X-Git-Url: https://vcs.fsf.org/?p=exim.git;a=blobdiff_plain;f=src%2Fsrc%2Fdkim.c;h=70c9547ece2e8715f4e625e7efd7cec4fcbeed1d;hp=24de2bc332f090d317ed9a5f66bf20f510cef232;hb=e21a4d0042e48109cef06e48b8a73dd79d7a4330;hpb=07eeb4df55e6c0843156aedaacf32bfebe0e9eaa diff --git a/src/src/dkim.c b/src/src/dkim.c index 24de2bc33..70c9547ec 100644 --- a/src/src/dkim.c +++ b/src/src/dkim.c @@ -28,7 +28,7 @@ dns_record *rr; lookup_dnssec_authenticated = NULL; if (dns_lookup(&dnsa, US name, T_TXT, NULL) != DNS_SUCCEED) - return PDKIM_FAIL; + return PDKIM_FAIL; /*XXX better error detail? logging? */ /* Search for TXT record */ @@ -51,12 +51,12 @@ for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); rr_offset += len; answer_offset += len; if (answer_offset >= PDKIM_DNS_TXT_MAX_RECLEN) - return PDKIM_FAIL; + return PDKIM_FAIL; /*XXX better error detail? logging? */ } return PDKIM_OK; } -return PDKIM_FAIL; +return PDKIM_FAIL; /*XXX better error detail? logging? */ } @@ -69,7 +69,7 @@ pdkim_init(); void -dkim_exim_verify_init(void) +dkim_exim_verify_init(BOOL dot_stuffing) { /* There is a store-reset between header & body reception so cannot use the main pool. Any allocs done by Exim @@ -85,9 +85,12 @@ if (dkim_verify_ctx) /* Create new context */ -dkim_verify_ctx = pdkim_init_verify(&dkim_exim_query_dns_txt); +dkim_verify_ctx = pdkim_init_verify(&dkim_exim_query_dns_txt, dot_stuffing); dkim_collect_input = !!dkim_verify_ctx; +/* Start feed up with any cached data */ +receive_get_cache(); + store_pool = dkim_verify_oldpool; } @@ -95,10 +98,16 @@ store_pool = dkim_verify_oldpool; void dkim_exim_verify_feed(uschar * data, int len) { +int rc; + store_pool = POOL_PERM; if ( dkim_collect_input - && pdkim_feed(dkim_verify_ctx, (char *)data, len) != PDKIM_OK) + && (rc = pdkim_feed(dkim_verify_ctx, CS data, len)) != PDKIM_OK) + { + log_write(0, LOG_MAIN, + "DKIM: validation error: %.100s", pdkim_errstr(rc)); dkim_collect_input = FALSE; + } store_pool = dkim_verify_oldpool; } @@ -110,6 +119,7 @@ pdkim_signature *sig = NULL; int dkim_signers_size = 0; int dkim_signers_ptr = 0; dkim_signers = NULL; +int rc; store_pool = POOL_PERM; @@ -134,8 +144,12 @@ dkim_collect_input = FALSE; /* Finish DKIM operation and fetch link to signatures chain */ -if (pdkim_feed_finish(dkim_verify_ctx, &dkim_signatures) != PDKIM_OK) +if ((rc = pdkim_feed_finish(dkim_verify_ctx, &dkim_signatures)) != PDKIM_OK) + { + log_write(0, LOG_MAIN, + "DKIM: validation error: %.100s", pdkim_errstr(rc)); goto out; + } for (sig = dkim_signatures; sig; sig = sig->next) { @@ -446,10 +460,9 @@ switch (what) uschar * -dkim_exim_sign(int dkim_fd, uschar * dkim_private_key, - const uschar * dkim_domain, uschar * dkim_selector, - uschar * dkim_canon, uschar * dkim_sign_headers) +dkim_exim_sign(int dkim_fd, struct ob_dkim * dkim) { +const uschar * dkim_domain; int sep = 0; uschar *seen_items = NULL; int seen_items_size = 0; @@ -473,13 +486,12 @@ int old_pool = store_pool; store_pool = POOL_MAIN; -if (!(dkim_domain = expand_cstring(dkim_domain))) +if (!(dkim_domain = expand_cstring(dkim->dkim_domain))) { /* expansion error, do not send message. */ log_write(0, LOG_MAIN | LOG_PANIC, "failed to expand " "dkim_domain: %s", expand_string_message); - rc = NULL; - goto CLEANUP; + goto bad; } /* Set $dkim_domain expansion variable to each unique domain in list. */ @@ -512,24 +524,23 @@ while ((dkim_signing_domain = string_nextinlist(&dkim_domain, &sep, /* Set up $dkim_selector expansion variable. */ - if (!(dkim_signing_selector = expand_string(dkim_selector))) + if (!