spi.c

FREESWAN VPN源代码包

/*
 * All-in-one program to set Security Association parameters
 * Copyright (C) 1996  John Ioannidis.
 * Copyright (C) 1997, 1998, 1999, 2000, 2001  Richard Guy Briggs.
 * 
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 */

char spi_c_version[] = "RCSID $Id: spi.c,v 1.5 2003/05/26 12:47:12 ken Exp $";

#include <asm/types.h>
#include <sys/types.h>
#include <sys/ioctl.h>
/* #include <linux/netdevice.h> */
#include <net/if.h>
/* #include <linux/types.h> */ /* new */
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>

/* #include <sys/socket.h> */

#include <netinet/in.h>
#include <arpa/inet.h>
/* #include <linux/ip.h> */
#include <netdb.h>

#include <unistd.h>
#include <getopt.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <freeswan.h>
#include <signal.h>
#include <sys/socket.h>
#include <pfkeyv2.h>
#include <pfkey.h>
#include "ipsec_xform.h"

/* 	
 * 	Manual conn support for ipsec_alg (modular algos).
 * 	Rather ugly to include from pluto dir but avoids
 * 	code duplication.
 */
#ifndef NO_KERNEL_ALG
#include "../../pluto/alg_info.h"
#include "../../pluto/constants.h"
struct connection;
#include "../../pluto/kernel_alg.h"
#endif /* NO_KERNEL_ALG */

char *program_name;
char me[] = "ipsec spi";
int debug = 0;
char *command;
extern char *optarg;
extern int optind, opterr, optopt;
char scratch[2];
char *iv = NULL, *enckey = NULL, *authkey = NULL;
size_t ivlen = 0, enckeylen = 0, authkeylen = 0;
ip_address edst, dst, src;
int address_family = 0;
unsigned char proto = 0;
int alg = 0;

#ifndef NO_KERNEL_ALG
/* 
 * 	Manual connection support for modular algos (ipsec_alg) --Juanjo.
 */
#define XF_OTHER_ALG (XF_CLR-1)	/* define magic XF_ symbol for alg_info's */
#include <assert.h>
const char *alg_string = NULL;	/* algorithm string */
struct alg_info_esp *alg_info = NULL;	/* algorithm info got from string */
struct esp_info *esp_info = NULL;	/* esp info from 1st (only) element */
const char *alg_err;		/* auxiliar for parsing errors */
int proc_read_ok = 0;		/* /proc/net/pf_key_support read ok */
#endif /* NO_KERNEL_ALG */

int replay_window = 0;
char sa[SATOT_BUF];

extern unsigned int pfkey_lib_debug; /* used by libfreeswan/pfkey_v2_build */
int pfkey_sock;
fd_set pfkey_socks;
uint32_t pfkey_seq = 0;
enum life_severity {
	life_soft = 0,
	life_hard = 1,
	life_maxsever = 2
};
enum life_type {
	life_alloc = 0,
	life_bytes = 1,
	life_addtime = 2,
	life_usetime = 3,
	life_packets = 4,
	life_maxtype = 5
};

#define streql(_a,_b) (!strcmp((_a),(_b)))

static const char *usage_string = "\
Usage:\n\
	in the following, <SA> is: --af <inet | inet6> --edst <dstaddr> --spi <spi> --proto <proto>\n\
                               OR: --said <proto><.|:><spi>@<dstaddr>\n\
	                  <life> is: --life <soft|hard>-<allocations|bytes|addtime|usetime|packets>=<value>[,...]\n\
spi --clear\n\
spi --help\n\
spi --version\n\
spi\n\
spi --del <SA>\n\
spi --ip4 <SA> --src <encap-src> --dst <encap-dst>\n\
spi --ip6 <SA> --src <encap-src> --dst <encap-dst>\n\
spi --ah <algo> <SA> [<life> ][ --replay_window <replay_window> ] --authkey <key>\n\
	where <algo> is one of:	hmac-md5-96 | hmac-sha1-96\n\
spi --esp <algo> <SA> [<life> ][ --replay_window <replay-window> ] --enckey <ekey> --authkey <akey>\n\
	where <algo> is one of:	3des-md5-96 | 3des-sha1-96\n\
spi --esp <algo> <SA> [<life> ][ --replay_window <replay-window> ] --enckey <ekey>\n\
	where <algo> is:	3des\n\
spi --comp <algo> <SA>\n\
	where <algo> is:	deflate\n\
[ --debug ] is optional to any spi command.\n\
[ --label <label> ] is optional to any spi command.";


