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