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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 Jan Moskyto Matejka
parent 2706747f66
commit 65d2a88dd2
28 changed files with 3561 additions and 33 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@
LDFLAGS=@LDFLAGS@
LIBS=@LIBS@
DAEMON_LIBS=@DAEMON_LIBS@
CLIENT_LIBS=@CLIENT_LIBS@
CC=@CC@
M4=@M4@
@ -57,6 +58,8 @@ all: daemon cli
daemon: $(daemon)
cli: $(client)
$(daemon): LIBS += $(DAEMON_LIBS)
# Include directories
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)
# all_protocols="$proto_bfd babel bgp ospf pipe radv rip static"
all_protocols="$proto_bfd ospf pipe radv rip static"
all_protocols="$proto_bfd babel ospf pipe radv rip rpki static "
all_protocols=`echo $all_protocols | sed 's/ /,/g'`
@ -226,6 +226,10 @@ if test "$enable_debug" = yes ; then
fi
fi
DAEMON_LIBS=
AC_CHECK_LIB(dl, dlopen, DAEMON_LIBS="-ldl")
AC_SUBST(DAEMON_LIBS)
CLIENT=birdcl
CLIENT_LIBS=
if test "$enable_client" = yes ; then

182
doc/bird.sgml
View File

@ -469,7 +469,7 @@ protocol rip {
Create a new ROA (Route Origin Authorization) table. ROA tables can be
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
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
6480) or from public databases like Whois. ROA tables are examined by
<cf/roa_check()/ operator in filters.
@ -3595,7 +3595,7 @@ protocol rip [&lt;name&gt;] {
<descrip>
<tag>int <cf/rip_metric/</tag>
RIP metric of the route (ranging from 0 to <cf/infinity/). When routes
RIP metric of the route (ranging from 0 to <cf/infinity/). When routes
from different RIP instances are available and all of them have the same
preference, BIRD prefers the route with lowest <cf/rip_metric/. When a
non-RIP route is exported to RIP, the default metric is 1.
@ -3623,6 +3623,184 @@ protocol rip {
}
</code>
<sect>RPKI
<sect1>Introduction
<p>The Resource Public Key Infrastructure (RPKI) is mechanism for origin
validation of BGP routes (RFC 6480). BIRD supports only so-called RPKI-based
origin validation. There is implemented RPKI to Router (RPKI-RTR) protocol (RFC
6810). It uses some of the RPKI data to allow a router to verify 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 today, e.g. the famous
Pakastani accidental announcement of YouTube's address space.
<p>The RPKI-RTR protocol receives and maintains a set of ROAs from a cache
server (also called validator). You can validate routes (RFC 6483) using
function <cf/roa_check()/ in filter and set it as import filter at the BGP
protocol. BIRD should re-validate all of affected routes after RPKI update by
RFC 6811, but we don't support it yet! You can use a BIRD's client command
<cf>reload in <m/bgp_protocol_name/</cf> for manual call of revalidation of all
routes.
<sect1>Supported transports
<itemize>
<item>Unprotected transport over TCP uses a port 323. The cache server
and BIRD router should be on the same trusted and controlled network
for security reasons.
<item>SSHv2 encrypted transport connection uses the normal SSH port
22.
</itemize>
<sect1>Configuration
<p>We currently support just one cache server per protocol. However you can
define more RPKI protocols generally.
<code>
protocol rpki [&lt;name&gt;] {
roa4 { table &lt;tab&gt;; };
roa6 { table &lt;tab&gt;; };
remote &lt;ip&gt; | "&lt;domain&gt;" [port &lt;num&gt;];
port &lt;num&gt;;
refresh [keep] &lt;num&gt;;
retry [keep] &lt;num&gt;;
expire [keep] &lt;num&gt;;
transport tcp;
transport ssh {
bird private key "&lt;/path/to/id_rsa&gt;";
remote public key "&lt;/path/to/known_host&gt;";
user "&lt;name&gt;";
};
}
</code>
<p>Alse note that you have to specify ROA table into which will be imported
routes from a cache server. If you want to import only IPv4 prefixes you have
to specify only roa4 table. Similarly with IPv6 prefixes only. If you want to
fetch both IPv4 and even IPv6 ROAs you have to specify both types of ROA
tables.
<sect2>RPKI protocol options
<descrip>
<tag>remote <m/ip/ | "<m/hostname/" [port <m/num/]</tag> Specifies
a destination address of the cache server. Can be specified by an IP
address or by full domain name string. Only one cache can be specified
per protocol. This option is required.
<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>refresh [keep] <m/num/</tag> Time period in seconds. Tells how
long to wait before next attempting to poll the cache using a Serial
Query or a Reset Query packet. Must be lower than 86400 seconds (one
day). Too low value can caused a false positive detection of
network connection problems. A keyword <cf/keep/ suppresses updating
this value by a cache server.
Default: 3600 seconds
<tag>retry [keep] <m/num/</tag> Time period in seconds between a failed
Serial/Reset Query and a next attempt. Maximum allowed value is 7200
seconds (two hours). Too low value can caused a false positive
detection of network connection problems. A keyword <cf/keep/
suppresses updating this value by a cache server.
Default: 600 seconds
<tag>expire [keep] <m/num/</tag> Time period in seconds. Received
records are deleted if the client was unable to successfully refresh
data for this time period. Must be in range from 600 seconds (ten
minutes) to 172800 seconds (two days). A keyword <cf/keep/
suppresses updating this value by a cache server.
Default: 7200 seconds
<tag>transport tcp</tag> Unprotected transport over TCP. It's a default
transport. Should be used only on secure private networks.
Default: tcp
<tag>transport ssh { <m/SSH transport options.../ }</tag> It enables a
SSHv2 transport encryption. Cannot be combined with a TCP transport.
Default: off
</descrip>
<sect3>SSH transport options
<descrip>
<tag>bird private key "<m>/path/to/id_rsa</m>"</tag>
A path to the BIRD's private SSH key for authentication.
It can be a <cf><m>id_rsa</m></cf> file.
<tag>remote public key "<m>/path/to/known_host</m>"</tag>
A path to the cache's public SSH key for verification identity
of the cache server. It could be a path to <cf><m>known_host</m></cf> file.
<tag>user "<m/name/"</tag>
A SSH user name for authentication. This option is a required.
</descrip>
<sect1>Examples
<sect2>BGP origin validation
<p>Policy: Don't import <cf/ROA_INVALID/ routes.
<code>
roa4 table r4;
roa6 table r6;
protocol rpki {
debug all;
roa4 { table r4; };
roa6 { table r6; };
# Please, do not use rpki-validator.realmv6.org in production
remote "rpki-validator.realmv6.org" port 8282;
retry keep 5;
refresh keep 30;
expire 600;
}
filter peer_in {
if (roa_check(r4, net, bgp_path.last) = ROA_INVALID ||
roa_check(r6, net, bgp_path.last) = ROA_INVALID) then
{
print "Ignore invalid ROA ", net, " for ASN ", bgp_path.last;
reject;
}
accept;
}
protocol bgp {
debug all;
local as 65000;
neighbor 192.168.2.1 as 65001;
import filter peer_in;
}
</code>
<sect2>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;
transport ssh {
bird private key "/home/birdgeek/.ssh/id_rsa";
remote public key "/home/birdgeek/.ssh/known_hosts";
user "birdgeek";
};
# Default interval values
}
</code>
<sect>Static

