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 (dmarc_tld_file == NULL)
 102     dmarc_abort = TRUE;
 103   else if (opendmarc_tld_read_file(tld_file, NULL, NULL, NULL))
 104   {
 105     log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to load tld list %s: %d",
 106                          tld_file, errno);
 107     dmarc_abort = TRUE;
 108   }
 109   if (sender_host_address == NULL)
 110     dmarc_abort = TRUE;
 111   /* This catches locally originated email and startup errors above. */
 112   if ( dmarc_abort == FALSE )
 113   {
 114     is_ipv6 = string_is_ip_address(sender_host_address, netmask);
 115     is_ipv6 = (is_ipv6 == 6) ? TRUE :
 116               (is_ipv6 == 4) ? FALSE : FALSE;
 117     dmarc_pctx = opendmarc_policy_connect_init(sender_host_address, is_ipv6);
 118     if (dmarc_pctx == NULL )
 119     {
 120       log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure creating policy context: ip=%s",
 121                                        sender_host_address);
 122       dmarc_abort = TRUE;
 123     }
 124   }
 125
 126   return OK;
 127 }
 128
 129
 130 /* dmarc_store_data stores the header data so that subsequent
 131  * dmarc_process can access the data */
 132
 133 int dmarc_store_data(header_line *hdr) {
 134   /* No debug output because would change every test debug output */
 135   if (dmarc_disable_verify != TRUE)
 136     from_header = hdr;
 137   return OK;
 138 }
 139
 140
 141 /* dmarc_process adds the envelope sender address to the existing
 142    context (if any), retrieves the result, sets up expansion
 143    strings and evaluates the condition outcome. */
 144
 145 int dmarc_process() {
 146     int sr, origin; /* used in SPF section */
 147     pdkim_signature *sig  = NULL;
 148     BOOL has_dmarc_record = TRUE;
 149     u_char **ruf; /* forensic report addressees, if called for */
 150
 151   /* ACLs have "control=dmarc_disable_verify" */
 152   if (dmarc_disable_verify == TRUE)
 153   {
 154     dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
 155     return OK;
 156   }
 157
 158   /* Store the header From: sender domain for this part of DMARC.
 159    * If there is no from_header struct, then it's likely this message
 160    * is locally generated and relying on fixups to add it.  Just skip
 161    * the entire DMARC system if we can't find a From: header....or if
 162    * there was a previous error.
 163    */
 164   if (from_header == NULL || dmarc_abort == TRUE)
 165     dmarc_abort = TRUE;
 166   else
 167   {
 168     /* I strongly encourage anybody who can make this better to contact me directly!
 169      * <cannonball> Is this an insane way to extract the email address from the From: header?
 170      * <jgh_hm> it's sure a horrid layer-crossing....
 171      * <cannonball> I'm not denying that :-/
 172      * <jgh_hm> there may well be no better though
 173      */
 174     header_from_sender = expand_string(
 175                            string_sprintf("${domain:${extract{1}{:}{${addresses:%s}}}}",
 176                              from_header->text) );
 177     /* The opendmarc library extracts the domain from the email address, but
 178      * only try to store it if it's not empty.  Otherwise, skip out of DMARC. */
 179     if (strcmp( CCS header_from_sender, "") == 0)
 180       dmarc_abort = TRUE;
 181     libdm_status = (dmarc_abort == TRUE) ?
 182                    DMARC_PARSE_OKAY :
 183                    opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender);
 184     if (libdm_status != DMARC_PARSE_OKAY)
 185     {
 186       log_write(0, LOG_MAIN|LOG_PANIC, "failure to store header From: in DMARC: %s, header was '%s'",
 187                            opendmarc_policy_status_to_str(libdm_status), from_header->text);
 188       dmarc_abort = TRUE;
 189     }
 190   }
 191
 192   /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should
 193    * instead do this in the ACLs.  */
 194   if (dmarc_abort == FALSE && sender_host_authenticated == NULL)
 195   {
 196     /* Use the envelope sender domain for this part of DMARC */
 197     spf_sender_domain = expand_string(US"$sender_address_domain");
 198     if ( spf_response == NULL )
 199     {
 200       /* No spf data means null envelope sender so generate a domain name
 201        * from the sender_host_name || sender_helo_name  */
 202       if (spf_sender_domain == NULL)
 203       {
 204         spf_sender_domain = (sender_host_name == NULL) ? sender_helo_name : sender_host_name;
 205         uschar *subdomain = spf_sender_domain;
 206         int count = 0;
 207         while (subdomain && *subdomain != '.')
