src/src/dmarc.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4 /* Experimental DMARC support.
   5    Copyright (c) Todd Lyons <tlyons@exim.org> 2012 - 2014
   6    License: GPL */
   7
   8 /* Portions Copyright (c) 2012, 2013, The Trusted Domain Project;
   9    All rights reserved, licensed for use per LICENSE.opendmarc. */
  10
  11 /* Code for calling dmarc checks via libopendmarc. Called from acl.c. */
  12
  13 #include "exim.h"
  14 #ifdef EXPERIMENTAL_DMARC
  15 # if !defined SUPPORT_SPF
  16 #  error SPF must also be enabled for DMARC
  17 # elif defined DISABLE_DKIM
  18 #  error DKIM must also be enabled for DMARC
  19 # else
  20
  21 #  include "functions.h"
  22 #  include "dmarc.h"
  23 #  include "pdkim/pdkim.h"
  24
  25 OPENDMARC_LIB_T     dmarc_ctx;
  26 DMARC_POLICY_T     *dmarc_pctx = NULL;
  27 OPENDMARC_STATUS_T  libdm_status, action, dmarc_policy;
  28 OPENDMARC_STATUS_T  da, sa, action;
  29 BOOL dmarc_abort  = FALSE;
  30 uschar *dmarc_pass_fail = US"skipped";
  31 header_line *from_header   = NULL;
  32 extern SPF_response_t   *spf_response;
  33 int dmarc_spf_ares_result  = 0;
  34 uschar *spf_sender_domain  = NULL;
  35 uschar *spf_human_readable = NULL;
  36 u_char *header_from_sender = NULL;
  37 int history_file_status    = DMARC_HIST_OK;
  38 uschar *dkim_history_buffer= NULL;
  39
  40 typedef struct dmarc_exim_p {
  41   uschar *name;
  42   int    value;
  43 } dmarc_exim_p;
  44
  45 static dmarc_exim_p dmarc_policy_description[] = {
  46   /* name               value */
  47   { US"",           DMARC_RECORD_P_UNSPECIFIED },
  48   { US"none",       DMARC_RECORD_P_NONE },
  49   { US"quarantine", DMARC_RECORD_P_QUARANTINE },
  50   { US"reject",     DMARC_RECORD_P_REJECT },
  51   { NULL,           0 }
  52 };
  53 /* Accept an error_block struct, initialize if empty, parse to the
  54  * end, and append the two strings passed to it.  Used for adding
  55  * variable amounts of value:pair data to the forensic emails. */
  56
  57 static error_block *
  58 add_to_eblock(error_block *eblock, uschar *t1, uschar *t2)
  59 {
  60 error_block *eb = store_malloc(sizeof(error_block));
  61 if (eblock == NULL)
  62   eblock = eb;
  63 else
  64   {
  65   /* Find the end of the eblock struct and point it at eb */
  66   error_block *tmp = eblock;
  67   while(tmp->next != NULL)
  68     tmp = tmp->next;
  69   tmp->next = eb;
  70   }
  71 eb->text1 = t1;
  72 eb->text2 = t2;
  73 eb->next  = NULL;
  74 return eblock;
  75 }
  76
  77 /* dmarc_init sets up a context that can be re-used for several
  78    messages on the same SMTP connection (that come from the
  79    same host with the same HELO string) */
  80
  81 int
  82 dmarc_init()
  83 {
  84 int *netmask   = NULL;   /* Ignored */
  85 int is_ipv6    = 0;
  86 char *tld_file = dmarc_tld_file ? CS dmarc_tld_file : DMARC_TLD_FILE;
  87
  88 /* Set some sane defaults.  Also clears previous results when
  89  * multiple messages in one connection. */
  90 dmarc_pctx         = NULL;
  91 dmarc_status       = US"none";
  92 dmarc_abort        = FALSE;
  93 dmarc_pass_fail    = US"skipped";
  94 dmarc_used_domain  = US"";
  95 dmarc_ar_header    = NULL;
  96 dmarc_has_been_checked = FALSE;
  97 header_from_sender = NULL;
  98 spf_sender_domain  = NULL;
  99 spf_human_readable = NULL;
 100
 101 /* ACLs have "control=dmarc_disable_verify" */
 102 if (dmarc_disable_verify == TRUE)
 103   return OK;
 104
 105 (void) memset(&dmarc_ctx, '\0', sizeof dmarc_ctx);
 106 dmarc_ctx.nscount = 0;
 107 libdm_status = opendmarc_policy_library_init(&dmarc_ctx);
