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0eefd3079a
freebsd-skq/contrib/unbound/util/net_help.c
Cy Schubert 0eefd3079a MFV r356143: 
Update unbound 1.9.2 --> 1.9.6.

MFC after:	3 days
Security:	CVE-2019-18934 (fixed by 1.9.5)
2019-12-31 15:50:41 +00:00

1293 lines
34 KiB
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/*
* util/net_help.c - implementation of the network helper code
*
* Copyright (c) 2007, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
* Implementation of net_help.h.
*/
#include "config.h"
#include "util/net_help.h"
#include "util/log.h"
#include "util/data/dname.h"
#include "util/module.h"
#include "util/regional.h"
#include "util/config_file.h"
#include "sldns/parseutil.h"
#include "sldns/wire2str.h"
#include <fcntl.h>
#ifdef HAVE_OPENSSL_SSL_H
#include <openssl/ssl.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#endif
#ifdef HAVE_OPENSSL_ERR_H
#include <openssl/err.h>
#endif
#ifdef USE_WINSOCK
#include <wincrypt.h>
#endif
/** max length of an IP address (the address portion) that we allow */
#define MAX_ADDR_STRLEN 128 /* characters */
/** default value for EDNS ADVERTISED size */
uint16_t EDNS_ADVERTISED_SIZE = 4096;
/** minimal responses when positive answer: default is no */
int MINIMAL_RESPONSES = 0;
/** rrset order roundrobin: default is no */
int RRSET_ROUNDROBIN = 0;
/** log tag queries with name instead of 'info' for filtering */
int LOG_TAG_QUERYREPLY = 0;
static struct tls_session_ticket_key {
unsigned char *key_name;
unsigned char *aes_key;
unsigned char *hmac_key;
} *ticket_keys;
/* returns true is string addr is an ip6 specced address */
int
str_is_ip6(const char* str)
{
if(strchr(str, ':'))
return 1;
else return 0;
}
int
fd_set_nonblock(int s)
{
#ifdef HAVE_FCNTL
int flag;
if((flag = fcntl(s, F_GETFL)) == -1) {
log_err("can't fcntl F_GETFL: %s", strerror(errno));
flag = 0;
}
flag |= O_NONBLOCK;
if(fcntl(s, F_SETFL, flag) == -1) {
log_err("can't fcntl F_SETFL: %s", strerror(errno));
return 0;
}
#elif defined(HAVE_IOCTLSOCKET)
unsigned long on = 1;
if(ioctlsocket(s, FIONBIO, &on) != 0) {
log_err("can't ioctlsocket FIONBIO on: %s",
wsa_strerror(WSAGetLastError()));
}
#endif
return 1;
}
int
fd_set_block(int s)
{
#ifdef HAVE_FCNTL
int flag;
if((flag = fcntl(s, F_GETFL)) == -1) {
log_err("cannot fcntl F_GETFL: %s", strerror(errno));
flag = 0;
}
flag &= ~O_NONBLOCK;
if(fcntl(s, F_SETFL, flag) == -1) {
log_err("cannot fcntl F_SETFL: %s", strerror(errno));
return 0;
}
#elif defined(HAVE_IOCTLSOCKET)
unsigned long off = 0;
if(ioctlsocket(s, FIONBIO, &off) != 0) {
if(WSAGetLastError() != WSAEINVAL || verbosity >= 4)
log_err("can't ioctlsocket FIONBIO off: %s",
wsa_strerror(WSAGetLastError()));
}
#endif
return 1;
}
int
is_pow2(size_t num)
{
if(num == 0) return 1;
return (num & (num-1)) == 0;
}
void*
memdup(void* data, size_t len)
{
void* d;
if(!data) return NULL;
if(len == 0) return NULL;
d = malloc(len);
if(!d) return NULL;
memcpy(d, data, len);
return d;
}
void
log_addr(enum verbosity_value v, const char* str,
struct sockaddr_storage* addr, socklen_t addrlen)
{
uint16_t port;
const char* family = "unknown";
char dest[100];
int af = (int)((struct sockaddr_in*)addr)->sin_family;
void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
if(verbosity < v)
return;
switch(af) {
case AF_INET: family="ip4"; break;
case AF_INET6: family="ip6";
sinaddr = &((struct sockaddr_in6*)addr)->sin6_addr;
break;
case AF_LOCAL:
dest[0]=0;
(void)inet_ntop(af, sinaddr, dest,
(socklen_t)sizeof(dest));
verbose(v, "%s local %s", str, dest);
return; /* do not continue and try to get port */
default: break;
}
if(inet_ntop(af, sinaddr, dest, (socklen_t)sizeof(dest)) == 0) {
(void)strlcpy(dest, "(inet_ntop error)", sizeof(dest));
}
dest[sizeof(dest)-1] = 0;
port = ntohs(((struct sockaddr_in*)addr)->sin_port);
if(verbosity >= 4)
verbose(v, "%s %s %s port %d (len %d)", str, family, dest,
(int)port, (int)addrlen);
else verbose(v, "%s %s port %d", str, dest, (int)port);
}
int
extstrtoaddr(const char* str, struct sockaddr_storage* addr,
socklen_t* addrlen)
{
char* s;
