Flatten all tags of the dist tree of netcat.

1 files changed, 326 insertions, 0 deletions

diff --git a/socks.c b/socks.c
new file mode 100644
index 000000000000..da7bd0c60e6d
--- /dev/null
+++ b/socks.c
@@ -0,0 +1,326 @@
+/*	$OpenBSD: socks.c,v 1.17 2006/09/25 04:51:20 ray Exp $	*/
+
+/*
+ * Copyright (c) 1999 Niklas Hallqvist.  All rights reserved.
+ * Copyright (c) 2004, 2005 Damien Miller.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <err.h>
+#include <errno.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <resolv.h>
+#include <readpassphrase.h>
+#include "atomicio.h"
+
+#define SOCKS_PORT	"1080"
+#define HTTP_PROXY_PORT	"3128"
+#define HTTP_MAXHDRS	64
+#define SOCKS_V5	5
+#define SOCKS_V4	4
+#define SOCKS_NOAUTH	0
+#define SOCKS_NOMETHOD	0xff
+#define SOCKS_CONNECT	1
+#define SOCKS_IPV4	1
+#define SOCKS_DOMAIN	3
+#define SOCKS_IPV6	4
+
+int	remote_connect(const char *, const char *, struct addrinfo);
+int	socks_connect(const char *, const char *, struct addrinfo,
+	    const char *, const char *, struct addrinfo, int,
+	    const char *);
+
+static int
+decode_addrport(const char *h, const char *p, struct sockaddr *addr,
+    socklen_t addrlen, int v4only, int numeric)
+{
+	int r;
+	struct addrinfo hints, *res;
+
+	bzero(&hints, sizeof(hints));
+	hints.ai_family = v4only ? PF_INET : PF_UNSPEC;
+	hints.ai_flags = numeric ? AI_NUMERICHOST : 0;
+	hints.ai_socktype = SOCK_STREAM;
+	r = getaddrinfo(h, p, &hints, &res);
+	/* Don't fatal when attempting to convert a numeric address */
+	if (r != 0) {
+		if (!numeric) {
+			errx(1, "getaddrinfo(\"%.64s\", \"%.64s\"): %s", h, p,
+			    gai_strerror(r));
+		}
+		return (-1);
+	}
+	if (addrlen < res->ai_addrlen) {
+		freeaddrinfo(res);
+		errx(1, "internal error: addrlen < res->ai_addrlen");
+	}
+	memcpy(addr, res->ai_addr, res->ai_addrlen);
+	freeaddrinfo(res);
+	return (0);
+}
+
+static int
+proxy_read_line(int fd, char *buf, size_t bufsz)
+{
+	size_t off;
+
+	for(off = 0;;) {
+		if (off >= bufsz)
+			errx(1, "proxy read too long");
+		if (atomicio(read, fd, buf + off, 1) != 1)
+			err(1, "proxy read");
+		/* Skip CR */
+		if (buf[off] == '\r')
+			continue;
+		if (buf[off] == '\n') {
+			buf[off] = '\0';
+			break;
+		}
+		off++;
+	}
+	return (off);
+}
+
+static const char *
+getproxypass(const char *proxyuser, const char *proxyhost)
+{
+	char prompt[512];
+	static char pw[256];
+
+	snprintf(prompt, sizeof(prompt), "Proxy password for %s@%s: ",
+	   proxyuser, proxyhost);
+	if (readpassphrase(prompt, pw, sizeof(pw), RPP_REQUIRE_TTY) == NULL)
+		errx(1, "Unable to read proxy passphrase");
+	return (pw);
+}
+
+int
+socks_connect(const char *host, const char *port,
+    struct addrinfo hints __attribute__ ((__unused__)),
+    const char *proxyhost, const char *proxyport, struct addrinfo proxyhints,
+    int socksv, const char *proxyuser)
+{