 108 if (libdm_status != DMARC_PARSE_OKAY)
 109   {
 110   log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to init library: %s",
 111                        opendmarc_policy_status_to_str(libdm_status));
 112   dmarc_abort = TRUE;
 113   }
 114 if (dmarc_tld_file == NULL)
 115   dmarc_abort = TRUE;
 116 else if (opendmarc_tld_read_file(tld_file, NULL, NULL, NULL))
 117   {
 118   log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to load tld list %s: %d",
 119                        tld_file, errno);
 120   dmarc_abort = TRUE;
 121   }
 122 if (sender_host_address == NULL)
 123   dmarc_abort = TRUE;
 124 /* This catches locally originated email and startup errors above. */
 125 if (!dmarc_abort)
 126   {
 127   is_ipv6 = string_is_ip_address(sender_host_address, netmask) == 6;
 128   dmarc_pctx = opendmarc_policy_connect_init(sender_host_address, is_ipv6);
 129   if (dmarc_pctx == NULL)
 130     {
 131     log_write(0, LOG_MAIN|LOG_PANIC,
 132       "DMARC failure creating policy context: ip=%s", sender_host_address);
 133     dmarc_abort = TRUE;
 134     }
 135   }
 136
 137 return OK;
 138 }
 139
 140
 141 /* dmarc_store_data stores the header data so that subsequent
 142  * dmarc_process can access the data */
 143
 144 int dmarc_store_data(header_line *hdr) {
 145   /* No debug output because would change every test debug output */
 146   if (dmarc_disable_verify != TRUE)
 147     from_header = hdr;
 148   return OK;
 149 }
 150
 151
 152 static void
 153 dmarc_send_forensic_report(u_char **ruf)
 154 {
 155 int   c;
 156 uschar *recipient, *save_sender;
 157 BOOL  send_status = FALSE;
 158 error_block *eblock = NULL;
 159 FILE *message_file = NULL;
 160
 161 /* Earlier ACL does not have *required* control=dmarc_enable_forensic */
 162 if (!dmarc_enable_forensic)
 163   return;
 164
 165 if (  dmarc_policy == DMARC_POLICY_REJECT     && action == DMARC_RESULT_REJECT
 166    || dmarc_policy == DMARC_POLICY_QUARANTINE && action == DMARC_RESULT_QUARANTINE
 167    || dmarc_policy == DMARC_POLICY_NONE       && action == DMARC_RESULT_REJECT
 168    || dmarc_policy == DMARC_POLICY_NONE       && action == DMARC_RESULT_QUARANTINE
 169    )
 170   if (ruf)
 171     {
 172     eblock = add_to_eblock(eblock, US"Sender Domain", dmarc_used_domain);
 173     eblock = add_to_eblock(eblock, US"Sender IP Address", sender_host_address);
 174     eblock = add_to_eblock(eblock, US"Received Date", tod_stamp(tod_full));
 175     eblock = add_to_eblock(eblock, US"SPF Alignment",
 176                            (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?US"yes":US"no");
 177     eblock = add_to_eblock(eblock, US"DKIM Alignment",
 178                            (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?US"yes":US"no");
 179     eblock = add_to_eblock(eblock, US"DMARC Results", dmarc_status_text);
 180     /* Set a sane default envelope sender */
 181     dsn_from = dmarc_forensic_sender ? dmarc_forensic_sender :
 182                dsn_from ? dsn_from :
 183                string_sprintf("do-not-reply@%s",primary_hostname);
 184     for (c = 0; ruf[c]; c++)
 185       {
 186       recipient = string_copylc(ruf[c]);
 187       if (Ustrncmp(recipient, "mailto:",7))
 188         continue;
 189       /* Move to first character past the colon */
 190       recipient += 7;
 191       DEBUG(D_receive)
 192         debug_printf("DMARC forensic report to %s%s\n", recipient,
 193              (host_checking || running_in_test_harness) ? " (not really)" : "");
 194       if (host_checking || running_in_test_harness)
