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-rw-r--r--src/openvpn/proxy.c907
1 files changed, 907 insertions, 0 deletions
diff --git a/src/openvpn/proxy.c b/src/openvpn/proxy.c
new file mode 100644
index 0000000..363d8a7
--- /dev/null
+++ b/src/openvpn/proxy.c
@@ -0,0 +1,907 @@
+/*
+ * OpenVPN -- An application to securely tunnel IP networks
+ * over a single TCP/UDP port, with support for SSL/TLS-based
+ * session authentication and key exchange,
+ * packet encryption, packet authentication, and
+ * packet compression.
+ *
+ * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#elif defined(_MSC_VER)
+#include "config-msvc.h"
+#endif
+
+#include "syshead.h"
+
+#include "common.h"
+#include "misc.h"
+#include "crypto.h"
+#include "win32.h"
+#include "socket.h"
+#include "fdmisc.h"
+#include "proxy.h"
+#include "base64.h"
+#include "httpdigest.h"
+#include "ntlm.h"
+#include "memdbg.h"
+
+#ifdef ENABLE_HTTP_PROXY
+
+#define UP_TYPE_PROXY "HTTP Proxy"
+
+struct http_proxy_options *
+init_http_proxy_options_once (struct http_proxy_options **hpo,
+ struct gc_arena *gc)
+{
+ if (!*hpo)
+ {
+ ALLOC_OBJ_CLEAR_GC (*hpo, struct http_proxy_options, gc);
+ /* http proxy defaults */
+ (*hpo)->timeout = 5;
+ (*hpo)->http_version = "1.0";
+ }
+ return *hpo;
+}
+
+
+/* cached proxy username/password */
+static struct user_pass static_proxy_user_pass;
+
+static bool
+recv_line (socket_descriptor_t sd,
+ char *buf,
+ int len,
+ const int timeout_sec,
+ const bool verbose,
+ struct buffer *lookahead,
+ volatile int *signal_received)
+{
+ struct buffer la;
+ int lastc = 0;
+
+ CLEAR (la);
+ if (lookahead)
+ la = *lookahead;
+
+ while (true)
+ {
+ int status;
+ ssize_t size;
+ fd_set reads;
+ struct timeval tv;
+ uint8_t c;
+
+ if (buf_defined (&la))
+ {
+ ASSERT (buf_init (&la, 0));
+ }
+
+ FD_ZERO (&reads);
+ FD_SET (sd, &reads);
+ tv.tv_sec = timeout_sec;
+ tv.tv_usec = 0;
+
+ status = select (sd + 1, &reads, NULL, NULL, &tv);
+
+ get_signal (signal_received);
+ if (*signal_received)
+ goto error;
+
+ /* timeout? */
+ if (status == 0)
+ {
+ if (verbose)
+ msg (D_LINK_ERRORS | M_ERRNO, "recv_line: TCP port read timeout expired");
+ goto error;
+ }
+
+ /* error */
+ if (status < 0)
+ {
+ if (verbose)
+ msg (D_LINK_ERRORS | M_ERRNO, "recv_line: TCP port read failed on select()");
+ goto error;
+ }
+
+ /* read single char */
+ size = recv (sd, &c, 1, MSG_NOSIGNAL);
+
+ /* error? */
+ if (size != 1)
+ {
+ if (verbose)
+ msg (D_LINK_ERRORS | M_ERRNO, "recv_line: TCP port read failed on recv()");
+ goto error;
+ }
+
+#if 0
+ if (isprint(c))
+ msg (M_INFO, "PROXY: read '%c' (%d)", c, (int)c);
+ else
+ msg (M_INFO, "PROXY: read (%d)", (int)c);
+#endif
+
+ /* store char in buffer */
+ if (len > 1)
+ {
+ *buf++ = c;
+ --len;
+ }
+
+ /* also store char in lookahead buffer */
+ if (buf_defined (&la))
+ {
+ buf_write_u8 (&la, c);
+ if (!isprint(c) && !isspace(c)) /* not ascii? */
+ {
+ if (verbose)
+ msg (D_LINK_ERRORS | M_ERRNO, "recv_line: Non-ASCII character (%d) read on recv()", (int)c);
+ *lookahead = la;
+ return false;
+ }
+ }
+
+ /* end of line? */
+ if (lastc == '\r' && c == '\n')
+ break;
+
+ lastc = c;
+ }
+
+ /* append trailing null */
+ if (len > 0)
+ *buf++ = '\0';
+
+ return true;
+
+ error:
+ return false;
+}
+
+static bool
+send_line (socket_descriptor_t sd,
+ const char *buf)
+{
+ const ssize_t size = send (sd, buf, strlen (buf), MSG_NOSIGNAL);
+ if (size != (ssize_t) strlen (buf))
+ {