int port = UNBOUND_DNS_PORT;
if((s=strchr(str, '@'))) {
char buf[MAX_ADDR_STRLEN];
if(s-str >= MAX_ADDR_STRLEN) {
return 0;
}
(void)strlcpy(buf, str, sizeof(buf));
buf[s-str] = 0;
port = atoi(s+1);
if(port == 0 && strcmp(s+1,"0")!=0) {
return 0;
}
return ipstrtoaddr(buf, port, addr, addrlen);
}
return ipstrtoaddr(str, port, addr, addrlen);
}
int
ipstrtoaddr(const char* ip, int port, struct sockaddr_storage* addr,
socklen_t* addrlen)
{
uint16_t p;
if(!ip) return 0;
p = (uint16_t) port;
if(str_is_ip6(ip)) {
char buf[MAX_ADDR_STRLEN];
char* s;
struct sockaddr_in6* sa = (struct sockaddr_in6*)addr;
*addrlen = (socklen_t)sizeof(struct sockaddr_in6);
memset(sa, 0, *addrlen);
sa->sin6_family = AF_INET6;
sa->sin6_port = (in_port_t)htons(p);
if((s=strchr(ip, '%'))) { /* ip6%interface, rfc 4007 */
if(s-ip >= MAX_ADDR_STRLEN)
return 0;
(void)strlcpy(buf, ip, sizeof(buf));
buf[s-ip]=0;
sa->sin6_scope_id = (uint32_t)atoi(s+1);
ip = buf;
}
if(inet_pton((int)sa->sin6_family, ip, &sa->sin6_addr) <= 0) {
return 0;
}
} else { /* ip4 */
struct sockaddr_in* sa = (struct sockaddr_in*)addr;
*addrlen = (socklen_t)sizeof(struct sockaddr_in);
memset(sa, 0, *addrlen);
sa->sin_family = AF_INET;
sa->sin_port = (in_port_t)htons(p);
if(inet_pton((int)sa->sin_family, ip, &sa->sin_addr) <= 0) {
return 0;
}
}
return 1;
}
int netblockstrtoaddr(const char* str, int port, struct sockaddr_storage* addr,
socklen_t* addrlen, int* net)
{
char buf[64];
char* s;
*net = (str_is_ip6(str)?128:32);
if((s=strchr(str, '/'))) {
if(atoi(s+1) > *net) {
log_err("netblock too large: %s", str);
return 0;
}
*net = atoi(s+1);
if(*net == 0 && strcmp(s+1, "0") != 0) {
log_err("cannot parse netblock: '%s'", str);
return 0;
}
strlcpy(buf, str, sizeof(buf));
s = strchr(buf, '/');
if(s) *s = 0;
s = buf;
}
if(!ipstrtoaddr(s?s:str, port, addr, addrlen)) {
log_err("cannot parse ip address: '%s'", str);
return 0;
}
if(s) {
addr_mask(addr, *addrlen, *net);
}
return 1;
}
int authextstrtoaddr(char* str, struct sockaddr_storage* addr,
socklen_t* addrlen, char** auth_name)
{
char* s;
int port = UNBOUND_DNS_PORT;
if((s=strchr(str, '@'))) {
char buf[MAX_ADDR_STRLEN];
size_t len = (size_t)(s-str);
char* hash = strchr(s+1, '#');
if(hash) {
*auth_name = hash+1;
} else {
*auth_name = NULL;
}
if(len >= MAX_ADDR_STRLEN) {
return 0;
}
(void)strlcpy(buf, str, sizeof(buf));
buf[len] = 0;
port = atoi(s+1);
if(port == 0) {
if(!hash && strcmp(s+1,"0")!=0)
return 0;
if(hash && strncmp(s+1,"0#",2)!=0)
return 0;
}
return ipstrtoaddr(buf, port, addr, addrlen);
}
if((s=strchr(str, '#'))) {
char buf[MAX_ADDR_STRLEN];
size_t len = (size_t)(s-str);
if(len >= MAX_ADDR_STRLEN) {
return 0;
}
(void)strlcpy(buf, str, sizeof(buf));
buf[len] = 0;
port = UNBOUND_DNS_OVER_TLS_PORT;
*auth_name = s+1;
return ipstrtoaddr(buf, port, addr, addrlen);
}
*auth_name = NULL;
return ipstrtoaddr(str, port, addr, addrlen);
}
/** store port number into sockaddr structure */
void
sockaddr_store_port(struct sockaddr_storage* addr, socklen_t addrlen, int port)
{
if(addr_is_ip6(addr, addrlen)) {
struct sockaddr_in6* sa = (struct sockaddr_in6*)addr;
sa->sin6_port = (in_port_t)htons((uint16_t)port);
} else {
struct sockaddr_in* sa = (struct sockaddr_in*)addr;
sa->sin_port = (in_port_t)htons((uint16_t)port);
}
}
void
log_nametypeclass(enum verbosity_value v, const char* str, uint8_t* name,
uint16_t type, uint16_t dclass)
{
char buf[LDNS_MAX_DOMAINLEN+1];
char t[12], c[12];
const char *ts, *cs;
if(verbosity < v)
return;
dname_str(name, buf);
if(type == LDNS_RR_TYPE_TSIG) ts = "TSIG";
else if(type == LDNS_RR_TYPE_IXFR) ts = "IXFR";
else if(type == LDNS_RR_TYPE_AXFR) ts = "AXFR";
else if(type == LDNS_RR_TYPE_MAILB) ts = "MAILB";
else if(type == LDNS_RR_TYPE_MAILA) ts = "MAILA";
else if(type == LDNS_RR_TYPE_ANY) ts = "ANY";
else if(sldns_rr_descript(type) && sldns_rr_descript(type)->_name)
ts = sldns_rr_descript(type)->_name;
else {
snprintf(t, sizeof(t), "TYPE%d", (int)type);
ts = t;
}
if(sldns_lookup_by_id(sldns_rr_classes, (int)dclass) &&
sldns_lookup_by_id(sldns_rr_classes, (int)dclass)->name)
