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RPKI protocol with one cache server per protocol

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The RPKI protocol (RFC 6810) using the RTRLib
(http://rpki.realmv6.org/) that is integrated inside
the BIRD's code.

Implemeted transports are:
 - unprotected transport over TCP
 - secure transport over SSHv2

Example configuration of bird.conf:
  ...
  roa4 table r4;
  roa6 table r6;

  protocol rpki {
    debug all;

    # Import both IPv4 and IPv6 ROAs
    roa4 { table r4; };
    roa6 { table r6; };

    # Set cache server (validator) address,
    # overwrite default port 323
    remote "rpki-validator.realmv6.org" port 8282;

    # Overwrite default time intervals
    retry   10;         # Default 600 seconds
    refresh 60;         # Default 3600 seconds
    expire 600;         # Default 7200 seconds
  }

  protocol rpki {
    debug all;

    # Import only IPv4 routes
    roa4 { table r4; };

    # Set cache server address to localhost,
    # use default ports tcp => 323 or ssh => 22
    remote 127.0.0.1;

    # Use SSH transport instead of unprotected transport over TCP
    ssh encryption {
      bird private key "/home/birdgeek/.ssh/id_rsa";
      remote public key "/home/birdgeek/.ssh/known_hosts";
      user "birdgeek";
    };
  }
  ...
This commit is contained in:
Pavel Tvrdík 2015-09-17 17:15:30 +02:00 committed by Pavel Tvrdik
parent dc9f0826d6
commit 4661035431
32 changed files with 3325 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Makefile.in
View File

@ -10,6 +10,7 @@ CPPFLAGS=-I$(objdir) -I$(srcdir) @CPPFLAGS@
CFLAGS=$(CPPFLAGS) @CFLAGS@ CFLAGS=$(CPPFLAGS) @CFLAGS@
LDFLAGS=@LDFLAGS@ LDFLAGS=@LDFLAGS@
LIBS=@LIBS@ LIBS=@LIBS@
DAEMON_LIBS=@DAEMON_LIBS@
CLIENT_LIBS=@CLIENT_LIBS@ CLIENT_LIBS=@CLIENT_LIBS@
CC=@CC@ CC=@CC@
M4=@M4@ M4=@M4@
@ -55,6 +56,8 @@ all: daemon cli
daemon: $(daemon) daemon: $(daemon)
cli: $(client) cli: $(client)
$(daemon): LIBS += $(DAEMON_LIBS)
# Include directories # Include directories
dirs := client conf doc filter lib nest $(addprefix proto/,$(protocols)) @sysdep_dirs@ dirs := client conf doc filter lib nest $(addprefix proto/,$(protocols)) @sysdep_dirs@

6
configure.in
View File

@ -168,7 +168,7 @@ fi
AC_SUBST(iproutedir) AC_SUBST(iproutedir)
# all_protocols="$proto_bfd bgp ospf pipe radv rip static" # all_protocols="$proto_bfd bgp ospf pipe radv rip static"
all_protocols="$proto_bfd ospf pipe radv rip static" all_protocols="$proto_bfd ospf pipe radv rip rpki static"
all_protocols=`echo $all_protocols | sed 's/ /,/g'` all_protocols=`echo $all_protocols | sed 's/ /,/g'`
@ -226,6 +226,10 @@ if test "$enable_debug" = yes ; then
fi fi
fi fi
DAEMON_LIBS=
AC_CHECK_LIB(dl, dlopen, DAEMON_LIBS="-ldl")
AC_SUBST(DAEMON_LIBS)
CLIENT=birdcl CLIENT=birdcl
CLIENT_LIBS= CLIENT_LIBS=
if test "$enable_client" = yes ; then if test "$enable_client" = yes ; then

132
doc/bird.sgml
View File

@ -464,7 +464,7 @@ protocol rip {
Create a new ROA (Route Origin Authorization) table. ROA tables can be Create a new ROA (Route Origin Authorization) table. ROA tables can be
used to validate route origination of BGP routes. A ROA table contains used to validate route origination of BGP routes. A ROA table contains
ROA entries, each consist of a network prefix, a max prefix length and ROA entries, each consist of a network prefix, a max prefix length and
an AS number. A ROA entry specifies prefixes which could be originated an AS (Autonomous System) number. A ROA entry specifies prefixes which could be originated
by that AS number. ROA tables could be filled with data from RPKI (RFC by that AS number. ROA tables could be filled with data from RPKI (RFC
6480) or from public databases like Whois. ROA tables are examined by 6480) or from public databases like Whois. ROA tables are examined by
<cf/roa_check()/ operator in filters. <cf/roa_check()/ operator in filters.
@ -3494,6 +3494,136 @@ protocol rip {
} }
</code> </code>
<sect>RPKI
<p>The Resource Public Key Infrastructure (RPKI) to Router Protocol (RFC 6810)
is a protocol for receiving Route Origin Authorizations (ROAs) from trusted
caches (RPKI validators). ROAs are documents used to link a set of prefixes
with an origin ASN.
The ROAs could be
In BIRD, it is implemented only receiving prefix origin data from a trusted cache.
RPKI-based origin validation uses some of the RPKI data to allow a router
to version ... FIXME! srify that the autonomous system announcing an IP address prefix is in fact
authorized to do so. This is not crypto checked so can be violated. But it
should prevent the vast majority of accidental 'hijackings' on the internet
It is possible to configure only one remote cache server per protocol yet.
<code>
protocol rpki [&lt;name&gt;] {
remote &lt;ip&gt; | "&lt;domain&gt;" [port &lt;num&gt;];
port &lt;num&gt;;
retry &lt;num&gt;;
refresh &lt;num&gt;;
expire &lt;num&gt;;
ssh encryption {
bird private key "&lt;/path/to/id_rsa&gt;";
remote public key "&lt;/path/to/known_host&gt;";
user "&lt;name&gt;";
};
}
</code>
<sect1>RPKI protocol options
<descrip>
<tag>roa table <m/name/</tag>
Specifies the roa table into which will import the routes from cache.
This option is required.
<tag>remote <m/ip/ | "<m/hostname/" [port &lt;num&gt;]</tag>
Specifies a destination address of the cache server.
Can be specified by an IP address or by full domain name.
Only one cache can be specified per protocol.
<tag>port <m/num/</tag>
Specifies the port number.
The default port number is 323 for transport without any encryption
and 22 for transport with SSH encryption.
<tag>retry <m/num/</tag>
Time period in seconds between a failed query and the next attempt.
Default: 600 seconds
<tag>refresh <m/num/</tag>
Time period in seconds.
Tells how long to wait before next attempting to poll the cache, using
a Serial Query or Reset Query PDU. Must be lower than 1 hour.
Default: 3600 seconds
<tag>expire <m/num/</tag>
Time period in seconds.
Received records are deleted if the client was unable to refresh data
for this time period.
Default: 7200 seconds
<tag>ssh encryption { <m/ssh encryption options.../ }</tag>
This enables a SSH encryption.
Default: off
</descrip>
<sect1>SSH encryption options in RPKI protocol
<descrip>
<tag>bird private key "<m///path/to/id_rsa"</tag>
A path to the BIRD's private SSH key for authentication.
It can be a <cf/id_rsa/ file.
<tag>remote public key "<m///path/to/known_host"</tag>
A path to the cache's public SSH key for verification identity
of the cache server. It could be a <cf/known_host/ file.
<tag>user "<m/name/"</tag>
A SSH user name for authentication. This option is a required.
</descrip>
<sect1>Examples:
<p>Typical RPKI configuration with BGP origin validation
<code>
roa4 table r4;
roa6 table r6;
protocol rpki {
debug all;
roa4 { table r4; };
roa6 { table r6; };
remote "rpki-validator.realmv6.org";
}
filter peer_in {
if (roa_check(r4, net, bgp_path.last) = ROA_INVALID ||
roa_check(r6, net, bgp_path.last) = ROA_INVALID) then
{
print "ROA check failed for ", net, " ASN ", bgp_path.last;
reject;
}
accept;
}
protocol bgp my_peer {
local as 65000;
neighbor 192.0.2.1 as 65001;
import filter peer_in;
}
</code>
<p>A configuration using SSHv2 transport encryption:
<code>
roa4 table r4;
roa6 table r6;
protocol rpki {
debug all;
roa4 { table r4; };
roa6 { table r6; };
remote 127.0.0.1 port 2345;
ssh encryption {
bird private key "/home/birdgeek/.ssh/id_rsa";
remote public key "/home/birdgeek/.ssh/known_hosts";
user "birdgeek";
};
}
</code>
<sect>Static <sect>Static

8
filter/filter.c
View File

@ -1277,11 +1277,15 @@ interpret(struct f_inst *what)
} }
struct rtable *table = ((struct f_inst_roa_check *) what)->rtc->table; struct rtable *table = ((struct f_inst_roa_check *) what)->rtc->table;
if (!table || table->addr_type != (v1.val.net->type == NET_IP4 ? NET_ROA4 : NET_ROA6)) if (!table || (table->addr_type != NET_ROA4 && table->addr_type != NET_ROA6))
runtime("Missing ROA table"); runtime("Missing ROA table");
res.type = T_ENUM_ROA; res.type = T_ENUM_ROA;
res.val.i = net_roa_check(table, v1.val.net, as);
if (table->addr_type != (v1.val.net->type == NET_IP4 ? NET_ROA4 : NET_ROA6))
res.val.i = ROA_UNKNOWN; /* Prefix and table type mismatch */
else
res.val.i = net_roa_check(table, v1.val.net, as);
break; break;

2
lib/Makefile
View File

@ -2,6 +2,6 @@ src := bitops.c checksum.c ip.c lists.c md5.c net.c patmatch.c printf.c sha1.c s
obj := $(src-o-files) obj := $(src-o-files)
$(all-client) $(all-client)
src := bitops.c checksum.c event.c idm.c ip.c lists.c md5.c mempool.c net.c patmatch.c printf.c resource.c sha1.c sha256.c sha512.c slab.c slists.c tbf.c xmalloc.c src := bitops.c checksum.c event.c idm.c ip.c libssh.c lists.c md5.c mempool.c net.c patmatch.c printf.c resource.c sha1.c sha256.c sha512.c slab.c slists.c tbf.c xmalloc.c
obj := $(src-o-files) obj := $(src-o-files)
$(all-daemon) $(all-daemon)

