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kamailio/modules/tls/tls_domain.c

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/*
* Copyright (C) 2001-2003 FhG FOKUS
* Copyright (C) 2005,2006 iptelorg GmbH
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/**
* SIP-router TLS support :: Virtual domain configuration support
* @file
* @ingroup tls
* Module: @ref tls
*/
#include <stdlib.h>
#include <openssl/ssl.h>
#include <openssl/opensslv.h>
#if OPENSSL_VERSION_NUMBER >= 0x00907000L
# include <openssl/ui.h>
#endif
#include "../../ut.h"
#include "../../mem/shm_mem.h"
#include "../../pt.h"
#include "../../cfg/cfg.h"
#include "tls_server.h"
#include "tls_util.h"
#include "tls_mod.h"
#include "tls_init.h"
#include "tls_domain.h"
#include "tls_cfg.h"
/**
* @brief Create a new TLS domain structure
*
* Create a new domain structure in new allocated shared memory.
* @param type domain Type
* @param ip domain IP
* @param port domain port
* @return new domain
*/
tls_domain_t* tls_new_domain(int type, struct ip_addr *ip, unsigned short port)
{
tls_domain_t* d;
d = shm_malloc(sizeof(tls_domain_t));
if (d == NULL) {
ERR("Memory allocation failure\n");
return 0;
}
memset(d, '\0', sizeof(tls_domain_t));
d->type = type;
if (ip) memcpy(&d->ip, ip, sizeof(struct ip_addr));
d->port = port;
d->verify_cert = -1;
d->verify_depth = -1;
d->require_cert = -1;
return d;
}
/**
* @brief Free all memory used by TLS configuration domain
* @param d freed domain
*/
void tls_free_domain(tls_domain_t* d)
{
int i;
int procs_no;
if (!d) return;
if (d->ctx) {
procs_no=get_max_procs();
for(i = 0; i < procs_no; i++) {
if (d->ctx[i]) SSL_CTX_free(d->ctx[i]);
}
shm_free(d->ctx);
}
if (d->cipher_list.s) shm_free(d->cipher_list.s);
if (d->ca_file.s) shm_free(d->ca_file.s);
if (d->crl_file.s) shm_free(d->crl_file.s);
if (d->pkey_file.s) shm_free(d->pkey_file.s);
if (d->cert_file.s) shm_free(d->cert_file.s);
shm_free(d);
}
/**
* @brief Free TLS configuration structure
* @param cfg freed configuration
*/
void tls_free_cfg(tls_domains_cfg_t* cfg)
{
tls_domain_t* p;
while(cfg->srv_list) {
p = cfg->srv_list;
cfg->srv_list = cfg->srv_list->next;
tls_free_domain(p);
}
while(cfg->cli_list) {
p = cfg->cli_list;
cfg->cli_list = cfg->cli_list->next;
tls_free_domain(p);
}
if (cfg->srv_default) tls_free_domain(cfg->srv_default);
if (cfg->cli_default) tls_free_domain(cfg->cli_default);
}
/**
* @brief Destroy all TLS configuration data
*/
void tls_destroy_cfg(void)
{
tls_domains_cfg_t* ptr;
if (tls_domains_cfg_lock) {
lock_destroy(tls_domains_cfg_lock);
lock_dealloc(tls_domains_cfg_lock);
tls_domains_cfg_lock = 0;
}
if (tls_domains_cfg) {
while(*tls_domains_cfg) {
ptr = *tls_domains_cfg;
*tls_domains_cfg = (*tls_domains_cfg)->next;
tls_free_cfg(ptr);
}
shm_free(tls_domains_cfg);
tls_domains_cfg = 0;
}
}
/**
* @brief Generate TLS domain identifier
* @param d printed domain
* @return printed domain, with zero termination
*/
char* tls_domain_str(tls_domain_t* d)
{
static char buf[1024];
char* p;
buf[0] = '\0';
p = buf;
p = strcat(p, d->type & TLS_DOMAIN_SRV ? "TLSs<" : "TLSc<");
if (d->type & TLS_DOMAIN_DEF) {
p = strcat(p, "default>");
} else {
p = strcat(p, ip_addr2a(&d->ip));
p = strcat(p, ":");
p = strcat(p, int2str(d->port, 0));
p = strcat(p, ">");
}
return buf;
}
/**
* @brief Initialize TLS domain parameters that have not been configured yet
*
* Initialize TLS domain parameters that have not been configured from
* parent domain (usually one of default domains)
* @param d initialized domain
* @param parent parent domain
* @return 0 on success, -1 on error
*/
static int fill_missing(tls_domain_t* d, tls_domain_t* parent)