cs = sldns_lookup_by_id(sldns_rr_classes, (int)dclass)->name;
else {
snprintf(c, sizeof(c), "CLASS%d", (int)dclass);
cs = c;
}
log_info("%s %s %s %s", str, buf, ts, cs);
}
void
log_query_in(const char* str, uint8_t* name, uint16_t type, uint16_t dclass)
{
char buf[LDNS_MAX_DOMAINLEN+1];
char t[12], c[12];
const char *ts, *cs;
dname_str(name, buf);
if(type == LDNS_RR_TYPE_TSIG) ts = "TSIG";
else if(type == LDNS_RR_TYPE_IXFR) ts = "IXFR";
else if(type == LDNS_RR_TYPE_AXFR) ts = "AXFR";
else if(type == LDNS_RR_TYPE_MAILB) ts = "MAILB";
else if(type == LDNS_RR_TYPE_MAILA) ts = "MAILA";
else if(type == LDNS_RR_TYPE_ANY) ts = "ANY";
else if(sldns_rr_descript(type) && sldns_rr_descript(type)->_name)
ts = sldns_rr_descript(type)->_name;
else {
snprintf(t, sizeof(t), "TYPE%d", (int)type);
ts = t;
}
if(sldns_lookup_by_id(sldns_rr_classes, (int)dclass) &&
sldns_lookup_by_id(sldns_rr_classes, (int)dclass)->name)
cs = sldns_lookup_by_id(sldns_rr_classes, (int)dclass)->name;
else {
snprintf(c, sizeof(c), "CLASS%d", (int)dclass);
cs = c;
}
if(LOG_TAG_QUERYREPLY)
log_query("%s %s %s %s", str, buf, ts, cs);
else log_info("%s %s %s %s", str, buf, ts, cs);
}
void log_name_addr(enum verbosity_value v, const char* str, uint8_t* zone,
struct sockaddr_storage* addr, socklen_t addrlen)
{
uint16_t port;
const char* family = "unknown_family ";
char namebuf[LDNS_MAX_DOMAINLEN+1];
char dest[100];
int af = (int)((struct sockaddr_in*)addr)->sin_family;
void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
if(verbosity < v)
return;
switch(af) {
case AF_INET: family=""; break;
case AF_INET6: family="";
sinaddr = &((struct sockaddr_in6*)addr)->sin6_addr;
break;
case AF_LOCAL: family="local "; break;
default: break;
}
if(inet_ntop(af, sinaddr, dest, (socklen_t)sizeof(dest)) == 0) {
(void)strlcpy(dest, "(inet_ntop error)", sizeof(dest));
}
dest[sizeof(dest)-1] = 0;
port = ntohs(((struct sockaddr_in*)addr)->sin_port);
dname_str(zone, namebuf);
if(af != AF_INET && af != AF_INET6)
verbose(v, "%s <%s> %s%s#%d (addrlen %d)",
str, namebuf, family, dest, (int)port, (int)addrlen);
else verbose(v, "%s <%s> %s%s#%d",
str, namebuf, family, dest, (int)port);
}
void log_err_addr(const char* str, const char* err,
struct sockaddr_storage* addr, socklen_t addrlen)
{
uint16_t port;
char dest[100];
int af = (int)((struct sockaddr_in*)addr)->sin_family;
void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
if(af == AF_INET6)
sinaddr = &((struct sockaddr_in6*)addr)->sin6_addr;
if(inet_ntop(af, sinaddr, dest, (socklen_t)sizeof(dest)) == 0) {
(void)strlcpy(dest, "(inet_ntop error)", sizeof(dest));
}
dest[sizeof(dest)-1] = 0;
port = ntohs(((struct sockaddr_in*)addr)->sin_port);
if(verbosity >= 4)
log_err("%s: %s for %s port %d (len %d)", str, err, dest,
(int)port, (int)addrlen);
else log_err("%s: %s for %s port %d", str, err, dest, (int)port);
}
int
sockaddr_cmp(struct sockaddr_storage* addr1, socklen_t len1,
struct sockaddr_storage* addr2, socklen_t len2)
{
struct sockaddr_in* p1_in = (struct sockaddr_in*)addr1;
struct sockaddr_in* p2_in = (struct sockaddr_in*)addr2;
struct sockaddr_in6* p1_in6 = (struct sockaddr_in6*)addr1;
struct sockaddr_in6* p2_in6 = (struct sockaddr_in6*)addr2;
if(len1 < len2)
return -1;
if(len1 > len2)
return 1;
log_assert(len1 == len2);
if( p1_in->sin_family < p2_in->sin_family)
return -1;
if( p1_in->sin_family > p2_in->sin_family)
return 1;
log_assert( p1_in->sin_family == p2_in->sin_family );
/* compare ip4 */
if( p1_in->sin_family == AF_INET ) {
/* just order it, ntohs not required */
if(p1_in->sin_port < p2_in->sin_port)
return -1;
if(p1_in->sin_port > p2_in->sin_port)
return 1;
log_assert(p1_in->sin_port == p2_in->sin_port);
return memcmp(&p1_in->sin_addr, &p2_in->sin_addr, INET_SIZE);
} else if (p1_in6->sin6_family == AF_INET6) {
/* just order it, ntohs not required */
if(p1_in6->sin6_port < p2_in6->sin6_port)
return -1;
if(p1_in6->sin6_port > p2_in6->sin6_port)
return 1;
log_assert(p1_in6->sin6_port == p2_in6->sin6_port);
return memcmp(&p1_in6->sin6_addr, &p2_in6->sin6_addr,
INET6_SIZE);
} else {
