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/* |
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conf.c -- configuration code |
3 |
Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
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|
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This file is part of GVPE. |
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|
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GVPE is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with gvpe; if not, write to the Free Software |
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Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#include "config.h" |
23 |
|
24 |
#include <cstdio> |
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#include <cstdlib> |
26 |
#include <cstring> |
27 |
|
28 |
#include <errno.h> |
29 |
#include <netdb.h> |
30 |
#include <sys/stat.h> |
31 |
#include <sys/types.h> |
32 |
#include <unistd.h> |
33 |
|
34 |
#include "netcompat.h" |
35 |
|
36 |
#include <openssl/err.h> |
37 |
#include <openssl/pem.h> |
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#include <openssl/rsa.h> |
39 |
#include <openssl/rand.h> |
40 |
#include <openssl/bn.h> |
41 |
|
42 |
#include "conf.h" |
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#include "slog.h" |
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#include "util.h" |
45 |
|
46 |
char *confbase; |
47 |
char *thisnode; |
48 |
char *identname; |
49 |
|
50 |
struct configuration conf; |
51 |
|
52 |
u8 best_protocol (u8 protset) |
53 |
{ |
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if (protset & PROT_IPv4 ) return PROT_IPv4; |
55 |
if (protset & PROT_ICMPv4) return PROT_ICMPv4; |
56 |
if (protset & PROT_UDPv4 ) return PROT_UDPv4; |
57 |
if (protset & PROT_TCPv4 ) return PROT_TCPv4; |
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if (protset & PROT_DNSv4 ) return PROT_DNSv4; |
59 |
|
60 |
return 0; |
61 |
} |
62 |
|
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const char *strprotocol (u8 protocol) |
64 |
{ |
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if (protocol & PROT_IPv4 ) return "rawip"; |
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if (protocol & PROT_ICMPv4) return "icmp"; |
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if (protocol & PROT_UDPv4 ) return "udp"; |
68 |
if (protocol & PROT_TCPv4 ) return "tcp"; |
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if (protocol & PROT_DNSv4 ) return "dns"; |
70 |
|
71 |
return "<unknown>"; |
72 |
} |
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|
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void |
75 |
conf_node::print () |
76 |
{ |
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printf ("%4d fe:fd:80:00:0%1x:%02x %c %-8.8s %-10.10s %s%s%d\n", |
78 |
id, |
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id >> 8, id & 0xff, |
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compress ? 'Y' : 'N', |
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connectmode == C_ONDEMAND ? "ondemand" : |
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connectmode == C_NEVER ? "never" : |
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connectmode == C_ALWAYS ? "always" : "", |
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nodename, |
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hostname ? hostname : "", |
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hostname ? ":" : "", |
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hostname ? udp_port : 0 |
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); |
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} |
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|
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conf_node::~conf_node () |
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{ |
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if (rsa_key) |
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RSA_free (rsa_key); |
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|
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free (nodename); |
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free (hostname); |
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#if ENABLE_DNS |
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free (domain); |
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free (dns_hostname); |
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#endif |
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} |
103 |
|
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void configuration::init () |
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{ |
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memset (this, 0, sizeof (*this)); |
107 |
|
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mtu = DEFAULT_MTU; |
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rekey = DEFAULT_REKEY; |
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keepalive = DEFAULT_KEEPALIVE; |
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llevel = L_INFO; |
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ip_proto = IPPROTO_GRE; |
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#if ENABLE_ICMP |
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icmp_type = ICMP_ECHOREPLY; |
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#endif |
