diff options
Diffstat (limited to 'src/IO/ssl.c')
| -rw-r--r-- | src/IO/ssl.c | 1110 |
1 files changed, 0 insertions, 1110 deletions
diff --git a/src/IO/ssl.c b/src/IO/ssl.c deleted file mode 100644 index 856d94b5..00000000 --- a/src/IO/ssl.c +++ /dev/null @@ -1,1110 +0,0 @@ -/* - * File: ssl.c - * - * Copyright 2004 Garrett Kajmowicz <gkajmowi@tbaytel.net> - * (for some bits derived from the https dpi, e.g., certificate handling) - * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, - * 2009, 2010, 2011, 2012 Free Software Foundation, Inc. - * (for the certificate hostname checking from wget) - * Copyright (C) 2011 Benjamin Johnson <obeythepenguin@users.sourceforge.net> - * (for the https code offered from dplus browser that formed the basis...) - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 3 of the License, or - * (at your option) any later version. - * - * As a special exception, permission is granted to link Dillo with the OpenSSL - * or LibreSSL library, and distribute the linked executables without - * including the source code for OpenSSL or LibreSSL in the source - * distribution. You must obey the GNU General Public License, version 3, in - * all respects for all of the code used other than OpenSSL or LibreSSL. - */ - -/* https://www.ssllabs.com/ssltest/viewMyClient.html */ - -/* - * Using TLS in Applications: http://datatracker.ietf.org/wg/uta/documents/ - * TLS: http://datatracker.ietf.org/wg/tls/documents/ - */ - -#include "config.h" -#include "../msg.h" - -#ifndef ENABLE_SSL - -void a_Ssl_init() -{ - MSG("SSL: Disabled at compilation time.\n"); -} - -#else - -#include <assert.h> - -#include <sys/stat.h> -#include <sys/types.h> - -#include <ctype.h> /* tolower for wget stuff */ -#include <stdio.h> -#include <errno.h> -#include "../../dlib/dlib.h" -#include "../dialog.hh" -#include "../klist.h" -#include "iowatch.hh" -#include "ssl.h" -#include "Url.h" - -#include <openssl/ssl.h> -#include <openssl/rand.h> -#include <openssl/err.h> -#include <openssl/x509v3.h> /* for hostname checking */ - -#define CERT_STATUS_NONE 0 -#define CERT_STATUS_RECEIVING 1 -#define CERT_STATUS_GOOD 2 -#define CERT_STATUS_BAD 3 -#define CERT_STATUS_USER_ACCEPTED 4 - -typedef struct { - char *hostname; - int port; - int cert_status; -} Server_t; - -typedef struct { - int fd; - int connkey; -} FdMapEntry_t; - -/* - * Data type for SSL connection information - */ -typedef struct { - int fd; - DilloUrl *url; - SSL *ssl; - bool_t connecting; -} Conn_t; - -/* List of active SSL connections */ -static Klist_t *conn_list = NULL; - -/* - * If ssl_context is still NULL, this corresponds to SSL being disabled. - */ -static SSL_CTX *ssl_context; -static Dlist *servers; -static Dlist *fd_map; - -static void Ssl_connect_cb(int fd, void *vssl); - -/* - * Compare by FD. - */ -static int Ssl_fd_map_cmp(const void *v1, const void *v2) -{ - int fd = VOIDP2INT(v2); - const FdMapEntry_t *e = v1; - - return (fd != e->fd); -} - -static void Ssl_fd_map_add_entry(int fd, int connkey) -{ - FdMapEntry_t *e = dNew0(FdMapEntry_t, 1); - e->fd = fd; - e->connkey = connkey; - - if (dList_find_custom(fd_map, INT2VOIDP(e->fd), Ssl_fd_map_cmp)) { - MSG_ERR("SSL FD ENTRY ALREADY FOUND FOR %d\n", e->fd); - assert(0); - } - - dList_append(fd_map, e); -//MSG("ADD ENTRY %d %s\n", e->fd, URL_STR(sd->url)); -} - -/* - * Remove and free entry from fd_map. - */ -static void Ssl_fd_map_remove_entry(int fd) -{ - void *data = dList_find_custom(fd_map, INT2VOIDP(fd), Ssl_fd_map_cmp); - -//MSG("REMOVE ENTRY %d\n", fd); - if (data) { - dList_remove_fast(fd_map, data); - dFree(data); - } else { - MSG("SSL FD