150
lib/libssh.c Normal file
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@ -0,0 +1,150 @@
/*
* BIRD -- Mockup of SSH Library for loading LibSSH using dlopen
*
* (c) 2015 CZ.NIC
*
* This file was part of SSH Library: http://www.libssh.org/
* (c) 2003-2009 by Aris Adamantiadis (SSH Library)
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <dlfcn.h>
#include "nest/bird.h"
#include "lib/libssh.h"
#define FILENAME_OF_SHARED_OBJECT_LIBSSH "libssh.so"
ssh_session (*ssh_new)(void);
void (*ssh_set_blocking)(ssh_session session, int blocking);
int (*ssh_options_set)(ssh_session session, enum ssh_options_e type, const void *value);
int (*ssh_connect)(ssh_session session);
socket_t (*ssh_get_fd)(ssh_session session);
int (*ssh_is_server_known)(ssh_session session);
int (*ssh_userauth_publickey_auto)(ssh_session session, const char *username, const char *passphrase);
const char * (*ssh_get_error)(void *error);
int (*ssh_get_error_code)(void *error);
void (*ssh_disconnect)(ssh_session session);
void (*ssh_free)(ssh_session session);
ssh_channel (*ssh_channel_new)(ssh_session session);
int (*ssh_channel_is_open)(ssh_channel channel);
int (*ssh_channel_close)(ssh_channel channel);
void (*ssh_channel_free)(ssh_channel channel);
int (*ssh_channel_open_session)(ssh_channel channel);
int (*ssh_channel_request_subsystem)(ssh_channel channel, const char *subsystem);
int (*ssh_channel_read_nonblocking)(ssh_channel channel, void *dest, uint32_t count, int is_stderr);
int (*ssh_channel_is_eof)(ssh_channel channel);
int (*ssh_channel_select)(ssh_channel *readchans, ssh_channel *writechans, ssh_channel *exceptchans, struct timeval * timeout);
int (*ssh_channel_write)(ssh_channel channel, const void *data, uint32_t len);
static void *libssh;
/*
* @return NULL if success
* @return string with error if failed
*/
const char *
load_libssh(void)
{
char *err_buf;
libssh = dlopen(FILENAME_OF_SHARED_OBJECT_LIBSSH, RTLD_LAZY);
if (!libssh)
{
/* This would be probably often repeated problem */
char *help_msg = "You have to install libssh library.";
err_buf = mb_alloc(&root_pool, 512); /* FIXME: free memory */
bsnprintf(err_buf, 512, "%s. %s", dlerror(), help_msg);
return err_buf;
}
dlerror(); /* Clear any existing error */
ssh_new = (ssh_session (*)(void)) dlsym(libssh, "ssh_new");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_set_blocking = (void (*)(ssh_session, int)) dlsym(libssh, "ssh_set_blocking");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_options_set = (int (*)(ssh_session, enum ssh_options_e, const void *)) dlsym(libssh, "ssh_options_set");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_connect = (int (*)(ssh_session)) dlsym(libssh, "ssh_connect");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_get_fd = (socket_t (*)(ssh_session)) dlsym(libssh, "ssh_get_fd");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_is_server_known = (int (*)(ssh_session)) dlsym(libssh, "ssh_is_server_known");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_userauth_publickey_auto = (int (*)(ssh_session, const char *, const char *)) dlsym(libssh, "ssh_userauth_publickey_auto");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_get_error = (const char * (*)(void *)) dlsym(libssh, "ssh_get_error");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_get_error_code = (int (*)(void *)) dlsym(libssh, "ssh_get_error_code");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_disconnect = (void (*)(ssh_session)) dlsym(libssh, "ssh_disconnect");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_free = (void (*)(ssh_session)) dlsym(libssh, "ssh_free");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_channel_new = (ssh_channel (*)(ssh_session)) dlsym(libssh, "ssh_channel_new");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_channel_is_open = (int (*)(ssh_channel)) dlsym(libssh, "ssh_channel_is_open");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_channel_close = (int (*)(ssh_channel)) dlsym(libssh, "ssh_channel_close");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_channel_free = (void (*)(ssh_channel)) dlsym(libssh, "ssh_channel_free");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_channel_open_session = (int (*)(ssh_channel)) dlsym(libssh, "ssh_channel_open_session");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_channel_request_subsystem = (int (*)(ssh_channel, const char *)) dlsym(libssh, "ssh_channel_request_subsystem");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_channel_read_nonblocking = (int (*)(ssh_channel, void *, uint32_t, int)) dlsym(libssh, "ssh_channel_read_nonblocking");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_channel_is_eof = (int (*)(ssh_channel)) dlsym(libssh, "ssh_channel_is_eof");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_channel_select = (int (*)(ssh_channel *, ssh_channel *, ssh_channel *, struct timeval *)) dlsym(libssh, "ssh_channel_select");
if ((err_buf = dlerror()) != NULL)
return err_buf;
ssh_channel_write = (int (*)(ssh_channel, const void *, uint32_t)) dlsym(libssh, "ssh_channel_write");
if ((err_buf = dlerror()) != NULL)
return err_buf;
return NULL;
}

133
lib/libssh.h Normal file
View File

@ -0,0 +1,133 @@
/*
* BIRD -- Mockup headers of SSH Library for loading LibSSH using dlopen
*
* (c) 2015 CZ.NIC
*
* This file was part of SSH Library: http://www.libssh.org/
* (c) 2003-2009 by Aris Adamantiadis (SSH Library)
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_LIBSSH_H_
#define _BIRD_LIBSSH_H_
#include <unistd.h>
#include <inttypes.h>
typedef struct ssh_session_struct* ssh_session;
typedef struct ssh_channel_struct* ssh_channel;
/* Error return codes */
#define SSH_OK 0 /* No error */
#define SSH_ERROR -1 /* Error of some kind */
#define SSH_AGAIN -2 /* The nonblocking call must be repeated */
#define SSH_EOF -127 /* We have already a eof */
enum ssh_server_known_e {
SSH_SERVER_ERROR=-1,
SSH_SERVER_NOT_KNOWN=0,
SSH_SERVER_KNOWN_OK,
SSH_SERVER_KNOWN_CHANGED,
SSH_SERVER_FOUND_OTHER,
SSH_SERVER_FILE_NOT_FOUND
};
enum ssh_auth_e {
SSH_AUTH_SUCCESS=0,
SSH_AUTH_DENIED,
SSH_AUTH_PARTIAL,
SSH_AUTH_INFO,
SSH_AUTH_AGAIN,
SSH_AUTH_ERROR=-1
};
enum ssh_error_types_e {
SSH_NO_ERROR=0,
SSH_REQUEST_DENIED,
SSH_FATAL,
SSH_EINTR
};
enum ssh_options_e {
SSH_OPTIONS_HOST,
SSH_OPTIONS_PORT,
SSH_OPTIONS_PORT_STR,
SSH_OPTIONS_FD,
SSH_OPTIONS_USER,
SSH_OPTIONS_SSH_DIR,
SSH_OPTIONS_IDENTITY,
SSH_OPTIONS_ADD_IDENTITY,
SSH_OPTIONS_KNOWNHOSTS,
SSH_OPTIONS_TIMEOUT,
SSH_OPTIONS_TIMEOUT_USEC,
SSH_OPTIONS_SSH1,
SSH_OPTIONS_SSH2,
SSH_OPTIONS_LOG_VERBOSITY,
SSH_OPTIONS_LOG_VERBOSITY_STR,
SSH_OPTIONS_CIPHERS_C_S,
SSH_OPTIONS_CIPHERS_S_C,
SSH_OPTIONS_COMPRESSION_C_S,
SSH_OPTIONS_COMPRESSION_S_C,
SSH_OPTIONS_PROXYCOMMAND,
SSH_OPTIONS_BINDADDR,
SSH_OPTIONS_STRICTHOSTKEYCHECK,
SSH_OPTIONS_COMPRESSION,
SSH_OPTIONS_COMPRESSION_LEVEL,
SSH_OPTIONS_KEY_EXCHANGE,
SSH_OPTIONS_HOSTKEYS,
SSH_OPTIONS_GSSAPI_SERVER_IDENTITY,
SSH_OPTIONS_GSSAPI_CLIENT_IDENTITY,
SSH_OPTIONS_GSSAPI_DELEGATE_CREDENTIALS,
SSH_OPTIONS_HMAC_C_S,
SSH_OPTIONS_HMAC_S_C,
};
enum {
/** No logging at all
*/
SSH_LOG_NOLOG=0,
/** Only warnings
*/
SSH_LOG_WARNING,
/** High level protocol information
*/
SSH_LOG_PROTOCOL,
/** Lower level protocol infomations, packet level
*/
SSH_LOG_PACKET,
/** Every function path
*/
SSH_LOG_FUNCTIONS
};
#ifndef socket_t
typedef int socket_t;
#endif
extern ssh_session (*ssh_new)(void);
extern void (*ssh_set_blocking)(ssh_session session, int blocking);
extern int (*ssh_options_set)(ssh_session session, enum ssh_options_e type, const void *value);
extern int (*ssh_connect)(ssh_session session);
extern socket_t (*ssh_get_fd)(ssh_session session);
extern int (*ssh_is_server_known)(ssh_session session);
extern int (*ssh_userauth_publickey_auto)(ssh_session session, const char *username, const char *passphrase);
extern const char * (*ssh_get_error)(void *error);
extern int (*ssh_get_error_code)(void *error);
extern void (*ssh_disconnect)(ssh_session session);
extern void (*ssh_free)(ssh_session session);
extern ssh_channel (*ssh_channel_new)(ssh_session session);
extern int (*ssh_channel_is_open)(ssh_channel channel);
extern int (*ssh_channel_close)(ssh_channel channel);
extern void (*ssh_channel_free)(ssh_channel channel);
extern int (*ssh_channel_open_session)(ssh_channel channel);
extern int (*ssh_channel_request_subsystem)(ssh_channel channel, const char *subsystem);
extern int (*ssh_channel_read_nonblocking)(ssh_channel channel, void *dest, uint32_t count, int is_stderr);
extern int (*ssh_channel_is_eof)(ssh_channel channel);
extern int (*ssh_channel_select)(ssh_channel *readchans, ssh_channel *writechans, ssh_channel *exceptchans, struct timeval * timeout);
extern int (*ssh_channel_write)(ssh_channel channel, const void *data, uint32_t len);
const char *load_libssh(void);
#endif /* _BIRD_LIBSSH_H_ */

4
lib/net.c
View File

@ -8,7 +8,9 @@ const char * const net_label[] = {
[NET_IP4] = "ipv4", [NET_IP4] = "ipv4",
[NET_IP6] = "ipv6", [NET_IP6] = "ipv6",
[NET_VPN4] = "vpn4", [NET_VPN4] = "vpn4",
[NET_VPN6] = "vpn6" [NET_VPN6] = "vpn6",
[NET_ROA4] = "roa4",
[NET_ROA6] = "roa6",
}; };
const u16 net_addr_length[] = { const u16 net_addr_length[] = {

2
lib/net.h
View File

@ -25,6 +25,8 @@
#define NB_IP6 (1 << NET_IP6) #define NB_IP6 (1 << NET_IP6)
#define NB_VPN4 (1 << NET_VPN4) #define NB_VPN4 (1 << NET_VPN4)
#define NB_VPN6 (1 << NET_VPN6) #define NB_VPN6 (1 << NET_VPN6)
#define NB_ROA4 (1 << NET_ROA4)
#define NB_ROA6 (1 << NET_ROA6)
#define NB_IP (NB_IP4 | NB_IP6) #define NB_IP (NB_IP4 | NB_IP6)
#define NB_ANY 0xffffffff #define NB_ANY 0xffffffff

4
lib/resource.c
View File

@ -31,7 +31,7 @@
struct pool { struct pool {
resource r; resource r;
list inside; list inside;
char *name; const char *name;
}; };
static void pool_dump(resource *); static void pool_dump(resource *);
@ -61,7 +61,7 @@ static int indent;
* parent pool. * parent pool.
*/ */
pool * pool *
rp_new(pool *p, char *name) rp_new(pool *p, const char *name)
{ {
pool *z = ralloc(p, &pool_class); pool *z = ralloc(p, &pool_class);
z->name = name; z->name = name;

2
lib/resource.h
View File

@ -37,7 +37,7 @@ struct resclass {
typedef struct pool pool; typedef struct pool pool;
void resource_init(void); void resource_init(void);
pool *rp_new(pool *, char *); /* Create new pool */ pool *rp_new(pool *, const char *); /* Create new pool */
void rfree(void *); /* Free single resource */ void rfree(void *); /* Free single resource */
void rdump(void *); /* Dump to debug output */ void rdump(void *); /* Dump to debug output */
size_t rmemsize(void *res); /* Return size of memory used by the resource */ size_t rmemsize(void *res); /* Return size of memory used by the resource */