{
if (d->method == TLS_METHOD_UNSPEC) d->method = parent->method;
LOG(L_INFO, "%s: tls_method=%d\n", tls_domain_str(d), d->method);
if (d->method < 1 || d->method >= TLS_METHOD_MAX) {
ERR("%s: Invalid TLS method value\n", tls_domain_str(d));
return -1;
}
if (!d->cert_file.s) {
if (shm_asciiz_dup(&d->cert_file.s, parent->cert_file.s) < 0)
return -1;
d->cert_file.len = parent->cert_file.len;
}
LOG(L_INFO, "%s: certificate='%s'\n", tls_domain_str(d), d->cert_file.s);
if (!d->ca_file.s){
if (shm_asciiz_dup(&d->ca_file.s, parent->ca_file.s) < 0)
return -1;
d->ca_file.len = parent->ca_file.len;
}
LOG(L_INFO, "%s: ca_list='%s'\n", tls_domain_str(d), d->ca_file.s);
if (!d->crl_file.s) {
if (shm_asciiz_dup(&d->crl_file.s, parent->crl_file.s) < 0)
return -1;
d->crl_file.len = parent->crl_file.len;
}
LOG(L_INFO, "%s: crl='%s'\n", tls_domain_str(d), d->crl_file.s);
if (d->require_cert == -1) d->require_cert = parent->require_cert;
LOG(L_INFO, "%s: require_certificate=%d\n", tls_domain_str(d),
d->require_cert);
if (!d->cipher_list.s) {
if ( shm_asciiz_dup(&d->cipher_list.s, parent->cipher_list.s) < 0)
return -1;
d->cipher_list.len = parent->cipher_list.len;
}
LOG(L_INFO, "%s: cipher_list='%s'\n", tls_domain_str(d), d->cipher_list.s);
if (!d->pkey_file.s) {
if (shm_asciiz_dup(&d->pkey_file.s, parent->pkey_file.s) < 0)
return -1;
d->pkey_file.len = parent->pkey_file.len;
}
LOG(L_INFO, "%s: private_key='%s'\n", tls_domain_str(d), d->pkey_file.s);
if (d->verify_cert == -1) d->verify_cert = parent->verify_cert;
LOG(L_INFO, "%s: verify_certificate=%d\n", tls_domain_str(d),
d->verify_cert);
if (d->verify_depth == -1) d->verify_depth = parent->verify_depth;
LOG(L_INFO, "%s: verify_depth=%d\n", tls_domain_str(d), d->verify_depth);
return 0;
}
/**
* @brief Called for ctx, with 2 args
* @param ctx SSL context
* @param larg ?
* @param parg ?
* @return return 0 on succes, <0 on critical error
*/
typedef int (*per_ctx_cbk_f)(SSL_CTX* ctx, long larg, void* parg);
/**
* @brief Execute callback on all the CTX'es on a domain
* @param d domain
* @param ctx_cbk callback function
* @param l1 parameter passed to the callback
* @param p2 parameter passed to the callback
* @return 0 on success, <0 on error
*/
static int tls_domain_foreach_CTX(tls_domain_t* d, per_ctx_cbk_f ctx_cbk,
long l1, void* p2)
{
int i,ret;
int procs_no;
procs_no=get_max_procs();
for(i = 0; i < procs_no; i++) {
if ((ret=ctx_cbk(d->ctx[i], l1, p2))<0)
return ret;
}
return 0;
}
/**
* @brief Execute callback on all the CTX'es on in a domain list
* @param d domain
* @param ctx_cbk callback function
* @param l1 parameter passed to the callback
* @param p2 parameter passed to the callback
* @return 0 on success, <0 on error
*/
static int tls_foreach_CTX_in_domain_lst(tls_domain_t* d,
per_ctx_cbk_f ctx_cbk,
long l1, void* p2)
{
int ret;
for (; d; d=d->next)
if ((ret=tls_domain_foreach_CTX(d, ctx_cbk, l1, p2))<0)
return ret;
return 0;
}
/**
* @brief Execute callback on all the CTX'es in all the srv domains in a tls cfg
* @param cfg tls cfg.
* @param ctx_cbk callback function
* @param l1 parameter passed to the callback
* @param p2 parameter passed to the callback
* @return 0 on success, <0 on error
*/
static int tls_foreach_CTX_in_srv_domains(tls_domains_cfg_t* cfg,
per_ctx_cbk_f ctx_cbk,
long l1, void* p2)
{
int ret;
if ((ret = tls_domain_foreach_CTX(cfg->srv_default, ctx_cbk, l1, p2)) < 0)
return ret;
if ((ret = tls_foreach_CTX_in_domain_lst(cfg->srv_list, ctx_cbk, l1, p2))
< 0)
return ret;
return 0;
}
/**
* @brief Execute callback on all the CTX'es in all the client domains in a tls cfg
* @param cfg tls cfg.