ENTRY NOT FOUND FOR %d\n", fd); - } -} - -/* - * Return SSL connection information for a given file - * descriptor, or NULL if no SSL connection was found. - */ -void *a_Ssl_connection(int fd) -{ - Conn_t *conn; - - if (fd_map) { - FdMapEntry_t *fme = dList_find_custom(fd_map, INT2VOIDP(fd), - Ssl_fd_map_cmp); - - if (fme && (conn = a_Klist_get_data(conn_list, fme->connkey))) - return conn; - } - return NULL; -} - -/* - * Add a new SSL connection information node. - */ -static int Ssl_conn_new(int fd, const DilloUrl *url, SSL *ssl) -{ - int key; - - Conn_t *conn = dNew0(Conn_t, 1); - conn->fd = fd; - conn->url = a_Url_dup(url); - conn->ssl = ssl; - conn->connecting = TRUE; - - key = a_Klist_insert(&conn_list, conn); - - Ssl_fd_map_add_entry(fd, key); - - return key; -} - -/* - * Let's monitor for ssl alerts. - */ -static void Ssl_info_cb(const SSL *ssl, int where, int ret) -{ - if (where & SSL_CB_ALERT) { - MSG("SSL ALERT on %s: %s\n", (where & SSL_CB_READ) ? "read" : "write", - SSL_alert_desc_string_long(ret)); - } -} - -/* - * Load trusted certificates. - * This is like using SSL_CTX_load_verify_locations() but permitting more - * than one bundle and more than one directory. Due to the notoriously - * abysmal openssl documentation, this was worked out from reading discussion - * on the web and then reading openssl source to see what it normally does. - */ -static void Ssl_load_certificates() -{ - /* curl-7.37.1 says that the following bundle locations are used on "Debian - * systems", "Redhat and Mandriva", "old(er) Redhat", "FreeBSD", and - * "OpenBSD", respectively -- and that the /etc/ssl/certs/ path is needed on - * "SUSE". No doubt it's all changed some over time, but this gives us - * something to work with. - */ - uint_t u; - char *userpath; - static const char *ca_files[] = { - "/etc/ssl/certs/ca-certificates.crt", - "/etc/pki/tls/certs/ca-bundle.crt", - "/usr/share/ssl/certs/ca-bundle.crt", - "/usr/local/share/certs/ca-root.crt", - "/etc/ssl/cert.pem", - CA_CERTS_FILE - }; - - static const char *ca_paths[] = { - "/etc/ssl/certs/", - CA_CERTS_DIR - }; - - X509_STORE *store = SSL_CTX_get_cert_store(ssl_context); - X509_LOOKUP *lookup = X509_STORE_add_lookup(store, X509_LOOKUP_file()); - - for (u = 0; u < sizeof(ca_files) / sizeof(ca_files[0]); u++) { - if (*ca_files[u]) - X509_LOOKUP_load_file(lookup, ca_files[u], X509_FILETYPE_PEM); - } - - lookup = X509_STORE_add_lookup(store, X509_LOOKUP_hash_dir()); - for (u = 0; u < sizeof(ca_paths)/sizeof(ca_paths[0]); u++) { - if (*ca_paths[u]) - X509_LOOKUP_add_dir(lookup, ca_paths[u], X509_FILETYPE_PEM); - } - - userpath = dStrconcat(dGethomedir(), "/.dillo/certs/", NULL); - X509_LOOKUP_add_dir(lookup, userpath, X509_FILETYPE_PEM); - dFree(userpath); - - /* Clear out errors in the queue (file not found, etc.) */ - while(ERR_get_error()) - ; -} - -/* - * Initialize the OpenSSL library. - */ -void a_Ssl_init(void) -{ - SSL_library_init(); - SSL_load_error_strings(); - if (RAND_status() != 1) { - /* The standard solution is to provide it with more entropy, but this - * involves knowing very well that you are doing exactly the right thing. - */ - MSG_ERR("Disabling HTTPS: Insufficient entropy for openssl.\n"); - return; - } - - /* Create SSL context */ - ssl_context = SSL_CTX_new(SSLv23_client_method()); - if (ssl_context == NULL) { - MSG_ERR("Disabling HTTPS: Error creating SSL context.