 208         {
 209           subdomain++;
 210           count++;
 211         }
 212         /* If parsed characters in temp var "subdomain" and is pointing to
 213          * a period now, get rid of the period and use that.  Otherwise
 214          * will use whatever was first set in spf_sender_domain.  Goal is to
 215          * generate a sane answer, not necessarily the right/best answer b/c
 216          * at this point with a null sender, it's a bounce message, making
 217          * the spf domain be subjective.  */
 218         if (count > 0 && *subdomain == '.')
 219         {
 220           subdomain++;
 221           spf_sender_domain = subdomain;
 222         }
 223         log_write(0, LOG_MAIN, "DMARC using synthesized SPF sender domain = %s\n",
 224                                spf_sender_domain);
 225         DEBUG(D_receive)
 226           debug_printf("DMARC using synthesized SPF sender domain = %s\n", spf_sender_domain);
 227       }
 228       dmarc_spf_result = DMARC_POLICY_SPF_OUTCOME_NONE;
 229       origin = DMARC_POLICY_SPF_ORIGIN_HELO;
 230       spf_human_readable = US"";
 231     }
 232     else
 233     {
 234       sr = spf_response->result;
 235       dmarc_spf_result = (sr == SPF_RESULT_NEUTRAL)  ? DMARC_POLICY_SPF_OUTCOME_NONE :
 236                          (sr == SPF_RESULT_PASS)     ? DMARC_POLICY_SPF_OUTCOME_PASS :
 237                          (sr == SPF_RESULT_FAIL)     ? DMARC_POLICY_SPF_OUTCOME_FAIL :
 238                          (sr == SPF_RESULT_SOFTFAIL) ? DMARC_POLICY_SPF_OUTCOME_TMPFAIL :
 239                          DMARC_POLICY_SPF_OUTCOME_NONE;
 240       origin = DMARC_POLICY_SPF_ORIGIN_MAILFROM;
 241       spf_human_readable = (uschar *)spf_response->header_comment;
 242       DEBUG(D_receive)
 243         debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain);
 244     }
 245     if (strcmp( CCS spf_sender_domain, "") == 0)
 246       dmarc_abort = TRUE;
 247     if (dmarc_abort == FALSE)
 248     {
 249       libdm_status = opendmarc_policy_store_spf(dmarc_pctx, spf_sender_domain,
 250                                                 dmarc_spf_result, origin, spf_human_readable);
 251       if (libdm_status != DMARC_PARSE_OKAY)
 252         log_write(0, LOG_MAIN|LOG_PANIC, "failure to store spf for DMARC: %s",
 253                              opendmarc_policy_status_to_str(libdm_status));
 254     }
 255
 256     /* Now we cycle through the dkim signature results and put into
 257      * the opendmarc context, further building the DMARC reply.  */
 258     sig = dkim_signatures;
 259     dkim_history_buffer = US"";
 260     while (sig != NULL)
 261     {
 262       int dkim_result, vs;
 263       vs = sig->verify_status;
 264       dkim_result = ( vs == PDKIM_VERIFY_PASS ) ? DMARC_POLICY_DKIM_OUTCOME_PASS :
 265                     ( vs == PDKIM_VERIFY_FAIL ) ? DMARC_POLICY_DKIM_OUTCOME_FAIL :
 266                     ( vs == PDKIM_VERIFY_INVALID ) ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL :
 267                     DMARC_POLICY_DKIM_OUTCOME_NONE;
 268       libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, (uschar *)sig->domain,
 269                                                  dkim_result, US"");
 270       DEBUG(D_receive)
 271         debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain);
 272       if (libdm_status != DMARC_PARSE_OKAY)
 273         log_write(0, LOG_MAIN|LOG_PANIC, "failure to store dkim (%s) for DMARC: %s",
 274                              sig->domain, opendmarc_policy_status_to_str(libdm_status));
 275
 276       dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer,
 277                                                              sig->domain, dkim_result);
 278       sig = sig->next;
 279     }
 280     libdm_status = opendmarc_policy_query_dmarc(dmarc_pctx, US"");
 281     switch (libdm_status)
 282     {
 283       case DMARC_DNS_ERROR_NXDOMAIN:
 284       case DMARC_DNS_ERROR_NO_RECORD:
 285         DEBUG(D_receive)
 286           debug_printf("DMARC no record found for %s\n", header_from_sender);
 287         has_dmarc_record = FALSE;
 288         break;
 289       case DMARC_PARSE_OKAY:
 290         DEBUG(D_receive)
 291           debug_printf("DMARC record found for %s\n", header_from_sender);
 292         break;
 293       case DMARC_PARSE_ERROR_BAD_VALUE:
 294         DEBUG(D_receive)
 295           debug_printf("DMARC record parse error for %s\n", header_from_sender);