/* eek unknown type, perform this comparison for sanity. */
return memcmp(addr1, addr2, len1);
}
}
int
sockaddr_cmp_addr(struct sockaddr_storage* addr1, socklen_t len1,
struct sockaddr_storage* addr2, socklen_t len2)
{
struct sockaddr_in* p1_in = (struct sockaddr_in*)addr1;
struct sockaddr_in* p2_in = (struct sockaddr_in*)addr2;
struct sockaddr_in6* p1_in6 = (struct sockaddr_in6*)addr1;
struct sockaddr_in6* p2_in6 = (struct sockaddr_in6*)addr2;
if(len1 < len2)
return -1;
if(len1 > len2)
return 1;
log_assert(len1 == len2);
if( p1_in->sin_family < p2_in->sin_family)
return -1;
if( p1_in->sin_family > p2_in->sin_family)
return 1;
log_assert( p1_in->sin_family == p2_in->sin_family );
/* compare ip4 */
if( p1_in->sin_family == AF_INET ) {
return memcmp(&p1_in->sin_addr, &p2_in->sin_addr, INET_SIZE);
} else if (p1_in6->sin6_family == AF_INET6) {
return memcmp(&p1_in6->sin6_addr, &p2_in6->sin6_addr,
INET6_SIZE);
} else {
/* eek unknown type, perform this comparison for sanity. */
return memcmp(addr1, addr2, len1);
}
}
int
addr_is_ip6(struct sockaddr_storage* addr, socklen_t len)
{
if(len == (socklen_t)sizeof(struct sockaddr_in6) &&
((struct sockaddr_in6*)addr)->sin6_family == AF_INET6)
return 1;
else return 0;
}
void
addr_mask(struct sockaddr_storage* addr, socklen_t len, int net)
{
uint8_t mask[8] = {0x0, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe};
int i, max;
uint8_t* s;
if(addr_is_ip6(addr, len)) {
s = (uint8_t*)&((struct sockaddr_in6*)addr)->sin6_addr;
max = 128;
} else {
s = (uint8_t*)&((struct sockaddr_in*)addr)->sin_addr;
max = 32;
}
if(net >= max)
return;
for(i=net/8+1; i<max/8; i++) {
s[i] = 0;
}
s[net/8] &= mask[net&0x7];
}
int
addr_in_common(struct sockaddr_storage* addr1, int net1,
struct sockaddr_storage* addr2, int net2, socklen_t addrlen)
{
int min = (net1<net2)?net1:net2;
int i, to;
int match = 0;
uint8_t* s1, *s2;
if(addr_is_ip6(addr1, addrlen)) {
s1 = (uint8_t*)&((struct sockaddr_in6*)addr1)->sin6_addr;
s2 = (uint8_t*)&((struct sockaddr_in6*)addr2)->sin6_addr;
to = 16;
} else {
s1 = (uint8_t*)&((struct sockaddr_in*)addr1)->sin_addr;
s2 = (uint8_t*)&((struct sockaddr_in*)addr2)->sin_addr;
to = 4;
}
/* match = bits_in_common(s1, s2, to); */
for(i=0; i<to; i++) {
if(s1[i] == s2[i]) {
match += 8;
} else {
uint8_t z = s1[i]^s2[i];
log_assert(z);
while(!(z&0x80)) {
match++;
z<<=1;
}
break;
}
}
if(match > min) match = min;
return match;
}
void
addr_to_str(struct sockaddr_storage* addr, socklen_t addrlen,
char* buf, size_t len)
{
int af = (int)((struct sockaddr_in*)addr)->sin_family;
void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
if(addr_is_ip6(addr, addrlen))
sinaddr = &((struct sockaddr_in6*)addr)->sin6_addr;
if(inet_ntop(af, sinaddr, buf, (socklen_t)len) == 0) {
snprintf(buf, len, "(inet_ntop_error)");
}
}
int
addr_is_ip4mapped(struct sockaddr_storage* addr, socklen_t addrlen)
{
/* prefix for ipv4 into ipv6 mapping is ::ffff:x.x.x.x */
const uint8_t map_prefix[16] =
{0,0,0,0, 0,0,0,0, 0,0,0xff,0xff, 0,0,0,0};
uint8_t* s;
if(!addr_is_ip6(addr, addrlen))
return 0;
/* s is 16 octet ipv6 address string */
s = (uint8_t*)&((struct sockaddr_in6*)addr)->sin6_addr;
return (memcmp(s, map_prefix, 12) == 0);
}
int addr_is_broadcast(struct sockaddr_storage* addr, socklen_t addrlen)
{
int af = (int)((struct sockaddr_in*)addr)->sin_family;
void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
return af == AF_INET && addrlen>=(socklen_t)sizeof(struct sockaddr_in)
&& memcmp(sinaddr, "\377\377\377\377", 4) == 0;
}
int addr_is_any(struct sockaddr_storage* addr, socklen_t addrlen)
{
int af = (int)((struct sockaddr_in*)addr)->sin_family;
void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
void* sin6addr = &((struct sockaddr_in6*)addr)->sin6_addr;
if(af == AF_INET && addrlen>=(socklen_t)sizeof(struct sockaddr_in)
&& memcmp(sinaddr, "\000\000\000\000", 4) == 0)
return 1;
else if(af==AF_INET6 && addrlen>=(socklen_t)sizeof(struct sockaddr_in6)
&& memcmp(sin6addr, "\000\000\000\000\000\000\000\000"
"\000\000\000\000\000\000\000\000", 16) == 0)
return 1;
return 0;
}