+ msg (D_LINK_ERRORS | M_ERRNO, "send_line: TCP port write failed on send()");
+ return false;
+ }
+ return true;
+}
+
+static bool
+send_line_crlf (socket_descriptor_t sd,
+ const char *src)
+{
+ bool ret;
+
+ struct buffer buf = alloc_buf (strlen (src) + 3);
+ ASSERT (buf_write (&buf, src, strlen (src)));
+ ASSERT (buf_write (&buf, "\r\n", 3));
+ ret = send_line (sd, BSTR (&buf));
+ free_buf (&buf);
+ return ret;
+}
+
+static bool
+send_crlf (socket_descriptor_t sd)
+{
+ return send_line_crlf (sd, "");
+}
+
+uint8_t *
+make_base64_string2 (const uint8_t *str, int src_len, struct gc_arena *gc)
+{
+ uint8_t *ret = NULL;
+ char *b64out = NULL;
+ ASSERT (openvpn_base64_encode ((const void *)str, src_len, &b64out) >= 0);
+ ret = (uint8_t *) string_alloc (b64out, gc);
+ free (b64out);
+ return ret;
+}
+
+uint8_t *
+make_base64_string (const uint8_t *str, struct gc_arena *gc)
+{
+ return make_base64_string2 (str, strlen ((const char *)str), gc);
+}
+
+static const char *
+username_password_as_base64 (const struct http_proxy_info *p,
+ struct gc_arena *gc)
+{
+ struct buffer out = alloc_buf_gc (strlen (p->up.username) + strlen (p->up.password) + 2, gc);
+ ASSERT (strlen (p->up.username) > 0);
+ buf_printf (&out, "%s:%s", p->up.username, p->up.password);
+ return (const char *)make_base64_string ((const uint8_t*)BSTR (&out), gc);
+}
+
+static void
+get_user_pass_http (struct http_proxy_info *p, const bool force)
+{
+ if (!static_proxy_user_pass.defined || force)
+ {
+ unsigned int flags = GET_USER_PASS_MANAGEMENT;
+ if (p->queried_creds)
+ flags |= GET_USER_PASS_PREVIOUS_CREDS_FAILED;
+ get_user_pass (&static_proxy_user_pass,
+ p->options.auth_file,
+ UP_TYPE_PROXY,
+ flags);
+ p->queried_creds = true;
+ p->up = static_proxy_user_pass;
+ }
+}
+static void
+clear_user_pass_http (void)
+{
+ purge_user_pass (&static_proxy_user_pass, true);
+}
+
+static void
+dump_residual (socket_descriptor_t sd,
+ int timeout,
+ volatile int *signal_received)
+{
+ char buf[256];
+ while (true)
+ {
+ if (!recv_line (sd, buf, sizeof (buf), timeout, true, NULL, signal_received))
+ return;
+ chomp (buf);
+ msg (D_PROXY, "PROXY HEADER: '%s'", buf);
+ }
+}
+
+/*
+ * Extract the Proxy-Authenticate header from the stream.
+ * Consumes all headers.
+ */
+static int
+get_proxy_authenticate (socket_descriptor_t sd,
+ int timeout,
+ char **data,
+ struct gc_arena *gc,
+ volatile int *signal_received)
+{
+ char buf[256];
+ int ret = HTTP_AUTH_NONE;
+ while (true)
+ {
+ if (!recv_line (sd, buf, sizeof (buf), timeout, true, NULL, signal_received))
+ {
+ *data = NULL;
+ return HTTP_AUTH_NONE;
+ }
+ chomp (buf);
+ if (!strlen(buf))
+ return ret;
+ if (ret == HTTP_AUTH_NONE && !strncmp(buf, "Proxy-Authenticate: ", 20))
+ {
+ if (!strncmp(buf+20, "Basic ", 6))
+ {
+ msg (D_PROXY, "PROXY AUTH BASIC: '%s'", buf);
+ *data = string_alloc(buf+26, gc);
+ ret = HTTP_AUTH_BASIC;
+ }
+#if PROXY_DIGEST_AUTH
+ else if (!strncmp(buf+20, "Digest ", 7))
+ {
+ msg (D_PROXY, "PROXY AUTH DIGEST: '%s'", buf);
+ *data = string_alloc(buf+27, gc);
+ ret = HTTP_AUTH_DIGEST;
+ }
+#endif
+#if NTLM
+ else if (!strncmp(buf+20, "NTLM", 4))
+ {
+ msg (D_PROXY, "PROXY AUTH HTLM: '%s'", buf);
+ *data = NULL;
+ ret = HTTP_AUTH_NTLM;
+ }
+#endif
+ }
+ }
+}
+
+static void
+store_proxy_authenticate (struct http_proxy_info *p, char *data)
+{
+ if (p->proxy_authenticate)
+ free (p->proxy_authenticate);
+ p->proxy_authenticate = data;
+}
+
+/*
+ * Parse out key/value pairs from Proxy-Authenticate string.