24
lib/socket.h
View File

@ -12,6 +12,24 @@
#include <errno.h> #include <errno.h>
#include "lib/resource.h" #include "lib/resource.h"
#include "lib/libssh.h"
struct ssh_sock {
const char *username; /* (Required) SSH user name */
const char *server_hostkey_path; /* (Optional) Filepath to the SSH public key of remote side, can be knownhost file */
const char *client_privkey_path; /* (Optional) Filepath to the SSH private key of BIRD */
const char *subsystem; /* (Optional) Name of SSH subsytem */
ssh_session session; /* Internal */
ssh_channel channel; /* Internal */
int state; /* Internal */
#define SK_SSH_CONNECT 0 /* Start state */
#define SK_SSH_SERVER_KNOWN 1 /* Internal */
#define SK_SSH_USERAUTH 2 /* Internal */
#define SK_SSH_CHANNEL 3 /* Internal */
#define SK_SSH_SESSION 4 /* Internal */
#define SK_SSH_SUBSYSTEM 5 /* Internal */
#define SK_SSH_ESTABLISHED 6 /* Final state */
};
typedef struct birdsock { typedef struct birdsock {
resource r; resource r;
@ -19,6 +37,7 @@ typedef struct birdsock {
int type; /* Socket type */ int type; /* Socket type */
void *data; /* User data */ void *data; /* User data */
ip_addr saddr, daddr; /* IPA_NONE = unspecified */ ip_addr saddr, daddr; /* IPA_NONE = unspecified */
const char *host; /* Alternative to daddr, NULL = unspecified */
uint sport, dport; /* 0 = unspecified (for IP: protocol type) */ uint sport, dport; /* 0 = unspecified (for IP: protocol type) */
int tos; /* TOS / traffic class, -1 = default */ int tos; /* TOS / traffic class, -1 = default */
int priority; /* Local socket priority, -1 = default */ int priority; /* Local socket priority, -1 = default */
@ -51,7 +70,8 @@ typedef struct birdsock {
node n; node n;
void *rbuf_alloc, *tbuf_alloc; void *rbuf_alloc, *tbuf_alloc;
char *password; /* Password for MD5 authentication */ char *password; /* Password for MD5 authentication */
char *err; /* Error message */ const char *err; /* Error message */
struct ssh_sock *ssh; /* Used in SK_SSH */
} sock; } sock;
sock *sock_new(pool *); /* Allocate new socket */ sock *sock_new(pool *); /* Allocate new socket */
@ -115,6 +135,8 @@ extern int sk_priority_control; /* Suggested priority for control traffic, shou
#define SK_MAGIC 7 /* Internal use by sysdep code */ #define SK_MAGIC 7 /* Internal use by sysdep code */
#define SK_UNIX_PASSIVE 8 #define SK_UNIX_PASSIVE 8
#define SK_UNIX 9 #define SK_UNIX 9
#define SK_SSH_ACTIVE 10 /* - - * * - ? - DA = host */
#define SK_SSH 11
/* Socket families */ /* Socket families */

13
nest/proto.c
View File

@ -39,12 +39,10 @@ static int graceful_restart_state;
static u32 graceful_restart_locks; static u32 graceful_restart_locks;
static char *p_states[] = { "DOWN", "START", "UP", "STOP" }; static char *p_states[] = { "DOWN", "START", "UP", "STOP" };
static char *cs_states[] = {
[CS_DOWN] = "DOWN", #if defined(LOCAL_DEBUG) || defined(GLOBAL_DEBUG)
[CS_START] = "START", static char *cs_states[] = { "DOWN", "START", "UP", "FLUSHING" };
[CS_UP] = "UP", #endif
[CS_FLUSHING] = "FLUSHING"
};
extern struct protocol proto_unix_iface; extern struct protocol proto_unix_iface;
@ -1263,6 +1261,9 @@ protos_build(void)
proto_build(&proto_bfd); proto_build(&proto_bfd);
bfd_init_all(); bfd_init_all();
#endif #endif
#ifdef CONFIG_RPKI
proto_build(&proto_rpki);
#endif
proto_pool = rp_new(&root_pool, "Protocols"); proto_pool = rp_new(&root_pool, "Protocols");
proto_shutdown_timer = tm_new(proto_pool); proto_shutdown_timer = tm_new(proto_pool);

6
nest/protocol.h
View File

@ -81,7 +81,7 @@ void protos_dump_all(void);
extern struct protocol extern struct protocol
proto_device, proto_radv, proto_rip, proto_static, proto_device, proto_radv, proto_rip, proto_static,
proto_ospf, proto_pipe, proto_bgp, proto_bfd; proto_ospf, proto_pipe, proto_bgp, proto_bfd, proto_rpki;
/* /*
* Routing Protocol Instance * Routing Protocol Instance
@ -271,7 +271,7 @@ proto_get_router_id(struct proto_config *pc)
} }
/* Moved from route.h to avoid dependency conflicts */ /* Moved from route.h to avoid dependency conflicts */
static inline void rte_update(struct proto *p, net_addr *n, rte *new) { rte_update2(p->main_channel, n, new, p->main_source); } static inline void rte_update(struct proto *p, const net_addr *n, rte *new) { rte_update2(p->main_channel, n, new, p->main_source); }
extern list proto_list; extern list proto_list;
@ -562,11 +562,9 @@ int proto_configure_channel(struct proto *p, struct channel **c, struct channel_
void channel_set_state(struct channel *c, uint state); void channel_set_state(struct channel *c, uint state);
/*
static inline void channel_init(struct channel *c) { channel_set_state(c, CS_START); } static inline void channel_init(struct channel *c) { channel_set_state(c, CS_START); }
static inline void channel_open(struct channel *c) { channel_set_state(c, CS_UP); } static inline void channel_open(struct channel *c) { channel_set_state(c, CS_UP); }
static inline void channel_close(struct channel *c) { channel_set_state(c, CS_FLUSHING); } static inline void channel_close(struct channel *c) { channel_set_state(c, CS_FLUSHING); }
*/
void channel_request_feeding(struct channel *c); void channel_request_feeding(struct channel *c);
void *channel_config_new(const struct channel_class *cc, uint net_type, struct proto_config *proto); void *channel_config_new(const struct channel_class *cc, uint net_type, struct proto_config *proto);

4
nest/route.h
View File

@ -276,7 +276,7 @@ static inline net *net_get(rtable *tab, const net_addr *addr) { return (net *) f
rte *rte_find(net *net, struct rte_src *src); rte *rte_find(net *net, struct rte_src *src);
rte *rte_get_temp(struct rta *); rte *rte_get_temp(struct rta *);
void rte_update2(struct channel *c, net_addr *n, rte *new, struct rte_src *src); void rte_update2(struct channel *c, const net_addr *n, rte *new, struct rte_src *src);
/* rte_update() moved to protocol.h to avoid dependency conflicts */ /* rte_update() moved to protocol.h to avoid dependency conflicts */
void rte_discard(rtable *tab, rte *old); void rte_discard(rtable *tab, rte *old);
int rt_examine(rtable *t, net_addr *a, struct proto *p, struct filter *filter); int rt_examine(rtable *t, net_addr *a, struct proto *p, struct filter *filter);
@ -376,6 +376,7 @@ typedef struct rta {
#define RTS_OSPF_EXT2 10 /* OSPF external route type 2 */ #define RTS_OSPF_EXT2 10 /* OSPF external route type 2 */
#define RTS_BGP 11 /* BGP route */ #define RTS_BGP 11 /* BGP route */
#define RTS_PIPE 12 /* Inter-table wormhole */ #define RTS_PIPE 12 /* Inter-table wormhole */
#define RTS_RPKI 13 /* Route Origin Authorization */
#define RTC_UNICAST 0 #define RTC_UNICAST 0
#define RTC_BROADCAST 1 #define RTC_BROADCAST 1
@ -551,6 +552,7 @@ extern struct protocol *attr_class_to_protocol[EAP_MAX];
#define DEF_PREF_OSPF 150 /* OSPF intra-area, inter-area and type 1 external routes */ #define DEF_PREF_OSPF 150 /* OSPF intra-area, inter-area and type 1 external routes */
#define DEF_PREF_RIP 120 /* RIP */ #define DEF_PREF_RIP 120 /* RIP */
#define DEF_PREF_BGP 100 /* BGP */ #define DEF_PREF_BGP 100 /* BGP */
#define DEF_PREF_RPKI 80 /* RPKI */
#define DEF_PREF_INHERITED 10 /* Routes inherited from other routing daemons */ #define DEF_PREF_INHERITED 10 /* Routes inherited from other routing daemons */
/* /*

2
nest/rt-table.c
View File

@ -1267,7 +1267,7 @@ rte_unhide_dummy_routes(net *net, rte **dummy)
*/ */
void void
rte_update2(struct channel *c, net_addr *n, rte *new, struct rte_src *src) rte_update2(struct channel *c, const net_addr *n, rte *new, struct rte_src *src)
{ {
struct proto *p = c->proto; struct proto *p = c->proto;
struct proto_stats *stats = &c->stats; struct proto_stats *stats = &c->stats;

3
proto/Doc
View File

@ -3,7 +3,8 @@ C bfd
C bgp C bgp
C ospf C ospf
C pipe C pipe
C rip
C radv C radv
C rip
C rpki
C static C static
S ../nest/rt-dev.c S ../nest/rt-dev.c

5
proto/rpki/Doc Normal file
View File

@ -0,0 +1,5 @@
S rpki.c
S packets.c
S transport.c
S tcp_transport.c
S ssh_transport.c

4
proto/rpki/Makefile Normal file
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@ -0,0 +1,4 @@
src := rpki.c packets.c tcp_transport.c ssh_transport.c transport.c
obj := $(src-o-files)
$(all-daemon)
$(cf-local)