 296         has_dmarc_record = FALSE;
 297         break;
 298       default:
 299         /* everything else, skip dmarc */
 300         DEBUG(D_receive)
 301           debug_printf("DMARC skipping (%d), unsure what to do with %s",
 302                         libdm_status, from_header->text);
 303         has_dmarc_record = FALSE;
 304         break;
 305     }
 306     /* Can't use exim's string manipulation functions so allocate memory
 307      * for libopendmarc using its max hostname length definition. */
 308     uschar *dmarc_domain = (uschar *)calloc(DMARC_MAXHOSTNAMELEN, sizeof(uschar));
 309     libdm_status = opendmarc_policy_fetch_utilized_domain(dmarc_pctx, dmarc_domain,
 310                                                           DMARC_MAXHOSTNAMELEN-1);
 311     dmarc_used_domain = string_copy(dmarc_domain);
 312     free(dmarc_domain);
 313     if (libdm_status != DMARC_PARSE_OKAY)
 314     {
 315       log_write(0, LOG_MAIN|LOG_PANIC, "failure to read domainname used for DMARC lookup: %s",
 316                                        opendmarc_policy_status_to_str(libdm_status));
 317     }
 318     libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx);
 319     dmarc_policy = libdm_status;
 320     switch(libdm_status)
 321     {
 322       case DMARC_POLICY_ABSENT:     /* No DMARC record found */
 323         dmarc_status = US"norecord";
 324         dmarc_pass_fail = US"temperror";
 325         dmarc_status_text = US"No DMARC record";
 326         action = DMARC_RESULT_ACCEPT;
 327         break;
 328       case DMARC_FROM_DOMAIN_ABSENT:    /* No From: domain */
 329         dmarc_status = US"nofrom";
 330         dmarc_pass_fail = US"temperror";
 331         dmarc_status_text = US"No From: domain found";
 332         action = DMARC_RESULT_ACCEPT;
 333         break;
 334       case DMARC_POLICY_NONE:       /* Accept and report */
 335         dmarc_status = US"none";
 336         dmarc_pass_fail = US"none";
 337         dmarc_status_text = US"None, Accept";
 338         action = DMARC_RESULT_ACCEPT;
 339         break;
 340       case DMARC_POLICY_PASS:       /* Explicit accept */
 341         dmarc_status = US"accept";
 342         dmarc_pass_fail = US"pass";
 343         dmarc_status_text = US"Accept";
 344         action = DMARC_RESULT_ACCEPT;
 345         break;
 346       case DMARC_POLICY_REJECT:       /* Explicit reject */
 347         dmarc_status = US"reject";
 348         dmarc_pass_fail = US"fail";
 349         dmarc_status_text = US"Reject";
 350         action = DMARC_RESULT_REJECT;
 351         break;
 352       case DMARC_POLICY_QUARANTINE:       /* Explicit quarantine */
 353         dmarc_status = US"quarantine";
 354         dmarc_pass_fail = US"fail";
 355         dmarc_status_text = US"Quarantine";
 356         action = DMARC_RESULT_QUARANTINE;
 357         break;
 358       default:
 359         dmarc_status = US"temperror";
 360         dmarc_pass_fail = US"temperror";
 361         dmarc_status_text = US"Internal Policy Error";
 362         action = DMARC_RESULT_TEMPFAIL;
 363         break;
 364     }
 365
 366     libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa);
 367     if (libdm_status != DMARC_PARSE_OKAY)
 368     {
 369       log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s",
 370                                        opendmarc_policy_status_to_str(libdm_status));
 371     }
 372
 373     if (has_dmarc_record == TRUE)
 374     {
 375       log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s "
 376                              "spf_align=%s dkim_align=%s enforcement='%s'",
 377                              spf_sender_domain, dmarc_used_domain,
 378                              (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?"yes":"no",
 379                              (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?"yes":"no",
 380                              dmarc_status_text);
 381       history_file_status = dmarc_write_history_file();
 382       /* Now get the forensic reporting addresses, if any */
 383       ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1);
 384       dmarc_send_forensic_report(ruf);
 385     }
 386   }
 387
 388   /* set some global variables here */
 389   dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
 390
 391   /* shut down libopendmarc */
 392   if ( dmarc_pctx != NULL )
