/*XXX the caller only uses the first record if we return multiple.
-Could we hand back an allocated string?
*/
-static int
-dkim_exim_query_dns_txt(char *name, char *answer)
+static uschar *
+dkim_exim_query_dns_txt(char * name)
{
dns_answer dnsa;
dns_scan dnss;
dns_record *rr;
+gstring * g = NULL;
lookup_dnssec_authenticated = NULL;
if (dns_lookup(&dnsa, US name, T_TXT, NULL) != DNS_SUCCEED)
- return PDKIM_FAIL; /*XXX better error detail? logging? */
+ return NULL; /*XXX better error detail? logging? */
/* Search for TXT record */
while (rr_offset < rr->size)
{
uschar len = rr->data[rr_offset++];
- snprintf(answer + answer_offset,
- PDKIM_DNS_TXT_MAX_RECLEN - answer_offset,
- "%.*s", (int)len, CS (rr->data + rr_offset));
+
+ g = string_catn(g, US(rr->data + rr_offset), len);
+ if (g->ptr >= PDKIM_DNS_TXT_MAX_RECLEN)
+ goto bad;
+
rr_offset += len;
- answer_offset += len;
- if (answer_offset >= PDKIM_DNS_TXT_MAX_RECLEN)
- return PDKIM_FAIL; /*XXX better error detail? logging? */
}
- return PDKIM_OK;
+
+ /* check if this looks like a DKIM record */
+ if (strncmp(g->s, "v=", 2) != 0 || strncasecmp(g->s, "v=dkim", 6) == 0)
+ {
+ store_reset(g->s + g->ptr + 1);
+ return string_from_gstring(g);
+ }
+
+ if (g) g->ptr = 0; /* overwrite previous record */
}
-return PDKIM_FAIL; /*XXX better error detail? logging? */
+bad:
+if (g) store_reset(g);
+return NULL; /*XXX better error detail? logging? */
}
static void
dkim_exim_verify_log_sig(pdkim_signature * sig)
{
-gstring * logmsg = string_catn(NULL, "DKIM: ", 6);
+gstring * logmsg;
uschar * s;
+if (!sig) return;
+
+if ( !dkim_verify_overall
+ && dkim_verify_status
+ ? Ustrcmp(dkim_verify_status, US"pass") == 0
+ : sig->verify_status == PDKIM_VERIFY_PASS
+ )
+ dkim_verify_overall = string_copy(sig->domain);
+
+if (!LOGGING(dkim_verbose)) return;
+
+logmsg = string_catn(NULL, US"DKIM: ", 6);
if (!(s = sig->domain)) s = US"<UNSET>";
logmsg = string_append(logmsg, 2, "d=", s);
if (!(s = sig->selector)) s = US"<UNSET>";
logmsg = string_append(logmsg, 2, " s=", s);
-logmsg = string_append(logmsg, 7,
+logmsg = string_append(logmsg, 7,
" c=", sig->canon_headers == PDKIM_CANON_SIMPLE ? "simple" : "relaxed",
"/", sig->canon_body == PDKIM_CANON_SIMPLE ? "simple" : "relaxed",
" a=", dkim_sig_to_a_tag(sig),
switch (sig->verify_status)
{
case PDKIM_VERIFY_NONE:
- logmsg = string_cat(logmsg, " [not verified]");
+ logmsg = string_cat(logmsg, US" [not verified]");
break;
case PDKIM_VERIFY_INVALID:
- logmsg = string_cat(logmsg, " [invalid - ");
+ logmsg = string_cat(logmsg, US" [invalid - ");
switch (sig->verify_ext_status)
{
case PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE:
logmsg = string_cat(logmsg,
- "public key record (currently?) unavailable]");
+ US"public key record (currently?) unavailable]");
break;
case PDKIM_VERIFY_INVALID_BUFFER_SIZE:
- logmsg = string_cat(logmsg, "overlong public key record]");
+ logmsg = string_cat(logmsg, US"overlong public key record]");
break;
case PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD:
case PDKIM_VERIFY_INVALID_PUBKEY_IMPORT:
- logmsg = string_cat(logmsg, "syntax error in public key record]");
+ logmsg = string_cat(logmsg, US"syntax error in public key record]");
break;
case PDKIM_VERIFY_INVALID_SIGNATURE_ERROR:
- logmsg = string_cat(logmsg, "signature tag missing or invalid]");
+ logmsg = string_cat(logmsg, US"signature tag missing or invalid]");
break;
case PDKIM_VERIFY_INVALID_DKIM_VERSION:
- logmsg = string_cat(logmsg, "unsupported DKIM version]");
+ logmsg = string_cat(logmsg, US"unsupported DKIM version]");
break;
default:
- logmsg = string_cat(logmsg, "unspecified problem]");
+ logmsg = string_cat(logmsg, US"unspecified problem]");
}
break;
case PDKIM_VERIFY_FAIL:
- logmsg = string_cat(logmsg, " [verification failed - ");
+ logmsg = string_cat(logmsg, US" [verification failed - ");
switch (sig->verify_ext_status)
{
case PDKIM_VERIFY_FAIL_BODY:
logmsg = string_cat(logmsg,
- "body hash mismatch (body probably modified in transit)]");
+ US"body hash mismatch (body probably modified in transit)]");
break;
case PDKIM_VERIFY_FAIL_MESSAGE:
logmsg = string_cat(logmsg,
- "signature did not verify (headers probably modified in transit)]");
+ US"signature did not verify "
+ "(headers probably modified in transit)]");
break;
default:
- logmsg = string_cat(logmsg, "unspecified reason]");
+ logmsg = string_cat(logmsg, US"unspecified reason]");
}
break;
case PDKIM_VERIFY_PASS:
- logmsg = string_cat(logmsg, " [verification succeeded]");
+ logmsg = string_cat(logmsg, US" [verification succeeded]");
break;
}
else
logmsg = string_append(logmsg, 5,
US" [", dkim_verify_status, US" - ", dkim_verify_reason, US"]");
-log_write(0, LOG_MAIN, string_from_gstring(logmsg));
+log_write(0, LOG_MAIN, "%s", string_from_gstring(logmsg));
return;
}
-/* Log a line for "the current" signature */
-void
-dkim_exim_verify_log_item(void)
-{
-dkim_exim_verify_log_sig(dkim_cur_sig);
-}
-
-
/* Log a line for each signature */
void
dkim_exim_verify_log_all(void)
}
-void
-dkim_exim_acl_setup(uschar * id)
+
+/* Args as per dkim_exim_acl_run() below */
+static int
+dkim_acl_call(uschar * id, gstring ** res_ptr,
+ uschar ** user_msgptr, uschar ** log_msgptr)
+{
+int rc;
+DEBUG(D_receive)
+ debug_printf("calling acl_smtp_dkim for dkim_cur_signer='%s'\n", id);
+
+rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim, user_msgptr, log_msgptr);
+dkim_exim_verify_log_sig(dkim_cur_sig);
+*res_ptr = string_append_listele(*res_ptr, ':', dkim_verify_status);
+return rc;
+}
+
+
+
+/* For the given identity, run the DKIM ACL once for each matching signature.