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|
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default_node.udp_port = DEFAULT_UDPPORT; |
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default_node.tcp_port = DEFAULT_UDPPORT; // ehrm |
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default_node.connectmode = conf_node::C_ALWAYS; |
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default_node.compress = true; |
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default_node.protocols = 0; |
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default_node.max_retry = DEFAULT_MAX_RETRY; |
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|
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#if ENABLE_DNS |
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default_node.dns_port = 0; // default is 0 == client |
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dns_forw_host = strdup ("127.0.0.1"); |
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dns_forw_port = 53; |
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#endif |
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|
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conf.pidfilename = strdup (LOCALSTATEDIR "/run/gvpe.pid"); |
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} |
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|
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void configuration::cleanup() |
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{ |
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if (rsa_key) |
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RSA_free (rsa_key); |
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|
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rsa_key = 0; |
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|
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free (pidfilename); pidfilename = 0; |
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free (ifname); ifname = 0; |
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#if ENABLE_HTTP_PROXY |
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free (proxy_host); proxy_host = 0; |
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free (proxy_auth); proxy_auth = 0; |
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#endif |
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#if ENABLE_DNS |
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free (dns_forw_host); dns_forw_host = 0; |
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#endif |
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} |
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|
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void |
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configuration::clear_config () |
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{ |
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for (configuration::node_vector::iterator i = nodes.begin(); i != nodes.end(); ++i) |
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delete *i; |
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|
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nodes.clear (); |
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|
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cleanup (); |
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init (); |
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} |
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|
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#define parse_bool(target,name,trueval,falseval) \ |
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if (!strcmp (val, "yes")) target = trueval; \ |
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else if (!strcmp (val, "no")) target = falseval; \ |
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else if (!strcmp (val, "true")) target = trueval; \ |
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else if (!strcmp (val, "false")) target = falseval; \ |
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else if (!strcmp (val, "on")) target = trueval; \ |
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else if (!strcmp (val, "off")) target = falseval; \ |
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else \ |
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slog (L_WARN, \ |
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_("illegal value for '%s', only 'yes|true|on' or 'no|false|off' allowed, at '%s' line %d"), \ |
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name, var, fname, lineno); |
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|
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void configuration::read_config (bool need_keys) |
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{ |
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char *fname; |
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FILE *f; |
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|
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clear_config (); |
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|
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asprintf (&fname, "%s/gvpe.conf", confbase); |
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f = fopen (fname, "r"); |
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|
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if (f) |