11
filter/filter.c
View File

@ -1280,12 +1280,15 @@ interpret(struct f_inst *what)
if (!table)
runtime("Missing ROA table");
/* Table type is either NET_ROA4 or NET_ROA6, checked in parser */
if (v1.val.net->type != ((table->addr_type == NET_ROA4) ? NET_IP4 : NET_IP6))
runtime("Incompatible net type");
if (table->addr_type != NET_ROA4 && table->addr_type != NET_ROA6)
runtime("Table type must be either ROA4 or ROA6");
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;

6
lib/Makefile
View File

@ -1,3 +1,7 @@
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 ip.c lists.c md5.c net.c patmatch.c printf.c sha1.c sha256.c sha512.c slists.c xmalloc.c
obj := $(src-o-files)
$(all-client)
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)
$(all-daemon)

106
lib/libssh.c Normal file
View File

@ -0,0 +1,106 @@
/*
* 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"
struct ssh_function {
void **fn;
const char *name;
};
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);
#define SSH_FN(x) { .fn = (void **) &x, .name = #x }
static struct ssh_function all_ssh_fn[] = {
SSH_FN(ssh_new),
SSH_FN(ssh_set_blocking),
SSH_FN(ssh_options_set),
SSH_FN(ssh_connect),
SSH_FN(ssh_get_fd),
SSH_FN(ssh_is_server_known),
SSH_FN(ssh_userauth_publickey_auto),
SSH_FN(ssh_get_error),
SSH_FN(ssh_get_error_code),
SSH_FN(ssh_disconnect),
SSH_FN(ssh_free),
SSH_FN(ssh_channel_new),
SSH_FN(ssh_channel_is_open),
SSH_FN(ssh_channel_close),
SSH_FN(ssh_channel_free),
SSH_FN(ssh_channel_open_session),
SSH_FN(ssh_channel_request_subsystem),
SSH_FN(ssh_channel_read_nonblocking),
SSH_FN(ssh_channel_is_eof),
SSH_FN(ssh_channel_select),
SSH_FN(ssh_channel_write),
};
#undef SSH_FN
static void *libssh;
/**
* load_libssh - Prepare all ssh_* functions
*
* Initialize for use all ssh_* functions. Returns normally NULL.
* If an error occurs then returns static string with the error description.
*/
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 */
for (int i = 0; i < sizeof(all_ssh_fn)/sizeof(all_ssh_fn[0]); i++)
{
*all_ssh_fn[i].fn = (void *) dlsym(libssh, all_ssh_fn[i].name);
err_buf = dlerror();
if (err_buf)
return err_buf;
}
return NULL;
}

123
lib/libssh.h Normal file
View File

@ -0,0 +1,123 @@
/*
* 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 {
SSH_LOG_NOLOG=0, /* No logging at all */
SSH_LOG_WARNING, /* Only warnings */
SSH_LOG_PROTOCOL, /* High level protocol information */
SSH_LOG_PACKET, /* Lower level protocol informations, packet level */
SSH_LOG_FUNCTIONS /* Every function path */
};
#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/resource.c
View File

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

2
lib/resource.h
View File

@ -37,7 +37,7 @@ struct resclass {
typedef struct pool pool;
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 rdump(void *); /* Dump to debug output */
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 "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 {
resource r;
@ -20,6 +38,7 @@ typedef struct birdsock {
int subtype; /* Socket subtype */
void *data; /* User data */
ip_addr saddr, daddr; /* IPA_NONE = unspecified */
const char *host; /* Alternative to daddr, NULL = unspecified */
uint sport, dport; /* 0 = unspecified (for IP: protocol type) */
int tos; /* TOS / traffic class, -1 = default */
int priority; /* Local socket priority, -1 = default */
@ -52,7 +71,8 @@ typedef struct birdsock {
node n;
void *rbuf_alloc, *tbuf_alloc;
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_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_UNIX_PASSIVE 8
#define SK_UNIX 9
#define SK_SSH_ACTIVE 10 /* - - * * - ? - DA = host */
#define SK_SSH 11
/*
* Socket subtypes

3
nest/proto.c
View File

@ -1262,6 +1262,9 @@ protos_build(void)
#ifdef CONFIG_BABEL
proto_build(&proto_babel);
#endif
#ifdef CONFIG_RPKI
proto_build(&proto_rpki);
#endif
proto_pool = rp_new(&root_pool, "Protocols");
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
proto_device, proto_radv, proto_rip, proto_static,
proto_ospf, proto_pipe, proto_bgp, proto_bfd, proto_babel;
proto_ospf, proto_pipe, proto_bgp, proto_bfd, proto_babel, proto_rpki;
/*
* Routing Protocol Instance
@ -271,7 +271,7 @@ proto_get_router_id(struct proto_config *pc)
}
/* 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;
@ -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);
/*
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_close(struct channel *c) { channel_set_state(c, CS_FLUSHING); }
*/
void channel_request_feeding(struct channel *c);
void *channel_config_new(const struct channel_class *cc, uint net_type, struct proto_config *proto);

5
nest/route.h
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@ -283,7 +283,7 @@ void *net_route(rtable *tab, const net_addr *n);
int net_roa_check(rtable *tab, const net_addr *n, u32 asn);
rte *rte_find(net *net, struct rte_src *src);
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 */
void rte_discard(rtable *tab, rte *old);
int rt_examine(rtable *t, net_addr *a, struct proto *p, struct filter *filter);
@ -384,6 +384,8 @@ typedef struct rta {
#define RTS_BGP 11 /* BGP route */
#define RTS_PIPE 12 /* Inter-table wormhole */
#define RTS_BABEL 13 /* Babel route */
#define RTS_RPKI 14 /* Route Origin Authorization */
#define RTC_UNICAST 0
#define RTC_BROADCAST 1
@ -561,6 +563,7 @@ extern struct protocol *attr_class_to_protocol[EAP_MAX];
#define DEF_PREF_BABEL 130 /* Babel */
#define DEF_PREF_RIP 120 /* RIP */
#define DEF_PREF_BGP 100 /* BGP */
#define DEF_PREF_RPKI 100 /* RPKI */
#define DEF_PREF_INHERITED 10 /* Routes inherited from other routing daemons */
/*

2
nest/rt-table.c
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@ -1291,7 +1291,7 @@ rte_unhide_dummy_routes(net *net, rte **dummy)
*/
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_stats *stats = &c->stats;

3
proto/Doc
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@ -4,7 +4,8 @@ C bfd
C bgp
C ospf
C pipe
C rip
C radv
C rip
C rpki
C static
S ../nest/rt-dev.c

5
proto/rpki/Doc Normal file
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@ -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)