 195         continue;
 196
 197       save_sender = sender_address;
 198       sender_address = recipient;
 199       send_status = moan_to_sender(ERRMESS_DMARC_FORENSIC, eblock,
 200                                    header_list, message_file, FALSE);
 201       sender_address = save_sender;
 202       if (!send_status)
 203         log_write(0, LOG_MAIN|LOG_PANIC,
 204           "failure to send DMARC forensic report to %s", recipient);
 205       }
 206     }
 207 }
 208
 209 /* dmarc_process adds the envelope sender address to the existing
 210    context (if any), retrieves the result, sets up expansion
 211    strings and evaluates the condition outcome. */
 212
 213 int
 214 dmarc_process()
 215 {
 216 int sr, origin;             /* used in SPF section */
 217 int dmarc_spf_result  = 0;  /* stores spf into dmarc conn ctx */
 218 int tmp_ans, c;
 219 pdkim_signature * sig = dkim_signatures;
 220 BOOL has_dmarc_record = TRUE;
 221 u_char **ruf; /* forensic report addressees, if called for */
 222
 223 /* ACLs have "control=dmarc_disable_verify" */
 224 if (dmarc_disable_verify)
 225   {
 226   dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
 227   return OK;
 228   }
 229
 230 /* Store the header From: sender domain for this part of DMARC.
 231  * If there is no from_header struct, then it's likely this message
 232  * is locally generated and relying on fixups to add it.  Just skip
 233  * the entire DMARC system if we can't find a From: header....or if
 234  * there was a previous error.
 235  */
 236 if (!from_header || dmarc_abort)
 237   dmarc_abort = TRUE;
 238 else
 239   {
 240   uschar * errormsg;
 241   int dummy, domain;
 242   uschar * p;
 243   uschar saveend;
 244
 245   parse_allow_group = TRUE;
 246   p = parse_find_address_end(from_header->text, FALSE);
 247   saveend = *p; *p = '\0';
 248   if ((header_from_sender = parse_extract_address(from_header->text, &errormsg,
 249                               &dummy, &dummy, &domain, FALSE)))
 250     header_from_sender += domain;
 251   *p = saveend;
 252
 253   /* The opendmarc library extracts the domain from the email address, but
 254    * only try to store it if it's not empty.  Otherwise, skip out of DMARC. */
 255   if (!header_from_sender || (strcmp( CCS header_from_sender, "") == 0))
 256     dmarc_abort = TRUE;
 257   libdm_status = dmarc_abort
 258     ? DMARC_PARSE_OKAY
 259     : opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender);
 260   if (libdm_status != DMARC_PARSE_OKAY)
 261     {
 262     log_write(0, LOG_MAIN|LOG_PANIC,
 263               "failure to store header From: in DMARC: %s, header was '%s'",
 264               opendmarc_policy_status_to_str(libdm_status), from_header->text);
 265     dmarc_abort = TRUE;
 266     }
 267   }
 268
 269 /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should
 270  * instead do this in the ACLs.  */
 271 if (!dmarc_abort && !sender_host_authenticated)
 272   {
 273   uschar * dmarc_domain;
 274
 275   /* Use the envelope sender domain for this part of DMARC */
 276   spf_sender_domain = expand_string(US"$sender_address_domain");
 277   if (!spf_response)
 278     {
 279     /* No spf data means null envelope sender so generate a domain name
 280      * from the sender_helo_name  */
 281     if (!spf_sender_domain)
 282       {
 283       spf_sender_domain = sender_helo_name;
 284       log_write(0, LOG_MAIN, "DMARC using synthesized SPF sender domain = %s\n",
 285                              spf_sender_domain);
 286       DEBUG(D_receive)