void sock_list_insert(struct sock_list** list, struct sockaddr_storage* addr,
socklen_t len, struct regional* region)
{
struct sock_list* add = (struct sock_list*)regional_alloc(region,
sizeof(*add) - sizeof(add->addr) + (size_t)len);
if(!add) {
log_err("out of memory in socketlist insert");
return;
}
log_assert(list);
add->next = *list;
add->len = len;
*list = add;
if(len) memmove(&add->addr, addr, len);
}
void sock_list_prepend(struct sock_list** list, struct sock_list* add)
{
struct sock_list* last = add;
if(!last)
return;
while(last->next)
last = last->next;
last->next = *list;
*list = add;
}
int sock_list_find(struct sock_list* list, struct sockaddr_storage* addr,
socklen_t len)
{
while(list) {
if(len == list->len) {
if(len == 0 || sockaddr_cmp_addr(addr, len,
&list->addr, list->len) == 0)
return 1;
}
list = list->next;
}
return 0;
}
void sock_list_merge(struct sock_list** list, struct regional* region,
struct sock_list* add)
{
struct sock_list* p;
for(p=add; p; p=p->next) {
if(!sock_list_find(*list, &p->addr, p->len))
sock_list_insert(list, &p->addr, p->len, region);
}
}
void
log_crypto_err(const char* str)
{
#ifdef HAVE_SSL
log_crypto_err_code(str, ERR_get_error());
#else
(void)str;
#endif /* HAVE_SSL */
}
void log_crypto_err_code(const char* str, unsigned long err)
{
#ifdef HAVE_SSL
/* error:[error code]:[library name]:[function name]:[reason string] */
char buf[128];
unsigned long e;
ERR_error_string_n(err, buf, sizeof(buf));
log_err("%s crypto %s", str, buf);
while( (e=ERR_get_error()) ) {
ERR_error_string_n(e, buf, sizeof(buf));
log_err("and additionally crypto %s", buf);
}
#else
(void)str;
(void)err;
#endif /* HAVE_SSL */
}
int
listen_sslctx_setup(void* ctxt)
{
#ifdef HAVE_SSL
SSL_CTX* ctx = (SSL_CTX*)ctxt;
/* no SSLv2, SSLv3 because has defects */
if((SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) & SSL_OP_NO_SSLv2)
!= SSL_OP_NO_SSLv2){
log_crypto_err("could not set SSL_OP_NO_SSLv2");
return 0;
}
if((SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv3) & SSL_OP_NO_SSLv3)
!= SSL_OP_NO_SSLv3){
log_crypto_err("could not set SSL_OP_NO_SSLv3");
return 0;
}
#if defined(SSL_OP_NO_TLSv1) && defined(SSL_OP_NO_TLSv1_1)
/* if we have tls 1.1 disable 1.0 */
if((SSL_CTX_set_options(ctx, SSL_OP_NO_TLSv1) & SSL_OP_NO_TLSv1)
!= SSL_OP_NO_TLSv1){
log_crypto_err("could not set SSL_OP_NO_TLSv1");
return 0;
}
#endif
#if defined(SSL_OP_NO_TLSv1_1) && defined(SSL_OP_NO_TLSv1_2)
/* if we have tls 1.2 disable 1.1 */
if((SSL_CTX_set_options(ctx, SSL_OP_NO_TLSv1_1) & SSL_OP_NO_TLSv1_1)
!= SSL_OP_NO_TLSv1_1){
log_crypto_err("could not set SSL_OP_NO_TLSv1_1");
return 0;
}
#endif
#if defined(SSL_OP_NO_RENEGOTIATION)
/* disable client renegotiation */
if((SSL_CTX_set_options(ctx, SSL_OP_NO_RENEGOTIATION) &
SSL_OP_NO_RENEGOTIATION) != SSL_OP_NO_RENEGOTIATION) {
log_crypto_err("could not set SSL_OP_NO_RENEGOTIATION");
return 0;
}
#endif
#if defined(SHA256_DIGEST_LENGTH) && defined(USE_ECDSA)
/* if we have sha256, set the cipher list to have no known vulns */
if(!SSL_CTX_set_cipher_list(ctx, "TLS13-CHACHA20-POLY1305-SHA256:TLS13-AES-256-GCM-SHA384:TLS13-AES-128-GCM-SHA256:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256"))
log_crypto_err("could not set cipher list with SSL_CTX_set_cipher_list");
#endif
if((SSL_CTX_set_options(ctx, SSL_OP_CIPHER_SERVER_PREFERENCE) &
SSL_OP_CIPHER_SERVER_PREFERENCE) !=
SSL_OP_CIPHER_SERVER_PREFERENCE) {
log_crypto_err("could not set SSL_OP_CIPHER_SERVER_PREFERENCE");
return 0;
}
#ifdef HAVE_SSL_CTX_SET_SECURITY_LEVEL
SSL_CTX_set_security_level(ctx, 0);
#endif
#else
(void)ctxt;
#endif /* HAVE_SSL */
return 1;
}
void
listen_sslctx_setup_2(void* ctxt)
{
#ifdef HAVE_SSL
SSL_CTX* ctx = (SSL_CTX*)ctxt;
(void)ctx;
#if HAVE_DECL_SSL_CTX_SET_ECDH_AUTO
if(!SSL_CTX_set_ecdh_auto(ctx,1)) {
log_crypto_err("Error in SSL_CTX_ecdh_auto, not enabling ECDHE");
}
#elif defined(USE_ECDSA)
if(1) {
EC_KEY *ecdh = EC_KEY_new_by_curve_name (NID_X9_62_prime256v1);
if (!ecdh) {
log_crypto_err("could not find p256, not enabling ECDHE");
} else {
if (1 != SSL_CTX_set_tmp_ecdh (ctx, ecdh)) {
