_printf("DMARC record found for %s\n", header_from_sender);
- break;
- case DMARC_PARSE_ERROR_BAD_VALUE:
- DEBUG(D_receive)
- debug_printf("DMARC record parse error for %s\n", header_from_sender);
- has_dmarc_record = FALSE;
- break;
- default:
- /* everything else, skip dmarc */
- DEBUG(D_receive)
- debug_printf("DMARC skipping (%d), unsure what to do with %s",
- libdm_status, from_header->text);
- has_dmarc_record = FALSE;
- break;
- }
- /* Can't use exim's string manipulation functions so allocate memory
- * for libopendmarc using its max hostname length definition. */
- uschar *dmarc_domain = (uschar *)calloc(DMARC_MAXHOSTNAMELEN, sizeof(uschar));
- libdm_status = opendmarc_policy_fetch_utilized_domain(dmarc_pctx, dmarc_domain,
- DMARC_MAXHOSTNAMELEN-1);
- dmarc_used_domain = string_copy(dmarc_domain);
- free(dmarc_domain);
+ int dkim_result, dkim_ares_result, vs, ves;
+ vs = sig->verify_status;
+ ves = sig->verify_ext_status;
+ dkim_result = vs == PDKIM_VERIFY_PASS ? DMARC_POLICY_DKIM_OUTCOME_PASS :
+ vs == PDKIM_VERIFY_FAIL ? DMARC_POLICY_DKIM_OUTCOME_FAIL :
+ vs == PDKIM_VERIFY_INVALID ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL :
+ DMARC_POLICY_DKIM_OUTCOME_NONE;
+ libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, US sig->domain,
+ dkim_result, US"");
+ DEBUG(D_receive)
+ debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain);
if (libdm_status != DMARC_PARSE_OKAY)
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "failure to read domainname used for DMARC lookup: %s",
- opendmarc_policy_status_to_str(libdm_status));
+ log_write(0, LOG_MAIN|LOG_PANIC,
+ "failure to store dkim (%s) for DMARC: %s",
+ sig->domain, opendmarc_policy_status_to_str(libdm_status));
+
+ dkim_ares_result =
+ vs == PDKIM_VERIFY_PASS ? ARES_RESULT_PASS :
+ vs == PDKIM_VERIFY_FAIL ? ARES_RESULT_FAIL :
+ vs == PDKIM_VERIFY_NONE ? ARES_RESULT_NONE :
+ vs == PDKIM_VERIFY_INVALID ?
+ ves == PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE ? ARES_RESULT_PERMERROR :
+ ves == PDKIM_VERIFY_INVALID_BUFFER_SIZE ? ARES_RESULT_PERMERROR :
+ ves == PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD ? ARES_RESULT_PERMERROR :
+ ves == PDKIM_VERIFY_INVALID_PUBKEY_IMPORT ? ARES_RESULT_PERMERROR :
+ ARES_RESULT_UNKNOWN :
+ ARES_RESULT_UNKNOWN;
+ dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer,
+ sig->domain, dkim_ares_result);
+ sig = sig->next;
}
- libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx);
- dmarc_policy = libdm_status;
- switch(libdm_status)
+ libdm_status = opendmarc_policy_query_dmarc(dmarc_pctx, US"");
+ switch (libdm_status)
{
- case DMARC_POLICY_ABSENT: /* No DMARC record found */
- dmarc_status = US"norecord";
- dmarc_pass_fail = US"temperror";
- dmarc_status_text = US"No DMARC record";
- action = DMARC_RESULT_ACCEPT;
- break;
- case DMARC_FROM_DOMAIN_ABSENT: /* No From: domain */
- dmarc_status = US"nofrom";
- dmarc_pass_fail = US"temperror";
- dmarc_status_text = US"No From: domain found";
- action = DMARC_RESULT_ACCEPT;
- break;
- case DMARC_POLICY_NONE: /* Accept and report */
- dmarc_status = US"none";
- dmarc_pass_fail = US"none";
- dmarc_status_text = US"None, Accept";
- action = DMARC_RESULT_ACCEPT;
- break;
- case DMARC_POLICY_PASS: /* Explicit accept */
- dmarc_status = US"accept";
- dmarc_pass_fail = US"pass";
- dmarc_status_text = US"Accept";
- action = DMARC_RESULT_ACCEPT;
- break;
- case DMARC_POLICY_REJECT: /* Explicit reject */
- dmarc_status = US"reject";
- dmarc_pass_fail = US"fail";
- dmarc_status_text = US"Reject";
- action = DMARC_RESULT_REJECT;
- break;
- case DMARC_POLICY_QUARANTINE: /* Explicit quarantine */
- dmarc_status = US"quarantine";
- dmarc_pass_fail = US"fail";
- dmarc_status_text = US"Quarantine";
- action = DMARC_RESULT_QUARANTINE;
- break;
- default:
- dmarc_status = US"temperror";
- dmarc_pass_fail = US"temperror";
- dmarc_status_text = US"Internal Policy Error";
- action = DMARC_RESULT_TEMPFAIL;
- break;
+ case DMARC_DNS_ERROR_NXDOMAIN:
+ case DMARC_DNS_ERROR_NO_RECORD:
+ DEBUG(D_receive)
+ debug_printf("DMARC no record found for %s\n", header_from_sender);
+ has_dmarc_record = FALSE;
+ break;
+ case DMARC_PARSE_OKAY:
+ DEBUG(D_receive)
+ debug_printf("DMARC record found for %s\n", header_from_sender);
+ break;
+ case DMARC_PARSE_ERROR_BAD_VALUE:
+ DEBUG(D_receive)
+ debug_printf("DMARC record parse error for %s\n", header_from_sender);
+ has_dmarc_record = FALSE;