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{ |
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char line[16384]; |
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int lineno = 0; |
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char *var, *val; |
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conf_node *node = &default_node; |
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|
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while (fgets (line, sizeof (line), f)) |
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{ |
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lineno++; |
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|
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{ |
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char *end = line + strlen (line); |
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|
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while (*end < ' ' && end >= line) |
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end--; |
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|
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*++end = 0; |
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} |
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|
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char *tok = line; |
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|
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retry: |
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var = strtok (tok, "\t ="); |
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tok = 0; |
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|
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if (!var || !var[0]) |
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continue; /* no tokens on this line */ |
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|
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if (var[0] == '#') |
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continue; /* comment: ignore */ |
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|
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val = strtok (NULL, "\t\n\r ="); |
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|
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if (!val || val[0] == '#') |
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{ |
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slog (L_WARN, |
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_("no value for variable `%s', at '%s' line %d, skipping."), |
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var, fname, lineno); |
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continue; |
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} |
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|
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if (!strcmp (var, "on")) |
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{ |
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if (!::thisnode |
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|| (val[0] == '!' && strcmp (val + 1, ::thisnode)) |
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|| !strcmp (val, ::thisnode)) |
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goto retry; |
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|
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continue; |
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} |
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|
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// truly global |
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if (!strcmp (var, "loglevel")) |
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{ |
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loglevel l = string_to_loglevel (val); |
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|
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if (l != L_NONE) |
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llevel = l; |
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else |
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slog (L_WARN, "'%s': %s, at '%s' line %d", val, UNKNOWN_LOGLEVEL, fname, line); |
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} |
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else if (!strcmp (var, "ip-proto")) |
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ip_proto = atoi (val); |
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else if (!strcmp (var, "icmp-type")) |
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{ |
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#if ENABLE_ICMP |
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icmp_type = atoi (val); |
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#endif |
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} |
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|
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// per config |
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else if (!strcmp (var, "node")) |
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{ |
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default_node.id++; |
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|
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node = new conf_node (default_node); |
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|