118
proto/rpki/config.Y Normal file
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@ -0,0 +1,118 @@
/*
* BIRD -- The Resource Public Key Infrastructure (RPKI) to Router Protocol
*
* (c) 2015 CZ.NIC
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
CF_HDR
#include "proto/rpki/rpki.h"
CF_DEFINES
#define RPKI_CFG ((struct rpki_config *) this_proto)
static void
rpki_check_unused_hostname(void)
{
if (RPKI_CFG->hostname != NULL)
cf_error("Only one remote cache server per protocol allowed");
}
CF_DECLS
CF_KEYWORDS(RPKI, REMOTE, BIRD, PRIVATE, PUBLIC, KEY, SSH, ENCRYPTION, USER,
RETRY, REFRESH, EXPIRE)
CF_GRAMMAR
CF_ADDTO(proto, rpki_proto)
rpki_proto_start: proto_start RPKI {
this_proto = proto_config_new(&proto_rpki, $1);
RPKI_CFG->retry_interval = RPKI_DEFAULT_RETRY_INTERVAL;
RPKI_CFG->refresh_interval = RPKI_DEFAULT_REFRESH_INTERVAL;
RPKI_CFG->expire_interval = RPKI_DEFAULT_EXPIRE_INTERVAL;
};
rpki_proto: rpki_proto_start proto_name '{' rpki_proto_opts '}' { rpki_check_config(RPKI_CFG); };
rpki_proto_opts:
/* empty */
| rpki_proto_opts rpki_proto_item ';'
;
rpki_proto_item:
proto_item
| proto_channel
| REMOTE rpki_cache_addr
| REMOTE rpki_cache_addr rpki_proto_item_port
| rpki_proto_item_port
| SSH ENCRYPTION rpki_transport_ssh
| REFRESH expr {
if (rpki_check_refresh_interval($2))
cf_error(rpki_check_refresh_interval($2));
RPKI_CFG->refresh_interval = $2;
}
| RETRY expr {
if (rpki_check_retry_interval($2))
cf_error(rpki_check_retry_interval($2));
RPKI_CFG->retry_interval = $2;
}
| EXPIRE expr {
if (rpki_check_expire_interval($2))
cf_error(rpki_check_expire_interval($2));
RPKI_CFG->expire_interval = $2;
}
;
rpki_transport_ssh:
OFF { RPKI_CFG->ssh = NULL; }
| rpki_transport_ssh_init '{' rpki_transport_ssh_opts '}' rpki_transport_ssh_check
;
rpki_proto_item_port: PORT expr { check_u16($2); RPKI_CFG->port = $2; };
rpki_cache_addr:
text {
rpki_check_unused_hostname();
RPKI_CFG->hostname = $1;
}
| ipa {
rpki_check_unused_hostname();
RPKI_CFG->ip = $1;
char *hostname = cfg_allocz(sizeof(INET6_ADDRSTRLEN+1));
bsnprintf(hostname, INET6_ADDRSTRLEN+1, "%I", RPKI_CFG->ip);
RPKI_CFG->hostname = hostname;
}
;
rpki_transport_ssh_init:
{
/* allow extending ssh configuration */
if (RPKI_CFG->ssh == NULL)
RPKI_CFG->ssh = cfg_allocz(sizeof(struct rpki_config_ssh));
};
rpki_transport_ssh_opts:
/* empty */
| rpki_transport_ssh_opts rpki_transport_ssh_item ';'
;
rpki_transport_ssh_item:
BIRD PRIVATE KEY text { RPKI_CFG->ssh->bird_private_key = $4; }
| REMOTE PUBLIC KEY text { RPKI_CFG->ssh->cache_public_key = $4; }
| USER text { RPKI_CFG->ssh->user = $2; }
;
rpki_transport_ssh_check:
{
if (RPKI_CFG->ssh->user == NULL)
cf_error("User must be set");
};
CF_CODE
CF_END

1043
proto/rpki/packets.c Normal file
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File diff suppressed because it is too large Load Diff

37
proto/rpki/packets.h Normal file
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@ -0,0 +1,37 @@
/*
* BIRD -- The Resource Public Key Infrastructure (RPKI) to Router Protocol
*
* (c) 2015 CZ.NIC
*
* This file was a part of RTRlib: http://rpki.realmv6.org/
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_RPKI_PACKETS_H_
#define _BIRD_RPKI_PACKETS_H_
#include <arpa/inet.h>
#define RPKI_RX_BUFFER_SIZE 65536
#define RPKI_TX_BUFFER_SIZE 65536
#define RPKI_PDU_HEADER_LEN 8
/* Error PDU size is the biggest (has encapsulate PDU inside):
* Header size 8 Bytes +
* Length of Encapsulated PDU 4 Bytes +
* Encapsulated PDU IPv6 32 Bytes +
* Length of Text 4 Bytes +
* UTF-8 Text 400*2 Bytes
* = 848 Bytes
*/
#define RPKI_PDU_MAX_LEN 848
int rpki_send_serial_query(struct rpki_cache *cache);
int rpki_send_reset_query(struct rpki_cache *cache);
int rpki_rx_hook(sock *sk, int size);
void rpki_connected_hook(sock *sk);
void rpki_err_hook(sock *sk, int size);
void rpki_table_remove_all(struct rpki_cache *cache);
#endif