+ break;
+ default:
+ /* everything else, skip dmarc */
+ DEBUG(D_receive)
+ debug_printf("DMARC skipping (%d), unsure what to do with %s",
+ libdm_status, from_header->text);
+ has_dmarc_record = FALSE;
+ break;
}
- libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa);
- if (libdm_status != DMARC_PARSE_OKAY)
+/* Store the policy string in an expandable variable. */
+
+ libdm_status = opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
+ for (c = 0; dmarc_policy_description[c].name; c++)
+ if (tmp_ans == dmarc_policy_description[c].value)
+ {
+ dmarc_domain_policy = string_sprintf("%s",dmarc_policy_description[c].name);
+ break;
+ }
+
+ /* Can't use exim's string manipulation functions so allocate memory
+ * for libopendmarc using its max hostname length definition. */
+
+ uschar *dmarc_domain = US calloc(DMARC_MAXHOSTNAMELEN, sizeof(uschar));
+ libdm_status = opendmarc_policy_fetch_utilized_domain(dmarc_pctx,
+ dmarc_domain, DMARC_MAXHOSTNAMELEN-1);
+ dmarc_used_domain = string_copy(dmarc_domain);
+ free(dmarc_domain);
+
+ if (libdm_status != DMARC_PARSE_OKAY)
+ log_write(0, LOG_MAIN|LOG_PANIC,
+ "failure to read domainname used for DMARC lookup: %s",
+ opendmarc_policy_status_to_str(libdm_status));
+
+ libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx);
+ dmarc_policy = libdm_status;
+ switch(libdm_status)
{
- log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s",
- opendmarc_policy_status_to_str(libdm_status));
+ case DMARC_POLICY_ABSENT: /* No DMARC record found */
+ dmarc_status = US"norecord";
+ dmarc_pass_fail = US"none";
+ dmarc_status_text = US"No DMARC record";
+ action = DMARC_RESULT_ACCEPT;
+ break;
+ case DMARC_FROM_DOMAIN_ABSENT: /* No From: domain */
+ dmarc_status = US"nofrom";
+ dmarc_pass_fail = US"temperror";
+ dmarc_status_text = US"No From: domain found";
+ action = DMARC_RESULT_ACCEPT;
+ break;
+ case DMARC_POLICY_NONE: /* Accept and report */
+ dmarc_status = US"none";
+ dmarc_pass_fail = US"none";
+ dmarc_status_text = US"None, Accept";
+ action = DMARC_RESULT_ACCEPT;
+ break;
+ case DMARC_POLICY_PASS: /* Explicit accept */
+ dmarc_status = US"accept";
+ dmarc_pass_fail = US"pass";
+ dmarc_status_text = US"Accept";
+ action = DMARC_RESULT_ACCEPT;
+ break;
+ case DMARC_POLICY_REJECT: /* Explicit reject */
+ dmarc_status = US"reject";
+ dmarc_pass_fail = US"fail";
+ dmarc_status_text = US"Reject";
+ action = DMARC_RESULT_REJECT;
+ break;
+ case DMARC_POLICY_QUARANTINE: /* Explicit quarantine */
+ dmarc_status = US"quarantine";
+ dmarc_pass_fail = US"fail";
+ dmarc_status_text = US"Quarantine";
+ action = DMARC_RESULT_QUARANTINE;
+ break;
+ default:
+ dmarc_status = US"temperror";
+ dmarc_pass_fail = US"temperror";
+ dmarc_status_text = US"Internal Policy Error";
+ action = DMARC_RESULT_TEMPFAIL;
+ break;
}
- if (has_dmarc_record == TRUE)
+ libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa);
+ if (libdm_status != DMARC_PARSE_OKAY)
+ log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s",
+ opendmarc_policy_status_to_str(libdm_status));
+
+ if (has_dmarc_record == TRUE)
{
- log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s "
- "spf_align=%s dkim_align=%s enforcement='%s'",
- spf_sender_domain, dmarc_used_domain,
- (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?"yes":"no",
- (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?"yes":"no",
- dmarc_status_text);
- history_file_status = dmarc_write_history_file();
- /* Now get the forensic reporting addresses, if any */
- ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1);
- dmarc_send_forensic_report(ruf);
+ log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s "
+ "spf_align=%s dkim_align=%s enforcement='%s'",
+ spf_sender_domain, dmarc_used_domain,
+ (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?"yes":"no",
+ (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?"yes":"no",
+ dmarc_status_text);
+ history_file_status = dmarc_write_history_file();
+ /* Now get the forensic reporting addresses, if any */
+ ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1);
+ dmarc_send_forensic_report(ruf);
}
}
- /* set some global variables here */
- dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
+/* set some global variables here */
+dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
- /* shut down libopendmarc */
- if ( dmarc_pctx != NULL )
- (void) opendmarc_policy_connect_shutdown(dmarc_pctx);