+ * Return true on success, or false on parse failure.
+ */
+static bool
+get_key_value(const char *str, /* source string */
+ char *key, /* key stored here */
+ char *value, /* value stored here */
+ int max_key_len,
+ int max_value_len,
+ const char **endptr) /* next search position */
+{
+ int c;
+ bool starts_with_quote = false;
+ bool escape = false;
+
+ for (c = max_key_len-1; (*str && (*str != '=') && c--); )
+ *key++ = *str++;
+ *key = '\0';
+
+ if('=' != *str++)
+ /* no key/value found */
+ return false;
+
+ if('\"' == *str)
+ {
+ /* quoted string */
+ str++;
+ starts_with_quote = true;
+ }
+
+ for (c = max_value_len-1; *str && c--; str++)
+ {
+ switch (*str)
+ {
+ case '\\':
+ if (!escape)
+ {
+ /* possibly the start of an escaped quote */
+ escape = true;
+ *value++ = '\\'; /* even though this is an escape character, we still
+ store it as-is in the target buffer */
+ continue;
+ }
+ break;
+ case ',':
+ if (!starts_with_quote)
+ {
+ /* this signals the end of the value if we didn't get a starting quote
+ and then we do "sloppy" parsing */
+ c=0; /* the end */
+ continue;
+ }
+ break;
+ case '\r':
+ case '\n':
+ /* end of string */
+ c=0;
+ continue;
+ case '\"':
+ if (!escape && starts_with_quote)
+ {
+ /* end of string */
+ c=0;
+ continue;
+ }
+ break;
+ }
+ escape = false;
+ *value++ = *str;
+ }
+ *value = '\0';
+
+ *endptr = str;
+
+ return true; /* success */
+}
+
+static char *
+get_pa_var (const char *key, const char *pa, struct gc_arena *gc)
+{
+ char k[64];
+ char v[256];
+ const char *content = pa;
+
+ while (true)
+ {
+ const int status = get_key_value(content, k, v, sizeof(k), sizeof(v), &content);
+ if (status)
+ {
+ if (!strcmp(key, k))
+ return string_alloc(v, gc);
+ }
+ else
+ return NULL;
+
+ /* advance to start of next key */
+ if (*content == ',')
+ ++content;
+ while (*content && isspace(*content))
+ ++content;
+ }
+}
+
+struct http_proxy_info *
+http_proxy_new (const struct http_proxy_options *o)
+{
+ struct http_proxy_info *p;
+ struct http_proxy_options opt;
+
+ if (!o || !o->server)
+ msg (M_FATAL, "HTTP_PROXY: server not specified");
+
+ ASSERT (legal_ipv4_port (o->port));
+
+ ALLOC_OBJ_CLEAR (p, struct http_proxy_info);
+ p->options = *o;
+
+ /* parse authentication method */
+ p->auth_method = HTTP_AUTH_NONE;
+ if (o->auth_method_string)
+ {
+ if (!strcmp (o->auth_method_string, "none"))
+ p->auth_method = HTTP_AUTH_NONE;
+ else if (!strcmp (o->auth_method_string, "basic"))
+ p->auth_method = HTTP_AUTH_BASIC;
+#if NTLM
+ else if (!strcmp (o->auth_method_string, "ntlm"))
+ p->auth_method = HTTP_AUTH_NTLM;
+ else if (!strcmp (o->auth_method_string, "ntlm2"))
+ p->auth_method = HTTP_AUTH_NTLM2;
+#endif
+ else
+ msg (M_FATAL, "ERROR: unknown HTTP authentication method: '%s'",
+ o->auth_method_string);
+ }
+
+ /* only basic and NTLM/NTLMv2 authentication supported so far */
+ if (p->auth_method == HTTP_AUTH_BASIC || p->auth_method == HTTP_AUTH_NTLM || p->auth_method == HTTP_AUTH_NTLM2)
+ {
+ get_user_pass_http (p, true);
+ }
+
+#if !NTLM
+ if (p->auth_method == HTTP_AUTH_NTLM || p->auth_method == HTTP_AUTH_NTLM2)
+ msg (M_FATAL, "Sorry, this version of " PACKAGE_NAME " was built without NTLM Proxy support.");