144
proto/rpki/config.Y Normal file
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@ -0,0 +1,144 @@
/*
* 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)
#define RPKI_TR_SSH_CFG ((struct rpki_tr_ssh_config *) RPKI_CFG->tr_config.spec)
static void
rpki_check_unused_hostname(void)
{
if (RPKI_CFG->hostname != NULL)
cf_error("Only one cache server per protocol allowed");
}
static void
rpki_check_unused_transport(void)
{
if (RPKI_CFG->tr_config.spec != NULL)
cf_error("At the most one transport per protocol allowed");
}
CF_DECLS
CF_KEYWORDS(RPKI, REMOTE, BIRD, PRIVATE, PUBLIC, KEY, TCP, SSH, TRANSPORT, USER,
RETRY, REFRESH, EXPIRE, KEEP)
%type <i> rpki_keep_interval
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_RETRY_INTERVAL;
RPKI_CFG->refresh_interval = RPKI_REFRESH_INTERVAL;
RPKI_CFG->expire_interval = RPKI_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
| TRANSPORT rpki_transport
| REFRESH rpki_keep_interval expr {
if (rpki_check_refresh_interval($3))
cf_error(rpki_check_refresh_interval($3));
RPKI_CFG->refresh_interval = $3;
RPKI_CFG->keep_refresh_interval = $2;
}
| RETRY rpki_keep_interval expr {
if (rpki_check_retry_interval($3))
cf_error(rpki_check_retry_interval($3));
RPKI_CFG->retry_interval = $3;
RPKI_CFG->keep_retry_interval = $2;
}
| EXPIRE rpki_keep_interval expr {
if (rpki_check_expire_interval($3))
cf_error(rpki_check_expire_interval($3));
RPKI_CFG->expire_interval = $3;
RPKI_CFG->keep_expire_interval = $2;
}
;
rpki_keep_interval:
/* empty */ { $$ = 0; }
| KEEP { $$ = 1; }
;
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;
/* Ensure hostname is filled */
char *hostname = cfg_allocz(sizeof(INET6_ADDRSTRLEN + 1));
bsnprintf(hostname, INET6_ADDRSTRLEN+1, "%I", RPKI_CFG->ip);
RPKI_CFG->hostname = hostname;
}
;
rpki_transport:
TCP rpki_transport_tcp_init
| SSH rpki_transport_ssh_init '{' rpki_transport_ssh_opts '}' rpki_transport_ssh_check
;
rpki_transport_tcp_init:
{
rpki_check_unused_transport();
RPKI_CFG->tr_config.spec = cfg_allocz(sizeof(struct rpki_tr_tcp_config));
RPKI_CFG->tr_config.type = RPKI_TR_TCP;
};
rpki_transport_ssh_init:
{
rpki_check_unused_transport();
RPKI_CFG->tr_config.spec = cfg_allocz(sizeof(struct rpki_tr_ssh_config));
RPKI_CFG->tr_config.type = RPKI_TR_SSH;
};
rpki_transport_ssh_opts:
/* empty */
| rpki_transport_ssh_opts rpki_transport_ssh_item ';'
;
rpki_transport_ssh_item:
BIRD PRIVATE KEY text { RPKI_TR_SSH_CFG->bird_private_key = $4; }
| REMOTE PUBLIC KEY text { RPKI_TR_SSH_CFG->cache_public_key = $4; }
| USER text { RPKI_TR_SSH_CFG->user = $2; }
;
rpki_transport_ssh_check:
{
if (RPKI_TR_SSH_CFG->user == NULL)
cf_error("User must be set");
};
CF_CODE
CF_END

1077
proto/rpki/packets.c Normal file
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45
proto/rpki/packets.h Normal file
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@ -0,0 +1,45 @@
/*
* BIRD -- The Resource Public Key Infrastructure (RPKI) to Router Protocol
*
* (c) 2015 CZ.NIC
* (c) 2015 Pavel Tvrdik <pawel.tvrdik@gmail.com>
*
* 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_PDU_HEADER_LEN 8
/* A Error PDU size is the biggest (has encapsulate PDU inside):
* +8 bytes (Header size)
* +4 bytes (Length of Encapsulated PDU)
* +32 bytes (Encapsulated PDU IPv6 32)
* +4 bytes (Length of inserted text)
* +800 bytes (UTF-8 text 400*2 bytes)
* ------------
* = 848 bytes (Maximal expected PDU size) */
#define RPKI_PDU_MAX_LEN 848
/* RX buffer size has a great impact to scheduler granularity */
#define RPKI_RX_BUFFER_SIZE 4096
#define RPKI_TX_BUFFER_SIZE RPKI_PDU_MAX_LEN
/* Return values */
enum rpki_rtvals {
RPKI_SUCCESS = 0,
RPKI_ERROR = -1
};
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);
#endif