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nodes.push_back (node); |
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|
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node->nodename = strdup (val); |
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|
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{ |
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char *fname; |
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FILE *f; |
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|
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asprintf (&fname, "%s/pubkey/%s", confbase, node->nodename); |
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|
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f = fopen (fname, "r"); |
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if (f) |
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{ |
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node->rsa_key = RSA_new (); |
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|
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if (!PEM_read_RSAPublicKey(f, &node->rsa_key, NULL, NULL)) |
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{ |
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ERR_load_RSA_strings (); ERR_load_PEM_strings (); |
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slog (L_ERR, _("unable to open public rsa key file '%s': %s"), fname, ERR_error_string (ERR_get_error (), 0)); |
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exit (EXIT_FAILURE); |
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} |
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|
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require (RSA_blinding_on (node->rsa_key, 0)); |
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|
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fclose (f); |
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} |
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else |
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{ |
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slog (need_keys ? L_ERR : L_NOTICE, _("unable to read public rsa key file '%s': %s"), fname, strerror (errno)); |
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|
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if (need_keys) |
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exit (EXIT_FAILURE); |
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} |
296 |
|
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free (fname); |
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} |
299 |
|
300 |
if (::thisnode && !strcmp (node->nodename, ::thisnode)) |
301 |
thisnode = node; |
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} |
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else if (!strcmp (var, "private-key")) |
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free (prikeyfile), prikeyfile = strdup (val); |
305 |
else if (!strcmp (var, "ifpersist")) |
306 |
parse_bool (ifpersist, "ifpersist", true, false); |
307 |
else if (!strcmp (var, "ifname")) |
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free (ifname), ifname = strdup (val); |
309 |
else if (!strcmp (var, "rekey")) |
310 |
rekey = atoi (val); |
311 |
else if (!strcmp (var, "keepalive")) |
312 |
keepalive = atoi (val); |
313 |
else if (!strcmp (var, "mtu")) |
314 |
mtu = atoi (val); |
315 |
else if (!strcmp (var, "if-up")) |
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free (script_if_up), script_if_up = strdup (val); |
317 |
else if (!strcmp (var, "node-up")) |
318 |
free (script_node_up), script_node_up = strdup (val); |
319 |
else if (!strcmp (var, "node-down")) |
320 |
free (script_node_down), script_node_down = strdup (val); |
321 |
else if (!strcmp (var, "pid-file")) |
322 |
free (pidfilename), pidfilename = strdup (val); |
323 |
else if (!strcmp (var, "dns-forw-host")) |
324 |
{ |
325 |
#if ENABLE_DNS |
326 |
free (dns_forw_host), dns_forw_host = strdup (val); |
327 |
#endif |
328 |
} |
329 |
else if (!strcmp (var, "dns-forw-port")) |
330 |
{ |
331 |
#if ENABLE_DNS |
332 |
dns_forw_port = atoi (val); |
333 |
#endif |
334 |
} |
335 |
else if (!strcmp (var, "http-proxy-host")) |
336 |
{ |
337 |
#if ENABLE_HTTP_PROXY |
338 |
free (proxy_host), proxy_host = strdup (val); |
339 |
#endif |
340 |
} |
341 |
else if (!strcmp (var, "http-proxy-port")) |
342 |
{ |
343 |
#if ENABLE_HTTP_PROXY |
344 |
proxy_port = atoi (val); |
345 |
#endif |
346 |
} |
347 |
else if (!strcmp (var, "http-proxy-auth")) |
348 |
{ |
349 |
#if ENABLE_HTTP_PROXY |
350 |
proxy_auth = (char *)base64_encode ((const u8 *)val, strlen (val)); |
351 |
#endif |
352 |
} |
353 |
|
354 |
/* node-specific, non-defaultable */ |
355 |
else if (node != &default_node && !strcmp (var, "hostname")) |
356 |
free (node->hostname), node->hostname = strdup (val); |
357 |
|
358 |
/* node-specific, defaultable */ |
359 |
else if (!strcmp (var, "udp-port")) |
360 |
node->udp_port = atoi (val); |
361 |
else if (!strcmp (var, "tcp-port")) |
362 |
node->tcp_port = atoi (val); |
363 |
else if (!strcmp (var, "dns-hostname")) |
364 |
{ |
365 |
#if ENABLE_DNS |
366 |
free (node->dns_hostname), node->dns_hostname = strdup (val); |
367 |
#endif |
368 |
} |
369 |
else if (!strcmp (var, "dns-port")) |
370 |
{ |
371 |
#if ENABLE_DNS |
372 |
node->dns_port = atoi (val); |
373 |
#endif |
374 |
} |
375 |
else if (!strcmp (var, "dns-domain")) |