log_crypto_err("Error in SSL_CTX_set_tmp_ecdh, not enabling ECDHE");
}
EC_KEY_free (ecdh);
}
}
#endif
#else
(void)ctxt;
#endif /* HAVE_SSL */
}
void* listen_sslctx_create(char* key, char* pem, char* verifypem)
{
#ifdef HAVE_SSL
SSL_CTX* ctx = SSL_CTX_new(SSLv23_server_method());
if(!ctx) {
log_crypto_err("could not SSL_CTX_new");
return NULL;
}
if(!key || key[0] == 0) {
log_err("error: no tls-service-key file specified");
SSL_CTX_free(ctx);
return NULL;
}
if(!pem || pem[0] == 0) {
log_err("error: no tls-service-pem file specified");
SSL_CTX_free(ctx);
return NULL;
}
if(!listen_sslctx_setup(ctx)) {
SSL_CTX_free(ctx);
return NULL;
}
if(!SSL_CTX_use_certificate_chain_file(ctx, pem)) {
log_err("error for cert file: %s", pem);
log_crypto_err("error in SSL_CTX use_certificate_chain_file");
SSL_CTX_free(ctx);
return NULL;
}
if(!SSL_CTX_use_PrivateKey_file(ctx, key, SSL_FILETYPE_PEM)) {
log_err("error for private key file: %s", key);
log_crypto_err("Error in SSL_CTX use_PrivateKey_file");
SSL_CTX_free(ctx);
return NULL;
}
if(!SSL_CTX_check_private_key(ctx)) {
log_err("error for key file: %s", key);
log_crypto_err("Error in SSL_CTX check_private_key");
SSL_CTX_free(ctx);
return NULL;
}
listen_sslctx_setup_2(ctx);
if(verifypem && verifypem[0]) {
if(!SSL_CTX_load_verify_locations(ctx, verifypem, NULL)) {
log_crypto_err("Error in SSL_CTX verify locations");
SSL_CTX_free(ctx);
return NULL;
}
SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(
verifypem));
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
}
return ctx;
#else
(void)key; (void)pem; (void)verifypem;
return NULL;
#endif
}
#ifdef USE_WINSOCK
/* For windows, the CA trust store is not read by openssl.
Add code to open the trust store using wincrypt API and add
the root certs into openssl trust store */
static int
add_WIN_cacerts_to_openssl_store(SSL_CTX* tls_ctx)
{
HCERTSTORE hSystemStore;
PCCERT_CONTEXT pTargetCert = NULL;
X509_STORE* store;
verbose(VERB_ALGO, "Adding Windows certificates from system root store to CA store");
/* load just once per context lifetime for this version
TODO: dynamically update CA trust changes as they are available */
if (!tls_ctx)
return 0;
/* Call wincrypt's CertOpenStore to open the CA root store. */
if ((hSystemStore = CertOpenStore(
CERT_STORE_PROV_SYSTEM,
0,
0,
/* NOTE: mingw does not have this const: replace with 1 << 16 from code
CERT_SYSTEM_STORE_CURRENT_USER, */
1 << 16,
L"root")) == 0)
{
return 0;
}
store = SSL_CTX_get_cert_store(tls_ctx);
if (!store)
return 0;
/* failure if the CA store is empty or the call fails */
if ((pTargetCert = CertEnumCertificatesInStore(
hSystemStore, pTargetCert)) == 0) {
verbose(VERB_ALGO, "CA certificate store for Windows is empty.");
return 0;
}
/* iterate over the windows cert store and add to openssl store */
do
{
X509 *cert1 = d2i_X509(NULL,
(const unsigned char **)&pTargetCert->pbCertEncoded,
pTargetCert->cbCertEncoded);
if (!cert1) {
/* return error if a cert fails */
verbose(VERB_ALGO, "%s %d:%s",
"Unable to parse certificate in memory",
(int)ERR_get_error(), ERR_error_string(ERR_get_error(), NULL));
return 0;
}
else {
/* return error if a cert add to store fails */
if (X509_STORE_add_cert(store, cert1) == 0) {
unsigned long error = ERR_peek_last_error();
/* Ignore error X509_R_CERT_ALREADY_IN_HASH_TABLE which means the
* certificate is already in the store. */
if(ERR_GET_LIB(error) != ERR_LIB_X509 ||
ERR_GET_REASON(error) != X509_R_CERT_ALREADY_IN_HASH_TABLE) {
verbose(VERB_ALGO, "%s %d:%s\n",
"Error adding certificate", (int)ERR_get_error(),
ERR_error_string(ERR_get_error(), NULL));
X509_free(cert1);
return 0;
}
}
X509_free(cert1);
}
} while ((pTargetCert = CertEnumCertificatesInStore(
hSystemStore, pTargetCert)) != 0);
/* Clean up memory and quit. */
if (pTargetCert)
CertFreeCertificateContext(pTargetCert);
if (hSystemStore)
{
if (!CertCloseStore(
hSystemStore, 0))
return 0;
}
verbose(VERB_ALGO, "Completed adding Windows certificates to CA store successfully");
return 1;
}
#endif /* USE_WINSOCK */
void* connect_sslctx_create(char* key, char* pem, char* verifypem, int wincert)