 287         debug_printf("DMARC using synthesized SPF sender domain = %s\n",
 288           spf_sender_domain);
 289       }
 290     dmarc_spf_result = DMARC_POLICY_SPF_OUTCOME_NONE;
 291     dmarc_spf_ares_result = ARES_RESULT_UNKNOWN;
 292     origin = DMARC_POLICY_SPF_ORIGIN_HELO;
 293     spf_human_readable = US"";
 294     }
 295   else
 296     {
 297     sr = spf_response->result;
 298     dmarc_spf_result = sr == SPF_RESULT_NEUTRAL  ? DMARC_POLICY_SPF_OUTCOME_NONE :
 299                        sr == SPF_RESULT_PASS     ? DMARC_POLICY_SPF_OUTCOME_PASS :
 300                        sr == SPF_RESULT_FAIL     ? DMARC_POLICY_SPF_OUTCOME_FAIL :
 301                        sr == SPF_RESULT_SOFTFAIL ? DMARC_POLICY_SPF_OUTCOME_TMPFAIL :
 302                        DMARC_POLICY_SPF_OUTCOME_NONE;
 303     dmarc_spf_ares_result = sr == SPF_RESULT_NEUTRAL   ? ARES_RESULT_NEUTRAL :
 304                             sr == SPF_RESULT_PASS      ? ARES_RESULT_PASS :
 305                             sr == SPF_RESULT_FAIL      ? ARES_RESULT_FAIL :
 306                             sr == SPF_RESULT_SOFTFAIL  ? ARES_RESULT_SOFTFAIL :
 307                             sr == SPF_RESULT_NONE      ? ARES_RESULT_NONE :
 308                             sr == SPF_RESULT_TEMPERROR ? ARES_RESULT_TEMPERROR :
 309                             sr == SPF_RESULT_PERMERROR ? ARES_RESULT_PERMERROR :
 310                             ARES_RESULT_UNKNOWN;
 311     origin = DMARC_POLICY_SPF_ORIGIN_MAILFROM;
 312     spf_human_readable = US spf_response->header_comment;
 313     DEBUG(D_receive)
 314       debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain);
 315     }
 316   if (strcmp( CCS spf_sender_domain, "") == 0)
 317     dmarc_abort = TRUE;
 318   if (!dmarc_abort)
 319     {
 320     libdm_status = opendmarc_policy_store_spf(dmarc_pctx, spf_sender_domain,
 321                                 dmarc_spf_result, origin, spf_human_readable);
 322     if (libdm_status != DMARC_PARSE_OKAY)
 323       log_write(0, LOG_MAIN|LOG_PANIC, "failure to store spf for DMARC: %s",
 324                            opendmarc_policy_status_to_str(libdm_status));
 325     }
 326
 327   /* Now we cycle through the dkim signature results and put into
 328    * the opendmarc context, further building the DMARC reply.  */
 329   dkim_history_buffer = US"";
 330   while (sig)
 331     {
 332     int dkim_result, dkim_ares_result, vs, ves;
 333
 334     vs  = sig->verify_status & ~PDKIM_VERIFY_POLICY;
 335     ves = sig->verify_ext_status;
 336     dkim_result = vs == PDKIM_VERIFY_PASS ? DMARC_POLICY_DKIM_OUTCOME_PASS :
 337                   vs == PDKIM_VERIFY_FAIL ? DMARC_POLICY_DKIM_OUTCOME_FAIL :
 338                   vs == PDKIM_VERIFY_INVALID ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL :
 339                   DMARC_POLICY_DKIM_OUTCOME_NONE;
 340     libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, US sig->domain,
 341                                                dkim_result, US"");
 342     DEBUG(D_receive)
 343       debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain);
 344     if (libdm_status != DMARC_PARSE_OKAY)
 345       log_write(0, LOG_MAIN|LOG_PANIC,
 346                 "failure to store dkim (%s) for DMARC: %s",
 347                 sig->domain, opendmarc_policy_status_to_str(libdm_status));
 348
 349     dkim_ares_result =
 350       vs == PDKIM_VERIFY_PASS    ? ARES_RESULT_PASS :
 351       vs == PDKIM_VERIFY_FAIL    ? ARES_RESULT_FAIL :
 352       vs == PDKIM_VERIFY_NONE    ? ARES_RESULT_NONE :
 353       vs == PDKIM_VERIFY_INVALID ?