- if ( dmarc_disable_verify == FALSE )
- (void) opendmarc_policy_library_shutdown(&dmarc_ctx);
+/* shut down libopendmarc */
+if ( dmarc_pctx != NULL )
+ (void) opendmarc_policy_connect_shutdown(dmarc_pctx);
+if ( dmarc_disable_verify == FALSE )
+ (void) opendmarc_policy_library_shutdown(&dmarc_ctx);
- return OK;
+return OK;
}
-int dmarc_write_history_file()
+int
+dmarc_write_history_file()
{
- static int history_file_fd;
- ssize_t written_len;
- int tmp_ans;
- u_char **rua; /* aggregate report addressees */
- uschar *history_buffer = NULL;
+int history_file_fd;
+ssize_t written_len;
+int tmp_ans;
+u_char **rua; /* aggregate report addressees */
+uschar *history_buffer = NULL;
- if (dmarc_history_file == NULL)
- return DMARC_HIST_DISABLED;
- history_file_fd = log_create(dmarc_history_file);
+if (!dmarc_history_file)
+ return DMARC_HIST_DISABLED;
+history_file_fd = log_create(dmarc_history_file);
- if (history_file_fd < 0)
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s",
- dmarc_history_file);
- return DMARC_HIST_FILE_ERR;
- }
+if (history_file_fd < 0)
+{
+ log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s",
+ dmarc_history_file);
+ return DMARC_HIST_FILE_ERR;
+}
- /* Generate the contents of the history file */
- history_buffer = string_sprintf("job %s\n", message_id);
- history_buffer = string_sprintf("%sreporter %s\n", history_buffer, primary_hostname);
- history_buffer = string_sprintf("%sreceived %ld\n", history_buffer, time(NULL));
- history_buffer = string_sprintf("%sipaddr %s\n", history_buffer, sender_host_address);
- history_buffer = string_sprintf("%sfrom %s\n", history_buffer, header_from_sender);
- history_buffer = string_sprintf("%smfrom %s\n", history_buffer,
- expand_string(US"$sender_address_domain"));
-
- if (spf_response != NULL)
- history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_result);
- // history_buffer = string_sprintf("%sspf -1\n", history_buffer);
-
- history_buffer = string_sprintf("%s%s", history_buffer, dkim_history_buffer);
- history_buffer = string_sprintf("%spdomain %s\n", history_buffer, dmarc_used_domain);
- history_buffer = string_sprintf("%spolicy %d\n", history_buffer, dmarc_policy);
-
- rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1);
- if (rua != NULL)
- {
- for (tmp_ans = 0; rua[tmp_ans] != NULL; tmp_ans++)
- {
- history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]);
- }
- }
- else
- history_buffer = string_sprintf("%srua -\n", history_buffer);
+/* Generate the contents of the history file */
+history_buffer = string_sprintf(
+ "job %s\nreporter %s\nreceived %ld\nipaddr %s\nfrom %s\nmfrom %s\n",
+ message_id, primary_hostname, time(NULL), sender_host_address,
+ header_from_sender, expand_string(US"$sender_address_domain"));
- opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans);
- history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans);
+if (spf_response)
+ history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_ares_result);
+ /* history_buffer = string_sprintf("%sspf -1\n", history_buffer); */
- opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans);
- history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans);
+history_buffer = string_sprintf(
+ "%s%spdomain %s\npolicy %d\n",
+ history_buffer, dkim_history_buffer, dmarc_used_domain, dmarc_policy);
- opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans);
- history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans);
+if ((rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1)))
+ for (tmp_ans = 0; rua[tmp_ans]; tmp_ans++)
+ history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]);
+else
+ history_buffer = string_sprintf("%srua -\n", history_buffer);
- opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
- history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans);
+opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans);
+history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans);
- opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans);
- history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans);
+opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans);
+history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans);
- history_buffer = string_sprintf("%salign_dkim %d\n", history_buffer, da);
- history_buffer = string_sprintf("%salign_spf %d\n", history_buffer, sa);
- history_buffer = string_sprintf("%saction %d\n", history_buffer, action);
+opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans);
+history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans);
- /* Write the contents to the history file */
- DEBUG(D_receive)
- debug_printf("DMARC logging history data for opendmarc reporting%s\n",
- (host_checking || running_in_test_harness) ? " (not really)" : "");
- if (host_checking || running_in_test_harness)
- {
- DEBUG(D_receive)
- debug_printf("DMARC history data for debugging:\n%s", history_buffer);
- }
- else
+opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
+history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans);
+
+opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans);
+history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans);
+
+history_buffer = string_sprintf(
+ "%salign_dkim %d\nalign_spf %d\naction %d\n",
+ history_buffer, da, sa, action);
+
+/* Write the contents to the history file */
+DEBUG(D_receive)
+ debug_printf("DMARC logging history data for opendmarc reporting%s\n",
+ (host_checking || running_in_test_harness) ? " (not really)" : "");
+if (host_checking || running_in_test_harness)
{
- written_len = write_to_fd_buf(history_file_fd,
- history_buffer,
- Ustrlen(history_buffer));
- if (written_len == 0)
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s",
- dmarc_history_file);
- return DMARC_HIST_WRITE_ERR;
- }
- (void)close(history_file_fd);
+ DEBUG(D_receive)
+ debug_printf("DMARC history data for debugging:\n%s", history_buffer);
}
- return DMARC_HIST_OK;
-}
-
-void dmarc_send_forensic_report(u_char **ruf)
-{
- int c;
- uschar *recipient, *save_sender;
- BOOL send_status = FALSE;
- error_block *eblock = NULL;
- FILE *message_file = NULL;
-
- /* Earlier ACL does not have *required* control=dmarc_enable_forensic */
- if (dmarc_enable_forensic == FALSE)
- return;
-
- if ((dmarc_policy == DMARC_POLICY_REJECT && action == DMARC_RESULT_REJECT) ||
- (dmarc_policy == DMARC_POLICY_QUARANTINE && action == DMARC_RESULT_QUARANTINE) )
+else
{
- if (ruf != NULL)
+ written_len = write_to_fd_buf(history_file_fd,
+ history_buffer,
+ Ustrlen(history_buffer));
+ if (written_len == 0)
{
- eblock = add_to_eblock(eblock, US"Sender Domain", dmarc_used_domain);
- eblock = add_to_eblock(eblock, US"Sender IP Address", sender_host_address);
- eblock = add_to_eblock(eblock, US"Received Date", tod_stamp(tod_full));
- eblock = add_to_eblock(eblock, US"SPF Alignment",
- (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?US"yes":US"no");
- eblock = add_to_eblock(eblock, US"DKIM Alignment",
- (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?US"yes":US"no");
- eblock = add_to_eblock(eblock, US"DMARC Results", dmarc_status_text);
- /* Set a sane default envelope sender */
- dsn_from = dmarc_forensic_sender ? dmarc_forensic_sender :
- dsn_from ? dsn_from :
- string_sprintf("do-not-reply@%s",primary_hostname);
- for (c = 0; ruf[c] != NULL; c++)
- {
- recipient = string_copylc(ruf[c]);
- if (Ustrncmp(recipient, "mailto:",7))
- continue;
- /* Move to first character past the colon */
- recipient += 7;
- DEBUG(D_receive)
- debug_printf("DMARC forensic report to %s%s\n", recipient,
- (host_checking || running_in_test_harness) ? " (not really)" : "");
- if (host_checking || running_in_test_harness)
- continue;
- save_sender = sender_address;
- sender_address = recipient;
- send_status = moan_to_sender(ERRMESS_DMARC_FORENSIC, eblock,
- header_list, message_file, FALSE);
- sender_address = save_sender;
- if (send_status == FALSE)
- log_write(0, LOG_MAIN|LOG_PANIC, "failure to send DMARC forensic report to %s",
- recipient);
- }
+ log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s",
+ dmarc_history_file);
+ return DMARC_HIST_WRITE_ERR;
}
+ (void)close(history_file_fd);
}
+return DMARC_HIST_OK;
}
-uschar *dmarc_exim_expand_query(int what)
+uschar *
+dmarc_exim_expand_query(int what)
{
- if (dmarc_disable_verify || !dmarc_pctx)
- return dmarc_exim_expand_defaults(what);
+if (dmarc_disable_verify || !dmarc_pctx)
+ return dmarc_exim_expand_defaults(what);
- switch(what) {
- case DMARC_VERIFY_STATUS:
- return(dmarc_status);
- default:
- return US"";
+switch(what)
+ {
+ case DMARC_VERIFY_STATUS:
+ return(dmarc_status);
+ default:
+ return US"";
}
}
-uschar *dmarc_exim_expand_defaults(int what)
+uschar *
+dmarc_exim_expand_defaults(int what)
{
- switch(what) {
- case DMARC_VERIFY_STATUS:
- return (dmarc_disable_verify) ?