* @param ctx_cbk callback function
* @param l1 parameter passed to the callback
* @param p2 parameter passed to the callback
* @return 0 on success, <0 on error.
*/
static int tls_foreach_CTX_in_cli_domains(tls_domains_cfg_t* cfg,
per_ctx_cbk_f ctx_cbk,
long l1, void* p2)
{
int ret;
if ((ret = tls_domain_foreach_CTX(cfg->cli_default, ctx_cbk, l1, p2)) < 0)
return ret;
if ((ret = tls_foreach_CTX_in_domain_lst(cfg->cli_list, ctx_cbk, l1, p2))
< 0)
return ret;
return 0;
}
/**
* @brief Execute callback on all the CTX'es in all the domains in a tls cfg
* @param cfg tls cfg
* @param ctx_cbk callback function
* @param l1 parameter passed to the callback
* @param p2 parameter passed to the callback
* @return 0 on success, <0 on error
*/
static int tls_foreach_CTX_in_cfg(tls_domains_cfg_t* cfg,
per_ctx_cbk_f ctx_cbk,
long l1, void* p2)
{
int ret;
if ((ret = tls_foreach_CTX_in_srv_domains(cfg, ctx_cbk, l1, p2)) < 0)
return ret;
if ((ret = tls_foreach_CTX_in_cli_domains(cfg, ctx_cbk, l1, p2)) < 0)
return ret;
return 0;
}
/**
* @brief Fix pathnames when loading domain keys or other list
*
* Fix pathnames, to be used when loading the domain key, cert, ca list a.s.o.
* It will replace path with a fixed shm allocated version. Assumes path->s
* was shm allocated.
* @param path path to be fixed. If it starts with '.' or '/' is left alone
* (forced "relative" or "absolute" path). Otherwise the path is considered
* to be relative to the main config file directory
* (e.g. for /etc/ser/ser.cfg => /etc/ser/\<path\>).
* @return 0 on success, -1 on error
*/
int fix_shm_pathname(str* path)
{
str new_path;
char* abs_path;
if (path->s && path->len && *path->s != '.' && *path->s != '/') {
abs_path = get_abs_pathname(0, path);
if (abs_path == 0) return -1;
new_path.len = strlen(abs_path);
new_path.s = shm_malloc(new_path.len + 1);
memcpy(new_path.s, abs_path, new_path.len);
new_path.s[new_path.len] = 0;
shm_free(path->s);
*path = new_path;
}
return 0;
}
/**
* @brief Load certificate from file
* @param d domain
* @return 0 if not configured or on success, -1 on error
*/
static int load_cert(tls_domain_t* d)
{
int i;
int procs_no;
if (!d->cert_file.s || !d->cert_file.len) {
DBG("%s: No certificate configured\n", tls_domain_str(d));
return 0;
}
if (fix_shm_pathname(&d->cert_file) < 0)
return -1;
procs_no=get_max_procs();
for(i = 0; i < procs_no; i++) {
if (!SSL_CTX_use_certificate_chain_file(d->ctx[i], d->cert_file.s)) {
ERR("%s: Unable to load certificate file '%s'\n",
tls_domain_str(d), d->cert_file.s);
TLS_ERR("load_cert:");
return -1;
}
}
return 0;
}
/**
* @brief Load CA list from file
* @param d domain
* @return 0 if not configured or on success, -1 on error
*/
static int load_ca_list(tls_domain_t* d)
{
int i;
int procs_no;
if (!d->ca_file.s || !d->ca_file.len) {
DBG("%s: No CA list configured\n", tls_domain_str(d));
return 0;
}
if (fix_shm_pathname(&d->ca_file) < 0)
return -1;
procs_no=get_max_procs();
for(i = 0; i < procs_no; i++) {
if (SSL_CTX_load_verify_locations(d->ctx[i], d->ca_file.s, 0) != 1) {
ERR("%s: Unable to load CA list '%s'\n", tls_domain_str(d),
d->ca_file.s);
TLS_ERR("load_ca_list:");
return -1;
}
SSL_CTX_set_client_CA_list(d->ctx[i],
SSL_load_client_CA_file(d->ca_file.s));
if (SSL_CTX_get_client_CA_list(d->ctx[i]) == 0) {
ERR("%s: Error while setting client CA list\n", tls_domain_str(d));
TLS_ERR("load_ca_list:");
return -1;
}
}
return 0;
}
/**