737
proto/rpki/rpki.c Normal file
View File

@ -0,0 +1,737 @@
/*
* BIRD -- The Resource Public Key Infrastructure (RPKI) to Router Protocol
*
* (c) 2015 CZ.NIC
*
* Using RTRlib: http://rpki.realmv6.org/
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
/**
* DOC: RPKI to Router Protocol
*
* The Resource Public Key Infrastructure (RPKI) to Router Protocol (RFC 6810)
* is protocol for communication between router (BIRD) and RPKI cache server
* (RPKI validator). Validator sends implementation
* is based on the RTRlib (http://rpki.realmv6.org/). The BIRD takes over
* |packets.c|, |rtr.c| (inside |rpki.c|), |transport.c|, |tcp_transport.c| and |ssh_transport.c| files
* from RTRlib.
*
* A SSH transport requires LibSSH library. LibSSH is loading dynamically using dlopen
* function.
*/
/*
* TODO list
* - Receive Router Key PDU with End-Entity certificate
* https://tools.ietf.org/html/draft-ietf-sidr-rpki-rtr-rfc6810-bis-07#section-5.10
* It's implemented in RTRlib.
* - Saving EE Certificate
*/
#include <stdlib.h>
#include <netdb.h>
#undef LOCAL_DEBUG
#include "rpki.h"
#include "lib/string.h"
#include "nest/cli.h"
static const char *str_cache_states[] = {
[RPKI_CS_CONNECTING] = "CONNECTING",
[RPKI_CS_ESTABLISHED] = "ESTABLISHED",
[RPKI_CS_RESET] = "RESET",
[RPKI_CS_SYNC] = "SYNC",
[RPKI_CS_FAST_RECONNECT] = "FAST_RECONNECT",
[RPKI_CS_ERROR_NO_DATA_AVAIL] = "ERROR_NO_DATA_AVAIL",
[RPKI_CS_ERROR_NO_INCR_UPDATE_AVAIL] = "ERROR_NO_INCR_UPDATE_AVAIL",
[RPKI_CS_ERROR_FATAL] = "ERROR_FATAL",
[RPKI_CS_ERROR_TRANSPORT] = "ERROR_TRANSPORT",
[RPKI_CS_SHUTDOWN] = "SHUTDOWN"
};
const char *
rpki_cache_state_to_str(enum rpki_cache_state state)
{
return str_cache_states[state];
}
/* Return 0 if non-valid transition,
* return 1 if valid transition */
static int
rpki_is_allowed_transition_cache_state(const enum rpki_cache_state old, const enum rpki_cache_state new)
{
switch (new)
{
case RPKI_CS_CONNECTING: return old == RPKI_CS_SHUTDOWN || old == RPKI_CS_ERROR_TRANSPORT || old == RPKI_CS_FAST_RECONNECT;
case RPKI_CS_ESTABLISHED: return old == RPKI_CS_SYNC;
case RPKI_CS_RESET: return old == RPKI_CS_ERROR_NO_DATA_AVAIL || old == RPKI_CS_ERROR_NO_INCR_UPDATE_AVAIL;
case RPKI_CS_SYNC: return old == RPKI_CS_RESET || old == RPKI_CS_CONNECTING || old == RPKI_CS_ESTABLISHED;
case RPKI_CS_FAST_RECONNECT: return old == RPKI_CS_ESTABLISHED || old == RPKI_CS_SYNC;
case RPKI_CS_ERROR_NO_DATA_AVAIL: return old == RPKI_CS_SYNC;
case RPKI_CS_ERROR_NO_INCR_UPDATE_AVAIL: return old == RPKI_CS_SYNC;
case RPKI_CS_ERROR_FATAL: return 1;
case RPKI_CS_ERROR_TRANSPORT: return 1;
case RPKI_CS_SHUTDOWN: return 1;
}
return 0;
}
static struct proto *
rpki_init(struct proto_config *CF)
{
struct proto *P = proto_new(CF);
return P;
}
const char *
rpki_get_cache_ident(struct rpki_cache *cache)
{
return rpki_tr_ident(cache->tr_sock);
}
/*
* Timers
*/
void
rpki_schedule_next_refresh(struct rpki_cache *cache)
{
if (cache->state == RPKI_CS_SHUTDOWN)
{
CACHE_DBG(cache, "Stop refreshing");
return;
}
unsigned time_to_wait = cache->refresh_interval;
CACHE_DBG(cache, "Scheduling next refresh after %u seconds", time_to_wait);
tm_start(cache->refresh_timer, time_to_wait);
}
void
rpki_schedule_next_retry(struct rpki_cache *cache)
{
uint time_to_wait = cache->retry_interval;
switch (cache->state)
{
case RPKI_CS_ESTABLISHED:
case RPKI_CS_SYNC:
case RPKI_CS_RESET:
CACHE_DBG(cache, "Stop retrying connection");
break;
default:
CACHE_DBG(cache, "Scheduling next retry after %u seconds", time_to_wait);
tm_start(cache->retry_timer, time_to_wait);
}
}
void
rpki_schedule_next_expire_check(struct rpki_cache *cache)
{
/* minimum time to wait is 1 second */
unsigned time_to_wait = MAX(((int)cache->expire_interval - (int)(now - cache->last_update)), 1);
CACHE_DBG(cache, "Scheduling next expiration check after %u seconds", time_to_wait);
tm_start(cache->expire_timer, time_to_wait);
}
static void
rpki_refresh_hook(struct timer *tm)
{
struct rpki_cache *cache = tm->data;
CACHE_DBG(cache, "%s", rpki_cache_state_to_str(cache->state));
switch (cache->state)
{
case RPKI_CS_ESTABLISHED:
rpki_cache_change_state(cache, RPKI_CS_SYNC);
break;
case RPKI_CS_SYNC:
rpki_cache_change_state(cache, RPKI_CS_ERROR_TRANSPORT);
break;
default:
break;
}
rpki_schedule_next_refresh(cache);
}
static void
rpki_retry_hook(struct timer *tm)
{
struct rpki_cache *cache = tm->data;
CACHE_DBG(cache, "%s", rpki_cache_state_to_str(cache->state));
switch (cache->state)
{
case RPKI_CS_ESTABLISHED:
case RPKI_CS_CONNECTING:
case RPKI_CS_SYNC:
case RPKI_CS_SHUTDOWN:
break;
default:
rpki_cache_change_state(cache, RPKI_CS_CONNECTING);
break;
}
rpki_schedule_next_retry(cache);
}
static void
rpki_purge_records_if_outdated(struct rpki_cache *cache)
{
if (cache->last_update == 0)
return;
if ((cache->last_update + cache->expire_interval) < now)
{
CACHE_TRACE(D_EVENTS, cache, "All routes expired");
rpki_table_remove_all(cache);
cache->request_session_id = 1;
cache->serial_number = 0;
cache->last_update = 0;
}
else
{
CACHE_DBG(cache, "No outdated records, remains %d seconds to become obsolete", (int)cache->expire_interval - (int)(now - cache->last_update));
}
}
static void
rpki_expire_hook(struct timer *tm)
{
struct rpki_cache *cache = tm->data;
if (cache->last_update == 0)
return;
CACHE_DBG(cache, ""); /* Show name of function */
rpki_purge_records_if_outdated(cache);
rpki_schedule_next_expire_check(cache);
}
static int
rpki_open_connection(struct rpki_cache *cache)
{
CACHE_TRACE(D_EVENTS, cache, "Opening a connection");
if (rpki_tr_open(cache->tr_sock) == TR_ERROR)
{
rpki_cache_change_state(cache, RPKI_CS_ERROR_TRANSPORT);
return TR_ERROR;
}
return TR_SUCCESS;
}
static void
rpki_close_connection(struct rpki_cache *cache)
{
CACHE_TRACE(D_EVENTS, cache, "Closing a connection");
rpki_tr_close(cache->tr_sock);
}
/**
* rpki_cache_change_state - check and change cache state
* @cache: RPKI cache instance
* @new_state: suggested new state
*
* Validates and makes transition. Does appropriate actions after change
*/
void
rpki_cache_change_state(struct rpki_cache *cache, const enum rpki_cache_state new_state)
{
const enum rpki_cache_state old_state = cache->state;
if (old_state == new_state)
return;
if (!rpki_is_allowed_transition_cache_state(old_state, new_state))
{
CACHE_TRACE(D_EVENTS, cache, "Change state %s -> %s is not allowed", rpki_cache_state_to_str(old_state), rpki_cache_state_to_str(new_state));
ASSERT(0);
return;
}
CACHE_TRACE(D_EVENTS, cache, "Change state %s -> %s", rpki_cache_state_to_str(old_state), rpki_cache_state_to_str(new_state));
cache->state = new_state;
switch (new_state)
{
case RPKI_CS_CONNECTING:
{
sock *sk = cache->tr_sock->sk;
if (sk == NULL || sk->fd < 0)
rpki_open_connection(cache);
else
rpki_cache_change_state(cache, RPKI_CS_SYNC);
break;
}
case RPKI_CS_ESTABLISHED:
break;
case RPKI_CS_RESET:
/* Resetting RTR connection. */
cache->request_session_id = 1;
cache->serial_number = 0;
rpki_cache_change_state(cache, RPKI_CS_SYNC);
break;
case RPKI_CS_SYNC:
/* Requesting for receive validation records from the RTR server. */
if (cache->request_session_id)
{
/* Change to state RESET, if socket dont has a session_id */
if (rpki_send_reset_query(cache) != RPKI_SUCCESS)
rpki_cache_change_state(cache, RPKI_CS_ERROR_FATAL);
}
else
{
/* if we already have a session_id, send a serial query and start to sync */
if (rpki_send_serial_query(cache) != RPKI_SUCCESS)
rpki_cache_change_state(cache, RPKI_CS_ERROR_FATAL);
}
break;
case RPKI_CS_ERROR_NO_INCR_UPDATE_AVAIL:
/* Server was unable to answer the last serial or reset query. */
rpki_purge_records_if_outdated(cache);
rpki_cache_change_state(cache, RPKI_CS_RESET);
break;
case RPKI_CS_ERROR_NO_DATA_AVAIL:
/* No validation records are available on the RTR server. */
rpki_cache_change_state(cache, RPKI_CS_RESET);
break;
case RPKI_CS_ERROR_FATAL:
/* Fatal protocol error occurred. */
cache->request_session_id = 1;
cache->serial_number = 0;
cache->last_update = 0;
rpki_table_remove_all(cache);
/* Fall through */
case RPKI_CS_ERROR_TRANSPORT:
/* Error on the transport socket occurred. */
rpki_close_connection(cache);
rpki_schedule_next_retry(cache);
break;
case RPKI_CS_FAST_RECONNECT:
/* Reconnect without any waiting period */
rpki_close_connection(cache);
rpki_cache_change_state(cache, RPKI_CS_CONNECTING);
break;
case RPKI_CS_SHUTDOWN:
/* RTR Socket is stopped. */
rpki_close_connection(cache);
cache->request_session_id = 1;
cache->serial_number = 0;
cache->last_update = 0;
rpki_table_remove_all(cache);
break;
};
}
/**
* rpki_check_refresh_interval - check validity of refresh interval value
* @seconds: suggested value
*
* Validate value and return NULL if check passed or error message if check failed.
*/
const char *
rpki_check_refresh_interval(uint seconds)
{
if (seconds < 1)
return "Minimum allowed refresh interval is 1 second";
if (seconds > 86400)
return "Maximum allowed refresh interval is 86400 seconds";
return NULL;
}
/**
* rpki_check_retry_interval - check validity of retry interval value
* @seconds: suggested value
*
* Validate value and return NULL if check passed or error message if check failed.
*/
const char *
rpki_check_retry_interval(uint seconds)
{
if (seconds < 1)
return "Minimum allowed retry interval is 1 second";
if (seconds > 7200)
return "Maximum allowed retry interval is 7200 seconds";
return NULL;
}
/**
* rpki_check_expire_interval - check validity of expire interval value
* @seconds: suggested value
*
* Validate value and return NULL if check passed or error message if check failed.
*/
const char *
rpki_check_expire_interval(uint seconds)
{
if (seconds < 600)
return "Minimum allowed expire interval is 600 seconds";
if (seconds > 172800)
return "Maximum allowed expire interval is 172800 seconds";
return NULL;
}
static struct rpki_cache *
rpki_init_cache(struct rpki_proto *p, struct rpki_config *cf)
{
pool *pool = rp_new(p->p.pool, cf->hostname);
struct rpki_cache *cache = mb_allocz(pool, sizeof(struct rpki_cache));
cache->pool = pool;
cache->p = p;
proto_configure_channel(&p->p, &cache->roa4_channel, proto_cf_find_channel(p->p.cf, NET_ROA4));
proto_configure_channel(&p->p, &cache->roa6_channel, proto_cf_find_channel(p->p.cf, NET_ROA6));
cache->state = RPKI_CS_SHUTDOWN;
cache->request_session_id = 1;
cache->serial_number = 0;
cache->last_update = 0;
cache->version = RPKI_MAX_VERSION;
cache->refresh_interval = cf->refresh_interval;
cache->retry_interval = cf->retry_interval;
cache->expire_interval = cf->expire_interval;
cache->retry_timer = tm_new_set(pool, &rpki_retry_hook, cache, 0, 0);
cache->refresh_timer = tm_new_set(pool, &rpki_refresh_hook, cache, 0, 0);
cache->expire_timer = tm_new_set(pool, &rpki_expire_hook, cache, 0, 0);
cache->tr_sock = mb_allocz(pool, sizeof(struct rpki_tr_sock));
cache->tr_sock->cache = cache;
if (cf->ssh)
rpki_tr_ssh_init(cache->tr_sock);
else
rpki_tr_tcp_init(cache->tr_sock);
CACHE_TRACE(D_EVENTS, cache, "Created");
return cache;
}
static void
rpki_free_cache(struct rpki_cache *cache)
{
struct rpki_proto *p = cache->p;
rpki_table_remove_all(cache);
CACHE_TRACE(D_EVENTS, p->cache, "Destroyed");
rfree(cache->pool);
p->cache = NULL;
}
static int
rpki_shutdown(struct proto *P)
{
struct rpki_proto *p = (void *) P;
p->cache = NULL;
/* protocol memory pool will be automatically freed */
return PS_DOWN;
}
static void
rpki_start_cache(struct rpki_cache *cache)
{
rpki_cache_change_state(cache, RPKI_CS_CONNECTING);
}
static void
rpki_replace_cache(struct rpki_cache *cache, struct rpki_config *new, struct rpki_config *old)
{
struct rpki_proto *p = cache->p;
rpki_free_cache(cache);
p->cache = rpki_init_cache(p, new);
rpki_start_cache(p->cache);
}
static void
rpki_fast_reconnect_cache(struct rpki_cache *cache, struct rpki_config *new, struct rpki_config *old)
{
if (cache->state == RPKI_CS_ESTABLISHED)
rpki_cache_change_state(cache, RPKI_CS_FAST_RECONNECT);
else
rpki_replace_cache(cache, old, new);
}
/*
* Return 0 if need to restart
* Return 1 if reconfiguration finished successful
*/
static int
rpki_reconfigure_cache(struct rpki_proto *p, struct rpki_cache *cache, struct rpki_config *new, struct rpki_config *old)
{
u8 try_fast_reconnect = 0;
if (!proto_configure_channel(&p->p, &cache->roa4_channel, proto_cf_find_channel(p->p.cf, NET_ROA4)) ||
!proto_configure_channel(&p->p, &cache->roa6_channel, proto_cf_find_channel(p->p.cf, NET_ROA6)))
{
CACHE_TRACE(D_EVENTS, cache, "Channels changed");
return 0;
}
if (strcmp(old->hostname, new->hostname) != 0)
{
CACHE_TRACE(D_EVENTS, cache, "Remote cache server address changed to %s", new->hostname);
goto hard_cache_replace;
}
if (old->port != new->port)
{
CACHE_TRACE(D_EVENTS, cache, "Remote cache server port changed to %u", new->port);
goto hard_cache_replace;
}
if (!!old->ssh != !!new->ssh)
{
CACHE_TRACE(D_EVENTS, cache, "SSH encryption toggled");
goto hard_cache_replace;
}
else if (old->ssh && new->ssh)
{
if ((strcmp(old->ssh->bird_private_key, new->ssh->bird_private_key) != 0) ||
(strcmp(old->ssh->cache_public_key, new->ssh->cache_public_key) != 0) ||
(strcmp(old->ssh->user, new->ssh->user) != 0))
{
CACHE_TRACE(D_EVENTS, cache, "Settings of SSH transport encryption changed");
try_fast_reconnect = 1;
}
}
if (cache->expire_interval != new->expire_interval)
{
cache->expire_interval = new->expire_interval;
CACHE_TRACE(D_EVENTS, cache, "Expire interval changed to %u seconds", cache->expire_interval);
try_fast_reconnect = 1;
}
if (cache->refresh_interval != new->refresh_interval)
{
cache->refresh_interval = new->refresh_interval;
CACHE_TRACE(D_EVENTS, cache, "Refresh interval changed to %u seconds", cache->refresh_interval);
try_fast_reconnect = 1;
}
if (cache->retry_interval != new->retry_interval)
{
cache->retry_interval = new->retry_interval;
CACHE_TRACE(D_EVENTS, cache, "Retry interval changed to %u seconds", cache->retry_interval);
try_fast_reconnect = 1;
}
if (try_fast_reconnect)
rpki_fast_reconnect_cache(cache, new, old);
return 1;
hard_cache_replace:
rpki_replace_cache(cache, new, old);
return 1;
}
/*
* Return 0 if need to restart
* Return 1 if reconfiguration finished successful
*/
static int
rpki_reconfigure_proto(struct rpki_proto *p, struct rpki_config *new_cf, struct rpki_config *old_cf)
{
u8 new = new_cf && new_cf->hostname;
u8 old = old_cf && old_cf->hostname;
struct rpki_cache *cache = p->cache;
if (new && !old)
{
p->cache = rpki_init_cache(p, new_cf);
rpki_start_cache(p->cache);
}
else if (!new && old && cache)
rpki_free_cache(cache);
else if (new && old && cache)
return rpki_reconfigure_cache(p, cache, new_cf, old_cf);
return 1;
}
/*
* Return 0 if need to restart
* Return 1 if reconfiguration finished successful
*/
static int
rpki_reconfigure(struct proto *P, struct proto_config *CF)
{
struct rpki_proto *p = (void *) P;
struct rpki_config *new = (void *) CF;
struct rpki_config *old = (void *) p->p.cf;
P->cf = CF;
if (rpki_reconfigure_proto(p, new, old))
return 1;
P->cf = (void *) old;
return 0;
}
static void
rpki_get_status(struct proto *P, byte *buf)
{
struct rpki_proto *p = (struct rpki_proto *) P;
if (P->proto_state == PS_DOWN)
{
*buf = 0;
return;
}
if (p->cache)
bsprintf(buf, "%s", rpki_cache_state_to_str(p->cache->state));
else
bsprintf(buf, "No cache server configured");
}
static void
rpki_show_proto_info_timer(const char *name, uint num, timer *t)
{
if (t->expires)
cli_msg(-1006, " %-17s %us (remains %us)", name, num, tm_remains(t));
else
cli_msg(-1006, " %-17s %us", name, num);
}
static void
rpki_show_proto_info(struct proto *P)
{
struct rpki_proto *p = (struct rpki_proto *) P;
struct rpki_config *cf = (void *) p->p.cf;
struct rpki_cache *cache = p->cache;
if (cache)
{
cli_msg(-1006, " Remote server: %s", rpki_get_cache_ident(cache));
cli_msg(-1006, " Status: %s", rpki_cache_state_to_str(cache->state));
cli_msg(-1006, " Transport: %s", cf->ssh ? "SSHv2" : "Unprotected over TCP");
cli_msg(-1006, " Protocol version: %u", cache->version);
if (cache->last_update)
cli_msg(-1006, " Last update: before %us", now - cache->last_update);
else
cli_msg(-1006, " Last update: ---");
rpki_show_proto_info_timer("Retry interval:", cache->retry_interval, cache->retry_timer);
rpki_show_proto_info_timer("Refresh interval:", cache->refresh_interval, cache->refresh_timer);
rpki_show_proto_info_timer("Expire interval:", cache->expire_interval, cache->expire_timer);
if (cache->roa4_channel)
channel_show_info(cache->roa4_channel);
else
cli_msg(-1006, " No roa4 channel");
if (cache->roa6_channel)
channel_show_info(cache->roa6_channel);
else
cli_msg(-1006, " No roa6 channel");
}
}
static int
rpki_start(struct proto *P)
{
struct rpki_proto *p = (void *) P;
struct rpki_config *cf = (void *) P->cf;
rpki_reconfigure_proto(p, cf, NULL);
return PS_UP;
}
static void
rpki_postconfig(struct proto_config *CF)
{
/* Define default channel */
if (EMPTY_LIST(CF->channels))
channel_config_new(NULL, CF->net_type, CF);
}
static void
rpki_copy_config(struct proto_config *dest, struct proto_config *src)
{
struct rpki_config *d = (void *) dest;
struct rpki_config *s = (void *) src;
/*
* Make a deep copy.
* The SSH configuration block can be reopened and extended.
*/
if (s->ssh)
{
d->ssh = cfg_alloc(sizeof(struct rpki_config_ssh));
memcpy(d->ssh, s->ssh, sizeof(struct rpki_config_ssh));
}
}
void
rpki_check_config(struct rpki_config *cf)
{
/* Do not check templates at all */
if (cf->c.class == SYM_TEMPLATE)
return;
if (cf->hostname == NULL)
cf_error("Address or hostname of remote cache server must be set");
if (cf->port == 0)
{
if (cf->ssh != NULL)
cf->port = RPKI_SSH_PORT;
else
cf->port = RPKI_PORT;
}
}
struct protocol proto_rpki = {
.name = "RPKI",
.template = "rpki%d",
.preference = DEF_PREF_RPKI,
.proto_size = sizeof(struct rpki_proto),
.config_size = sizeof(struct rpki_config),
.init = rpki_init,
.start = rpki_start,
.postconfig = rpki_postconfig,
.channel_mask = (NB_ROA4 | NB_ROA6),
.show_proto_info = rpki_show_proto_info,
.shutdown = rpki_shutdown,
.copy_config = rpki_copy_config,
.reconfigure = rpki_reconfigure,
.get_status = rpki_get_status,
};