376 |
{ |
377 |
#if ENABLE_DNS |
378 |
free (node->domain), node->domain = strdup (val); |
379 |
#endif |
380 |
} |
381 |
else if (!strcmp (var, "router-priority")) |
382 |
node->routerprio = atoi (val); |
383 |
else if (!strcmp (var, "max-retry")) |
384 |
node->max_retry = atoi (val); |
385 |
else if (!strcmp (var, "connect")) |
386 |
{ |
387 |
if (!strcmp (val, "ondemand")) |
388 |
node->connectmode = conf_node::C_ONDEMAND; |
389 |
else if (!strcmp (val, "never")) |
390 |
node->connectmode = conf_node::C_NEVER; |
391 |
else if (!strcmp (val, "always")) |
392 |
node->connectmode = conf_node::C_ALWAYS; |
393 |
else if (!strcmp (val, "disabled")) |
394 |
node->connectmode = conf_node::C_DISABLED; |
395 |
else |
396 |
slog (L_WARN, |
397 |
_("illegal value for 'connectmode', use one of 'ondemand', 'never', 'always' or 'disabled', at '%s' line %d, ignoring."), |
398 |
var, fname, lineno); |
399 |
} |
400 |
else if (!strcmp (var, "inherit-tos")) |
401 |
parse_bool (node->inherit_tos, "inherit-tos", true, false); |
402 |
else if (!strcmp (var, "compress")) |
403 |
parse_bool (node->compress, "compress", true, false); |
404 |
// all these bool options really really cost a lot of executable size! |
405 |
else if (!strcmp (var, "enable-tcp")) |
406 |
{ |
407 |
#if ENABLE_TCP |
408 |
u8 v; parse_bool (v, "enable-tcp" , PROT_TCPv4, 0); node->protocols = (node->protocols & ~PROT_TCPv4) | v; |
409 |
#endif |
410 |
} |
411 |
else if (!strcmp (var, "enable-icmp")) |
412 |
{ |
413 |
#if ENABLE_ICMP |
414 |
u8 v; parse_bool (v, "enable-icmp" , PROT_ICMPv4, 0); node->protocols = (node->protocols & ~PROT_ICMPv4) | v; |
415 |
#endif |
416 |
} |
417 |
else if (!strcmp (var, "enable-dns")) |
418 |
{ |
419 |
#if ENABLE_DNS |
420 |
u8 v; parse_bool (v, "enable-dns" , PROT_DNSv4, 0); node->protocols = (node->protocols & ~PROT_DNSv4) | v; |
421 |
#endif |
422 |
} |
423 |
else if (!strcmp (var, "enable-udp")) |
424 |
{ |
425 |
u8 v; parse_bool (v, "enable-udp" , PROT_UDPv4, 0); node->protocols = (node->protocols & ~PROT_UDPv4) | v; |
426 |
} |
427 |
else if (!strcmp (var, "enable-rawip")) |
428 |
{ |
429 |
u8 v; parse_bool (v, "enable-rawip", PROT_IPv4, 0); node->protocols = (node->protocols & ~PROT_IPv4 ) | v; |
430 |
} |
431 |
|
432 |
// unknown or misplaced |
433 |
else |
434 |
slog (L_WARN, |
435 |
_("unknown or misplaced variable `%s', at '%s' line %d, skipping."), |
436 |
var, fname, lineno); |
437 |
} |
438 |
|
439 |
fclose (f); |
440 |
} |
441 |
else |
442 |
{ |
443 |
slog (L_ERR, _("unable to read config file '%s': %s"), fname, strerror (errno)); |
444 |
exit (EXIT_FAILURE); |
445 |
} |
446 |
|
447 |
free (fname); |
448 |
|
449 |
fname = config_filename (prikeyfile, "hostkey"); |
450 |
|
451 |
f = fopen (fname, "r"); |
452 |
if (f) |
453 |
{ |
454 |
rsa_key = RSA_new (); |
455 |
|
456 |
if (!PEM_read_RSAPrivateKey (f, &rsa_key, NULL, NULL)) |
457 |
{ |
458 |
ERR_load_RSA_strings (); ERR_load_PEM_strings (); |
459 |
slog (L_ERR, _("unable to read private rsa key file '%s': %s"), fname, ERR_error_string (ERR_get_error (), 0)); |
460 |
exit (EXIT_FAILURE); |
461 |
} |
462 |
|
463 |
require (RSA_blinding_on (rsa_key, 0)); |
464 |
|
465 |
fclose (f); |
466 |
} |
467 |
else |
468 |
{ |
469 |
slog (need_keys ? L_ERR : L_NOTICE, _("unable to open private rsa key file '%s': %s"), fname, strerror (errno)); |
470 |
|
471 |
if (need_keys) |
472 |
exit (EXIT_FAILURE); |
473 |
} |
474 |
|
475 |
if (need_keys && ::thisnode |
476 |
&& rsa_key && thisnode && thisnode->rsa_key) |
477 |
if (BN_cmp (rsa_key->n, thisnode->rsa_key->n) != 0 |
478 |
|| BN_cmp (rsa_key->e, thisnode->rsa_key->e) != 0) |
479 |
{ |
480 |
slog (L_NOTICE, _("private hostkey and public node key mismatch: is '%s' the correct node?"), ::thisnode); |
481 |
exit (EXIT_FAILURE); |
482 |
} |
483 |
|
484 |
free (fname); |
485 |
} |
486 |
|
487 |
char *configuration::config_filename (const char *name, const char *dflt) |
488 |
{ |
489 |
char *fname; |
490 |
|
491 |
asprintf (&fname, name ? name : dflt, ::thisnode); |
492 |
|
493 |
if (!ABSOLUTE_PATH (fname)) |
494 |
{ |
495 |
char *rname = fname; |
496 |
asprintf (&fname, "%s/%s", confbase, rname); |
497 |
free (rname); |
498 |
} |
499 |
|
500 |
return fname; |
501 |
} |
502 |
|
503 |
void |
504 |
configuration::print () |
505 |
{ |
506 |
printf (_("\nConfiguration\n\n")); |
507 |
printf (_("# of nodes: %d\n"), nodes.size ()); |
508 |
printf (_("this node: %s\n"), thisnode ? thisnode->nodename : "<unset>"); |
509 |
printf (_("MTU: %d\n"), mtu); |
510 |
printf (_("rekeying interval: %d\n"), rekey); |
511 |
printf (_("keepalive interval: %d\n"), keepalive); |
512 |
printf (_("interface: %s\n"), ifname); |
513 |
printf (_("primary rsa key: %s\n"), prikeyfile ? prikeyfile : "<default>"); |
514 |
printf (_("rsa key size: %d\n"), rsa_key ? RSA_size (rsa_key) * 8 : -1); |
515 |
printf ("\n"); |
516 |
|
517 |
printf ("%4s %-17s %s %-8.8s %-10.10s %s\n", |
518 |
_("ID#"), _("MAC"), _("Com"), _("Conmode"), _("Node"), _("Host:Port")); |
519 |
|
520 |
for (node_vector::iterator i = nodes.begin (); i != nodes.end (); ++i) |
521 |
(*i)->print (); |
522 |
|
523 |
printf ("\n"); |
524 |
} |
525 |
|
526 |
configuration::configuration () |
527 |
{ |
528 |
asprintf (&confbase, "%s/gvpe", CONFDIR); |
529 |
|
530 |
init (); |
531 |
} |
532 |
|
533 |
configuration::~configuration () |
534 |
{ |
535 |
cleanup (); |
536 |
} |
537 |
|
538 |
|