 393     (void) opendmarc_policy_connect_shutdown(dmarc_pctx);
 394   if ( dmarc_disable_verify == FALSE )
 395     (void) opendmarc_policy_library_shutdown(&dmarc_ctx);
 396
 397   return OK;
 398 }
 399
 400 int dmarc_write_history_file()
 401 {
 402   static int history_file_fd;
 403   ssize_t written_len;
 404   int tmp_ans;
 405   u_char **rua; /* aggregate report addressees */
 406   uschar *history_buffer = NULL;
 407
 408   if (dmarc_history_file == NULL)
 409     return DMARC_HIST_DISABLED;
 410   history_file_fd = log_create(dmarc_history_file);
 411
 412   if (history_file_fd < 0)
 413   {
 414     log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s",
 415                              dmarc_history_file);
 416     return DMARC_HIST_FILE_ERR;
 417   }
 418
 419   /* Generate the contents of the history file */
 420   history_buffer = string_sprintf("job %s\n", message_id);
 421   history_buffer = string_sprintf("%sreporter %s\n", history_buffer, primary_hostname);
 422   history_buffer = string_sprintf("%sreceived %ld\n", history_buffer, time(NULL));
 423   history_buffer = string_sprintf("%sipaddr %s\n", history_buffer, sender_host_address);
 424   history_buffer = string_sprintf("%sfrom %s\n", history_buffer, header_from_sender);
 425   history_buffer = string_sprintf("%smfrom %s\n", history_buffer,
 426                      expand_string(US"$sender_address_domain"));
 427
 428   if (spf_response != NULL)
 429     history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_result);
 430     // history_buffer = string_sprintf("%sspf -1\n", history_buffer);
 431
 432   history_buffer = string_sprintf("%s%s", history_buffer, dkim_history_buffer);
 433   history_buffer = string_sprintf("%spdomain %s\n", history_buffer, dmarc_used_domain);
 434   history_buffer = string_sprintf("%spolicy %d\n", history_buffer, dmarc_policy);
 435
 436   rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1);
 437   if (rua != NULL)
 438   {
 439     for (tmp_ans = 0; rua[tmp_ans] != NULL; tmp_ans++)
 440     {
 441       history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]);
 442     }
 443   }
 444   else
 445     history_buffer = string_sprintf("%srua -\n", history_buffer);
 446
 447   opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans);
 448   history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans);
 449
 450   opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans);
 451   history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans);
 452
 453   opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans);
 454   history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans);
 455
 456   opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
 457   history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans);
 458
 459   opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans);
 460   history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans);
 461
 462   history_buffer = string_sprintf("%salign_dkim %d\n", history_buffer, da);
 463   history_buffer = string_sprintf("%salign_spf %d\n", history_buffer, sa);
 464   history_buffer = string_sprintf("%saction %d\n", history_buffer, action);
 465
 466   /* Write the contents to the history file */
 467   DEBUG(D_receive)
 468     debug_printf("DMARC logging history data for opendmarc reporting%s\n",
 469                  (host_checking || running_in_test_harness) ? " (not really)" : "");
 470   if (host_checking || running_in_test_harness)
 471   {
 472     DEBUG(D_receive)
 473       debug_printf("DMARC history data for debugging:\n%s", history_buffer);
 474   }
 475   else
 476   {
 477     written_len = write_to_fd_buf(history_file_fd,
 478                                   history_buffer,
 479                                   Ustrlen(history_buffer));
 480     if (written_len == 0)
 481     {
 482       log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s",
 483                              dmarc_history_file);
 484       return DMARC_HIST_WRITE_ERR;
 485     }
 486     (void)close(history_file_fd);
 487   }
 488   return DMARC_HIST_OK;
 489 }
 490
 491 void dmarc_send_forensic_report(u_char **ruf)
 492 {
 493   int   c;
 494   uschar *recipient, *save_sender;
 495   BOOL  send_status = FALSE;
 496   error_block *eblock = NULL;
 497   FILE *message_file = NULL;
 498
 499   /* Earlier ACL does not have *required* control=dmarc_enable_forensic */
 500   if (dmarc_enable_forensic == FALSE)