+
+Arguments
+ id Identity to look for in dkim signatures
+ res_ptr ptr to growable string-list of status results,
+ appended to per ACL run
+ user_msgptr where to put a user error (for SMTP response)
+ log_msgptr where to put a logging message (not for SMTP response)
+
+Returns: OK access is granted by an ACCEPT verb
+ DISCARD access is granted by a DISCARD verb
+ FAIL access is denied
+ FAIL_DROP access is denied; drop the connection
+ DEFER can't tell at the moment
+ ERROR disaster
+*/
+
+int
+dkim_exim_acl_run(uschar * id, gstring ** res_ptr,
+ uschar ** user_msgptr, uschar ** log_msgptr)
{
pdkim_signature * sig;
uschar * cmp_val;
+int rc = -1;
-dkim_cur_sig = NULL;
+dkim_verify_status = US"none";
+dkim_verify_reason = US"";
dkim_cur_signer = id;
if (dkim_disable_verify || !id || !dkim_verify_ctx)
- return;
+ return OK;
-/* Find signature to run ACL on */
+/* Find signatures to run ACL on */
for (sig = dkim_signatures; sig; sig = sig->next)
if ( (cmp_val = Ustrchr(id, '@') != NULL ? US sig->identity : US sig->domain)
&& strcmpic(cmp_val, id) == 0
)
{
- dkim_cur_sig = sig;
-
/* The "dkim_domain" and "dkim_selector" expansion variables have
- related globals, since they are used in the signing code too.
- Instead of inventing separate names for verification, we set
- them here. This is easy since a domain and selector is guaranteed
- to be in a signature. The other dkim_* expansion items are
- dynamically fetched from dkim_cur_sig at expansion time (see
- function below). */
+ related globals, since they are used in the signing code too.
+ Instead of inventing separate names for verification, we set
+ them here. This is easy since a domain and selector is guaranteed
+ to be in a signature. The other dkim_* expansion items are
+ dynamically fetched from dkim_cur_sig at expansion time (see
+ function below). */
+ dkim_cur_sig = sig;
dkim_signing_domain = US sig->domain;
dkim_signing_selector = US sig->selector;
dkim_key_length = sig->sighash.len * 8;
dkim_verify_status = dkim_exim_expand_query(DKIM_VERIFY_STATUS);
dkim_verify_reason = dkim_exim_expand_query(DKIM_VERIFY_REASON);
- return;
+
+ if ((rc = dkim_acl_call(id, res_ptr, user_msgptr, log_msgptr)) != OK)
+ return rc;
}
+
+if (rc != -1)
+ return rc;
+
+/* No matching sig found. Call ACL once anyway. */
+
+dkim_cur_sig = NULL;
+return dkim_acl_call(id, res_ptr, user_msgptr, log_msgptr);
}
}
-/* Generate signatures for the given file, returning a string.
+/* Generate signatures for the given file.
If a prefix is given, prepend it to the file for the calculations.
+
+Return:
+ NULL: error; error string written
+ string: signature header(s), or a zero-length string (not an error)
*/
gstring *
pdkim_set_optional(sig,
CS dkim_sign_headers_expanded,
- dkim_identity_expanded,
+ CS dkim_identity_expanded,
pdkim_canon,
pdkim_canon, -1, 0, 0);
}
}
}
+if (!ctx.sig)
+ {
+ DEBUG(D_transport) debug_printf("DKIM: no viable signatures to use\n");
+ sigbuf = string_get(1); /* return a zero-len string */
+ goto CLEANUP;
+ }
-if (prefix)
- pdkim_feed(&ctx, prefix, Ustrlen(prefix));
+if (prefix && (pdkim_feed(&ctx, prefix, Ustrlen(prefix))) != PDKIM_OK)
+ goto pk_bad;
if (lseek(fd, off, SEEK_SET) < 0)
sread = -1;
for (sigbuf = NULL; sig; sig = sig->next)
sigbuf = string_append(sigbuf, 2, US sig->signature_header, US"\r\n");
-(void) string_from_gstring(sigbuf);
-
CLEANUP:
+ (void) string_from_gstring(sigbuf);
store_pool = old_pool;
errno = save_errno;
return sigbuf;
git://git.exim.org / exim.git / blobdiff