+	int proxyfd, r, authretry = 0;
+	size_t hlen, wlen;
+	unsigned char buf[1024];
+	size_t cnt;
+	struct sockaddr_storage addr;
+	struct sockaddr_in *in4 = (struct sockaddr_in *)&addr;
+	struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&addr;
+	in_port_t serverport;
+	const char *proxypass = NULL;
+
+	if (proxyport == NULL)
+		proxyport = (socksv == -1) ? HTTP_PROXY_PORT : SOCKS_PORT;
+
+	/* Abuse API to lookup port */
+	if (decode_addrport("0.0.0.0", port, (struct sockaddr *)&addr,
+	    sizeof(addr), 1, 1) == -1)
+		errx(1, "unknown port \"%.64s\"", port);
+	serverport = in4->sin_port;
+
+ again:
+	if (authretry++ > 3)
+		errx(1, "Too many authentication failures");
+
+	proxyfd = remote_connect(proxyhost, proxyport, proxyhints);
+
+	if (proxyfd < 0)
+		return (-1);
+
+	if (socksv == 5) {
+		if (decode_addrport(host, port, (struct sockaddr *)&addr,
+		    sizeof(addr), 0, 1) == -1)
+			addr.ss_family = 0; /* used in switch below */
+
+		/* Version 5, one method: no authentication */
+		buf[0] = SOCKS_V5;
+		buf[1] = 1;
+		buf[2] = SOCKS_NOAUTH;
+		cnt = atomicio(vwrite, proxyfd, buf, 3);
+		if (cnt != 3)
+			err(1, "write failed (%d/3)", cnt);
+
+		cnt = atomicio(read, proxyfd, buf, 2);
+		if (cnt != 2)
+			err(1, "read failed (%d/3)", cnt);
+
+		if (buf[1] == SOCKS_NOMETHOD)
+			errx(1, "authentication method negotiation failed");
+
+		switch (addr.ss_family) {
+		case 0:
+			/* Version 5, connect: domain name */
+
+			/* Max domain name length is 255 bytes */
+			hlen = strlen(host);
+			if (hlen > 255)
+				errx(1, "host name too long for SOCKS5");
+			buf[0] = SOCKS_V5;
+			buf[1] = SOCKS_CONNECT;
+			buf[2] = 0;
+			buf[3] = SOCKS_DOMAIN;
+			buf[4] = hlen;
+			memcpy(buf + 5, host, hlen);			
+			memcpy(buf + 5 + hlen, &serverport, sizeof serverport);
+			wlen = 7 + hlen;
+			break;
+		case AF_INET:
+			/* Version 5, connect: IPv4 address */
+			buf[0] = SOCKS_V5;
+			buf[1] = SOCKS_CONNECT;
+			buf[2] = 0;
+			buf[3] = SOCKS_IPV4;
+			memcpy(buf + 4, &in4->sin_addr, sizeof in4->sin_addr);
+			memcpy(buf + 8, &in4->sin_port, sizeof in4->sin_port);
+			wlen = 10;
+			break;
+		case AF_INET6:
+			/* Version 5, connect: IPv6 address */
+			buf[0] = SOCKS_V5;
+			buf[1] = SOCKS_CONNECT;
+			buf[2] = 0;
+			buf[3] = SOCKS_IPV6;
+			memcpy(buf + 4, &in6->sin6_addr, sizeof in6->sin6_addr);
+			memcpy(buf + 20, &in6->sin6_port,
+			    sizeof in6->sin6_port);
+			wlen = 22;
+			break;
+		default:
+			errx(1, "internal error: silly AF");
+		}
+
+		cnt = atomicio(vwrite, proxyfd, buf, wlen);
+		if (cnt != wlen)
+			err(1, "write failed (%d/%d)", cnt, wlen);
+
+		cnt = atomicio(read, proxyfd, buf, 10);
+		if (cnt != 10)
+			err(1, "read failed (%d/10)", cnt);
+		if (buf[1] != 0)
+			errx(1, "connection failed, SOCKS error %d", buf[1]);
+	} else if (socksv == 4) {
+		/* This will exit on lookup failure */