* @brief Load CRL from file
* @param d domain
* @return 0 if not configured or on success, -1 on error
*/
static int load_crl(tls_domain_t* d)
{
int i;
int procs_no;
X509_STORE* store;
if (!d->crl_file.s) {
DBG("%s: No CRL configured\n", tls_domain_str(d));
return 0;
}
if (fix_shm_pathname(&d->crl_file) < 0)
return -1;
LOG(L_INFO, "%s: Certificate revocation lists will be checked (%.*s)\n",
tls_domain_str(d), d->crl_file.len, d->crl_file.s);
procs_no=get_max_procs();
for(i = 0; i < procs_no; i++) {
if (SSL_CTX_load_verify_locations(d->ctx[i], d->crl_file.s, 0) != 1) {
ERR("%s: Unable to load certificate revocation list '%s'\n",
tls_domain_str(d), d->crl_file.s);
TLS_ERR("load_crl:");
return -1;
}
store = SSL_CTX_get_cert_store(d->ctx[i]);
X509_STORE_set_flags(store,
X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL);
}
return 0;
}
#define C_DEF_NO_KRB5 "DEFAULT:!KRB5"
#define C_DEF_NO_KRB5_LEN (sizeof(C_DEF_NO_KRB5)-1)
#define C_NO_KRB5_SUFFIX ":!KRB5"
#define C_NO_KRB5_SUFFIX_LEN (sizeof(C_NO_KRB5_SUFFIX)-1)
/**
* @brief Configure cipher list
* @param d domain
* @return 0 on success, -1 on error
*/
static int set_cipher_list(tls_domain_t* d)
{
int i;
int procs_no;
char* cipher_list;
cipher_list=d->cipher_list.s;
#ifdef TLS_KSSL_WORKARROUND
if (openssl_kssl_malloc_bug) { /* is openssl bug #1467 present ? */
if (d->cipher_list.s==0) {
/* use "DEFAULT:!KRB5" */
cipher_list="DEFAULT:!KRB5";
} else {
/* append ":!KRB5" */
cipher_list=shm_malloc(d->cipher_list.len+C_NO_KRB5_SUFFIX_LEN+1);
if (cipher_list) {
memcpy(cipher_list, d->cipher_list.s, d->cipher_list.len);
memcpy(cipher_list+d->cipher_list.len, C_NO_KRB5_SUFFIX,
C_NO_KRB5_SUFFIX_LEN);
cipher_list[d->cipher_list.len+C_NO_KRB5_SUFFIX_LEN]=0;
shm_free(d->cipher_list.s);
d->cipher_list.s=cipher_list;
d->cipher_list.len+=C_NO_KRB5_SUFFIX_LEN;
}
}
}
#endif /* TLS_KSSL_WORKARROUND */
if (!cipher_list) return 0;
procs_no=get_max_procs();
for(i = 0; i < procs_no; i++) {
if (SSL_CTX_set_cipher_list(d->ctx[i], cipher_list) == 0 ) {
ERR("%s: Failure to set SSL context cipher list \"%s\"\n",
tls_domain_str(d), cipher_list);
return -1;
}
}
return 0;
}
/**
* @brief Enable/disable TLS certificate verification
* @param d domain
* @return 0
*/
static int set_verification(tls_domain_t* d)
{
int verify_mode, i;
int procs_no;
if (d->require_cert) {
verify_mode = SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
LOG(L_INFO, "%s: %s MUST present valid certificate\n",
tls_domain_str(d), d->type & TLS_DOMAIN_SRV ? "Client" : "Server");
} else {
if (d->verify_cert) {
verify_mode = SSL_VERIFY_PEER;
if (d->type & TLS_DOMAIN_SRV) {
LOG(L_INFO, "%s: IF client provides certificate then it"
" MUST be valid\n", tls_domain_str(d));
} else {
LOG(L_INFO, "%s: Server MUST present valid certificate\n",
tls_domain_str(d));
}
} else {
verify_mode = SSL_VERIFY_NONE;
if (d->type & TLS_DOMAIN_SRV) {
LOG(L_INFO, "%s: No client certificate required and no checks"
" performed\n", tls_domain_str(d));
} else {
LOG(L_INFO, "%s: Server MAY present invalid certificate\n",
tls_domain_str(d));
}
}
}
procs_no=get_max_procs();
for(i = 0; i < procs_no; i++) {
SSL_CTX_set_verify(d->ctx[i], verify_mode, 0);
SSL_CTX_set_verify_depth(d->ctx[i], d->verify_depth);
}
return 0;
}
/* This callback function is executed when libssl processes the SSL
* handshake and does SSL record layer stuff. It's used to trap
* client-initiated renegotiations.