928
proto/rpki/rpki.c Normal file
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@ -0,0 +1,928 @@
/*
* BIRD -- The Resource Public Key Infrastructure (RPKI) to Router Protocol
*
* (c) 2015 CZ.NIC
* (c) 2015 Pavel Tvrdik <pawel.tvrdik@gmail.com>
*
* Using RTRlib: http://rpki.realmv6.org/
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
/**
* DOC: RPKI To Router (RPKI-RTR)
*
* The RPKI-RTR protocol is implemented in several files: |rpki.c| containing
* the routes handling, protocol logic, timer events, cache connection,
* reconfiguration, configuration and protocol glue with BIRD core, |packets.c|
* containing the RPKI packets handling and finally all transports files:
* |transport.c|, |tcp_transport.c| and |ssh_transport.c|.
*
* The |transport.c| is a middle layer and interface for each specific
* transport. Transport is a way how to wrap a communication with a cache
* server. There is supported an unprotected TCP transport and an encrypted
* SSHv2 transport. The SSH transport requires LibSSH library. LibSSH is
* loading dynamically using |dlopen()| function. SSH support is integrated in
* |sysdep/unix/io.c|. Each transport must implement an initialization
* function, an open function and a socket identification function. That's all.
*
* This implementation is based on the RTRlib (http://rpki.realmv6.org/). The
* BIRD takes over files |packets.c|, |rtr.c| (inside |rpki.c|), |transport.c|,
* |tcp_transport.c| and |ssh_transport.c| from RTRlib.
*
* A RPKI-RTR connection is described by a structure &rpki_cache. The main
* logic is located in |rpki_cache_change_state()| function. There is a state
* machine. The standard starting state flow looks like |Down| ~> |Connecting|
* ~> |Sync-Start| ~> |Sync-Running| ~> |Established| and then the last three
* states are periodically repeated.
*
* |Connecting| state establishes the transport connection. The state from a
* call |rpki_cache_change_state(CONNECTING)| to a call |rpki_connected_hook()|
*
* |Sync-Start| state starts with sending |Reset Query| or |Serial Query| and
* then waits for |Cache Response|. The state from |rpki_connected_hook()| to
* |rpki_handle_cache_response_pdu()|
*
* During |Sync-Running| BIRD receives data with IPv4/IPv6 Prefixes from cache
* server. The state starts from |rpki_handle_cache_response_pdu()| and ends
* in |rpki_handle_end_of_data_pdu()|.
*
* |Established| state means that BIRD has synced all data with cache server.
* Schedules a refresh timer event that invokes |Sync-Start|. Schedules Expire
* timer event and stops a Retry timer event.
*
* |Transport Error| state means that we have some troubles with a network
* connection. We cannot connect to a cache server or we wait too long for some
* expected PDU for received - |Cache Response| or |End of Data|. It closes
* current connection and schedules a Retry timer event.
*
* |Fatal Protocol Error| is occurred e.g. by received a bad Session ID. We
* restart a protocol, so all ROAs are flushed immediately.
*
* The RPKI-RTR protocol (RFC 6810 bis) defines configurable refresh, retry and
* expire intervals. For maintaining a connection are used timer events that
* are scheduled by |rpki_schedule_next_refresh()|,
* |rpki_schedule_next_retry()| and |rpki_schedule_next_expire()| functions.
*
* A Refresh timer event performs a sync of |Established| connection. So it
* shifts state to |Sync-Start|. If at the beginning of second call of a
* refresh event is connection in |Sync-Start| state then we didn't receive a
* |Cache Response| from a cache server and we invoke |Transport Error| state.
*
* A Retry timer event attempts to connect cache server. It is activated after
* |Transport Error| state and terminated by reaching |Established| state.
* If cache connection is still connecting to the cache server at the beginning
* of an event call then the Retry timer event invokes |Transport Error| state.
*
* An Expire timer event checks expiration of ROAs. If a last successful sync
* was more ago than the expire interval then the Expire timer event invokes a
* protocol restart thereby removes all ROAs learned from that cache server and
* continue trying to connect to cache server. The Expire event is activated
* by initial successful loading of ROAs, receiving End of Data PDU.
*
* A reconfiguration of cache connection works well without restarting when we
* change only intervals values.
*
* Supported standards:
* - RFC 6810 - main RPKI-RTR standard
* - RFC 6810 bis - an explicit timing parameters and protocol version number negotiation
*/
#include <stdlib.h>
#include <netdb.h>
#undef LOCAL_DEBUG
#include "rpki.h"
#include "lib/string.h"
#include "nest/cli.h"
/* Return values for reconfiguration functions */
#define NEED_RESTART 0
#define SUCCESSFUL_RECONF 1
static int rpki_open_connection(struct rpki_cache *cache);
static void rpki_close_connection(struct rpki_cache *cache);
static void rpki_schedule_next_refresh(struct rpki_cache *cache);
static void rpki_schedule_next_retry(struct rpki_cache *cache);
static void rpki_schedule_next_expire_check(struct rpki_cache *cache);
static void rpki_stop_refresh_timer_event(struct rpki_cache *cache);
static void rpki_stop_retry_timer_event(struct rpki_cache *cache);
static void rpki_stop_expire_timer_event(struct rpki_cache *cache);
/*
* Routes handling
*/
void
rpki_table_add_roa(struct rpki_cache *cache, struct channel *channel, const net_addr_union *pfxr)
{
struct rpki_proto *p = cache->p;
rta a0 = {
.src = p->p.main_source,
.source = RTS_RPKI,
.scope = SCOPE_UNIVERSE,
.cast = RTC_UNICAST,
.dest = RTD_BLACKHOLE,
};
rta *a = rta_lookup(&a0);
rte *e = rte_get_temp(a);
e->pflags = 0;
rte_update2(channel, &pfxr->n, e, a0.src);
}
void
rpki_table_remove_roa(struct rpki_cache *cache, struct channel *channel, const net_addr_union *pfxr)
{
struct rpki_proto *p = cache->p;
rte_update2(channel, &pfxr->n, NULL, p->p.main_source);
}
/*
* RPKI Protocol Logic
*/
static const char *str_cache_states[] = {
[RPKI_CS_CONNECTING] = "Connecting",
[RPKI_CS_ESTABLISHED] = "Established",
[RPKI_CS_RESET] = "Reseting",
[RPKI_CS_SYNC_START] = "Sync-Start",
[RPKI_CS_SYNC_RUNNING] = "Sync-Running",
[RPKI_CS_FAST_RECONNECT] = "Fast-Reconnect",
[RPKI_CS_NO_INCR_UPDATE_AVAIL]= "No-Increment-Update-Available",
[RPKI_CS_ERROR_NO_DATA_AVAIL] = "Cache-Error-No-Data-Available",
[RPKI_CS_ERROR_FATAL] = "Fatal-Protocol-Error",
[RPKI_CS_ERROR_TRANSPORT] = "Transport-Error",
[RPKI_CS_SHUTDOWN] = "Down"
};
/**
* rpki_cache_state_to_str - give a text representation of cache state
* @state: A cache state
*
* The function converts logic cache state into string.
*/
const char *
rpki_cache_state_to_str(enum rpki_cache_state state)
{
return str_cache_states[state];
}
/**
* rpki_start_cache - connect to a cache server
* @cache: RPKI connection instance
*
* This function is a high level method to kick up a connection to a cache server.
*/
static void
rpki_start_cache(struct rpki_cache *cache)
{
rpki_cache_change_state(cache, RPKI_CS_CONNECTING);
}
/**
* rpki_force_restart_proto - force shutdown and start protocol again
* @p: RPKI protocol instance
*
* This function calls shutdown and frees all protocol resources as well.
* After calling this function should be no operations with protocol data,
* they could be freed already.
*/
static void
rpki_force_restart_proto(struct rpki_proto *p)
{
if (p->cache)
{
CACHE_DBG(p->cache, "Connection object destroying");
}
/* Sign as freed */
p->cache = NULL;
proto_notify_state(&p->p, PS_DOWN);
}
/**
* rpki_cache_change_state - check and change cache state
* @cache: RPKI cache instance
* @new_state: suggested new state
*
* This function makes transitions between internal states.
* It represents the core of logic management of RPKI protocol.
* Cannot transit into the same state as cache is in already.
*/
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;
cache->state = new_state;
CACHE_TRACE(D_EVENTS, cache, "Changing from %s to %s state", rpki_cache_state_to_str(old_state), rpki_cache_state_to_str(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_START);
rpki_schedule_next_retry(cache);
break;
}
case RPKI_CS_ESTABLISHED:
rpki_schedule_next_refresh(cache);
rpki_schedule_next_expire_check(cache);
rpki_stop_retry_timer_event(cache);
break;
case RPKI_CS_RESET:
/* Resetting cache connection. */
cache->request_session_id = 1;
cache->serial_num = 0;
rpki_cache_change_state(cache, RPKI_CS_SYNC_START);
break;
case RPKI_CS_SYNC_START:
/* Requesting for receive ROAs from a cache server. */
if (cache->request_session_id)
{
/* Send request for Session ID */
if (rpki_send_reset_query(cache) != RPKI_SUCCESS)
rpki_cache_change_state(cache, RPKI_CS_ERROR_TRANSPORT);
}
else
{
/* We have already a session_id. So send a Serial Query and start an incremental sync */
if (rpki_send_serial_query(cache) != RPKI_SUCCESS)
rpki_cache_change_state(cache, RPKI_CS_ERROR_TRANSPORT);
}
break;
case RPKI_CS_SYNC_RUNNING:
/* The state between Cache Response and End of Data. Only waiting for
* receiving all IP Prefix PDUs and finally a End of Data PDU. */
break;
case RPKI_CS_NO_INCR_UPDATE_AVAIL:
/* Server was unable to answer the last Serial Query and sent Cache Reset. */
rpki_cache_change_state(cache, RPKI_CS_RESET);
break;
case RPKI_CS_ERROR_NO_DATA_AVAIL:
/* No validation records are available on the cache server. */
rpki_cache_change_state(cache, RPKI_CS_RESET);
break;
case RPKI_CS_ERROR_FATAL:
/* Fatal protocol error occurred. */
rpki_force_restart_proto(cache->p);
break;
case RPKI_CS_ERROR_TRANSPORT:
/* Error on the transport socket occurred. */
rpki_close_connection(cache);
rpki_schedule_next_retry(cache);
rpki_stop_refresh_timer_event(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:
bug("This isn't never really called.");
break;
};
}
/*
* RPKI Timer Events
*/
static void
rpki_schedule_next_refresh(struct rpki_cache *cache)
{
uint time_to_wait = cache->refresh_interval;
CACHE_DBG(cache, "after %u seconds", time_to_wait);
tm_start(cache->refresh_timer, time_to_wait);
}
static void
rpki_schedule_next_retry(struct rpki_cache *cache)
{
uint time_to_wait = cache->retry_interval;
CACHE_DBG(cache, "after %u seconds", time_to_wait);
tm_start(cache->retry_timer, time_to_wait);
}
static void
rpki_schedule_next_expire_check(struct rpki_cache *cache)
{
/* A minimum time to wait is 1 second */
uint time_to_wait = MAX(((int)cache->expire_interval - (int)(now - cache->last_update)), 1);
CACHE_DBG(cache, "after %u seconds", time_to_wait);
tm_start(cache->expire_timer, time_to_wait);
}
static void
rpki_stop_refresh_timer_event(struct rpki_cache *cache)
{
CACHE_DBG(cache, "Stop");
tm_stop(cache->refresh_timer);
}
static void
rpki_stop_retry_timer_event(struct rpki_cache *cache)
{
CACHE_DBG(cache, "Stop");
tm_stop(cache->retry_timer);
}
static void
rpki_stop_expire_timer_event(struct rpki_cache *cache)
{
CACHE_DBG(cache, "Stop");
tm_stop(cache->expire_timer);
}
static int
rpki_do_we_recv_prefix_pdu_in_last_seconds(struct rpki_cache *cache)
{
if (cache->last_rx_prefix == 0)
return 0;
return ((now - cache->last_rx_prefix) <= 2);
}
/**
* rpki_refresh_hook - control a scheduling of downloading data from cache server
* @tm: refresh timer with cache connection instance in data
*
* This function is periodically called during &ESTABLISHED or &SYNC* state
* cache connection. The first refresh schedule is invoked after receiving a
* |End of Data| PDU and has run by some &ERROR is occurred.
*/
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_START);
break;
case RPKI_CS_SYNC_START:
/* We sent Serial/Reset Query in last refresh hook call
* and didn't receive Cache Response yet. It is probably
* troubles with network. */
case RPKI_CS_SYNC_RUNNING:
/* We sent Serial/Reset Query in last refresh hook call
* and we got Cache Response but didn't get End-Of-Data yet.
* It could be a trouble with network or only too long synchronization. */
if (!rpki_do_we_recv_prefix_pdu_in_last_seconds(cache))
{
CACHE_TRACE(D_EVENTS, cache, "Sync takes more time than refresh interval %us, resetting connection", cache->refresh_interval);
rpki_cache_change_state(cache, RPKI_CS_ERROR_TRANSPORT);
}
break;
default:
break;
}
if (cache->state != RPKI_CS_SHUTDOWN && cache->state != RPKI_CS_ERROR_TRANSPORT)
rpki_schedule_next_refresh(cache);
else
rpki_stop_refresh_timer_event(cache);
}
/**
* rpki_retry_hook - control a scheduling of retrying connection to cache server
* @tm: retry timer with cache connection instance in data
*
* This function is periodically called during &ERROR* state cache connection.
* The first retry schedule is invoked after any &ERROR* state occurred and
* ends by reaching of &ESTABLISHED state again.
*/
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_SHUTDOWN:
break;
case RPKI_CS_CONNECTING:
case RPKI_CS_SYNC_START:
case RPKI_CS_SYNC_RUNNING:
if (!rpki_do_we_recv_prefix_pdu_in_last_seconds(cache))
{
/* We tried to establish a connection in last retry hook call and haven't done
* yet. It looks like troubles with network. We are aggressive here. */
CACHE_TRACE(D_EVENTS, cache, "Sync takes more time than retry interval %us, resetting connection.", cache->retry_interval);
rpki_cache_change_state(cache, RPKI_CS_ERROR_TRANSPORT);
