Mercurial > dovecot > core-2.2
view src/login-common/ssl-proxy-openssl.c @ 3863:55df57c028d4 HEAD
Added "bool" type and changed all ints that were used as booleans to bool.
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Fri, 13 Jan 2006 22:25:57 +0200 |
parents | c12df370e1b2 |
children | 928229f8b3e6 |
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/* Copyright (C) 2002 Timo Sirainen */ #include "common.h" #include "ioloop.h" #include "network.h" #include "hash.h" #include "ssl-proxy.h" #ifdef HAVE_OPENSSL #include <openssl/crypto.h> #include <openssl/x509.h> #include <openssl/pem.h> #include <openssl/ssl.h> #include <openssl/err.h> #include <openssl/rand.h> #define DOVECOT_SSL_DEFAULT_CIPHER_LIST "ALL:!LOW" enum ssl_io_action { SSL_ADD_INPUT, SSL_REMOVE_INPUT, SSL_ADD_OUTPUT, SSL_REMOVE_OUTPUT }; struct ssl_proxy { int refcount; SSL *ssl; struct ip_addr ip; int fd_ssl, fd_plain; struct io *io_ssl_read, *io_ssl_write, *io_plain_read, *io_plain_write; unsigned char plainout_buf[1024]; unsigned int plainout_size; unsigned char sslout_buf[1024]; unsigned int sslout_size; unsigned int handshaked:1; unsigned int destroyed:1; unsigned int cert_received:1; unsigned int cert_broken:1; }; static int extdata_index; static SSL_CTX *ssl_ctx; static struct hash_table *ssl_proxies; static void plain_read(void *context); static void plain_write(void *context); static void ssl_write(struct ssl_proxy *proxy); static void ssl_step(void *context); static void ssl_proxy_destroy(struct ssl_proxy *proxy); static void ssl_proxy_unref(struct ssl_proxy *proxy); static void ssl_set_io(struct ssl_proxy *proxy, enum ssl_io_action action) { switch (action) { case SSL_ADD_INPUT: if (proxy->io_ssl_read != NULL) break; proxy->io_ssl_read = io_add(proxy->fd_ssl, IO_READ, ssl_step, proxy); break; case SSL_REMOVE_INPUT: if (proxy->io_ssl_read != NULL) { io_remove(proxy->io_ssl_read); proxy->io_ssl_read = NULL; } break; case SSL_ADD_OUTPUT: if (proxy->io_ssl_write != NULL) break; proxy->io_ssl_write = io_add(proxy->fd_ssl, IO_WRITE, ssl_step, proxy); break; case SSL_REMOVE_OUTPUT: if (proxy->io_ssl_write != NULL) { io_remove(proxy->io_ssl_write); proxy->io_ssl_write = NULL; } break; } } static void plain_block_input(struct ssl_proxy *proxy, bool block) { if (block) { if (proxy->io_plain_read != NULL) { io_remove(proxy->io_plain_read); proxy->io_plain_read = NULL; } } else { if (proxy->io_plain_read == NULL) { proxy->io_plain_read = io_add(proxy->fd_plain, IO_READ, plain_read, proxy); } } } static void plain_read(void *context) { struct ssl_proxy *proxy = context; ssize_t ret; bool corked = FALSE; if (proxy->sslout_size == sizeof(proxy->sslout_buf)) { /* buffer full, block input until it's written */ plain_block_input(proxy, TRUE); return; } proxy->refcount++; while (proxy->sslout_size < sizeof(proxy->sslout_buf) && !proxy->destroyed) { ret = net_receive(proxy->fd_plain, proxy->sslout_buf + proxy->sslout_size, sizeof(proxy->sslout_buf) - proxy->sslout_size); if (ret <= 0) { if (ret < 0) ssl_proxy_destroy(proxy); break; } else { proxy->sslout_size += ret; if (!corked) { net_set_cork(proxy->fd_ssl, TRUE); corked = TRUE; } ssl_write(proxy); } } if (corked) net_set_cork(proxy->fd_ssl, FALSE); ssl_proxy_unref(proxy); } static void plain_write(void *context) { struct ssl_proxy *proxy = context; ssize_t ret; proxy->refcount++; ret = net_transmit(proxy->fd_plain, proxy->plainout_buf, proxy->plainout_size); if (ret < 0) ssl_proxy_destroy(proxy); else { proxy->plainout_size -= ret; memmove(proxy->plainout_buf, proxy->plainout_buf + ret, proxy->plainout_size); if (proxy->plainout_size > 0) { if (proxy->io_plain_write == NULL) { proxy->io_plain_write = io_add(proxy->fd_plain, IO_WRITE, plain_write, proxy); } } else { if (proxy->io_plain_write != NULL) { io_remove(proxy->io_plain_write); proxy->io_plain_write = NULL; } } ssl_set_io(proxy, SSL_ADD_INPUT); } ssl_proxy_unref(proxy); } static const char *ssl_last_error(void) { unsigned long err; char *buf; size_t err_size = 256; err = ERR_get_error(); if (err == 0) return strerror(errno); buf = t_malloc(err_size); buf[err_size-1] = '\0'; ERR_error_string_n(err, buf, err_size-1); return buf; } static void ssl_handle_error(struct ssl_proxy *proxy, int ret, const char *func) { const char *errstr; int err; err = SSL_get_error(proxy->ssl, ret); switch (err) { case SSL_ERROR_WANT_READ: ssl_set_io(proxy, SSL_ADD_INPUT); break; case SSL_ERROR_WANT_WRITE: ssl_set_io(proxy, SSL_ADD_OUTPUT); break; case SSL_ERROR_SYSCALL: /* eat up the error queue */ if (verbose_ssl) { if (ERR_peek_error() != 0) errstr = ssl_last_error(); else { if (ret == 0) errstr = "EOF"; else errstr = strerror(errno); } i_warning("%s syscall failed: %s [%s]", func, errstr, net_ip2addr(&proxy->ip)); } ssl_proxy_destroy(proxy); break; case SSL_ERROR_ZERO_RETURN: /* clean connection closing */ ssl_proxy_destroy(proxy); break; case SSL_ERROR_SSL: if (verbose_ssl) { i_warning("%s failed: %s [%s]", func, ssl_last_error(), net_ip2addr(&proxy->ip)); } ssl_proxy_destroy(proxy); break; default: i_warning("%s failed: unknown failure %d (%s) [%s]", func, err, ssl_last_error(), net_ip2addr(&proxy->ip)); ssl_proxy_destroy(proxy); break; } } static void ssl_handshake(struct ssl_proxy *proxy) { int ret; ret = SSL_accept(proxy->ssl); if (ret != 1) ssl_handle_error(proxy, ret, "SSL_accept()"); else { proxy->handshaked = TRUE; ssl_set_io(proxy, SSL_ADD_INPUT); plain_block_input(proxy, FALSE); } } static void ssl_read(struct ssl_proxy *proxy) { int ret; while (proxy->plainout_size < sizeof(proxy->plainout_buf) && !proxy->destroyed) { ret = SSL_read(proxy->ssl, proxy->plainout_buf + proxy->plainout_size, sizeof(proxy->plainout_buf) - proxy->plainout_size); if (ret <= 0) { ssl_handle_error(proxy, ret, "SSL_read()"); break; } else { proxy->plainout_size += ret; plain_write(proxy); } } } static void ssl_write(struct ssl_proxy *proxy) { int ret; ret = SSL_write(proxy->ssl, proxy->sslout_buf, proxy->sslout_size); if (ret <= 0) ssl_handle_error(proxy, ret, "SSL_write()"); else { proxy->sslout_size -= ret; memmove(proxy->sslout_buf, proxy->sslout_buf + ret, proxy->sslout_size); ssl_set_io(proxy, proxy->sslout_size > 0 ? SSL_ADD_OUTPUT : SSL_REMOVE_OUTPUT); plain_block_input(proxy, FALSE); } } static void ssl_step(void *context) { struct ssl_proxy *proxy = context; proxy->refcount++; if (!proxy->handshaked) ssl_handshake(proxy); if (proxy->handshaked) { if (proxy->plainout_size == sizeof(proxy->plainout_buf)) ssl_set_io(proxy, SSL_REMOVE_INPUT); else ssl_read(proxy); if (proxy->sslout_size == 0) ssl_set_io(proxy, SSL_REMOVE_OUTPUT); else { net_set_cork(proxy->fd_ssl, TRUE); ssl_write(proxy); net_set_cork(proxy->fd_ssl, FALSE); } } ssl_proxy_unref(proxy); } int ssl_proxy_new(int fd, struct ip_addr *ip, struct ssl_proxy **proxy_r) { struct ssl_proxy *proxy; SSL *ssl; int sfd[2]; *proxy_r = NULL; if (!ssl_initialized) { i_error("SSL support not enabled in configuration"); return -1; } ssl = SSL_new(ssl_ctx); if (ssl == NULL) { i_error("SSL_new() failed: %s", ssl_last_error()); return -1; } if (SSL_set_fd(ssl, fd) != 1) { i_error("SSL_set_fd() failed: %s", ssl_last_error()); SSL_free(ssl); return -1; } if (socketpair(AF_UNIX, SOCK_STREAM, 0, sfd) == -1) { i_error("socketpair() failed: %m"); SSL_free(ssl); return -1; } net_set_nonblock(sfd[0], TRUE); net_set_nonblock(sfd[1], TRUE); net_set_nonblock(fd, TRUE); proxy = i_new(struct ssl_proxy, 1); proxy->refcount = 2; proxy->ssl = ssl; proxy->fd_ssl = fd; proxy->fd_plain = sfd[0]; proxy->ip = *ip; SSL_set_ex_data(ssl, extdata_index, proxy); hash_insert(ssl_proxies, proxy, proxy); ssl_handshake(proxy); main_ref(); *proxy_r = proxy; return sfd[1]; } bool ssl_proxy_has_valid_client_cert(struct ssl_proxy *proxy) { return