static void
usage(char *s, FILE *f)
{
	/* s argument is actually ignored, at present */
	fprintf(f, "%s:%s", s, usage_string);
	exit(-1);
}


#ifdef SIGS_FROM_BELOW
static void
pfkey_sig_handler(int x)
{
	int len;
	int error = 0;
#if 0
	int i;
	fd_set l_pfkey_socks;
#endif
	unsigned char buffer[PFKEYv2_MAX_MSGSIZE];
	struct sadb_ext *extensions_parse[SADB_EXT_MAX + 1];
	struct sadb_msg *pfkey_msg;
	
	/* if(signal.type == SIGIO) } */
	while(1) {
#if 0
		memcpy(&l_pfkey_socks, &pfkey_socks, sizeof(pfkey_socks));
		
		fprintf(stdout, "%s:pfkey_sig_handler: "
			"entering select for pfkey_sock=%d.\n",
			program_name,
			pfkey_sock);
		if((i = select(pfkey_sock + 1, &l_pfkey_socks, NULL, NULL, NULL)) < 0) {
			fprintf(stderr, "%s:system error:pfkey_sig_handler: "
				"select returned errno:%d.\n",
				program_name,
				errno);
			break;
		}
		if(!i) {
			fprintf(stdout, "%s:pfkey_sig_handler: "
				"select returned %d.\n",
				program_name,
				i);
			return;
		}

		ret = recvmsg(pfkey_sock,
			      /* struct msghdr * */msg,
			      /* unsigned int */flags);
		if(ret == -1) {
			fprintf(stderr, "%s: pfkey recvmsg failed.\n",
				program_name);
			switch(errno) {
			case EBADF:
			case ENOTCONN:
			case ENOTSOCK:
			case EWOULDBLOCK:
			case EINTR:
			case EFAULT:
				fprintf(stderr, "system error:%d\n",
					errno);
				exit(1);
			default:
				fprintf(stderr, "unknown error:%d\n",
					errno);
				exit(1);
			}
		}
#endif
		fprintf(stdout, "%s:pfkey_sig_handler: "
			"entering read for pfkey_sock=%d.\n",
			program_name,
			pfkey_sock);
		if((len = read(pfkey_sock, buffer, sizeof(buffer))) < 0) {
			fprintf(stderr, "%s: pfkey read failed.\n",
				program_name);
			switch(errno) {
			case EBADF:
			case ENOTCONN:
			case ENOTSOCK:
			case EWOULDBLOCK:
			case EINTR:
			case EFAULT:
				fprintf(stderr, "%s:system error:%d\n",
					program_name,
					errno);
				exit(1);
			default:
				fprintf(stderr, "%s:unknown error:%d\n",
					program_name,
					errno);
				exit(1);
			}
			break;
		}
		
		if(len < sizeof(struct sadb_msg)) {
			fprintf(stderr, "%s:system error:pfkey_sig_handler: "
				"read returned only %d octets of a minimum of %d octets for the message header.\n",
				program_name,
				len, sizeof(struct sadb_msg));
			break;
		}
		
		fprintf(stdout, "%s:pfkey_sig_handler: "
			"read %d octets from pfkey_sock=%d.\n",
			program_name,
			len, pfkey_sock);
		