 354        ves == PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE ? ARES_RESULT_PERMERROR :
 355        ves == PDKIM_VERIFY_INVALID_BUFFER_SIZE        ? ARES_RESULT_PERMERROR :
 356        ves == PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD   ? ARES_RESULT_PERMERROR :
 357        ves == PDKIM_VERIFY_INVALID_PUBKEY_IMPORT      ? ARES_RESULT_PERMERROR :
 358        ARES_RESULT_UNKNOWN :
 359       ARES_RESULT_UNKNOWN;
 360     dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer,
 361                                          sig->domain, dkim_ares_result);
 362     sig = sig->next;
 363     }
 364   libdm_status = opendmarc_policy_query_dmarc(dmarc_pctx, US"");
 365   switch (libdm_status)
 366     {
 367     case DMARC_DNS_ERROR_NXDOMAIN:
 368     case DMARC_DNS_ERROR_NO_RECORD:
 369       DEBUG(D_receive)
 370         debug_printf("DMARC no record found for %s\n", header_from_sender);
 371       has_dmarc_record = FALSE;
 372       break;
 373     case DMARC_PARSE_OKAY:
 374       DEBUG(D_receive)
 375         debug_printf("DMARC record found for %s\n", header_from_sender);
 376       break;
 377     case DMARC_PARSE_ERROR_BAD_VALUE:
 378       DEBUG(D_receive)
 379         debug_printf("DMARC record parse error for %s\n", header_from_sender);
 380       has_dmarc_record = FALSE;
 381       break;
 382     default:
 383       /* everything else, skip dmarc */
 384       DEBUG(D_receive)
 385         debug_printf("DMARC skipping (%d), unsure what to do with %s",
 386                       libdm_status, from_header->text);
 387       has_dmarc_record = FALSE;
 388       break;
 389     }
 390
 391 /* Store the policy string in an expandable variable. */
 392
 393   libdm_status = opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
 394   for (c = 0; dmarc_policy_description[c].name; c++)
 395     if (tmp_ans == dmarc_policy_description[c].value)
 396       {
 397       dmarc_domain_policy = string_sprintf("%s",dmarc_policy_description[c].name);
 398       break;
 399       }
 400
 401   /* Can't use exim's string manipulation functions so allocate memory
 402   for libopendmarc using its max hostname length definition. */
 403
 404   dmarc_domain = US calloc(DMARC_MAXHOSTNAMELEN, sizeof(uschar));
 405   libdm_status = opendmarc_policy_fetch_utilized_domain(dmarc_pctx,
 406     dmarc_domain, DMARC_MAXHOSTNAMELEN-1);
 407   dmarc_used_domain = string_copy(dmarc_domain);
 408   free(dmarc_domain);
 409
 410   if (libdm_status != DMARC_PARSE_OKAY)
 411     log_write(0, LOG_MAIN|LOG_PANIC,
 412       "failure to read domainname used for DMARC lookup: %s",
 413       opendmarc_policy_status_to_str(libdm_status));
 414
 415   dmarc_policy = libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx);
 416   switch(libdm_status)
 417     {
 418     case DMARC_POLICY_ABSENT:     /* No DMARC record found */
 419       dmarc_status = US"norecord";
 420       dmarc_pass_fail = US"none";
 421       dmarc_status_text = US"No DMARC record";
 422       action = DMARC_RESULT_ACCEPT;
 423       break;
 424     case DMARC_FROM_DOMAIN_ABSENT:    /* No From: domain */
 425       dmarc_status = US"nofrom";
 426       dmarc_pass_fail = US"temperror";
 427       dmarc_status_text = US"No From: domain found";
 428       action = DMARC_RESULT_ACCEPT;
 429       break;
 430     case DMARC_POLICY_NONE:       /* Accept and report */
 431       dmarc_status = US"none";
 432       dmarc_pass_fail = US"none";
 433       dmarc_status_text = US"None, Accept";
 434       action = DMARC_RESULT_ACCEPT;
 435       break;
 436     case DMARC_POLICY_PASS:       /* Explicit accept */
 437       dmarc_status = US"accept";
 438       dmarc_pass_fail = US"pass";