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proto/rpki/rpki.h Normal file
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/*
* BIRD -- The Resource Public Key Infrastructure (RPKI) to Router Protocol
*
* (c) 2015 CZ.NIC
*
* Using RTRlib: http://rpki.realmv6.org/
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_RPKI_H_
#define _BIRD_RPKI_H_
#include "nest/bird.h"
#include "nest/route.h"
#include "nest/protocol.h"
#include "lib/socket.h"
#include "lib/ip.h"
#include "ssh_transport.h"
#include "tcp_transport.h"
#include "packets.h"
#define RPKI_PORT 323
#define RPKI_SSH_PORT 22
#define RPKI_DEFAULT_RETRY_INTERVAL 600
#define RPKI_DEFAULT_REFRESH_INTERVAL 3600
#define RPKI_DEFAULT_EXPIRE_INTERVAL 7200
#define RPKI_VERSION_0 0
#define RPKI_VERSION_1 1
#define RPKI_MIN_VERSION 0
#define RPKI_MAX_VERSION 1
/*
* Used in parsing of configuration file
*/
struct rpki_config_ssh {
const char *bird_private_key; /* Filepath to the BIRD server private key */
const char *cache_public_key; /* Filepath to the public key of cache server, can be file known_hosts */
const char *user; /* Username for SSH connection */
};
/*
* Cache server
*/
enum rpki_cache_state {
RPKI_CS_CONNECTING, /* Socket is establishing the transport connection. */
RPKI_CS_ESTABLISHED, /* Connection is established, socket is waiting for a Serial Notify or expiration of the refresh_interval timer */
RPKI_CS_RESET, /* Resetting RTR connection. */
RPKI_CS_SYNC, /* Receiving validation records from the RTR server. */
RPKI_CS_FAST_RECONNECT, /* Reconnect without any waiting period */
RPKI_CS_ERROR_NO_DATA_AVAIL, /* No validation records are available on the RTR server. */
RPKI_CS_ERROR_NO_INCR_UPDATE_AVAIL, /* Server was unable to answer the last serial or reset query. */
RPKI_CS_ERROR_FATAL, /* Fatal protocol error occurred. */
RPKI_CS_ERROR_TRANSPORT, /* Error on the transport socket occurred. */
RPKI_CS_SHUTDOWN, /* RTR Socket is stopped. */
};
/* return values */
enum rpki_rtvals {
RPKI_SUCCESS = 0,
RPKI_ERROR = -1
};
struct rpki_cache {
pool *pool; /* Pool containing cache objects */
struct rpki_proto *p;
struct channel *roa4_channel;
struct channel *roa6_channel;
u8 refresh_channels; /* For non-incremental updates using rt_refresh_begin(), rt_refresh_end() */
struct rpki_tr_sock *tr_sock; /* Transport specific socket */
enum rpki_cache_state state; /* RPKI_CS_* */
u32 session_id;
u8 request_session_id; /* 1 => have to request new session id; 0 => we have already session id */
u32 serial_number;
uint version; /* Protocol version */
bird_clock_t last_update; /* Last successful synchronization with cache server */
/* Intervals can be changed by remote cache server on the fly */
uint refresh_interval;
uint expire_interval;
uint retry_interval;
timer *retry_timer;
timer *refresh_timer;
timer *expire_timer;
};
/*
* Rest of RPKI
*/
struct rpki_config {
struct proto_config c;
const char *hostname; /* Full domain name of remote cache server */
ip_addr ip; /* IP address of cache server or IPA_NONE */
u16 port; /* Port of cache server */
uint refresh_interval; /* Time interval (in seconds) for refreshing ROA from server */
uint expire_interval; /* Time interval (in seconds) */
uint retry_interval; /* Time interval (in seconds) for an unreachable server */
struct rpki_config_ssh *ssh; /* SSH configuration or NULL */
};
struct rpki_proto {
struct proto p;
struct rpki_cache *cache;
};
const char *rpki_get_cache_ident(struct rpki_cache *cache);
void rpki_check_config(struct rpki_config *cf);
const char *rpki_check_refresh_interval(uint seconds);
const char *rpki_check_retry_interval(uint seconds);
const char *rpki_check_expire_interval(uint seconds);
void rpki_schedule_next_refresh(struct rpki_cache *cache);
void rpki_schedule_next_retry(struct rpki_cache *cache);
void rpki_schedule_next_expire_check(struct rpki_cache *cache);
void rpki_cache_change_state(struct rpki_cache *cache, const enum rpki_cache_state new_state);
/*
* Debug/log outputs
*/
#define RPKI_LOG(log_level, rpki, msg, args...) \
do { \
log(log_level "%s: " msg, (rpki)->p.name , ## args); \
} while(0)
#if defined(LOCAL_DEBUG) || defined(GLOBAL_DEBUG)
#define CACHE_DBG(cache,msg,args...) \
do { \
RPKI_LOG(L_DEBUG, (cache)->p, "%s: %s: " msg, rpki_get_cache_ident(cache), __func__, ## args); \
} while(0)
#else
#define CACHE_DBG(cache,msg,args...) do { } while(0)
#endif
#define RPKI_TRACE(level,rpki,msg,args...) \
do { \
if ((rpki)->p.debug & level) \
RPKI_LOG(L_TRACE, rpki, msg, ## args); \
} while(0)
#define CACHE_TRACE(level,cache,msg,args...) \
do { \
if ((cache)->p->p.debug & level) \
RPKI_LOG(L_TRACE, (cache)->p, "%s: " msg, rpki_get_cache_ident(cache), ## args); \
} while(0)
#define RPKI_WARN(p, msg, args...) RPKI_LOG(L_WARN, p, msg, ## args);
#endif /* _BIRD_RPKI_H_ */

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proto/rpki/ssh_transport.c Normal file
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/*
* BIRD -- An implementation of the SSH protocol for the RPKI transport
*
* (c) 2015 CZ.NIC
*
* This file was a part of RTRlib: http://rpki.realmv6.org/
* This transport implementation uses libssh (http://www.libssh.org/)
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include "rpki.h"
#include "ssh_transport.h"
#include "lib/libssh.h"
static int
rpki_tr_ssh_open(struct rpki_tr_sock *tr)
{
struct rpki_cache *cache = tr->cache;
struct rpki_config *cf = (void *) cache->p->p.cf;
sock *sk = tr->sk;
const char *err_msg;
if ((err_msg = load_libssh()) != NULL)
{
CACHE_TRACE(D_EVENTS, cache, "%s", err_msg);
return TR_ERROR;
}
sk->type = SK_SSH_ACTIVE;
sk->ssh = mb_allocz(sk->pool, sizeof(struct ssh_sock));
sk->ssh->username = cf->ssh->user;
sk->ssh->client_privkey_path = cf->ssh->bird_private_key;
sk->ssh->server_hostkey_path = cf->ssh->cache_public_key;
sk->ssh->subsystem = "rpki-rtr";
sk->ssh->state = SK_SSH_CONNECT;
if (sk_open(sk) != 0)
return TR_ERROR;
return TR_SUCCESS;
}
static void
rpki_tr_ssh_close(struct rpki_tr_sock *tr)
{
struct rpki_tr_ssh *ssh = tr->data;
if (ssh && ssh->ident != NULL)
{
mb_free((char *) ssh->ident);
ssh->ident = NULL;
}
/* tr->sk is closed in tr_close() */
}
static const char *
rpki_tr_ssh_ident(struct rpki_tr_sock *tr)
{
ASSERT(tr != NULL);
struct rpki_cache *cache = tr->cache;
struct rpki_config *cf = (void *) cache->p->p.cf;
struct rpki_tr_ssh *ssh = tr->data;
if (ssh->ident != NULL)
return ssh->ident;
const char *username = cf->ssh->user;
const char *host = cf->hostname;
u16 port = cf->port;
size_t len = strlen(username) + 1 + strlen(host) + 1 + 5 + 1; /* <user> + '@' + <host> + ':' + <port> + '\0' */
char *ident = mb_alloc(cache->pool, len);
bsnprintf(ident, len, "%s@%s:%u", username, host, port);
ssh->ident = ident;
return ssh->ident;
}
/*
* Initializes the rpki_tr_sock struct for a SSH connection.
*/
void
rpki_tr_ssh_init(struct rpki_tr_sock *tr)
{
struct rpki_cache *cache = tr->cache;
tr->close_fp = &rpki_tr_ssh_close;
tr->open_fp = &rpki_tr_ssh_open;
tr->ident_fp = &rpki_tr_ssh_ident;
tr->data = mb_allocz(cache->pool, sizeof(struct rpki_tr_ssh));
}