- US"off" :
- US"none";
- default:
- return US"";
+switch(what)
+ {
+ case DMARC_VERIFY_STATUS:
+ return dmarc_disable_verify ? US"off" : US"none";
+ default:
+ return US"";
}
}
-uschar *dmarc_auth_results_header(header_line *from_header, uschar *hostname)
+uschar *
+dmarc_auth_results_header(header_line *from_header, uschar *hostname)
{
- uschar *hdr_tmp = US"";
+uschar *hdr_tmp = US"";
- /* Allow a server hostname to be passed to this function, but is
- * currently unused */
- if (hostname == NULL)
- hostname = primary_hostname;
- hdr_tmp = string_sprintf("%s %s;", DMARC_AR_HEADER, hostname);
+/* Allow a server hostname to be passed to this function, but is
+ * currently unused */
+if (!hostname)
+ hostname = primary_hostname;
+hdr_tmp = string_sprintf("%s %s;", DMARC_AR_HEADER, hostname);
#if 0
- /* I don't think this belongs here, but left it here commented out
- * because it was a lot of work to get working right. */
- if (spf_response != NULL) {
- uschar *dmarc_ar_spf = US"";
- int sr = 0;
- sr = spf_response->result;
- dmarc_ar_spf = (sr == SPF_RESULT_NEUTRAL) ? US"neutral" :
- (sr == SPF_RESULT_PASS) ? US"pass" :
- (sr == SPF_RESULT_FAIL) ? US"fail" :
- (sr == SPF_RESULT_SOFTFAIL) ? US"softfail" :
- US"none";
- hdr_tmp = string_sprintf("%s spf=%s (%s) smtp.mail=%s;",
- hdr_tmp, dmarc_ar_spf_result,
- spf_response->header_comment,
- expand_string(US"$sender_address") );
- }
+/* I don't think this belongs here, but left it here commented out
+ * because it was a lot of work to get working right. */
+if (spf_response != NULL) {
+ uschar *dmarc_ar_spf = US"";
+ int sr = 0;
+ sr = spf_response->result;
+ dmarc_ar_spf = (sr == SPF_RESULT_NEUTRAL) ? US"neutral" :
+ (sr == SPF_RESULT_PASS) ? US"pass" :
+ (sr == SPF_RESULT_FAIL) ? US"fail" :
+ (sr == SPF_RESULT_SOFTFAIL) ? US"softfail" :
+ US"none";
+ hdr_tmp = string_sprintf("%s spf=%s (%s) smtp.mail=%s;",
+ hdr_tmp, dmarc_ar_spf_result,
+ spf_response->header_comment,
+ expand_string(US"$sender_address") );
+}
#endif
- hdr_tmp = string_sprintf("%s dmarc=%s",
- hdr_tmp, dmarc_pass_fail);
- if (header_from_sender)
- hdr_tmp = string_sprintf("%s header.from=%s",
- hdr_tmp, header_from_sender);
- return hdr_tmp;
+
+hdr_tmp = string_sprintf("%s dmarc=%s", hdr_tmp, dmarc_pass_fail);
+if (header_from_sender)
+ hdr_tmp = string_sprintf("%s header.from=%s",
+ hdr_tmp, header_from_sender);
+return hdr_tmp;
}
-#endif /* EXPERIMENTAL_SPF */
+# endif /* EXPERIMENTAL_SPF */
#endif /* EXPERIMENTAL_DMARC */
-
-// vim:sw=2 expandtab
+/* vi: aw ai sw=2
+ */
git://git.exim.org / users / heiko / exim.git / blobdiff