}
break;
default:
rpki_cache_change_state(cache, RPKI_CS_CONNECTING);
break;
}
if (cache->state != RPKI_CS_ESTABLISHED)
rpki_schedule_next_retry(cache);
else
rpki_stop_retry_timer_event(cache);
}
/**
* rpki_expire_hook - control a expiration of ROA entries
* @tm: expire timer with cache connection instance in data
*
* This function is scheduled after received a |End of Data| PDU.
* A waiting interval is calculated dynamically by last update.
* If we reach an expiration time then we invoke a restarting
* of the protocol.
*/
static void
rpki_expire_hook(struct timer *tm)
{
struct rpki_cache *cache = tm->data;
if (cache->last_update == 0)
return;
CACHE_DBG(cache, "%s", rpki_cache_state_to_str(cache->state));
if ((cache->last_update + cache->expire_interval) < now)
{
CACHE_TRACE(D_EVENTS, cache, "All ROAs expired");
rpki_force_restart_proto(cache->p);
}
else
{
CACHE_DBG(cache, "Remains %d seconds to become ROAs obsolete", (int)cache->expire_interval - (int)(now - cache->last_update));
rpki_schedule_next_expire_check(cache);
}
}
/**
* rpki_check_refresh_interval - check validity of refresh interval value
* @seconds: suggested value
*
* This function validates value and should return |NULL|.
* If the check doesn't pass then returns error message.
*/
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
*
* This function validates value and should return |NULL|.
* If the check doesn't pass then returns error message.
*/
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
*
* This function validates value and should return |NULL|.
* If the check doesn't pass then returns error message.
*/
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;
}
/*
* RPKI Cache
*/
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;
cache->state = RPKI_CS_SHUTDOWN;
cache->request_session_id = 1;
cache->version = RPKI_MAX_VERSION;
cache->refresh_interval = cf->refresh_interval;
cache->retry_interval = cf->retry_interval;
cache->expire_interval = cf->expire_interval;
cache->refresh_timer = tm_new_set(pool, &rpki_refresh_hook, cache, 0, 0);
cache->retry_timer = tm_new_set(pool, &rpki_retry_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;
switch (cf->tr_config.type)
{
case RPKI_TR_TCP: rpki_tr_tcp_init(cache->tr_sock); break;
case RPKI_TR_SSH: rpki_tr_ssh_init(cache->tr_sock); break;
};
CACHE_DBG(cache, "Connection object created");
return cache;
}
/**
* rpki_get_cache_ident - give a text representation of cache server name
* @cache: RPKI connection instance
*
* The function converts cache connection into string.
*/
const char *
rpki_get_cache_ident(struct rpki_cache *cache)
{
return rpki_tr_ident(cache->tr_sock);
}
static int
rpki_open_connection(struct rpki_cache *cache)
{
CACHE_TRACE(D_EVENTS, cache, "Opening a connection");
if (rpki_tr_open(cache->tr_sock) == RPKI_TR_ERROR)
{
rpki_cache_change_state(cache, RPKI_CS_ERROR_TRANSPORT);
return RPKI_TR_ERROR;
}
return RPKI_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);
proto_notify_state(&cache->p->p, PS_START);
}
static int
rpki_shutdown(struct proto *P)
{
struct rpki_proto *p = (void *) P;
rpki_force_restart_proto(p);
/* Protocol memory pool will be automatically freed */
return PS_DOWN;
}
/*
* RPKI Reconfiguration
*/
static int
rpki_try_fast_reconnect(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);
return SUCCESSFUL_RECONF;
}
return NEED_RESTART;
}
/**
* rpki_reconfigure_cache - a cache reconfiguration
* @p: RPKI protocol instance
* @cache: a cache connection
* @new: new RPKI configuration
* @old: old RPKI configuration
*
* This function reconfigures existing single cache server connection with new
* existing configuration. Generally, a change of time intervals could be
* reconfigured without restarting and all others changes requires a restart of
* protocol. Returns |NEED_TO_RESTART| or |SUCCESSFUL_RECONF|.
*/
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 (strcmp(old->hostname, new->hostname) != 0)
{
CACHE_TRACE(D_EVENTS, cache, "Cache server address changed to %s", new->hostname);
return NEED_RESTART;
}
if (old->port != new->port)
{
CACHE_TRACE(D_EVENTS, cache, "Cache server port changed to %u", new->port);
return NEED_RESTART;
}
if (old->tr_config.type != new->tr_config.type)
{
CACHE_TRACE(D_EVENTS, cache, "Transport type changed");
return NEED_RESTART;
}
else if (new->tr_config.type == RPKI_TR_SSH)
{
struct rpki_tr_ssh_config *ssh_old = (void *) old->tr_config.spec;
struct rpki_tr_ssh_config *ssh_new = (void *) new->tr_config.spec;
if ((strcmp(ssh_old->bird_private_key, ssh_new->bird_private_key) != 0) ||
(strcmp(ssh_old->cache_public_key, ssh_new->cache_public_key) != 0) ||
(strcmp(ssh_old->user, ssh_new->user) != 0))
{
CACHE_TRACE(D_EVENTS, cache, "Settings of SSH transport configuration changed");
try_fast_reconnect = 1;
}
}
#define TEST_INTERVAL(name, Name) \
if (cache->name##_interval != new->name##_interval || \
old->keep_##name##_interval != new->keep_##name##_interval) \
{ \
cache->name##_interval = new->name##_interval; \
CACHE_TRACE(D_EVENTS, cache, #Name " interval changed to %u seconds %s", cache->name##_interval, (new->keep_##name##_interval ? "and keep it" : "")); \
try_fast_reconnect = 1; \
}
TEST_INTERVAL(refresh, Refresh);
TEST_INTERVAL(retry, Retry);
TEST_INTERVAL(expire, Expire);
#undef TEST_INTERVAL
if (try_fast_reconnect)
return rpki_try_fast_reconnect(cache, new, old);
return SUCCESSFUL_RECONF;
}
/**
* rpki_reconfigure - a protocol reconfiguration hook
* @P: a protocol instance
* @CF: a new protocol configuration
*
* This function reconfigures whole protocol.
* It sets new protocol configuration into a protocol structure.
* Returns |NEED_TO_RESTART| or |SUCCESSFUL_RECONF|.
*/
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;
struct rpki_cache *cache = p->cache;
if (!proto_configure_channel(&p->p, &p->roa4_channel, proto_cf_find_channel(CF, NET_ROA4)) ||
!proto_configure_channel(&p->p, &p->roa6_channel, proto_cf_find_channel(CF, NET_ROA6)))
return NEED_RESTART;
if (rpki_reconfigure_cache(p, cache, new, old) != SUCCESSFUL_RECONF)
return NEED_RESTART;
return SUCCESSFUL_RECONF;
}
/*
* RPKI Protocol Glue
*/
static struct proto *
rpki_init(struct proto_config *CF)
{
struct proto *P = proto_new(CF);
struct rpki_proto *p = (void *) P;
proto_configure_channel(&p->p, &p->roa4_channel, proto_cf_find_channel(CF, NET_ROA4));
proto_configure_channel(&p->p, &p->roa6_channel, proto_cf_find_channel(CF, NET_ROA6));
return P;
}
static int
rpki_start(struct proto *P)
{
struct rpki_proto *p = (void *) P;
struct rpki_config *cf = (void *) P->cf;
p->cache = rpki_init_cache(p, cf);
rpki_start_cache(p->cache);
return PS_START;
}
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 ---", name);
}
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 (P->proto_state == PS_DOWN)
return;
if (cache)
{
const char *transport_name = "---";
switch (cf->tr_config.type)
{
case RPKI_TR_SSH: transport_name = "SSHv2"; break;
case RPKI_TR_TCP: transport_name = "Unprotected over TCP"; break;
};
cli_msg(-1006, " Cache server: %s", rpki_get_cache_ident(cache));
cli_msg(-1006, " Status: %s", rpki_cache_state_to_str(cache->state));
cli_msg(-1006, " Transport: %s", transport_name);
cli_msg(-1006, " Protocol version: %u", cache->version);
if (cache->request_session_id)
cli_msg(-1006, " Session ID: ---");
else
cli_msg(-1006, " Session ID: %u", cache->session_id);
if (cache->last_update)
{
cli_msg(-1006, " Serial number: %u", cache->serial_num);
cli_msg(-1006, " Last update: before %us", now - cache->last_update);
}
else
{
cli_msg(-1006, " Serial number: ---");
cli_msg(-1006, " Last update: ---");
}
rpki_show_proto_info_timer("Refresh interval:", cache->refresh_interval, cache->refresh_timer);
rpki_show_proto_info_timer("Retry interval:", cache->retry_interval, cache->retry_timer);
rpki_show_proto_info_timer("Expire interval:", cache->expire_interval, cache->expire_timer);
if (p->roa4_channel)
channel_show_info(p->roa4_channel);
else
cli_msg(-1006, " No roa4 channel");
if (p->roa6_channel)
channel_show_info(p->roa6_channel);
else
cli_msg(-1006, " No roa6 channel");
}
}
/*
* RPKI Protocol Configuration
*/
/**
* rpki_check_config - check and complete configuration of RPKI protocol
* @cf: RPKI configuration
*
* This function is called at the end of parsing RPKI protocol configuration.
*/
void
rpki_check_config(struct rpki_config *cf)
{
/* Do not check templates at all */
if (cf->c.class == SYM_TEMPLATE)
return;
if (ipa_zero(cf->ip) && cf->hostname == NULL)
cf_error("IP address or hostname of cache server must be set");
/* Set default transport type */
if (cf->tr_config.spec == NULL)
{
cf->tr_config.spec = cfg_allocz(sizeof(struct rpki_tr_tcp_config));
cf->tr_config.type = RPKI_TR_TCP;
}
if (cf->port == 0)
{
/* Set default port numbers */
switch (cf->tr_config.type)
{
case RPKI_SSH_PORT:
cf->port = RPKI_SSH_PORT;
break;
default:
cf->port = RPKI_TCP_PORT;
}
}
}
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)
{
/* Just a shallow copy */
}
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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/*
* BIRD -- The Resource Public Key Infrastructure (RPKI) to Router Protocol
*
* (c) 2015 CZ.NIC
* (c) 2015 Pavel Tvrdik <pawel.tvrdik@gmail.com>
*
* 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 "transport.h"
#include "packets.h"
#define RPKI_TCP_PORT 323
#define RPKI_SSH_PORT 22
#define RPKI_RETRY_INTERVAL 600
#define RPKI_REFRESH_INTERVAL 3600
#define RPKI_EXPIRE_INTERVAL 7200
#define RPKI_VERSION_0 0
#define RPKI_VERSION_1 1
#define RPKI_MIN_VERSION RPKI_VERSION_0
#define RPKI_MAX_VERSION RPKI_VERSION_1
/*
* RPKI Cache
*/
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_START, /* Sending a Serial/Reset Query PDU and expecting a Cache Response PDU */
RPKI_CS_SYNC_RUNNING, /* Receiving validation records from the RTR server. A state between Cache Response PDU and End of Data PDU */
RPKI_CS_FAST_RECONNECT, /* Reconnect without any waiting period */
RPKI_CS_NO_INCR_UPDATE_AVAIL, /* Server is unable to answer the last Serial Query and sent Cache Reset. */
RPKI_CS_ERROR_NO_DATA_AVAIL, /* Server is unable to answer either a Serial Query or a Reset Query because it has no useful data available at this time. */
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. */
};
struct rpki_cache {
pool *pool; /* Pool containing cache objects */
struct rpki_proto *p;
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 received session id */
u32 serial_num; /* Serial number denotes the logical version of data from cache server */
u8 version; /* Protocol version */
bird_clock_t last_update; /* Last successful synchronization with cache server */
bird_clock_t last_rx_prefix; /* Last received prefix PDU */
/* Intervals can be changed by cache server on the fly */
u32 refresh_interval; /* Actual refresh interval */
u32 retry_interval;
u32 expire_interval;
timer *retry_timer; /* Retry timer event */
timer *refresh_timer; /* Refresh timer event */
timer *expire_timer; /* Expire timer event */
};
const char *rpki_get_cache_ident(struct rpki_cache *cache);
const char *rpki_cache_state_to_str(enum rpki_cache_state state);
/*
* Routes handling
*/
void rpki_table_add_roa(struct rpki_cache *cache, struct channel *channel, const net_addr_union *pfxr);
void rpki_table_remove_roa(struct rpki_cache *cache, struct channel *channel, const net_addr_union *pfxr);
/*
* RPKI Protocol Logic
*/
void rpki_cache_change_state(struct rpki_cache *cache, const enum rpki_cache_state new_state);
/*
* RPKI Timer Events
*/
const char *rpki_check_refresh_interval(uint seconds);
const char *rpki_check_retry_interval(uint seconds);
const char *rpki_check_expire_interval(uint seconds);
/*
* RPKI Protocol Configuration
*/
struct rpki_proto {
struct proto p;
struct rpki_cache *cache;
struct channel *roa4_channel;
struct channel *roa6_channel;
u8 refresh_channels; /* For non-incremental updates using rt_refresh_begin(), rt_refresh_end() */
};
struct rpki_config {
struct proto_config c;
const char *hostname; /* Full domain name or stringified IP address of cache server */
ip_addr ip; /* IP address of cache server or IPA_NONE */
u16 port; /* Port number of cache server */
struct rpki_tr_config tr_config; /* Specific transport configuration structure */
u32 refresh_interval; /* Time interval (in seconds) for periodical downloading data from cache server */
u32 retry_interval; /* Time interval (in seconds) for an unreachable server */
u32 expire_interval; /* Maximal lifetime (in seconds) of ROAs without any successful refreshment */
u8 keep_refresh_interval:1; /* Do not overwrite refresh interval by cache server update */
u8 keep_retry_interval:1; /* Do not overwrite retry interval by cache server update */
u8 keep_expire_interval:1; /* Do not overwrite expire interval by cache server update */
};
void rpki_check_config(struct rpki_config *cf);
/*
* Logger
*/
#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] %s " msg, rpki_get_cache_ident(cache), rpki_cache_state_to_str((cache)->state), __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, msg, ## args); \
} while(0)
#define RPKI_WARN(p, msg, args...) RPKI_LOG(L_WARN, p, msg, ## args);
#endif /* _BIRD_RPKI_H_ */