{
#ifdef HAVE_SSL
SSL_CTX* ctx = SSL_CTX_new(SSLv23_client_method());
if(!ctx) {
log_crypto_err("could not allocate SSL_CTX pointer");
return NULL;
}
if((SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) & SSL_OP_NO_SSLv2)
!= SSL_OP_NO_SSLv2) {
log_crypto_err("could not set SSL_OP_NO_SSLv2");
SSL_CTX_free(ctx);
return NULL;
}
if((SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv3) & SSL_OP_NO_SSLv3)
!= SSL_OP_NO_SSLv3) {
log_crypto_err("could not set SSL_OP_NO_SSLv3");
SSL_CTX_free(ctx);
return NULL;
}
#if defined(SSL_OP_NO_RENEGOTIATION)
/* disable client renegotiation */
if((SSL_CTX_set_options(ctx, SSL_OP_NO_RENEGOTIATION) &
SSL_OP_NO_RENEGOTIATION) != SSL_OP_NO_RENEGOTIATION) {
log_crypto_err("could not set SSL_OP_NO_RENEGOTIATION");
return 0;
}
#endif
if(key && key[0]) {
if(!SSL_CTX_use_certificate_chain_file(ctx, pem)) {
log_err("error in client certificate %s", pem);
log_crypto_err("error in certificate file");
SSL_CTX_free(ctx);
return NULL;
}
if(!SSL_CTX_use_PrivateKey_file(ctx, key, SSL_FILETYPE_PEM)) {
log_err("error in client private key %s", key);
log_crypto_err("error in key file");
SSL_CTX_free(ctx);
return NULL;
}
if(!SSL_CTX_check_private_key(ctx)) {
log_err("error in client key %s", key);
log_crypto_err("error in SSL_CTX_check_private_key");
SSL_CTX_free(ctx);
return NULL;
}
}
if((verifypem && verifypem[0]) || wincert) {
if(verifypem && verifypem[0]) {
if(!SSL_CTX_load_verify_locations(ctx, verifypem, NULL)) {
log_crypto_err("error in SSL_CTX verify");
SSL_CTX_free(ctx);
return NULL;
}
}
#ifdef USE_WINSOCK
if(wincert) {
if(!add_WIN_cacerts_to_openssl_store(ctx)) {
log_crypto_err("error in add_WIN_cacerts_to_openssl_store");
SSL_CTX_free(ctx);
return NULL;
}
}
#else
(void)wincert;
#endif
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
}
return ctx;
#else
(void)key; (void)pem; (void)verifypem; (void)wincert;
return NULL;
#endif
}
void* incoming_ssl_fd(void* sslctx, int fd)
{
#ifdef HAVE_SSL
SSL* ssl = SSL_new((SSL_CTX*)sslctx);
if(!ssl) {
log_crypto_err("could not SSL_new");
return NULL;
}
SSL_set_accept_state(ssl);
(void)SSL_set_mode(ssl, (long)SSL_MODE_AUTO_RETRY);
if(!SSL_set_fd(ssl, fd)) {
log_crypto_err("could not SSL_set_fd");
SSL_free(ssl);
return NULL;
}
return ssl;
#else
(void)sslctx; (void)fd;
return NULL;
#endif
}
void* outgoing_ssl_fd(void* sslctx, int fd)
{
#ifdef HAVE_SSL
SSL* ssl = SSL_new((SSL_CTX*)sslctx);
if(!ssl) {
log_crypto_err("could not SSL_new");
return NULL;
}
SSL_set_connect_state(ssl);
(void)SSL_set_mode(ssl, (long)SSL_MODE_AUTO_RETRY);
if(!SSL_set_fd(ssl, fd)) {
log_crypto_err("could not SSL_set_fd");
SSL_free(ssl);
return NULL;
}
return ssl;
#else
(void)sslctx; (void)fd;
return NULL;
#endif
}
#if defined(HAVE_SSL) && defined(OPENSSL_THREADS) && !defined(THREADS_DISABLED) && defined(CRYPTO_LOCK) && OPENSSL_VERSION_NUMBER < 0x10100000L
/** global lock list for openssl locks */
static lock_basic_type *ub_openssl_locks = NULL;
/** callback that gets thread id for openssl */
#ifdef HAVE_CRYPTO_THREADID_SET_CALLBACK
static void
ub_crypto_id_cb(CRYPTO_THREADID *id)
{
CRYPTO_THREADID_set_numeric(id, (unsigned long)log_thread_get());
}
#else
static unsigned long
ub_crypto_id_cb(void)
{
return (unsigned long)log_thread_get();
}
#endif
static void
ub_crypto_lock_cb(int mode, int type, const char *ATTR_UNUSED(file),
int ATTR_UNUSED(line))
{
if((mode&CRYPTO_LOCK)) {
lock_basic_lock(&ub_openssl_locks[type]);
} else {
lock_basic_unlock(&ub_openssl_locks[type]);
}
}
#endif /* OPENSSL_THREADS */
int ub_openssl_lock_init(void)
{
#if defined(HAVE_SSL) && defined(OPENSSL_THREADS) && !defined(THREADS_DISABLED) && defined(CRYPTO_LOCK) && OPENSSL_VERSION_NUMBER < 0x10100000L
int i;
ub_openssl_locks = (lock_basic_type*)reallocarray(
NULL, (size_t)CRYPTO_num_locks(), sizeof(lock_basic_type));
if(!ub_openssl_locks)
return 0;
for(i=0; i<CRYPTO_num_locks(); i++) {
lock_basic_init(&ub_openssl_locks[i]);
}
# ifdef HAVE_CRYPTO_THREADID_SET_CALLBACK
CRYPTO_THREADID_set_callback(&ub_crypto_id_cb);
# else
CRYPTO_set_id_callback(&ub_crypto_id_cb);