 501     return;
 502
 503   if ((dmarc_policy == DMARC_POLICY_REJECT     && action == DMARC_RESULT_REJECT) ||
 504       (dmarc_policy == DMARC_POLICY_QUARANTINE && action == DMARC_RESULT_QUARANTINE) )
 505   {
 506     if (ruf != NULL)
 507     {
 508       eblock = add_to_eblock(eblock, US"Sender Domain", dmarc_used_domain);
 509       eblock = add_to_eblock(eblock, US"Sender IP Address", sender_host_address);
 510       eblock = add_to_eblock(eblock, US"Received Date", tod_stamp(tod_full));
 511       eblock = add_to_eblock(eblock, US"SPF Alignment",
 512                              (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?US"yes":US"no");
 513       eblock = add_to_eblock(eblock, US"DKIM Alignment",
 514                              (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?US"yes":US"no");
 515       eblock = add_to_eblock(eblock, US"DMARC Results", dmarc_status_text);
 516       /* Set a sane default envelope sender */
 517       dsn_from = dmarc_forensic_sender ? dmarc_forensic_sender :
 518                  dsn_from ? dsn_from :
 519                  string_sprintf("do-not-reply@%s",primary_hostname);
 520       for (c = 0; ruf[c] != NULL; c++)
 521       {
 522         recipient = string_copylc(ruf[c]);
 523         if (Ustrncmp(recipient, "mailto:",7))
 524         continue;
 525         /* Move to first character past the colon */
 526         recipient += 7;
 527         DEBUG(D_receive)
 528           debug_printf("DMARC forensic report to %s%s\n", recipient,
 529                        (host_checking || running_in_test_harness) ? " (not really)" : "");
 530         if (host_checking || running_in_test_harness)
 531           continue;
 532         save_sender = sender_address;
 533         sender_address = recipient;
 534         send_status = moan_to_sender(ERRMESS_DMARC_FORENSIC, eblock,
 535                                      header_list, message_file, FALSE);
 536         sender_address = save_sender;
 537         if (send_status == FALSE)
 538           log_write(0, LOG_MAIN|LOG_PANIC, "failure to send DMARC forensic report to %s",
 539                     recipient);
 540       }
 541     }
 542   }
 543 }
 544
 545 uschar *dmarc_exim_expand_query(int what)
 546 {
 547   if (dmarc_disable_verify || !dmarc_pctx)
 548     return dmarc_exim_expand_defaults(what);
 549
 550   switch(what) {
 551     case DMARC_VERIFY_STATUS:
 552       return(dmarc_status);
 553     default:
 554       return US"";
 555   }
 556 }
 557
 558 uschar *dmarc_exim_expand_defaults(int what)
 559 {
 560   switch(what) {
 561     case DMARC_VERIFY_STATUS:
 562       return (dmarc_disable_verify) ?
 563               US"off" :
 564               US"none";
 565     default:
 566       return US"";
 567   }
 568 }
 569
 570 uschar *dmarc_auth_results_header(header_line *from_header, uschar *hostname)
 571 {
 572   uschar *hdr_tmp    = US"";
 573
 574   /* Allow a server hostname to be passed to this function, but is
 575    * currently unused */
 576   if (hostname == NULL)
 577     hostname = primary_hostname;
 578   hdr_tmp = string_sprintf("%s %s;", DMARC_AR_HEADER, hostname);
 579
 580 #if 0
 581   /* I don't think this belongs here, but left it here commented out
 582    * because it was a lot of work to get working right. */
 583   if (spf_response != NULL) {
 584     uschar *dmarc_ar_spf = US"";
 585     int sr               = 0;
 586     sr = spf_response->result;
 587     dmarc_ar_spf = (sr == SPF_RESULT_NEUTRAL)  ? US"neutral" :
 588                    (sr == SPF_RESULT_PASS)     ? US"pass" :
 589                    (sr == SPF_RESULT_FAIL)     ? US"fail" :
 590                    (sr == SPF_RESULT_SOFTFAIL) ? US"softfail" :
 591                    US"none";
 592     hdr_tmp = string_sprintf("%s spf=%s (%s) smtp.mail=%s;",
 593                              hdr_tmp, dmarc_ar_spf_result,
 594                              spf_response->header_comment,
 595                              expand_string(US"$sender_address") );
 596   }
 597 #endif
 598   hdr_tmp = string_sprintf("%s dmarc=%s",
 599                            hdr_tmp, dmarc_pass_fail);
 600   if (header_from_sender)
 601     hdr_tmp = string_sprintf("%s header.from=%s",
 602                              hdr_tmp, header_from_sender);
 603   return hdr_tmp;
 604 }
 605
 606 #endif /* EXPERIMENTAL_SPF */
 607 #endif /* EXPERIMENTAL_DMARC */
 608
 609 // vim:sw=2 expandtab