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/*
* BIRD -- An implementation of the SSH protocol for the RPKI transport
*
* (c) 2015 CZ.NIC
* (c) 2015 Pavel Tvrdik <pawel.tvrdik@gmail.com>
*
* 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 "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;
struct rpki_tr_ssh_config *ssh_cf = (void *) cf->tr_config.spec;
sock *sk = tr->sk;
const char *err_msg;
if ((err_msg = load_libssh()) != NULL)
{
CACHE_TRACE(D_EVENTS, cache, "%s", err_msg);
return RPKI_TR_ERROR;
}
sk->type = SK_SSH_ACTIVE;
sk->ssh = mb_allocz(sk->pool, sizeof(struct ssh_sock));
sk->ssh->username = ssh_cf->user;
sk->ssh->client_privkey_path = ssh_cf->bird_private_key;
sk->ssh->server_hostkey_path = ssh_cf->cache_public_key;
sk->ssh->subsystem = "rpki-rtr";
sk->ssh->state = SK_SSH_CONNECT;
if (sk_open(sk) != 0)
return RPKI_TR_ERROR;
return RPKI_TR_SUCCESS;
}
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_config *ssh_cf = (void *) cf->tr_config.spec;
if (tr->ident != NULL)
return tr->ident;
const char *username = ssh_cf->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);
tr->ident = ident;
return tr->ident;
}
/**
* rpki_tr_ssh_init - initializes the RPKI transport structure for a SSH connection
* @tr: allocated RPKI transport structure
*/
void
rpki_tr_ssh_init(struct rpki_tr_sock *tr)
{
tr->open_fp = &rpki_tr_ssh_open;
tr->ident_fp = &rpki_tr_ssh_ident;
}