# endif
CRYPTO_set_locking_callback(&ub_crypto_lock_cb);
#endif /* OPENSSL_THREADS */
return 1;
}
void ub_openssl_lock_delete(void)
{
#if defined(HAVE_SSL) && defined(OPENSSL_THREADS) && !defined(THREADS_DISABLED) && defined(CRYPTO_LOCK) && OPENSSL_VERSION_NUMBER < 0x10100000L
int i;
if(!ub_openssl_locks)
return;
# ifdef HAVE_CRYPTO_THREADID_SET_CALLBACK
CRYPTO_THREADID_set_callback(NULL);
# else
CRYPTO_set_id_callback(NULL);
# endif
CRYPTO_set_locking_callback(NULL);
for(i=0; i<CRYPTO_num_locks(); i++) {
lock_basic_destroy(&ub_openssl_locks[i]);
}
free(ub_openssl_locks);
#endif /* OPENSSL_THREADS */
}
int listen_sslctx_setup_ticket_keys(void* sslctx, struct config_strlist* tls_session_ticket_keys) {
#ifdef HAVE_SSL
size_t s = 1;
struct config_strlist* p;
struct tls_session_ticket_key *keys;
for(p = tls_session_ticket_keys; p; p = p->next) {
s++;
}
keys = calloc(s, sizeof(struct tls_session_ticket_key));
memset(keys, 0, s*sizeof(*keys));
ticket_keys = keys;
for(p = tls_session_ticket_keys; p; p = p->next) {
size_t n;
unsigned char *data = (unsigned char *)malloc(80);
FILE *f = fopen(p->str, "r");
if(!f) {
log_err("could not read tls-session-ticket-key %s: %s", p->str, strerror(errno));
free(data);
return 0;
}
n = fread(data, 1, 80, f);
fclose(f);
if(n != 80) {
log_err("tls-session-ticket-key %s is %d bytes, must be 80 bytes", p->str, (int)n);
free(data);
return 0;
}
verbose(VERB_OPS, "read tls-session-ticket-key: %s", p->str);
keys->key_name = data;
keys->aes_key = data + 16;
keys->hmac_key = data + 48;
keys++;
}
/* terminate array with NULL key name entry */
keys->key_name = NULL;
if(SSL_CTX_set_tlsext_ticket_key_cb(sslctx, tls_session_ticket_key_cb) == 0) {
log_err("no support for TLS session ticket");
return 0;
}
return 1;
#else
(void)sslctx;
(void)tls_session_ticket_keys;
return 0;
#endif
}
int tls_session_ticket_key_cb(void *ATTR_UNUSED(sslctx), unsigned char* key_name, unsigned char* iv, void *evp_sctx, void *hmac_ctx, int enc)
{
#ifdef HAVE_SSL
const EVP_MD *digest;
const EVP_CIPHER *cipher;
int evp_cipher_length;
digest = EVP_sha256();
cipher = EVP_aes_256_cbc();
evp_cipher_length = EVP_CIPHER_iv_length(cipher);
if( enc == 1 ) {
/* encrypt */
verbose(VERB_CLIENT, "start session encrypt");
memcpy(key_name, ticket_keys->key_name, 16);
if (RAND_bytes(iv, evp_cipher_length) != 1) {
verbose(VERB_CLIENT, "RAND_bytes failed");
return -1;
}
if (EVP_EncryptInit_ex(evp_sctx, cipher, NULL, ticket_keys->aes_key, iv) != 1) {
verbose(VERB_CLIENT, "EVP_EncryptInit_ex failed");
return -1;
}
#ifndef HMAC_INIT_EX_RETURNS_VOID
if (HMAC_Init_ex(hmac_ctx, ticket_keys->hmac_key, 32, digest, NULL) != 1) {
verbose(VERB_CLIENT, "HMAC_Init_ex failed");
return -1;
}
#else
HMAC_Init_ex(hmac_ctx, ticket_keys->hmac_key, 32, digest, NULL);
#endif
return 1;
} else if (enc == 0) {
/* decrypt */
struct tls_session_ticket_key *key;
verbose(VERB_CLIENT, "start session decrypt");
for(key = ticket_keys; key->key_name != NULL; key++) {
if (!memcmp(key_name, key->key_name, 16)) {
verbose(VERB_CLIENT, "Found session_key");
break;
}
}
if(key->key_name == NULL) {
verbose(VERB_CLIENT, "Not found session_key");
return 0;
}
#ifndef HMAC_INIT_EX_RETURNS_VOID
if (HMAC_Init_ex(hmac_ctx, key->hmac_key, 32, digest, NULL) != 1) {
verbose(VERB_CLIENT, "HMAC_Init_ex failed");
return -1;
}
#else
HMAC_Init_ex(hmac_ctx, key->hmac_key, 32, digest, NULL);
#endif
if (EVP_DecryptInit_ex(evp_sctx, cipher, NULL, key->aes_key, iv) != 1) {
log_err("EVP_DecryptInit_ex failed");
return -1;
}
return (key == ticket_keys) ? 1 : 2;
}
return -1;
#else
(void)key_name;
(void)iv;
(void)evp_sctx;
(void)hmac_ctx;
(void)enc;
return 0;
#endif
}
void
listen_sslctx_delete_ticket_keys(void)
{
struct tls_session_ticket_key *key;
if(!ticket_keys) return;
for(key = ticket_keys; key->key_name != NULL; key++) {
/* wipe key data from memory*/
#ifdef HAVE_EXPLICIT_BZERO
explicit_bzero(key->key_name, 80);
#else
memset(key->key_name, 0xdd, 80);
#endif
free(key->key_name);
}
free(ticket_keys);
ticket_keys = NULL;
}
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