*/
static void sr_ssl_ctx_info_callback(const SSL *ssl, int event, int ret)
{
struct tls_extra_data* data = 0;
int tls_dbg;
if (event & SSL_CB_HANDSHAKE_START) {
tls_dbg = cfg_get(tls, tls_cfg, debug);
LOG(tls_dbg, "SSL handshake started\n");
if(data==0)
data = (struct tls_extra_data*)SSL_get_app_data(ssl);
if(data->flags & F_TLS_CON_HANDSHAKED) {
LOG(tls_dbg, "SSL renegotiation initiated by client\n");
data->flags |= F_TLS_CON_RENEGOTIATION;
}
}
if (event & SSL_CB_HANDSHAKE_DONE) {
tls_dbg = cfg_get(tls, tls_cfg, debug);
if(data==0)
data = (struct tls_extra_data*)SSL_get_app_data(ssl);
LOG(tls_dbg, "SSL handshake done\n");
/* CVE-2009-3555 - disable renegotiation */
if (ssl->s3) {
LOG(tls_dbg, "SSL disable renegotiation\n");
ssl->s3->flags |= SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS;
}
data->flags |= F_TLS_CON_HANDSHAKED;
}
}
/**
* @brief Configure generic SSL parameters
* @param d domain
* @return 0
*/
static int set_ssl_options(tls_domain_t* d)
{
int i;
int procs_no;
long options;
#if OPENSSL_VERSION_NUMBER >= 0x00908000L
long ssl_version;
STACK_OF(SSL_COMP)* comp_methods;
#endif
procs_no=get_max_procs();
options=SSL_OP_ALL; /* all the bug workarrounds by default */
#if OPENSSL_VERSION_NUMBER >= 0x00907000L
options|=SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION |
SSL_OP_CIPHER_SERVER_PREFERENCE;
#if OPENSSL_VERSION_NUMBER >= 0x00908000L
ssl_version=SSLeay();
if ((ssl_version >= 0x0090800L) && (ssl_version < 0x0090803fL)){
/* if 0.9.8 <= openssl version < 0.9.8c and compression support is
* enabled disable SSL_OP_TLS_BLOCK_PADDING_BUG (set by SSL_OP_ALL),
* see openssl #1204 http://rt.openssl.org/Ticket/Display.html?id=1204
*/
comp_methods=SSL_COMP_get_compression_methods();
if (comp_methods && (sk_SSL_COMP_num(comp_methods) > 0)){
options &= ~SSL_OP_TLS_BLOCK_PADDING_BUG;
LOG(L_WARN, "tls: set_ssl_options: openssl "
"SSL_OP_TLS_BLOCK_PADDING bug workaround enabled "
"(openssl version %lx)\n", ssl_version);
}else{
LOG(L_INFO, "tls: set_ssl_options: detected openssl version (%lx) "
" has the SSL_OP_TLS_BLOCK_PADDING bug, but compression "
" is disabled so no workaround is needed\n", ssl_version);
}
}
# endif
#endif
for(i = 0; i < procs_no; i++) {
SSL_CTX_set_options(d->ctx[i], options);
if(sr_tls_renegotiation==0)
SSL_CTX_set_info_callback(d->ctx[i], sr_ssl_ctx_info_callback);
}
return 0;
}
/**
* @brief Configure TLS session cache parameters
* @param d domain
* @return 0
*/
static int set_session_cache(tls_domain_t* d)
{
int i;
int procs_no;
str tls_session_id;
procs_no=get_max_procs();
tls_session_id=cfg_get(tls, tls_cfg, session_id);
for(i = 0; i < procs_no; i++) {
/* janakj: I am not sure if session cache makes sense in ser, session
* cache is stored in SSL_CTX and we have one SSL_CTX per process,
* thus sessions among processes will not be reused
*/
SSL_CTX_set_session_cache_mode(d->ctx[i],
cfg_get(tls, tls_cfg, session_cache) ? SSL_SESS_CACHE_SERVER :
SSL_SESS_CACHE_OFF);
/* not really needed is SSL_SESS_CACHE_OFF */
SSL_CTX_set_session_id_context(d->ctx[i],
(unsigned char*)tls_session_id.s, tls_session_id.len);
}
return 0;
}
/**
* @brief TLS SSL_CTX_set_mode and SSL_CTX_clear_mode wrapper
* @param ctx SSL context
* @param mode SSL_MODE_*
* @param clear if set to !=0 will do a clear, else (==0) a set
* @return 0 (always succeeds)
*/
static int tls_ssl_ctx_mode(SSL_CTX* ctx, long mode, void* clear)
{
if (clear)
#if OPENSSL_VERSION_NUMBER >= 0x01000000L || \
defined SSL_CTX_clear_mode
SSL_CTX_clear_mode(ctx, mode);
#else
return -1;
#endif
else
SSL_CTX_set_mode(ctx, mode);
return 0;
}
/**
* @brief TLS set ctx->free_list_max_len
* @param ctx TLS context
* @param val value (<0 ignored)
* @param unused unused
* @return 0 (always succeeds)
*/
static int tls_ssl_ctx_set_freelist(SSL_CTX* ctx, long val, void* unused)
{
if (val >= 0)
#if OPENSSL_VERSION_NUMBER >= 0x01000000L
#ifndef OPENSSL_NO_BUF_FREELISTS
ctx->freelist_max_len = val;
#endif
#endif
#if defined (OPENSSL_NO_BUF_FREELISTS) || OPENSSL_VERSION_NUMBER < 0x01000000L
return -1;
#endif
return 0;
}
/**
* @brief TLS SSL_CTX_set_max_send_fragment wrapper
* @param ctx TLS context
* @param val value (<0 ignored). Should be between 512 and 16k
* @param unused unused
* @return 0 on success, < 0 on failure (invalid value)
*/
static int tls_ssl_ctx_set_max_send_fragment(SSL_CTX* ctx, long val, void* unused)
{
if (val >= 0)
#if OPENSSL_VERSION_NUMBER >= 0x00909000L
return SSL_CTX_set_max_send_fragment(ctx, val) -1;
#else
return -1;
#endif
return 0;
}
/**
* @brief TLS SSL_CTX_set_read_ahead wrapper
* @param ctx TLS context
* @param val value (<0 ignored, 0 or >0)
* @param unused unused
* @return 0 (always success).