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/*
* BIRD -- An implementation of the TCP protocol for the RPKI protocol transport
*
* (c) 2015 CZ.NIC
* (c) 2015 Pavel Tvrdik <pawel.tvrdik@gmail.com>
*
* 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 "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 RPKI_TR_ERROR;
return RPKI_TR_SUCCESS;
}
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;
if (tr->ident != NULL)
return tr->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);
tr->ident = ident;
return tr->ident;
}
/**
* rpki_tr_tcp_init - initializes the RPKI transport structure for a TCP connection
* @tr: allocated RPKI transport structure
*/
void
rpki_tr_tcp_init(struct rpki_tr_sock *tr)
{
tr->open_fp = &rpki_tr_tcp_open;
tr->ident_fp = &rpki_tr_tcp_ident;
}

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@ -0,0 +1,135 @@
/*
* BIRD -- The Resource Public Key Infrastructure (RPKI) to Router Protocol
*
* (c) 2015 CZ.NIC
* (c) 2015 Pavel Tvrdik <pawel.tvrdik@gmail.com>
*
* 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"
/**
* rpki_hostname_autoresolv - auto-resolve an IP address from a hostname
* @host: domain name of host, e.g. "rpki-validator.realmv6.org"
*
* This function resolves an IP address from a hostname.
* Returns &ip_addr structure with IP address or |IPA_NONE|.
*/
static ip_addr
rpki_hostname_autoresolv(const char *host)
{
ip_addr addr = {};
struct addrinfo *res;
struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
.ai_flags = AI_ADDRCONFIG,
};
if (!host)
return IPA_NONE;
int err_code = getaddrinfo(host, NULL, &hints, &res);
if (err_code != 0)
{
log(L_DEBUG "getaddrinfo failed: %s", gai_strerror(err_code));
return IPA_NONE;
}
sockaddr sa = {
.sa = *res->ai_addr,
};
uint unused;
sockaddr_read(&sa, res->ai_family, &addr, NULL, &unused);
freeaddrinfo(res);
return addr;
}
/**
* rpki_tr_open - prepare and open a socket connection
* @tr: initialized transport socket
*
* Prepare and open a socket connection specified by @tr that must be initialized before.
* This function ends with a calling the sk_open() function.
* Returns RPKI_TR_SUCCESS or RPKI_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->type -1 is invalid value, a correct value MUST be set in the specific transport layer in open_fp() hook */
sk->type = -1;
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;
if (ipa_zero2(sk->daddr) && sk->host)
{
sk->daddr = rpki_hostname_autoresolv(sk->host);
if (ipa_zero(sk->daddr))
{
CACHE_TRACE(D_EVENTS, cache, "Cannot resolve the hostname '%s'", sk->host);
return RPKI_TR_ERROR;
}
}
return tr->open_fp(tr);
}
/**
* rpki_tr_close - close socket and prepare it for possible next open
* @tr: successfully opened transport socket
*
* Close socket and free resources.
*/
void
rpki_tr_close(struct rpki_tr_sock *tr)
{
if (tr->ident)
{
mb_free((char *) tr->ident);
tr->ident = NULL;
}
if (tr->sk)
{
rfree(tr->sk);
tr->sk = NULL;
}
}
/**
* rpki_tr_ident - Returns a string identifier for the rpki transport socket
* @tr: successfully opened transport socket
*
* Returns a \0 terminated string identifier for the socket endpoint, e.g. "<host>:<port>".
* Memory is allocated inside @tr structure.
*/
inline const char *
rpki_tr_ident(struct rpki_tr_sock *tr)
{
return tr->ident_fp(tr);
}