\n"); - return; - } - - SSL_CTX_set_info_callback(ssl_context, Ssl_info_cb); - - /* Don't want: eNULL, which has no encryption; aNULL, which has no - * authentication; LOW, which as of 2014 use 64 or 56-bit encryption; - * EXPORT40, which uses 40-bit encryption; RC4, for which methods were - * found in 2013 to defeat it somewhat too easily. - */ - SSL_CTX_set_cipher_list(ssl_context, - "ALL:!aNULL:!eNULL:!LOW:!EXPORT40:!RC4"); - - /* SSL2 has been known to be insecure forever, disabling SSL3 is in response - * to POODLE, and disabling compression is in response to CRIME. - */ - SSL_CTX_set_options(ssl_context, - SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3|SSL_OP_NO_COMPRESSION); - - /* This lets us deal with self-signed certificates */ - SSL_CTX_set_verify(ssl_context, SSL_VERIFY_NONE, NULL); - - Ssl_load_certificates(); - - fd_map = dList_new(20); - servers = dList_new(8); -} - -/* - * Save certificate with a hashed filename. - * Return: 0 on success, 1 on failure. - */ -static int Ssl_save_certificate_home(X509 * cert) -{ - char buf[4096]; - - FILE * fp = NULL; - uint_t i = 0; - int ret = 1; - - /* Attempt to create .dillo/certs blindly - check later */ - snprintf(buf, 4096, "%s/.dillo/", dGethomedir()); - mkdir(buf, 01777); - snprintf(buf, 4096, "%s/.dillo/certs/", dGethomedir()); - mkdir(buf, 01777); - - do { - snprintf(buf, 4096, "%s/.dillo/certs/%lx.%u", - dGethomedir(), X509_subject_name_hash(cert), i); - - fp=fopen(buf, "r"); - if (fp == NULL){ - /* File name doesn't exist so we can use it safely */ - fp=fopen(buf, "w"); - if (fp == NULL){ - MSG("Unable to open cert save file in home dir\n"); - break; - } else { - PEM_write_X509(fp, cert); - fclose(fp); - MSG("Wrote certificate\n"); - ret = 0; - break; - } - } else { - fclose(fp); - } - i++; - /* Don't loop too many times - just give up */ - } while (i < 1024); - - return ret; -} - -/* - * Test whether a URL corresponds to a server. - */ -static int Ssl_servers_cmp(const void *v1, const void *v2) -{ - Server_t *s = (Server_t *)v1; - const DilloUrl *url = (const DilloUrl *)v2; - const char *host = URL_HOST(url); - int port = URL_PORT(url); - - return (dStrAsciiCasecmp(s->hostname, host) || (port != s->port)); -} - -/* - * The purpose here is to permit a single initial connection to a server. - * Once we have the certificate, know whether we like it -- and whether the - * user accepts it -- HTTP can run through queued sockets as normal. - * - * Return: 1 means yes, 0 means not yet, -1 means never. - * TODO: Something clearer or different. - */ -int a_Ssl_connect_ready(const DilloUrl *url) -{ - Server_t *s; - int i, len; - const char *host = URL_HOST(url); - const int port = URL_PORT(url); - int ret = SSL_CONNECT_READY; - - dReturn_val_if_fail(ssl_context, SSL_CONNECT_NEVER); - - len = dList_length(servers); - - for (i = 0; i < len; i++) { - s = dList_nth_data(servers, i); - - if (!dStrAsciiCasecmp(s->hostname, host) && (port == s->port)) { - if (s->cert_status == CERT_STATUS_RECEIVING) - ret = SSL_CONNECT_NOT_YET; - else if (s->cert_status == CERT_STATUS_BAD) - ret = SSL_CONNECT_NEVER; - - if (s->cert_status == CERT_STATUS_NONE) - s->cert_status = CERT_STATUS_RECEIVING; - return ret; - } - } - s = dNew(Server_t, 1); - - s->port = port; - s->hostname = dStrdup(host); - s->cert_status = CERT_STATUS_RECEIVING; - dList_append(servers, s); - return ret; -} - -/* - * Did we find problems with the certificate, and did the user proceed to - * reject the connection? - */ -static int Ssl_user_said_no(const DilloUrl *url) -{ - Server_t *s = dList_find_custom(servers, url, Ssl_servers_cmp); - - if (!s) - return FALSE; - - return s->cert_status == CERT_STATUS_BAD; -} - -/* - * Did we find problems with the certificate, and did the user proceed to - * accept the connection anyway? - */ -static int Ssl_user_said_yes(const DilloUrl *url) -{ - Server_t *s = dList_find_custom(servers, url, Ssl_servers_cmp); - - if (!s) - return FALSE; - - return s->cert_status == CERT_STATUS_USER_ACCEPTED; -} - -/******************** BEGINNING OF STUFF DERIVED FROM wget-1.16.3 */ - -#define ASTERISK_EXCLUDES_DOT /* mandated by rfc2818 */ - -/* Return true is STRING (case-insensitively) matches PATTERN, false - otherwise. The recognized wildcard character is "*", which matches - any character in STRING except ".". Any number of the "*" wildcard - may be present in the pattern. - - This is used to match of hosts as indicated in rfc2818: "Names may - contain the wildcard character * which is considered to match any - single domain name component or component fragment. E.g., *.a.com - matches foo.a.com but not bar.foo.a.com. f*.com matches foo.com but - not bar.com [or foo.bar.com]." - - If the pattern contain no wildcards, pattern_match(a, b) is - equivalent to !strcasecmp(a, b). */ - -static bool_t pattern_match (const char *pattern, const char *string) -{ - - const char *p = pattern, *n = string; - char c; - for (; (c = tolower (*p++)) != '\0'; n++) - if (c == '*') - { - for (c = tolower (*p); c == '*'; c = tolower (*++p)) - ; - for (; *n != '\0'; n++) - if (tolower (*n) == c && pattern_match (p, n)) - return TRUE; -#ifdef ASTERISK_EXCLUDES_DOT - else if (*n == '.') - return FALSE; -#endif - return c == '\0'; - } - else - { - if (c != tolower (*n)) - return FALSE; - } - return *n == '\0'; -} - -static bool_t Ssl_check_cert_hostname(X509 *cert, const DilloUrl *url, - int *choice) -{ - dReturn_val_if_fail(cert && url, -1); - - char *msg; - const char *host = URL_HOST(url); - GENERAL_NAMES *subjectAltNames; - bool_t success = TRUE, alt_name_checked = FALSE;; - char common_name[256]; - - /* Check that HOST matches the common name in the certificate. - #### The following remains to be done: - - - When matching against common names, it should loop over all - common names and choose the most specific one, i.e. the last - one, not the first one, which the current code picks. - - - Ensure that ASN1 strings from the certificate are encoded as - UTF-8 which can be meaningfully compared to HOST. */ - - subjectAltNames = X509_get_ext_d2i (cert, NID_subject_alt_name, NULL, NULL); - - if (subjectAltNames) - { - /* Test subject alternative names */ - - /* Do we want to check for dNSNAmes or ipAddresses (see RFC 2818)? - * Signal it by host_in_octet_string. */ - ASN1_OCTET_STRING *host_in_octet_string = a2i_IPADDRESS (host); - - int numaltnames = sk_GENERAL_NAME_num (subjectAltNames); - int i; - for (i=0; i < numaltnames; i++) - { - const GENERAL_NAME *name = - sk_GENERAL_NAME_value (subjectAltNames, i); - if (name) - { - if (host_in_octet_string) - { - if (name->type == GEN_IPADD) - { - /* Check for ipAddress */ - /* TODO: Should we convert between IPv4-mapped IPv6 - * addresses and IPv4 addresses? */ - alt_name_checked = TRUE; - if (!ASN1_STRING_cmp (host_in_octet_string, - name->d.iPAddress)) - break; - } - } - else if (name->type == GEN_DNS) - { - /* dNSName should be IA5String (i.e. ASCII), however who - * does trust CA? Convert it into UTF-8 for sure. */ - unsigned char *name_in_utf8 = NULL; - - /* Check for dNSName */ - alt_name_checked = TRUE; - - if (0 <= ASN1_STRING_to_UTF8 (&name_in_utf8, name->d.dNSName)) - { - /* Compare and check for NULL attack in ASN1_STRING */ - if (pattern_match ((char *)name_in_utf8, host) && - (strlen ((char *)name_in_utf8) == - (size_t)ASN1_STRING_length (name->d.dNSName))) - { - OPENSSL_free (name_in_utf8); - break; - } - OPENSSL_free (name_in_utf8); - } - } - } - } - sk_GENERAL_NAME_pop_free(subjectAltNames, GENERAL_NAME_free); - if (host_in_octet_string) - ASN1_OCTET_STRING_free(host_in_octet_string); - - if (alt_name_checked == TRUE && i >= numaltnames) - { - success = FALSE; - msg = dStrconcat("No certificate subject alternative name matches" - " requested host name \n", host, NULL); - *choice = a_Dialog_choice("Dillo SSL security warning", - msg, "Continue", "Cancel", NULL); - dFree(msg); - - switch (*choice){ - case 1: - success = TRUE; - break; - case 2: - break; - default: - break; - } - } - } - - if (alt_name_checked == FALSE) - { - /* Test commomName */ - X509_NAME *xname = X509_get_subject_name(cert); - common_name[0] = '\0'; - X509_NAME_get_text_by_NID (xname, NID_commonName, common_name, - sizeof (common_name)); - - if (!pattern_match (common_name, host)) - { - success = FALSE; - msg = dStrconcat("Certificate common name ", common_name, - " doesn't match requested host name ", host, NULL); - *choice = a_Dialog_choice("Dillo SSL security warning", - msg, "Continue", "Cancel", NULL); - dFree(msg); - - switch (*choice){ - case 1: - success = TRUE; - break; - case 2: - break; - default: - break; - } - } - else - { - /* We now determine the length of the ASN1 string. If it - * differs from common_name's length, then there is a \0 - * before the string terminates. This can be an instance of a - * null-prefix attack. - * - * https://www.blackhat.com/html/bh-usa-09/bh-usa-09-archives.html#Marlinspike - * */ - - int i = -1, j; - X509_NAME_ENTRY *xentry; - ASN1_STRING *sdata; - - if (xname) { - for (;;) - { - j = X509_NAME_get_index_by_NID (xname, NID_commonName, i); - if (j == -1) break; - i = j; - } - } - - xentry = X509_NAME_get_entry(xname,i); - sdata = X509_NAME_ENTRY_get_data(xentry); - if (strlen (common_name) != (size_t)ASN1_STRING_length (sdata)) - { - success = FALSE; - msg = dStrconcat("Certificate common name is invalid (contains a NUL " - "character). This may be an indication that the " - "host is not who it claims to be -- that is, not " - "the real ", host, NULL); - *choice = a_Dialog_choice("Dillo SSL security warning", - msg, "Continue", "Cancel", NULL); - dFree(msg); - - switch (*choice){ - case 1: - success = TRUE; - break; - case 2: - break; - default: - break; - } - } - } - } - return success; -} - -/******************** END OF STUFF DERIVED FROM wget-1.16.3 */ - -/* - * Examine the certificate, and, if problems are detected, ask the user what - * to do. - * Return: -1 if connection should be canceled, or 0 if it should continue. - */ -static int Ssl_examine_certificate(SSL *ssl, const DilloUrl *url) -{ - X509 *remote_cert; - long st; - char buf[4096], *cn, *msg; - int choice = -1, ret = -1; - char *title = dStrconcat("Dillo SSL security warning: ",URL_HOST(url),NULL); - Server_t *srv = dList_find_custom(servers, url, Ssl_servers_cmp); - - remote_cert = SSL_get_peer_certificate(ssl); - if (remote_cert == NULL){ - /* Inform user that remote system cannot be trusted */ - choice = a_Dialog_choice(title, - "The remote system is not presenting a certificate. " - "This site cannot be trusted. Sending data is not safe.", - "Continue", "Cancel", NULL); - - /* Abort on anything but "Continue" */ - if (choice == 1){ - ret = 0; - } - - } else if (Ssl_check_cert_hostname(remote_cert, url, &choice)) { - /* Figure out if (and why) the remote system can't be trusted */ - st = SSL_get_verify_result(ssl); - switch (st) { - case X509_V_OK: - ret = 0; - break; - case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: - /* Either self signed and untrusted */ - /* Extract CN from certificate name information */ - if ((cn = strstr(remote_cert->name, "/CN=")) == NULL) { - strcpy(buf, "(no CN given)"); - } else { - char *cn_end; - - cn += 4; - - if ((cn_end = strstr(cn, "/")) == NULL ) - cn_end = cn + strlen(cn); - - strncpy(buf, cn, (size_t) (cn_end - cn)); - buf[cn_end - cn] = '\0'; - } - msg = dStrconcat("The remote certificate is self-signed and " - "untrusted. For address: ", buf, NULL); - choice = a_Dialog_choice(title, - msg, "Continue", "Cancel", "Save Certificate", NULL); - dFree(msg); - - switch (choice){ - case 1: - ret = 0; - break; - case 2: - break; - case 3: - /* Save certificate to a file here and recheck the chain */ - /* Potential security problems because we are writing - * to the filesystem */ - Ssl_save_certificate_home(remote_cert); - ret = 1; - break; - default: - break; - } - break; - case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: - case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: - choice = a_Dialog_choice(title, - "The issuer for the remote certificate cannot be found. " - "The authenticity of the remote certificate cannot be trusted.", - "Continue", "Cancel", NULL); - - if (choice == 1) { - ret = 0; - } - break; - - case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: - case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: - case X509_V_ERR_CERT_SIGNATURE_FAILURE: - case X509_V_ERR_CRL_SIGNATURE_FAILURE: - choice = a_Dialog_choice(title, - "The remote certificate signature could not be read " - "or is invalid and should not be trusted", - "Continue", "Cancel", NULL); - - if (choice == 1) { - ret = 0; - } - break; - case X509_V_ERR_CERT_NOT_YET_VALID: - case X509_V_ERR_CRL_NOT_YET_VALID: - choice = a_Dialog_choice(title, - "Part of the remote certificate is not yet valid. " - "Certificates usually have a range of dates over which " - "they are to be considered valid, and the certificate " - "presented has a starting validity after today's date " - "You should be cautious about using this site", - "Continue", "Cancel", NULL); - - if (choice == 1) { - ret = 0; - } - break; - case X509_V_ERR_CERT_HAS_EXPIRED: - case X509_V_ERR_CRL_HAS_EXPIRED: - choice = a_Dialog_choice(title, - "The remote certificate has expired. The certificate " - "wasn't designed to last this long. You should avoid " - "this site.", - "Continue", "Cancel", NULL); - if (choice == 1) { - ret = 0; - } - break; - case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: - case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: - case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: - case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: - choice = a_Dialog_choice(title, - "There was an error in the certificate presented. " - "Some of the certificate data was improperly formatted " - "making it impossible to determine if the certificate " - "is valid. You should not trust this certificate.", - "Continue", "Cancel", NULL); - if (choice == 1) { - ret = 0; - } - break; - case X509_V_ERR_INVALID_CA: - case X509_V_ERR_INVALID_PURPOSE: - case X509_V_ERR_CERT_UNTRUSTED: - case X509_V_ERR_CERT_REJECTED: - case X509_V_ERR_KEYUSAGE_NO_CERTSIGN: - choice = a_Dialog_choice(title, - "One of the certificates in the chain is being used " - "incorrectly (possibly due to configuration problems " - "with the remote system. The connection should not " - "be trusted", - "Continue", "Cancel", NULL); - if (choice == 1) { - ret = 0; - } - break; - case X509_V_ERR_SUBJECT_ISSUER_MISMATCH: - case X509_V_ERR_AKID_SKID_MISMATCH: - case X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH: - choice = a_Dialog_choice(title, - "Some of the information presented by the remote system " - "does not match other information presented. " - "This may be an attempt to eavesdrop on communications", - "Continue", "Cancel", NULL); - if (choice == 1) { - ret = 0; - } - break; - case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: - choice = a_Dialog_choice(title, - "Self signed certificate in certificate chain. The certificate " - "chain could be built up using the untrusted certificates but the " - "root could not be found locally.", - "Continue", "Cancel", NULL); - if (choice == 1) { - ret = 0; - } - break; - case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: - choice = a_Dialog_choice(title, - "Unable to get local issuer certificate. The issuer certificate " - "of an untrusted certificate cannot be found.", - "Continue", "Cancel", NULL); - if (choice == 1) { - ret = 0; - } - break; - default: /* Need to add more options later */ - snprintf(buf, 80, - "The remote certificate cannot be verified (code %ld)", st); - choice = a_Dialog_choice(title, - buf, "Continue", "Cancel", NULL); - /* abort on anything but "Continue" */ - if (choice == 1){ - ret = 0; - } - } - X509_free(remote_cert); - remote_cert = 0; - } - dFree(title); - - if (choice == 2) - srv->cert_status = CERT_STATUS_BAD; - else if (choice == -1) - srv->cert_status = CERT_STATUS_GOOD; - else - srv->cert_status = CERT_STATUS_USER_ACCEPTED; - - return ret; -} - -/* - * If the connection was closed before we got the certificate, we need to - * reset state so that we'll try again. - */ -void a_Ssl_reset_server_state(const DilloUrl *url) -{ - if (servers) { - Server_t *s = dList_find_custom(servers, url, Ssl_servers_cmp); - - if (s && s->cert_status == CERT_STATUS_RECEIVING) - s->cert_status = CERT_STATUS_NONE; - } -} - -/* - * Close an open SSL connection. - */ -static void Ssl_close_by_key(int connkey) -{ - Conn_t *c; - - if ((c = a_Klist_get_data(conn_list, connkey))) { - a_Ssl_reset_server_state(c->url); - if (c->connecting) { - a_IOwatch_remove_fd(c->fd, -1); - dClose(c->fd); - } - SSL_shutdown(c->ssl); - SSL_free(c->ssl); - - a_Url_free(c->url); - Ssl_fd_map_remove_entry(c->fd); - a_Klist_remove(conn_list, connkey); - dFree(c); - } -} - -/* - * Connect, set a callback if it's still not completed. If completed, check - * the certificate and report back to http. - */ -static void Ssl_connect(int fd, int connkey) -{ - int ret; - bool_t ongoing = FALSE, failed = TRUE; - Conn_t *conn; - - if (!(conn = a_Klist_get_data(conn_list, connkey))) { - MSG("Ssl_connect: conn for fd %d not valid\n", fd); - return; - } - - assert(!ERR_get_error()); - - ret = SSL_connect(conn->ssl); - - if (ret <= 0) { - int err1_ret = SSL_get_error(conn->ssl, ret); - if (err1_ret == SSL_ERROR_WANT_READ || - err1_ret == SSL_ERROR_WANT_WRITE) { - int want = err1_ret == SSL_ERROR_WANT_READ ? DIO_READ : DIO_WRITE; - - _MSG("iowatching fd %d for ssl -- want %s\n", fd, - err1_ret == SSL_ERROR_WANT_READ ? "read" : "write"); - a_IOwatch_remove_fd(fd, -1); - a_IOwatch_add_fd(fd, want, Ssl_connect_cb, INT2VOIDP(connkey)); - ongoing = TRUE; - failed = FALSE; - } else if (err1_ret == SSL_ERROR_SYSCALL || err1_ret == SSL_ERROR_SSL) { - unsigned long err2_ret = ERR_get_error(); - - if (err2_ret) { - do { - MSG("SSL_connect() failed: %s\n", - ERR_error_string(err2_ret, NULL)); - } while ((err2_ret = ERR_get_error())); - } else { - /* nothing in the error queue */ - if (ret == 0) { - MSG("SSL connect error: \"an EOF was observed that violates " - "the protocol\"\n"); - /* - * I presume we took too long on our side and the server grew - * impatient. - */ - } else if (ret == -1) { - MSG("SSL connect error: %s\n", dStrerror(errno)); - - /* If the following can happen, I'll add code to handle it, but - * I don't want to add code blindly if it isn't getting used - */ - assert(errno != EAGAIN && errno != EINTR); - } else { - MSG_ERR("According to the man page for SSL_get_error(), this " - "was not a possibility (ret %d).