*/
static int tls_ssl_ctx_set_read_ahead(SSL_CTX* ctx, long val, void* unused)
{
if (val >= 0)
SSL_CTX_set_read_ahead(ctx, val);
return 0;
}
/**
* @brief Initialize all domain attributes from default domains if necessary
* @param d initialized TLS domain
* @param def default TLS domains
*/
static int fix_domain(tls_domain_t* d, tls_domain_t* def)
{
int i;
int procs_no;
if (fill_missing(d, def) < 0) return -1;
procs_no=get_max_procs();
d->ctx = (SSL_CTX**)shm_malloc(sizeof(SSL_CTX*) * procs_no);
if (!d->ctx) {
ERR("%s: Cannot allocate shared memory\n", tls_domain_str(d));
return -1;
}
memset(d->ctx, 0, sizeof(SSL_CTX*) * procs_no);
for(i = 0; i < procs_no; i++) {
d->ctx[i] = SSL_CTX_new((SSL_METHOD*)ssl_methods[d->method - 1]);
if (d->ctx[i] == NULL) {
ERR("%s: Cannot create SSL context\n", tls_domain_str(d));
return -1;
}
}
if (load_cert(d) < 0) return -1;
if (load_ca_list(d) < 0) return -1;
if (load_crl(d) < 0) return -1;
if (set_cipher_list(d) < 0) return -1;
if (set_verification(d) < 0) return -1;
if (set_ssl_options(d) < 0) return -1;
if (set_session_cache(d) < 0) return -1;
return 0;
}
/**
* @brief Password callback, ask for private key password on CLI
* @param buf buffer
* @param size buffer size
* @param rwflag not used
* @param filename filename
* @return length of password on success, 0 on error
*/
static int passwd_cb(char *buf, int size, int rwflag, void *filename)
{
#if OPENSSL_VERSION_NUMBER >= 0x00907000L
UI *ui;
const char *prompt;
ui = UI_new();
if (ui == NULL)
goto err;
prompt = UI_construct_prompt(ui, "passphrase", filename);
UI_add_input_string(ui, prompt, 0, buf, 0, size - 1);
UI_process(ui);
UI_free(ui);
return strlen(buf);
err:
ERR("passwd_cb: Error in passwd_cb\n");
if (ui) {
UI_free(ui);
}
return 0;
#else
if (des_read_pw_string(buf, size-1, "Enter Private Key password:", 0)) {
ERR("Error in passwd_cb\n");
return 0;
}
return strlen(buf);
#endif
}
/**
* @brief Load a private key from a file
* @param d TLS domain
* @return 0 on success, -1 on error
*/
static int load_private_key(tls_domain_t* d)
{
int idx, ret_pwd, i;
int procs_no;
if (!d->pkey_file.s || !d->pkey_file.len) {
DBG("%s: No private key specified\n", tls_domain_str(d));
return 0;
}
if (fix_shm_pathname(&d->pkey_file) < 0)
return -1;
procs_no=get_max_procs();
for(i = 0; i < procs_no; i++) {
SSL_CTX_set_default_passwd_cb(d->ctx[i], passwd_cb);
SSL_CTX_set_default_passwd_cb_userdata(d->ctx[i], d->pkey_file.s);
for(idx = 0, ret_pwd = 0; idx < 3; idx++) {
ret_pwd = SSL_CTX_use_PrivateKey_file(d->ctx[i], d->pkey_file.s,
SSL_FILETYPE_PEM);
if (ret_pwd) {
break;
} else {
ERR("%s: Unable to load private key '%s'\n",
tls_domain_str(d), d->pkey_file.s);
TLS_ERR("load_private_key:");
continue;
}
}
if (!ret_pwd) {
ERR("%s: Unable to load private key file '%s'\n",
tls_domain_str(d), d->pkey_file.s);
TLS_ERR("load_private_key:");
return -1;
}
if (!SSL_CTX_check_private_key(d->ctx[i])) {
ERR("%s: Key '%s' does not match the public key of the"
" certificate\n", tls_domain_str(d), d->pkey_file.s);
TLS_ERR("load_private_key:");
return -1;
}
}
DBG("%s: Key '%s' successfuly loaded\n",
tls_domain_str(d), d->pkey_file.s);
return 0;
}
/**
* @brief Initialize attributes of all domains from default domains if necessary
*
* Initialize attributes of all domains from default domains if necessary,
* fill in missing parameters.