		pfkey_msg = (struct sadb_msg*)buffer;

		if(pfkey_msg->sadb_msg_version != PF_KEY_V2) {
			fprintf(stderr, "system error:pfkey_sig_handler: not PF_KEY_V2 msg.\n");
			break;
		}
		
		if(len != pfkey_msg->sadb_msg_len * IPSEC_PFKEYv2_ALIGN) {
			fprintf(stderr, "system error:pfkey_sig_handler: bogus msg len of %d, not %d byte aligned.\n",
				len, IPSEC_PFKEYv2_ALIGN);
			break;
		}
		
		/* XXX when this becomes a lib, keying daemons must be able to receive errors */
		if(pfkey_msg->sadb_msg_errno) {
			fprintf(stderr, "system error:pfkey_sig_handler: errno set to %d.\n",
				pfkey_msg->sadb_msg_errno);
			break;
		}
		
		/* check PID */
		if(pfkey_msg->sadb_msg_pid != getpid()) {
			fprintf(stderr, "system error:pfkey_sig_handler: pid (%d) does not equal originating process pid (%d).\n",
				pfkey_msg->sadb_msg_pid, getpid());
			break;
		}
		
		if(pfkey_msg->sadb_msg_seq != pfkey_seq) {
			fprintf(stderr, "system error:pfkey_sig_handler: seq (%d) does not equal original message seq (%d).\n",
				pfkey_msg->sadb_msg_seq, pfkey_seq);
			break;
		}
		
		if(pfkey_msg->sadb_msg_reserved) {
			fprintf(stderr, "system error:pfkey_sig_handler: reserved field must be zero, set to %d.\n",
				pfkey_msg->sadb_msg_reserved);
			break;
		}
		
		if((pfkey_msg->sadb_msg_type > SADB_MAX) || (!pfkey_msg->sadb_msg_type)){
			fprintf(stderr, "system error:pfkey_sig_handler: msg type too large or small:%d.\n",
				pfkey_msg->sadb_msg_type);
			break;
		}
		
		if((error = pfkey_msg_parse(pfkey_msg, NULL, extensions_parse, EXT_BITS_OUT))) {
			fprintf(stderr, "system error:pfkey_sig_handler: pfkey_msg_parse returns %d.\n",
				error);
		} else {
			fprintf(stdout, "%s:pfkey_sig_handler: return (msg would normally be sent for parsing).\n",
				program_name);
		}
		break;
	}
	return;
}
#endif /* SIGS_FROM_BELOW */

int
parse_life_options(uint32_t life[life_maxsever][life_maxtype],
		   char *life_opt[life_maxsever][life_maxtype],
		   char *optarg)
{
	char *optargp = optarg;
	char *endptr;
	
	do {
		int life_severity, life_type;
		char *optargt = optargp;
		