+		decode_addrport(host, port, (struct sockaddr *)&addr,
+		    sizeof(addr), 1, 0);
+
+		/* Version 4 */
+		buf[0] = SOCKS_V4;
+		buf[1] = SOCKS_CONNECT;	/* connect */
+		memcpy(buf + 2, &in4->sin_port, sizeof in4->sin_port);
+		memcpy(buf + 4, &in4->sin_addr, sizeof in4->sin_addr);
+		buf[8] = 0;	/* empty username */
+		wlen = 9;
+
+		cnt = atomicio(vwrite, proxyfd, buf, wlen);
+		if (cnt != wlen)
+			err(1, "write failed (%d/%d)", cnt, wlen);
+
+		cnt = atomicio(read, proxyfd, buf, 8);
+		if (cnt != 8)
+			err(1, "read failed (%d/8)", cnt);
+		if (buf[1] != 90)
+			errx(1, "connection failed, SOCKS error %d", buf[1]);
+	} else if (socksv == -1) {
+		/* HTTP proxy CONNECT */
+
+		/* Disallow bad chars in hostname */
+		if (strcspn(host, "\r\n\t []:") != strlen(host))
+			errx(1, "Invalid hostname");
+
+		/* Try to be sane about numeric IPv6 addresses */
+		if (strchr(host, ':') != NULL) {
+			r = snprintf(buf, sizeof(buf),
+			    "CONNECT [%s]:%d HTTP/1.0\r\n",
+			    host, ntohs(serverport));
+		} else {
+			r = snprintf(buf, sizeof(buf),
+			    "CONNECT %s:%d HTTP/1.0\r\n",
+			    host, ntohs(serverport));
+		}
+		if (r == -1 || (size_t)r >= sizeof(buf))
+			errx(1, "hostname too long");
+		r = strlen(buf);
+
+		cnt = atomicio(vwrite, proxyfd, buf, r);
+		if (cnt != r)
+			err(1, "write failed (%d/%d)", cnt, r);
+
+		if (authretry > 1) {
+			char resp[1024];
+
+			proxypass = getproxypass(proxyuser, proxyhost);
+			r = snprintf(buf, sizeof(buf), "%s:%s",
+			    proxyuser, proxypass);
+			if (r == -1 || (size_t)r >= sizeof(buf) ||
+			    b64_ntop(buf, strlen(buf), resp,
+			    sizeof(resp)) == -1)
+				errx(1, "Proxy username/password too long");
+			r = snprintf(buf, sizeof(buf), "Proxy-Authorization: "
+			    "Basic %s\r\n", resp);
+			if (r == -1 || (size_t)r >= sizeof(buf))
+				errx(1, "Proxy auth response too long");
+			r = strlen(buf);
+			if ((cnt = atomicio(vwrite, proxyfd, buf, r)) != r)
+				err(1, "write failed (%d/%d)", cnt, r);
+		}
+
+		/* Terminate headers */
+		if ((r = atomicio(vwrite, proxyfd, "\r\n", 2)) != 2)
+			err(1, "write failed (2/%d)", r);
+
+		/* Read status reply */
+		proxy_read_line(proxyfd, buf, sizeof(buf));
+		if (proxyuser != NULL &&
+		    strncmp(buf, "HTTP/1.0 407 ", 12) == 0) {
+			if (authretry > 1) {
+				fprintf(stderr, "Proxy authentication "
+				    "failed\n");
+			}
+			close(proxyfd);
+			goto again;
+		} else if (strncmp(buf, "HTTP/1.0 200 ", 12) != 0 &&
+		    strncmp(buf, "HTTP/1.1 200 ", 12) != 0)
+			errx(1, "Proxy error: \"%s\"", buf);
+
+		/* Headers continue until we hit an empty line */
+		for (r = 0; r < HTTP_MAXHDRS; r++) {
+			proxy_read_line(proxyfd, buf, sizeof(buf));
+			if (*buf == '\0')
+				break;
+		}
+		if (*buf != '\0')
+			errx(1, "Too many proxy headers received");
+	} else
+		errx(1, "Unknown proxy protocol %d", socksv);
+
+	return (proxyfd);
+}