* @param cfg initialized domain
* @param srv_defaults server defaults
* @param cli_defaults command line interface defaults
* @return 0 on success, -1 on error
*/
int tls_fix_domains_cfg(tls_domains_cfg_t* cfg, tls_domain_t* srv_defaults,
tls_domain_t* cli_defaults)
{
tls_domain_t* d;
int ssl_mode_release_buffers;
int ssl_freelist_max_len;
int ssl_max_send_fragment;
int ssl_read_ahead;
if (!cfg->cli_default) {
cfg->cli_default = tls_new_domain(TLS_DOMAIN_DEF | TLS_DOMAIN_CLI,
0, 0);
}
if (!cfg->srv_default) {
cfg->srv_default = tls_new_domain(TLS_DOMAIN_DEF | TLS_DOMAIN_SRV,
0, 0);
}
if (fix_domain(cfg->srv_default, srv_defaults) < 0) return -1;
if (fix_domain(cfg->cli_default, cli_defaults) < 0) return -1;
d = cfg->srv_list;
while (d) {
if (fix_domain(d, srv_defaults) < 0) return -1;
d = d->next;
}
d = cfg->cli_list;
while (d) {
if (fix_domain(d, cli_defaults) < 0) return -1;
d = d->next;
}
/* Ask for passwords as the last step */
d = cfg->srv_list;
while(d) {
if (load_private_key(d) < 0) return -1;
d = d->next;
}
d = cfg->cli_list;
while(d) {
if (load_private_key(d) < 0) return -1;
d = d->next;
}
if (load_private_key(cfg->srv_default) < 0) return -1;
if (load_private_key(cfg->cli_default) < 0) return -1;
/* set various global per CTX options
* (done here to show possible missing features messages only once)
*/
ssl_mode_release_buffers = cfg_get(tls, tls_cfg, ssl_release_buffers);
ssl_freelist_max_len = cfg_get(tls, tls_cfg, ssl_freelist_max);
ssl_max_send_fragment = cfg_get(tls, tls_cfg, ssl_max_send_fragment);
ssl_read_ahead = cfg_get(tls, tls_cfg, ssl_read_ahead);
#if OPENSSL_VERSION_NUMBER >= 0x01000000L
/* set SSL_MODE_RELEASE_BUFFERS if ssl_mode_release_buffers !=0,
reset if == 0 and ignore if < 0 */
/* only in >= 1.0.0 */
if (ssl_mode_release_buffers >= 0 &&
tls_foreach_CTX_in_cfg(cfg, tls_ssl_ctx_mode, SSL_MODE_RELEASE_BUFFERS,
(void*)(long)(ssl_mode_release_buffers==0))
< 0) {
ERR("invalid ssl_release_buffers value (%d)\n",
ssl_mode_release_buffers);
return -1;
}
#else
if (ssl_mode_release_buffers > 0)
ERR("cannot change openssl mode_release_buffers, the openssl version"
" is too old (need at least 1.0.0)\n");
#endif
/* only in >= 1.0.0 */
#if OPENSSL_VERSION_NUMBER >= 0x01000000L
#ifndef OPENSSL_NO_BUF_FREELISTS
if (tls_foreach_CTX_in_cfg(cfg, tls_ssl_ctx_set_freelist,
ssl_freelist_max_len, 0) < 0) {
ERR("invalid ssl_freelist_max_len value (%d)\n",
ssl_freelist_max_len);
return -1;
}
#endif
#endif
#if defined (OPENSSL_NO_BUF_FREELISTS) || OPENSSL_VERSION_NUMBER < 0x01000000L
if (ssl_freelist_max_len >= 0)
ERR("cannot change openssl freelist_max_len, openssl too old"
"(needed at least 1.0.0) or compiled without freelist support"
" (OPENSSL_NO_BUF_FREELIST)\n");
#endif
#if OPENSSL_VERSION_NUMBER >= 0x00909000L
/* only in >= 0.9.9 */
if (tls_foreach_CTX_in_cfg(cfg, tls_ssl_ctx_set_max_send_fragment,
ssl_max_send_fragment, 0) < 0) {
ERR("invalid ssl_max_send_fragment value (%d)\n",
ssl_max_send_fragment);
return -1;
}
#else
if (ssl_max_send_fragment > 0)
ERR("cannot change openssl max_send_fragment, the openssl version"
" is too old (need at least 0.9.9)\n");
#endif
if (tls_foreach_CTX_in_cfg(cfg, tls_ssl_ctx_set_read_ahead,
ssl_read_ahead, 0) < 0) {
ERR("invalid ssl_read_ahead value (%d)\n", ssl_read_ahead);
return -1;
}
/* set options for SSL_write:
SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER - needed when queueing
clear text for a future write (WANTS_READ). In this case the
buffer address will change for the repeated SSL_write() and
without this option it will trigger the openssl sanity checks.