		if(strncmp(optargp, "soft", sizeof("soft")-1) == 0) {
			life_severity = life_soft;
			optargp += sizeof("soft")-1;
		} else if(strncmp(optargp, "hard", sizeof("hard")-1) == 0) {
			life_severity = life_hard;
			optargp += sizeof("hard")-1;
		} else {
			fprintf(stderr, "%s: missing lifetime severity in %s, optargt=%p, optargp=%p, sizeof(\"soft\")=%d\n",
				program_name, optargt, optargt, optargp, sizeof("soft"));
			usage(program_name, stderr);
			return(1);
		}
		if(debug) {
			fprintf(stdout, "%s: debug: life_severity=%d, optargt=%p=\"%s\", optargp=%p=\"%s\", sizeof(\"soft\")=%d\n",
				program_name, life_severity, optargt, optargt, optargp, optargp, sizeof("soft"));
		}
		if(*(optargp++) != '-') {
			fprintf(stderr, "%s: expected '-' after severity of lifetime parameter to --life option.\n",
				program_name);
			usage(program_name, stderr);
			return(1);
		}
		if(debug) {
			fprintf(stdout, "%s: debug: optargt=%p=\"%s\", optargp=%p=\"%s\", strlen(optargt)=%d, strlen(optargp)=%d, strncmp(optargp, \"addtime\", sizeof(\"addtime\")-1)=%d\n",
				program_name, optargt, optargt, optargp, optargp, strlen(optargt), strlen(optargp), strncmp(optargp, "addtime", sizeof("addtime")-1));
		}
		if(strncmp(optargp, "allocations", sizeof("allocations")-1) == 0) {
			life_type = life_alloc;
			optargp += sizeof("allocations")-1;
		} else if(strncmp(optargp, "bytes", sizeof("bytes")-1) == 0) {
			life_type = life_bytes;
			optargp += sizeof("bytes")-1;
		} else if(strncmp(optargp, "addtime", sizeof("addtime")-1) == 0) {
			life_type = life_addtime;
			optargp += sizeof("addtime")-1;
		} else if(strncmp(optargp, "usetime", sizeof("usetime")-1) == 0) {
			life_type = life_usetime;
			optargp += sizeof("usetime")-1;
		} else if(strncmp(optargp, "packets", sizeof("packets")-1) == 0) {
			life_type = life_packets;
			optargp += sizeof("packets")-1;
		} else {
			fprintf(stderr, "%s: missing lifetime type after '-' in %s\n",
				program_name, optargt);
			usage(program_name, stderr);
			return(1);
		}
		if(debug) {
			fprintf(stdout, "%s: debug: life_type=%d\n",
				program_name, life_type);
		}
		if(life_opt[life_severity][life_type] != NULL) {
			fprintf(stderr, "%s: Error, lifetime parameter redefined:%s, already defined as:%p\n",
				program_name, optargt, life_opt[life_severity][life_type]);
			return(1);
		}
		if(*(optargp++) != '=') {
			fprintf(stderr, "%s: expected '=' after type of lifetime parameter to --life option.\n",
				program_name);
			usage(program_name, stderr);
			return(1);
		}
		if(debug) {
			fprintf(stdout, "%s: debug: optargt=%p, optargt+strlen(optargt)=%p, optargp=%p, strlen(optargp)=%d\n",
				program_name, optargt, optargt+strlen(optargt), optargp, strlen(optargp));
		}
		if(strlen(optargp) == 0) {
			fprintf(stderr, "%s: expected value after '=' in --life option. optargt=%p, optargt+strlen(optargt)=%p, optargp=%p\n",
				program_name, optargt, optargt+strlen(optargt), optargp);
			usage(program_name, stderr);
			return(1);
		}
		life[life_severity][life_type] = strtoul(optargp, &endptr, 0);

		if(!((endptr == optargp + strlen(optargp)) || (endptr == optargp + strcspn(optargp, ", ")))) {
			fprintf(stderr, "%s: Invalid character='%c' at offset %d in lifetime option parameter: '%s', parameter string is %d characters long, %d valid value characters found.\n",
				program_name,
				*endptr, endptr - optarg, optarg, strlen(optarg), strcspn(optargp, ", ") - 1);
			return(1);
		}
		life_opt[life_severity][life_type] = optargt;
		if(debug) {
			fprintf(stdout, "%s lifetime %s set to %d.\n",
				program_name, optargt, life[life_severity][life_type]);
		}
		optargp=endptr+1;
	} while(*endptr==',' || isspace(*endptr));
	
	return(0);
}

int
pfkey_register(uint8_t satype) {
	/* for registering SA types that can be negotiated */
	int error = 0;
	struct sadb_ext *extensions[SADB_EXT_MAX + 1];
	struct sadb_msg *pfkey_msg;

	pfkey_extensions_init(extensions);
	if((error = pfkey_msg_hdr_build(&extensions[0],
					SADB_REGISTER,
					satype,
					0,