(dkim_signing_selector = expand_string(dkim->dkim_selector))) { log_write(0, LOG_MAIN | LOG_PANIC, "failed to expand " "dkim_selector: %s", expand_string_message); - rc = NULL; - goto CLEANUP; + goto bad; } /* Get canonicalization to use */ - dkim_canon_expanded = dkim_canon ? expand_string(dkim_canon) : US"relaxed"; + dkim_canon_expanded = dkim->dkim_canon + ? expand_string(dkim->dkim_canon) : US"relaxed"; if (!dkim_canon_expanded) { /* expansion error, do not send message. */ log_write(0, LOG_MAIN | LOG_PANIC, "failed to expand " "dkim_canon: %s", expand_string_message); - rc = NULL; - goto CLEANUP; + goto bad; } if (Ustrcmp(dkim_canon_expanded, "relaxed") == 0) @@ -545,24 +556,22 @@ while ((dkim_signing_domain = string_nextinlist(&dkim_domain, &sep, } dkim_sign_headers_expanded = NULL; - if (dkim_sign_headers) - if (!(dkim_sign_headers_expanded = expand_string(dkim_sign_headers))) + if (dkim->dkim_sign_headers) + if (!(dkim_sign_headers_expanded = expand_string(dkim->dkim_sign_headers))) { log_write(0, LOG_MAIN | LOG_PANIC, "failed to expand " "dkim_sign_headers: %s", expand_string_message); - rc = NULL; - goto CLEANUP; + goto bad; } /* else pass NULL, which means default header list */ /* Get private key to use. */ - if (!(dkim_private_key_expanded = expand_string(dkim_private_key))) + if (!(dkim_private_key_expanded = expand_string(dkim->dkim_private_key))) { log_write(0, LOG_MAIN | LOG_PANIC, "failed to expand " "dkim_private_key: %s", expand_string_message); - rc = NULL; - goto CLEANUP; + goto bad; } if ( Ustrlen(dkim_private_key_expanded) == 0 @@ -578,62 +587,54 @@ while ((dkim_signing_domain = string_nextinlist(&dkim_domain, &sep, /* Looks like a filename, load the private key. */ memset(big_buffer, 0, big_buffer_size); - privkey_fd = open(CS dkim_private_key_expanded, O_RDONLY); - if (privkey_fd < 0) + + if ((privkey_fd = open(CS dkim_private_key_expanded, O_RDONLY)) < 0) { log_write(0, LOG_MAIN | LOG_PANIC, "unable to open " "private key file for reading: %s", dkim_private_key_expanded); - rc = NULL; - goto CLEANUP; + goto bad; } if (read(privkey_fd, big_buffer, big_buffer_size - 2) < 0) { log_write(0, LOG_MAIN|LOG_PANIC, "unable to read private key file: %s", dkim_private_key_expanded); - rc = NULL; - goto CLEANUP; + goto bad; } (void) close(privkey_fd); dkim_private_key_expanded = big_buffer; } - ctx = pdkim_init_sign( (char *) dkim_signing_domain, - (char *) dkim_signing_selector, - (char *) dkim_private_key_expanded, - PDKIM_ALGO_RSA_SHA256); + ctx = pdkim_init_sign( CS dkim_signing_domain, + CS dkim_signing_selector, + CS dkim_private_key_expanded, + PDKIM_ALGO_RSA_SHA256, + dkim->dot_stuffed); + dkim_private_key_expanded[0] = '\0'; pdkim_set_optional(ctx, - (char *) dkim_sign_headers_expanded, + CS dkim_sign_headers_expanded, NULL, pdkim_canon, pdkim_canon, -1, 0, 0); lseek(dkim_fd, 0, SEEK_SET); - while ((sread = read(dkim_fd, &buf, 4096)) > 0) - if (pdkim_feed(ctx, buf, sread) != PDKIM_OK) - { - rc = NULL; - goto CLEANUP; - } + while ((sread = read(dkim_fd, &buf, sizeof(buf))) > 0) + if ((pdkim_rc = pdkim_feed(ctx, buf, sread)) != PDKIM_OK) + goto pk_bad; /* Handle failed read above. */ if (sread == -1) { debug_printf("DKIM: Error reading -K file.\n"); save_errno = errno; - rc = NULL; - goto CLEANUP; + goto bad; } if ((pdkim_rc = pdkim_feed_finish(ctx, &signature)) != PDKIM_OK) - { - log_write(0, LOG_MAIN|LOG_PANIC, "DKIM: signing failed (RC %d)", pdkim_rc); - rc = NULL; - goto CLEANUP; - } + goto pk_bad; sigbuf = string_append(sigbuf, &sigsize, &sigptr, 2, US signature->signature_header, US"\r\n"); @@ -651,11 +652,18 @@ else rc = US""; CLEANUP: -if (ctx) - pdkim_free_ctx(ctx); -store_pool = old_pool; -errno = save_errno; -return rc; + if (ctx) + pdkim_free_ctx(ctx); + store_pool = old_pool; + errno = save_errno; + return rc; + +pk_bad: + log_write(0, LOG_MAIN|LOG_PANIC, + "DKIM: signing failed: %.100s", pdkim_errstr(pdkim_rc)); +bad: + rc = NULL; + goto CLEANUP; } #endif