SSL_MODE_ENABLE_PARTIAL_WRITE - needed to deal with potentially
huge multi-record writes that don't fit in the default buffer
(the default buffer must have space for at least 1 record) */
if (tls_foreach_CTX_in_cfg(cfg, tls_ssl_ctx_mode,
SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER |
SSL_MODE_ENABLE_PARTIAL_WRITE,
0) < 0) {
ERR("could not set SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER and"
" SSL_MODE_ENABLE_PARTIAL_WRITE\n");
return -1;
}
return 0;
}
/**
* @brief Create new configuration structure
*
* Create new configuration structure in new allocated shared memory
* @return configuration structure or zero on error
*/
tls_domains_cfg_t* tls_new_cfg(void)
{
tls_domains_cfg_t* r;
r = (tls_domains_cfg_t*)shm_malloc(sizeof(tls_domains_cfg_t));
if (!r) {
ERR("No memory left\n");
return 0;
}
memset(r, 0, sizeof(tls_domains_cfg_t));
return r;
}
/**
* @brief Lookup TLS configuration based on type, ip, and port
* @param cfg configuration set
* @param type type of configuration
* @param ip IP for configuration
* @param port port for configuration
* @return found configuration or default, if not found
*/
tls_domain_t* tls_lookup_cfg(tls_domains_cfg_t* cfg, int type,
struct ip_addr* ip, unsigned short port)
{
tls_domain_t *p;
if (type & TLS_DOMAIN_DEF) {
if (type & TLS_DOMAIN_SRV) return cfg->srv_default;
else return cfg->cli_default;
} else {
if (type & TLS_DOMAIN_SRV) p = cfg->srv_list;
else p = cfg->cli_list;
}
while (p) {
if ((p->port == port) && ip_addr_cmp(&p->ip, ip))
return p;
p = p->next;
}
/* No matching domain found, return default */
if (type & TLS_DOMAIN_SRV) return cfg->srv_default;
else return cfg->cli_default;
}
/**
* @brief Check whether configuration domain exists
* @param cfg configuration set
* @param d checked domain
* @return 1 if domain exists, 0 if its not exists
*/
static int domain_exists(tls_domains_cfg_t* cfg, tls_domain_t* d)
{
tls_domain_t *p;
if (d->type & TLS_DOMAIN_DEF) {
if (d->type & TLS_DOMAIN_SRV) return cfg->srv_default != NULL;
else return cfg->cli_default != NULL;
} else {
if (d->type & TLS_DOMAIN_SRV) p = cfg->srv_list;
else p = cfg->cli_list;
}
while (p) {
if ((p->port == d->port) && ip_addr_cmp(&p->ip, &d->ip))
return 1;
p = p->next;
}
return 0;
}
/**
* @brief Add a domain to the configuration set
* @param cfg configuration set
* @param d TLS domain
* @return 1 if domain already exists, 0 after addition, -1 on error
*/
int tls_add_domain(tls_domains_cfg_t* cfg, tls_domain_t* d)
{
if (!cfg) {
ERR("TLS configuration structure missing\n");
return -1;
}
/* Make sure the domain does not exist */
if (domain_exists(cfg, d)) return 1;
if (d->type & TLS_DOMAIN_DEF) {
if (d->type & TLS_DOMAIN_CLI) {
cfg->cli_default = d;
} else {
cfg->srv_default = d;
}
} else {
if (d->type & TLS_DOMAIN_SRV) {
d->next = cfg->srv_list;
cfg->srv_list = d;
} else {
d->next = cfg->cli_list;
cfg->cli_list = d;
}
}
return 0;
}
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