24
proto/rpki/ssh_transport.h Normal file
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/*
* BIRD -- An implementation of the SSH protocol for the RPKI transport
*
* This transport implementation uses libssh (http://www.libssh.org/)
*
* (c) 2015 CZ.NIC
*
* This file was a part of RTRlib: http://rpki.realmv6.org/
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_RPKI_SSH_TRANSPORT_H_
#define _BIRD_RPKI_SSH_TRANSPORT_H_
#include "transport.h"
struct rpki_tr_ssh {
const char *ident;
};
void rpki_tr_ssh_init(struct rpki_tr_sock *tr);
#endif

95
proto/rpki/tcp_transport.c Normal file
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/*
* BIRD -- An implementation of the TCP protocol for the RPKI protocol transport
*
* (c) 2015 CZ.NIC
*
* This file was a part of RTRlib: http://rpki.realmv6.org/
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include "rpki.h"
#include "tcp_transport.h"
#include "sysdep/unix/unix.h"
static int
rpki_tr_tcp_open(struct rpki_tr_sock *tr)
{
sock *sk = tr->sk;
sk->type = SK_TCP_ACTIVE;
if (sk_open(sk) != 0)
return TR_ERROR;
return TR_SUCCESS;
}
static void
rpki_tr_tcp_close(struct rpki_tr_sock *tr)
{
struct rpki_tr_tcp *tcp = tr->data;
if (tcp && tcp->ident != NULL)
{
mb_free((char *) tcp->ident);
tcp->ident = NULL;
}
/* tr->sk is closed in tr_close() */
}
static const char *
rpki_tr_tcp_ident(struct rpki_tr_sock *tr)
{
ASSERT(tr != NULL);
struct rpki_cache *cache = tr->cache;
struct rpki_config *cf = (void *) cache->p->p.cf;
struct rpki_tr_tcp *tcp = tr->data;
if (tcp->ident != NULL)
return tcp->ident;
const char *host = cf->hostname;
ip_addr ip = cf->ip;
u16 port = cf->port;
size_t colon_and_port_len = 6; /* max ":65535" */
size_t ident_len;
if (host)
ident_len = strlen(host) + colon_and_port_len + 1;
else
ident_len = IPA_MAX_TEXT_LENGTH + colon_and_port_len + 1;
char *ident = mb_alloc(cache->pool, ident_len);
if (host)
bsnprintf(ident, ident_len, "%s:%u", host, port);
else
bsnprintf(ident, ident_len, "%I:%u", ip, port);
tcp->ident = ident;
return tcp->ident;
}
/* Initializes the rpki_tr_sock struct for a TCP connection. */
void
rpki_tr_tcp_init(struct rpki_tr_sock *tr)
{
struct rpki_cache *cache = tr->cache;
tr->close_fp = &rpki_tr_tcp_close;
tr->open_fp = &rpki_tr_tcp_open;
tr->ident_fp = &rpki_tr_tcp_ident;
tr->data = mb_allocz(cache->pool, sizeof(struct rpki_tr_tcp));
}

22
proto/rpki/tcp_transport.h Normal file
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/*
* BIRD -- An implementation of the TCP protocol for the RPKI protocol transport
*
* (c) 2015 CZ.NIC
*
* This file was a part of RTRlib: http://rpki.realmv6.org/
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_RPKI_TCP_TRANSPORT_H_
#define _BIRD_RPKI_TCP_TRANSPORT_H_
#include "transport.h"
struct rpki_tr_tcp {
const char *ident;
};
void rpki_tr_tcp_init(struct rpki_tr_sock *tr);
#endif

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proto/rpki/transport.c Normal file
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/*
* BIRD -- The Resource Public Key Infrastructure (RPKI) to Router Protocol
*
* (c) 2015 CZ.NIC
*
* This file was a part of RTRlib: http://rpki.realmv6.org/
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <sys/socket.h>
#include <netdb.h>
#include "rpki.h"
#include "transport.h"
#include "sysdep/unix/unix.h"
/*
* Fulfill sock->af and sock->daddr if sock->daddr is empty and hostname is defined
* Return TR_SUCCESS or TR_ERROR
*/
static int
rpki_hostname_autoresolv(sock *sk)
{
if (ipa_zero(sk->daddr) && sk->host)
{
struct addrinfo *res;
struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
.ai_flags = AI_ADDRCONFIG,
};
char port[6]; /* max is "65535" + '\0' */
bsnprintf(port, sizeof(port), "%u", sk->dport);
if (getaddrinfo(sk->host, port, &hints, &res) != 0)
{
CACHE_TRACE(D_EVENTS, (struct rpki_cache *) sk->data, "getaddrinfo error, %s", gai_strerror(errno));
return TR_ERROR;
}
if (res->ai_family == AF_INET)
sk->fam = SK_FAM_IPV4;
else
sk->fam = SK_FAM_IPV6;
sockaddr sa = {
.sa = *res->ai_addr,
};
uint unused;
sockaddr_read(&sa, res->ai_family, &sk->daddr, NULL, &unused);
freeaddrinfo(res);
}
else if (ipa_zero(sk->daddr) && !sk->host)
return TR_ERROR;
else
sk->fam = ip6_is_v4mapped(sk->daddr) ? SK_FAM_IPV4 : SK_FAM_IPV6;
return TR_SUCCESS;
}
/*
* Establish the connection.
* Returns TR_SUCCESS or TR_ERROR
*/
int
rpki_tr_open(struct rpki_tr_sock *tr)
{
struct rpki_cache *cache = tr->cache;
struct rpki_config *cf = (void *) cache->p->p.cf;
ASSERT(tr->sk == NULL);
tr->sk = sk_new(cache->pool);
sock *sk = tr->sk;
sk->tx_hook = rpki_connected_hook;
sk->err_hook = rpki_err_hook;
sk->data = cache;
sk->daddr = cf->ip;
sk->dport = cf->port;
sk->host = cf->hostname;
sk->rbsize = RPKI_RX_BUFFER_SIZE;
sk->tbsize = RPKI_TX_BUFFER_SIZE;
sk->tos = IP_PREC_INTERNET_CONTROL;
sk->type = -1; /* must be set in the specific transport layer in tr_open() */
rpki_hostname_autoresolv(sk);
return tr->open_fp(tr);
}
/* Close socket and prepare it for possible next open */
inline void
rpki_tr_close(struct rpki_tr_sock *tr)
{
tr->close_fp(tr);
rfree(tr->sk);
tr->sk = NULL;
}
/* Returns a \0 terminated string identifier for the socket endpoint, eg host:port */
inline const char *
rpki_tr_ident(struct rpki_tr_sock *tr)
{
return tr->ident_fp(tr);
}

51
proto/rpki/transport.h Normal file
View File

@ -0,0 +1,51 @@
/*
* BIRD -- The Resource Public Key Infrastructure (RPKI) to Router Protocol
*
* (c) 2015 CZ.NIC
*
* This file was a part of RTRlib: http://rpki.realmv6.org/
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
/*
* The RPKI transport sockets implement the communication channel
* (e.g., SSH, TCP, TCP-AO) between an RPKI server and client.
*
* Before using the transport socket, a tr_socket must be
* initialized based on a protocol-dependent init function (e.g.,
* rpki_tr_tcp_init()).
*
* The rpki_tr_* functions call the corresponding function pointers, which are
* passed in the rpki_tr_sock struct, and forward the remaining arguments.
*/
#ifndef _BIRD_RPKI_TRANSPORT_H_
#define _BIRD_RPKI_TRANSPORT_H_
#include <time.h>
/* The return values for tr_ functions */
enum tr_rtvals {
TR_SUCCESS = 0, /* Operation was successfull */
TR_ERROR = -1, /* Error occured */
TR_WOULDBLOCK = -2, /* No data is available on the socket */
TR_INTR = -3, /* Call was interrupted from a signal */
TR_CLOSED = -4 /* Connection closed */
};
/* A transport socket datastructure */
struct rpki_tr_sock {
void *data; /* Technology specific data */
sock *sk; /* Standard BIRD socket */
struct rpki_cache *cache; /* Cache server */
int (*open_fp)(struct rpki_tr_sock *); /* Pointer to a function that establishes the socket connection */
void (*close_fp)(struct rpki_tr_sock *); /* Pointer to a function that close and frees all memory allocated with this socket */
const char *(*ident_fp)(struct rpki_tr_sock *); /* Pointer to a function that returns an identifier for the socket endpoint */
};
int rpki_tr_open(struct rpki_tr_sock *tr);
void rpki_tr_close(struct rpki_tr_sock *tr);
const char *rpki_tr_ident(struct rpki_tr_sock *tr);
#endif

1
sysdep/autoconf.h.in
View File

@ -43,6 +43,7 @@
#undef CONFIG_BGP #undef CONFIG_BGP
#undef CONFIG_OSPF #undef CONFIG_OSPF
#undef CONFIG_PIPE #undef CONFIG_PIPE
#undef CONFIG_RPKI
/* We use multithreading */ /* We use multithreading */
#undef USE_PTHREADS #undef USE_PTHREADS