proxy->cert_received && !proxy->cert_broken; } const char *ssl_proxy_get_peer_name(struct ssl_proxy *proxy) { X509 *x509; char buf[1024]; const char *name; if (!ssl_proxy_has_valid_client_cert(proxy)) return NULL; x509 = SSL_get_peer_certificate(proxy->ssl); if (x509 == NULL) return NULL; /* we should have had it.. */ X509_NAME_oneline(X509_get_subject_name(x509), buf, sizeof(buf)); name = t_strndup(buf, sizeof(buf)); X509_free(x509); return *name == '\0' ? NULL : name; } void ssl_proxy_free(struct ssl_proxy *proxy) { ssl_proxy_unref(proxy); } static void ssl_proxy_unref(struct ssl_proxy *proxy) { if (--proxy->refcount > 0) return; i_assert(proxy->refcount == 0); SSL_free(proxy->ssl); i_free(proxy); main_unref(); } static void ssl_proxy_destroy(struct ssl_proxy *proxy) { if (proxy->destroyed) return; proxy->destroyed = TRUE; hash_remove(ssl_proxies, proxy); (void)net_disconnect(proxy->fd_ssl); (void)net_disconnect(proxy->fd_plain); if (proxy->io_ssl_read != NULL) io_remove(proxy->io_ssl_read); if (proxy->io_ssl_write != NULL) io_remove(proxy->io_ssl_write); if (proxy->io_plain_read != NULL) io_remove(proxy->io_plain_read); if (proxy->io_plain_write != NULL) io_remove(proxy->io_plain_write); ssl_proxy_unref(proxy); } static RSA *ssl_gen_rsa_key(SSL *ssl __attr_unused__, int is_export __attr_unused__, int keylength) { return RSA_generate_key(keylength, RSA_F4, NULL, NULL); } static int ssl_verify_client_cert(int preverify_ok, X509_STORE_CTX *ctx) { SSL *ssl; struct ssl_proxy *proxy; ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx()); proxy = SSL_get_ex_data(ssl, extdata_index); proxy->cert_received = TRUE; if (!preverify_ok) proxy->cert_broken = TRUE; return 1; } void ssl_proxy_init(void) { const char *cafile, *certfile, *keyfile, *paramfile, *cipher_list; unsigned char buf; cafile = getenv("SSL_CA_FILE"); certfile = getenv("SSL_CERT_FILE"); keyfile = getenv("SSL_KEY_FILE"); paramfile = getenv("SSL_PARAM_FILE"); if (certfile == NULL || keyfile == NULL || paramfile == NULL) { /* SSL support is disabled */ return; } SSL_library_init(); SSL_load_error_strings(); extdata_index = SSL_get_ex_new_index(0, "dovecot", NULL, NULL, NULL); if ((ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) i_fatal("SSL_CTX_new() failed"); SSL_CTX_set_options(ssl_ctx, SSL_OP_ALL); cipher_list = getenv("SSL_CIPHER_LIST"); if (cipher_list == NULL) cipher_list = DOVECOT_SSL_DEFAULT_CIPHER_LIST; if (SSL_CTX_set_cipher_list(ssl_ctx, cipher_list) != 1) { i_fatal("Can't set cipher list to '%s': %s", cipher_list, ssl_last_error()); } if (cafile != NULL) { if (SSL_CTX_load_verify_locations(ssl_ctx, cafile, NULL) != 1) { i_fatal("Can't load CA file %s: %s", cafile, ssl_last_error()); } } if (SSL_CTX_use_certificate_chain_file(ssl_ctx, certfile) != 1) { i_fatal("Can't load certificate file %s: %s", certfile, ssl_last_error()); } if (SSL_CTX_use_PrivateKey_file(ssl_ctx, keyfile, SSL_FILETYPE_PEM) != 1) { i_fatal("Can't load private key file %s: %s", keyfile, ssl_last_error()); } if (SSL_CTX_need_tmp_RSA(ssl_ctx)) SSL_CTX_set_tmp_rsa_callback(ssl_ctx, ssl_gen_rsa_key); if (getenv("SSL_VERIFY_CLIENT_CERT") != NULL) { SSL_CTX_set_verify(ssl_ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, ssl_verify_client_cert); } /* PRNG initialization might want to use /dev/urandom, make sure it does it before chrooting. We might not have enough entropy at the first try, so this function may fail. It's still been initialized though. */ (void)RAND_bytes(&buf, 1); ssl_proxies = hash_create(default_pool, default_pool, 0, NULL, NULL); ssl_initialized = TRUE; } void ssl_proxy_deinit(void) { struct hash_iterate_context *iter; void *key, *value; if (!ssl_initialized) return; iter = hash_iterate_init(ssl_proxies); while (hash_iterate(iter, &key, &value)) ssl_proxy_destroy(value); hash_iterate_deinit(iter); hash_destroy(ssl_proxies); SSL_CTX_free(ssl_ctx); } #endif