 439       dmarc_status_text = US"Accept";
 440       action = DMARC_RESULT_ACCEPT;
 441       break;
 442     case DMARC_POLICY_REJECT:       /* Explicit reject */
 443       dmarc_status = US"reject";
 444       dmarc_pass_fail = US"fail";
 445       dmarc_status_text = US"Reject";
 446       action = DMARC_RESULT_REJECT;
 447       break;
 448     case DMARC_POLICY_QUARANTINE:       /* Explicit quarantine */
 449       dmarc_status = US"quarantine";
 450       dmarc_pass_fail = US"fail";
 451       dmarc_status_text = US"Quarantine";
 452       action = DMARC_RESULT_QUARANTINE;
 453       break;
 454     default:
 455       dmarc_status = US"temperror";
 456       dmarc_pass_fail = US"temperror";
 457       dmarc_status_text = US"Internal Policy Error";
 458       action = DMARC_RESULT_TEMPFAIL;
 459       break;
 460     }
 461
 462   libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa);
 463   if (libdm_status != DMARC_PARSE_OKAY)
 464     log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s",
 465                              opendmarc_policy_status_to_str(libdm_status));
 466
 467   if (has_dmarc_record)
 468     {
 469     log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s "
 470                            "spf_align=%s dkim_align=%s enforcement='%s'",
 471                            spf_sender_domain, dmarc_used_domain,
 472                            (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?"yes":"no",
 473                            (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?"yes":"no",
 474                            dmarc_status_text);
 475     history_file_status = dmarc_write_history_file();
 476     /* Now get the forensic reporting addresses, if any */
 477     ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1);
 478     dmarc_send_forensic_report(ruf);
 479     }
 480   }
 481
 482 /* set some global variables here */
 483 dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
 484
 485 /* shut down libopendmarc */
 486 if (dmarc_pctx)
 487   (void) opendmarc_policy_connect_shutdown(dmarc_pctx);
 488 if (!dmarc_disable_verify)
 489   (void) opendmarc_policy_library_shutdown(&dmarc_ctx);
 490
 491 return OK;
 492 }
 493
 494 int
 495 dmarc_write_history_file()
 496 {
 497 int history_file_fd;
 498 ssize_t written_len;
 499 int tmp_ans;
 500 u_char **rua; /* aggregate report addressees */
 501 uschar *history_buffer = NULL;
 502
 503 if (!dmarc_history_file)
 504   return DMARC_HIST_DISABLED;
 505 history_file_fd = log_create(dmarc_history_file);
 506
 507 if (history_file_fd < 0)
 508   {
 509   log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s",
 510                            dmarc_history_file);
 511   return DMARC_HIST_FILE_ERR;
 512   }
 513
 514 /* Generate the contents of the history file */
 515 history_buffer = string_sprintf(
 516   "job %s\nreporter %s\nreceived %ld\nipaddr %s\nfrom %s\nmfrom %s\n",
 517   message_id, primary_hostname, time(NULL), sender_host_address,
 518   header_from_sender, expand_string(US"$sender_address_domain"));
 519
 520 if (spf_response)
 521   history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_ares_result);
 522   /* history_buffer = string_sprintf("%sspf -1\n", history_buffer); */
 523
 524 history_buffer = string_sprintf(
 525   "%s%spdomain %s\npolicy %d\n",
 526   history_buffer, dkim_history_buffer, dmarc_used_domain, dmarc_policy);
 527
 528 if ((rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1)))
 529   for (tmp_ans = 0; rua[tmp_ans]; tmp_ans++)
 530     history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]);
 531 else
 532   history_buffer = string_sprintf("%srua -\n", history_buffer);
 533