\n", ret); - } - } - } else { - MSG("SSL_get_error() returned %d on a connect.\n", err1_ret); - } - } else { - if (Ssl_user_said_yes(conn->url) || - (Ssl_examine_certificate(conn->ssl, conn->url) != -1)) - failed = FALSE; - } - - /* - * If there were problems with the certificate, the connection may have - * been closed by the server if the user responded too slowly to a popup. - */ - - if (!ongoing) { - if (a_Klist_get_data(conn_list, connkey)) { - conn->connecting = FALSE; - if (failed) { - Ssl_close_by_key(connkey); - } - a_IOwatch_remove_fd(fd, DIO_READ|DIO_WRITE); - a_Http_connect_done(fd, failed ? FALSE : TRUE); - } else { - MSG("Connection disappeared. Too long with a popup popped up?\n"); - } - } -} - -static void Ssl_connect_cb(int fd, void *vconnkey) -{ - Ssl_connect(fd, VOIDP2INT(vconnkey)); -} - -/* - * Perform the SSL handshake on an open socket. - */ -void a_Ssl_handshake(int fd, const DilloUrl *url) -{ - SSL *ssl; - bool_t success = TRUE; - int connkey = -1; - - if (!ssl_context) - success = FALSE; - - if (success && Ssl_user_said_no(url)) { - success = FALSE; - } - - assert(!ERR_get_error()); - - if (success && !(ssl = SSL_new(ssl_context))) { - unsigned long err_ret = ERR_get_error(); - do { - MSG("SSL_new() failed: %s\n", ERR_error_string(err_ret, NULL)); - } while ((err_ret = ERR_get_error())); - success = FALSE; - } - - /* assign SSL connection to this file descriptor */ - if (success && !SSL_set_fd(ssl, fd)) { - unsigned long err_ret = ERR_get_error(); - do { - MSG("SSL_set_fd() failed: %s\n", ERR_error_string(err_ret, NULL)); - } while ((err_ret = ERR_get_error())); - success = FALSE; - } - - if (success) - connkey = Ssl_conn_new(fd, url, ssl); - -#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME - /* Server Name Indication. From the openssl changelog, it looks like this - * came along in 2010. - */ - if (success && !a_Url_host_is_ip(URL_HOST(url))) - SSL_set_tlsext_host_name(ssl, URL_HOST(url)); -#endif - - if (!success) { - a_Ssl_reset_server_state(url); - a_Http_connect_done(fd, success); - } else { - Ssl_connect(fd, connkey); - } -} - -/* - * Read data from an open SSL connection. - */ -int a_Ssl_read(void *conn, void *buf, size_t len) -{ - Conn_t *c = (Conn_t*)conn; - return SSL_read(c->ssl, buf, len); -} - -/* - * Write data to an open SSL connection. - */ -int a_Ssl_write(void *conn, void *buf, size_t len) -{ - Conn_t *c = (Conn_t*)conn; - return SSL_write(c->ssl, buf, len); -} - -void a_Ssl_close_by_fd(int fd) -{ - FdMapEntry_t *fme = dList_find_custom(fd_map, INT2VOIDP(fd), - Ssl_fd_map_cmp); - - if (fme) { - Ssl_close_by_key(fme->connkey); - } -} - -static void Ssl_servers_freeall() -{ - if (servers) { - Server_t *s; - int i, n = dList_length(servers); - - for (i = 0; i < n; i++) { - s = (Server_t *) dList_nth_data(servers, i); - dFree(s->hostname); - dFree(s); - } - dList_free(servers); - } -} - -static void Ssl_fd_map_remove_all() -{ - if (fd_map) { - FdMapEntry_t *fme; - int i, n = dList_length(fd_map); - - for (i = 0; i < n; i++) { - fme = (FdMapEntry_t *) dList_nth_data(fd_map, i); - dFree(fme); - } - dList_free(fd_map); - } -} - -/* - * Clean up the OpenSSL library - */ -void a_Ssl_freeall(void) -{ - if (ssl_context) - SSL_CTX_free(ssl_context); - Ssl_fd_map_remove_all(); - Ssl_servers_freeall(); -} - -#endif /* ENABLE_SSL */ |