79
proto/rpki/transport.h Normal file
View File

@ -0,0 +1,79 @@
/*
* BIRD -- The Resource Public Key Infrastructure (RPKI) to Router Protocol
*
* (c) 2015 CZ.NIC
* (c) 2015 Pavel Tvrdik <pawel.tvrdik@gmail.com>
*
* 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 structure, and forward the remaining arguments.
*/
#ifndef _BIRD_RPKI_TRANSPORT_H_
#define _BIRD_RPKI_TRANSPORT_H_
#include <time.h>
/* The return values for rpki_tr_ functions */
enum rpki_tr_rtvals {
RPKI_TR_SUCCESS = 0, /* Operation was successful */
RPKI_TR_ERROR = -1, /* Error occurred */
RPKI_TR_WOULDBLOCK = -2, /* No data is available on the socket */
RPKI_TR_INTR = -3, /* Call was interrupted from a signal */
RPKI_TR_CLOSED = -4 /* Connection closed */
};
/* A transport socket structure */
struct rpki_tr_sock {
sock *sk; /* Standard BIRD socket */
struct rpki_cache *cache; /* Cache server */
int (*open_fp)(struct rpki_tr_sock *); /* Function that establishes the socket connection */
const char *(*ident_fp)(struct rpki_tr_sock *); /* Function that returns an identifier for the socket endpoint */
const char *ident; /* Internal. Use ident_fp() hook instead of this pointer */
};
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);
/* Types of supported transports */
enum rpki_tr_type {
RPKI_TR_TCP, /* Unprotected transport over TCP */
RPKI_TR_SSH, /* Protected transport by SSHv2 connection */
};
/* Common configure structure for transports */
struct rpki_tr_config {
enum rpki_tr_type type; /* RPKI_TR_TCP or RPKI_TR_SSH */
const void *spec; /* Specific transport configuration, i.e. rpki_tr_tcp_config or rpki_tr_ssh_config */
};
struct rpki_tr_tcp_config {
/* No internal configuration data */
};
struct rpki_tr_ssh_config {
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 */
};
/* ssh_transport.c */
void rpki_tr_ssh_init(struct rpki_tr_sock *tr);
/* tcp_transport.c */
void rpki_tr_tcp_init(struct rpki_tr_sock *tr);
#endif /* _BIRD_RPKI_TRANSPORT_H_ */

1
sysdep/autoconf.h.in
View File

@ -44,6 +44,7 @@
#undef CONFIG_OSPF
#undef CONFIG_PIPE
#undef CONFIG_BABEL
#undef CONFIG_RPKI
/* We use multithreading */
#undef USE_PTHREADS

363
sysdep/unix/io.c
View File

@ -36,6 +36,7 @@
#include "lib/socket.h"
#include "lib/event.h"
#include "lib/string.h"
#include "lib/libssh.h"
#include "nest/iface.h"
#include "sysdep/unix/unix.h"
@ -1069,26 +1070,59 @@ 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)
{
if (ssh_channel_is_open(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
sk_free(resource *r)
{
sock *s = (sock *) r;
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)
current_sock = sk_next(s);
if (s == stored_sock)
stored_sock = sk_next(s);
rem_node(&s->n);
}
if (s->type != SK_SSH && s->type != SK_SSH_ACTIVE)
close(s->fd);
s->fd = -1;
}
void
@ -1139,7 +1173,7 @@ static void
sk_dump(resource *r)
{
sock *s = (sock *) r;
static char *sk_type_names[] = { "TCP<", "TCP>", "TCP", "UDP", NULL, "IP", NULL, "MAGIC", "UNIX<", "UNIX", "DEL!" };
static char *sk_type_names[] = { "TCP<", "TCP>", "TCP", "UDP", NULL, "IP", NULL, "MAGIC", "UNIX<", "UNIX", "SSH>", "SSH", "DEL!" };
debug("(%s, ud=%p, sa=%I, sp=%d, da=%I, dp=%d, tos=%d, ttl=%d, if=%s)\n",
sk_type_names[s->type],
@ -1190,6 +1224,9 @@ sk_setup(sock *s)
int y = 1;
int fd = s->fd;
if (s->type == SK_SSH_ACTIVE)
return 0;
if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
ERR("O_NONBLOCK");
@ -1302,6 +1339,14 @@ sk_tcp_connected(sock *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
sk_passive_connected(sock *s, int type)
{
@ -1354,6 +1399,195 @@ sk_passive_connected(sock *s, int type)
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));
/* TODO: Add SSH_OPTIONS_BINDADDR */
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
* @s: socket
@ -1419,6 +1653,11 @@ sk_open(sock *s)
do_bind = bind_port || ipa_nonzero(bind_addr);
break;
case SK_SSH_ACTIVE:
s->ttx = ""; /* Force s->ttx != s->tpos */
fd = sk_open_ssh(s);
break;
case SK_UDP:
fd = socket(af, SOCK_DGRAM, IPPROTO_UDP);
bind_port = s->sport;
@ -1499,6 +1738,7 @@ sk_open(sock *s)
ERR2("listen");
break;
case SK_SSH_ACTIVE:
case SK_MAGIC:
break;
@ -1508,6 +1748,7 @@ sk_open(sock *s)
if (!(s->flags & SKF_THREAD))
sk_insert(s);
return 0;
err:
@ -1690,6 +1931,26 @@ sk_maybe_write(sock *s)
reset_tx_buffer(s);
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_IP:
{
@ -1714,6 +1975,7 @@ sk_maybe_write(sock *s)
reset_tx_buffer(s);
return 1;
}
default:
bug("sk_maybe_write: unknown socket type %d", s->type);
}
@ -1793,6 +2055,62 @@ 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 */
int
@ -1826,17 +2144,15 @@ sk_read(sock *s, int revents)
else
{
s->rpos += c;
if (s->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;
}
call_rx_hook(s, s->rpos - s->rbuf);
return 1;
}
return 0;
}
case SK_SSH:
return sk_read_ssh(s);
case SK_MAGIC:
return s->rx_hook(s, 0);
@ -1875,6 +2191,25 @@ sk_write(sock *s)
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:
if (s->ttx != s->tpos && sk_maybe_write(s) > 0)
{