359
sysdep/unix/io.c
View File

@ -36,6 +36,7 @@
#include "lib/socket.h" #include "lib/socket.h"
#include "lib/event.h" #include "lib/event.h"
#include "lib/string.h" #include "lib/string.h"
#include "lib/libssh.h"
#include "nest/iface.h" #include "nest/iface.h"
#include "sysdep/unix/unix.h" #include "sysdep/unix/unix.h"
@ -1060,26 +1061,58 @@ sk_free_bufs(sock *s)
} }
} }
static void
sk_ssh_free(sock *s)
{
struct ssh_sock *ssh = s->ssh;
if (s->ssh == NULL)
return;
s->ssh = NULL;
if (ssh->channel)
{
ssh_channel_close(ssh->channel);
ssh_channel_free(ssh->channel);
ssh->channel = NULL;
}
if (ssh->session)
{
ssh_disconnect(ssh->session);
ssh_free(ssh->session);
ssh->session = NULL;
}
}
static void static void
sk_free(resource *r) sk_free(resource *r)
{ {
sock *s = (sock *) r; sock *s = (sock *) r;
sk_free_bufs(s); sk_free_bufs(s);
if (s->fd >= 0)
if (s->type == SK_SSH || s->type == SK_SSH_ACTIVE)
sk_ssh_free(s);
if (s->fd < 0)
return;
/* FIXME: we should call sk_stop() for SKF_THREAD sockets */
if (!(s->flags & SKF_THREAD))
{ {
close(s->fd);
/* FIXME: we should call sk_stop() for SKF_THREAD sockets */
if (s->flags & SKF_THREAD)
return;
if (s == current_sock) if (s == current_sock)
current_sock = sk_next(s); current_sock = sk_next(s);
if (s == stored_sock) if (s == stored_sock)
stored_sock = sk_next(s); stored_sock = sk_next(s);
rem_node(&s->n); rem_node(&s->n);
} }
if (s->type != SK_SSH && s->type != SK_SSH_ACTIVE)
close(s->fd);
s->fd = -1;
} }
void void
@ -1181,6 +1214,9 @@ sk_setup(sock *s)
int y = 1; int y = 1;
int fd = s->fd; int fd = s->fd;
if (s->type == SK_SSH_ACTIVE)
return 0;
if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
ERR("O_NONBLOCK"); ERR("O_NONBLOCK");
@ -1293,6 +1329,14 @@ sk_tcp_connected(sock *s)
s->tx_hook(s); s->tx_hook(s);
} }
static void
sk_ssh_connected(sock *s)
{
sk_alloc_bufs(s);
s->type = SK_SSH;
s->tx_hook(s);
}
static int static int
sk_passive_connected(sock *s, int type) sk_passive_connected(sock *s, int type)
{ {
@ -1345,6 +1389,194 @@ sk_passive_connected(sock *s, int type)
return 1; return 1;
} }
/*
* Return SSH_OK or SSH_AGAIN or SSH_ERROR
*/
static int
sk_ssh_connect(sock *s)
{
s->fd = ssh_get_fd(s->ssh->session);
/* Big fall thru automata */
switch (s->ssh->state)
{
case SK_SSH_CONNECT:
{
switch (ssh_connect(s->ssh->session))
{
case SSH_AGAIN:
return SSH_AGAIN;
case SSH_OK:
break;
default:
return SSH_ERROR;
}
}
case SK_SSH_SERVER_KNOWN:
{
s->ssh->state = SK_SSH_SERVER_KNOWN;
if (s->ssh->server_hostkey_path)
{
int server_identity_is_ok = 1;
/* Check server identity */
switch (ssh_is_server_known(s->ssh->session))
{
#define LOG_WARN_ABOUT_SSH_SERVER_VALIDATION(s,msg,args...) log(L_WARN "SSH Identity %s@%s:%u: " msg, (s)->ssh->username, (s)->host, (s)->dport, ## args);
case SSH_SERVER_KNOWN_OK:
/* The server is known and has not changed. */
break;
case SSH_SERVER_NOT_KNOWN:
LOG_WARN_ABOUT_SSH_SERVER_VALIDATION(s, "The server is unknown, its public key was not found in the known host file %s", s->ssh->server_hostkey_path);
break;
case SSH_SERVER_KNOWN_CHANGED:
LOG_WARN_ABOUT_SSH_SERVER_VALIDATION(s, "The server key has changed. Either you are under attack or the administrator changed the key.");
server_identity_is_ok = 0;
break;
case SSH_SERVER_FILE_NOT_FOUND:
LOG_WARN_ABOUT_SSH_SERVER_VALIDATION(s, "The known host file %s does not exist", s->ssh->server_hostkey_path);
server_identity_is_ok = 0;
break;
case SSH_SERVER_ERROR:
LOG_WARN_ABOUT_SSH_SERVER_VALIDATION(s, "Some error happened");
server_identity_is_ok = 0;
break;
case SSH_SERVER_FOUND_OTHER:
LOG_WARN_ABOUT_SSH_SERVER_VALIDATION(s, "The server gave use a key of a type while we had an other type recorded. " \
"It is a possible attack.");
server_identity_is_ok = 0;
break;
}
if (!server_identity_is_ok)
return SSH_ERROR;
}
}
case SK_SSH_USERAUTH:
{
s->ssh->state = SK_SSH_USERAUTH;
switch (ssh_userauth_publickey_auto(s->ssh->session, NULL, NULL))
{
case SSH_AUTH_AGAIN:
return SSH_AGAIN;
case SSH_AUTH_SUCCESS:
break;
default:
return SSH_ERROR;
}
}
case SK_SSH_CHANNEL:
{
s->ssh->state = SK_SSH_CHANNEL;
s->ssh->channel = ssh_channel_new(s->ssh->session);
if (s->ssh->channel == NULL)
return SSH_ERROR;
}
case SK_SSH_SESSION:
{
s->ssh->state = SK_SSH_SESSION;
switch (ssh_channel_open_session(s->ssh->channel))
{
case SSH_AGAIN:
return SSH_AGAIN;
case SSH_OK:
break;
default:
return SSH_ERROR;
}
}
case SK_SSH_SUBSYSTEM:
{
s->ssh->state = SK_SSH_SUBSYSTEM;
if (s->ssh->subsystem)
{
switch (ssh_channel_request_subsystem(s->ssh->channel, s->ssh->subsystem))
{
case SSH_AGAIN:
return SSH_AGAIN;
case SSH_OK:
break;
default:
return SSH_ERROR;
}
}
}
case SK_SSH_ESTABLISHED:
s->ssh->state = SK_SSH_ESTABLISHED;
}
return SSH_OK;
}
/*
* Return file descriptor number if success
* Return -1 if failed
*/
static int
sk_open_ssh(sock *s)
{
if (!s->ssh)
bug("sk_open() sock->ssh is not allocated");
ssh_session sess = ssh_new();
if (sess == NULL)
ERR2("Cannot create a ssh session");
s->ssh->session = sess;
const int verbosity = SSH_LOG_NOLOG;
ssh_options_set(sess, SSH_OPTIONS_LOG_VERBOSITY, &verbosity);
ssh_options_set(sess, SSH_OPTIONS_HOST, s->host);
ssh_options_set(sess, SSH_OPTIONS_PORT, &(s->dport));
ssh_options_set(sess, SSH_OPTIONS_USER, s->ssh->username);
if (s->ssh->server_hostkey_path)
ssh_options_set(sess, SSH_OPTIONS_KNOWNHOSTS, s->ssh->server_hostkey_path);
if (s->ssh->client_privkey_path)
ssh_options_set(sess, SSH_OPTIONS_IDENTITY, s->ssh->client_privkey_path);
ssh_set_blocking(sess, 0);
switch (sk_ssh_connect(s))
{
case SSH_AGAIN:
break;
case SSH_OK:
sk_ssh_connected(s);
break;
case SSH_ERROR:
ERR2(ssh_get_error(sess));
break;
}
return ssh_get_fd(sess);
err:
return -1;
}
/** /**
* sk_open - open a socket * sk_open - open a socket
* @s: socket * @s: socket
@ -1376,6 +1608,11 @@ sk_open(sock *s)
do_bind = bind_port || ipa_nonzero(bind_addr); do_bind = bind_port || ipa_nonzero(bind_addr);
break; break;
case SK_SSH_ACTIVE:
s->ttx = ""; /* Force s->ttx != s->tpos */
fd = sk_open_ssh(s);
break;
case SK_UDP: case SK_UDP:
fd = socket(fam_to_af[s->fam], SOCK_DGRAM, IPPROTO_UDP); fd = socket(fam_to_af[s->fam], SOCK_DGRAM, IPPROTO_UDP);
bind_port = s->sport; bind_port = s->sport;
@ -1455,6 +1692,7 @@ sk_open(sock *s)
ERR2("listen"); ERR2("listen");
break; break;
case SK_SSH_ACTIVE:
case SK_MAGIC: case SK_MAGIC:
break; break;
@ -1464,6 +1702,7 @@ sk_open(sock *s)
if (!(s->flags & SKF_THREAD)) if (!(s->flags & SKF_THREAD))
sk_insert(s); sk_insert(s);
return 0; return 0;
err: err:
@ -1647,6 +1886,26 @@ sk_maybe_write(sock *s)
reset_tx_buffer(s); reset_tx_buffer(s);
return 1; return 1;
case SK_SSH:
while (s->ttx != s->tpos)
{
e = ssh_channel_write(s->ssh->channel, s->ttx, s->tpos - s->ttx);
if (e < 0)
{
s->err = ssh_get_error(s->ssh->session);
s->err_hook(s, ssh_get_error_code(s->ssh->session));
reset_tx_buffer(s);
/* EPIPE is just a connection close notification during TX */
s->err_hook(s, (errno != EPIPE) ? errno : 0);
return -1;
}
s->ttx += e;
}
reset_tx_buffer(s);
return 1;
case SK_UDP: case SK_UDP:
case SK_IP: case SK_IP:
{ {
@ -1671,6 +1930,7 @@ sk_maybe_write(sock *s)
reset_tx_buffer(s); reset_tx_buffer(s);
return 1; return 1;
} }
default: default:
bug("sk_maybe_write: unknown socket type %d", s->type); bug("sk_maybe_write: unknown socket type %d", s->type);
} }
@ -1750,6 +2010,62 @@ sk_send_full(sock *s, unsigned len, struct iface *ifa,
} }
*/ */
static void
call_rx_hook(sock *s, int size)
{
if (s->rx_hook(s, size))
{
/* We need to be careful since the socket could have been deleted by the hook */
if (current_sock == s)
s->rpos = s->rbuf;
}
}
static int
sk_read_ssh(sock *s)
{
ssh_channel rchans[2] = { s->ssh->channel, NULL };
struct timeval timev = { 1, 0 };
if (ssh_channel_select(rchans, NULL, NULL, &timev) == SSH_EINTR)
return 1; /* Try again */
if (ssh_channel_is_eof(s->ssh->channel) != 0)
{
/* The remote side is closing the connection */
s->err_hook(s, 0);
return 0;
}
if (rchans[0] == NULL)
return 0; /* No data is available on the socket */
const uint used_bytes = s->rpos - s->rbuf;
const int read_bytes = ssh_channel_read_nonblocking(s->ssh->channel, s->rpos, s->rbsize - used_bytes, 0);
if (read_bytes > 0)
{
/* Received data */
s->rpos += read_bytes;
call_rx_hook(s, used_bytes + read_bytes);
return 1;
}
else if (read_bytes == 0)
{
if (ssh_channel_is_eof(s->ssh->channel) != 0)
{
/* The remote side is closing the connection */
s->err_hook(s, 0);
}
}
else
{
s->err = ssh_get_error(s->ssh->session);
s->err_hook(s, ssh_get_error_code(s->ssh->session));
}
return 0; /* No data is available on the socket */
}
/* sk_read() and sk_write() are called from BFD's event loop */ /* sk_read() and sk_write() are called from BFD's event loop */
int int
@ -1783,17 +2099,15 @@ sk_read(sock *s, int revents)
else else
{ {
s->rpos += c; s->rpos += c;
if (s->rx_hook(s, s->rpos - s->rbuf)) call_rx_hook(s, s->rpos - s->rbuf);
{
/* We need to be careful since the socket could have been deleted by the hook */
if (current_sock == s)
s->rpos = s->rbuf;
}
return 1; return 1;
} }
return 0; return 0;
} }
case SK_SSH:
return sk_read_ssh(s);
case SK_MAGIC: case SK_MAGIC:
return s->rx_hook(s, 0); return s->rx_hook(s, 0);
@ -1832,6 +2146,25 @@ sk_write(sock *s)
return 0; return 0;
} }
case SK_SSH_ACTIVE:
{
switch (sk_ssh_connect(s))
{
case SSH_OK:
sk_ssh_connected(s);
break;
case SSH_AGAIN:
return 1;
case SSH_ERROR:
s->err = ssh_get_error(s->ssh->session);
s->err_hook(s, ssh_get_error_code(s->ssh->session));
break;
}
return 0;
}
default: default:
if (s->ttx != s->tpos && sk_maybe_write(s) > 0) if (s->ttx != s->tpos && sk_maybe_write(s) > 0)
{ {