 534 opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans);
 535 history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans);
 536
 537 opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans);
 538 history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans);
 539
 540 opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans);
 541 history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans);
 542
 543 opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
 544 history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans);
 545
 546 opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans);
 547 history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans);
 548
 549 history_buffer = string_sprintf(
 550   "%salign_dkim %d\nalign_spf %d\naction %d\n",
 551   history_buffer, da, sa, action);
 552
 553 /* Write the contents to the history file */
 554 DEBUG(D_receive)
 555   debug_printf("DMARC logging history data for opendmarc reporting%s\n",
 556              (host_checking || running_in_test_harness) ? " (not really)" : "");
 557 if (host_checking || running_in_test_harness)
 558   {
 559   DEBUG(D_receive)
 560     debug_printf("DMARC history data for debugging:\n%s", history_buffer);
 561   }
 562 else
 563   {
 564   written_len = write_to_fd_buf(history_file_fd,
 565                                 history_buffer,
 566                                 Ustrlen(history_buffer));
 567   if (written_len == 0)
 568     {
 569     log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s",
 570                            dmarc_history_file);
 571     return DMARC_HIST_WRITE_ERR;
 572     }
 573   (void)close(history_file_fd);
 574   }
 575 return DMARC_HIST_OK;
 576 }
 577
 578
 579 uschar *
 580 dmarc_exim_expand_query(int what)
 581 {
 582 if (dmarc_disable_verify || !dmarc_pctx)
 583   return dmarc_exim_expand_defaults(what);
 584
 585 if (what == DMARC_VERIFY_STATUS)
 586   return dmarc_status;
 587 return US"";
 588 }
 589
 590 uschar *
 591 dmarc_exim_expand_defaults(int what)
 592 {
 593 if (what == DMARC_VERIFY_STATUS)
 594   return dmarc_disable_verify ?  US"off" : US"none";
 595 return US"";
 596 }
 597
 598 uschar *
 599 dmarc_auth_results_header(header_line *from_header, uschar *hostname)
 600 {
 601 uschar *hdr_tmp    = US"";
 602
 603 /* Allow a server hostname to be passed to this function, but is
 604  * currently unused */
 605 if (!hostname)
 606   hostname = primary_hostname;
 607 hdr_tmp = string_sprintf("%s %s;", DMARC_AR_HEADER, hostname);
 608
 609 #if 0
 610 /* I don't think this belongs here, but left it here commented out
 611  * because it was a lot of work to get working right. */
 612 if (spf_response != NULL) {
 613   uschar *dmarc_ar_spf = US"";
 614   int sr               = 0;
 615   sr = spf_response->result;
 616   dmarc_ar_spf = (sr == SPF_RESULT_NEUTRAL)  ? US"neutral" :
 617                  (sr == SPF_RESULT_PASS)     ? US"pass" :
 618                  (sr == SPF_RESULT_FAIL)     ? US"fail" :
 619                  (sr == SPF_RESULT_SOFTFAIL) ? US"softfail" :
 620                  US"none";
 621   hdr_tmp = string_sprintf("%s spf=%s (%s) smtp.mail=%s;",
 622                            hdr_tmp, dmarc_ar_spf_result,
 623                            spf_response->header_comment,
 624                            expand_string(US"$sender_address") );
 625 }
 626 #endif
 627
 628 hdr_tmp = string_sprintf("%s dmarc=%s", hdr_tmp, dmarc_pass_fail);
 629 if (header_from_sender)
 630   hdr_tmp = string_sprintf("%s header.from=%s",
 631                            hdr_tmp, header_from_sender);
 632 return hdr_tmp;
 633 }
 634
 635 # endif /* SUPPORT_SPF */
 636 #endif /* EXPERIMENTAL_DMARC */
 637 /* vi: aw ai sw=2
 638  */