+#endif
+
+ p->defined = true;
+ return p;
+}
+
+void
+http_proxy_close (struct http_proxy_info *hp)
+{
+ free (hp);
+}
+
+bool
+establish_http_proxy_passthru (struct http_proxy_info *p,
+ socket_descriptor_t sd, /* already open to proxy */
+ const char *host, /* openvpn server remote */
+ const int port, /* openvpn server port */
+ struct buffer *lookahead,
+ volatile int *signal_received)
+{
+ struct gc_arena gc = gc_new ();
+ char buf[512];
+ char buf2[128];
+ char get[80];
+ int status;
+ int nparms;
+ bool ret = false;
+ bool processed = false;
+
+ /* get user/pass if not previously given */
+ if (p->auth_method == HTTP_AUTH_BASIC
+ || p->auth_method == HTTP_AUTH_DIGEST
+ || p->auth_method == HTTP_AUTH_NTLM)
+ get_user_pass_http (p, false);
+
+ /* are we being called again after getting the digest server nonce in the previous transaction? */
+ if (p->auth_method == HTTP_AUTH_DIGEST && p->proxy_authenticate)
+ {
+ nparms = 1;
+ status = 407;
+ }
+ else
+ {
+ /* format HTTP CONNECT message */
+ openvpn_snprintf (buf, sizeof(buf), "CONNECT %s:%d HTTP/%s",
+ host,
+ port,
+ p->options.http_version);
+
+ msg (D_PROXY, "Send to HTTP proxy: '%s'", buf);
+
+ /* send HTTP CONNECT message to proxy */
+ if (!send_line_crlf (sd, buf))
+ goto error;
+
+ openvpn_snprintf(buf, sizeof(buf), "Host: %s", host);
+ if (!send_line_crlf(sd, buf))
+ goto error;
+
+ /* send User-Agent string if provided */
+ if (p->options.user_agent)
+ {
+ openvpn_snprintf (buf, sizeof(buf), "User-Agent: %s",
+ p->options.user_agent);
+ if (!send_line_crlf (sd, buf))
+ goto error;
+ }
+
+ /* auth specified? */
+ switch (p->auth_method)
+ {
+ case HTTP_AUTH_NONE:
+ break;
+
+ case HTTP_AUTH_BASIC:
+ openvpn_snprintf (buf, sizeof(buf), "Proxy-Authorization: Basic %s",
+ username_password_as_base64 (p, &gc));
+ msg (D_PROXY, "Attempting Basic Proxy-Authorization");
+ dmsg (D_SHOW_KEYS, "Send to HTTP proxy: '%s'", buf);
+ if (!send_line_crlf (sd, buf))
+ goto error;
+ break;
+
+#if NTLM
+ case HTTP_AUTH_NTLM:
+ case HTTP_AUTH_NTLM2:
+ /* keep-alive connection */
+ openvpn_snprintf (buf, sizeof(buf), "Proxy-Connection: Keep-Alive");
+ if (!send_line_crlf (sd, buf))
+ goto error;
+
+ openvpn_snprintf (buf, sizeof(buf), "Proxy-Authorization: NTLM %s",
+ ntlm_phase_1 (p, &gc));
+ msg (D_PROXY, "Attempting NTLM Proxy-Authorization phase 1");
+ dmsg (D_SHOW_KEYS, "Send to HTTP proxy: '%s'", buf);
+ if (!send_line_crlf (sd, buf))
+ goto error;
+ break;
+#endif
+
+ default:
+ ASSERT (0);
+ }
+
+ /* send empty CR, LF */
+ if (!send_crlf (sd))
+ goto error;
+
+ /* receive reply from proxy */
+ if (!recv_line (sd, buf, sizeof(buf), p->options.timeout, true, NULL, signal_received))
+ goto error;
+
+ /* remove trailing CR, LF */
+ chomp (buf);
+
+ msg (D_PROXY, "HTTP proxy returned: '%s'", buf);
+
+ /* parse return string */
+ nparms = sscanf (buf, "%*s %d", &status);
+
+ }
+
+ /* check for a "407 Proxy Authentication Required" response */
+ while (nparms >= 1 && status == 407)
+ {
+ msg (D_PROXY, "Proxy requires authentication");
+
+ if (p->auth_method == HTTP_AUTH_BASIC && !processed)
+ {
+ processed = true;
+ }
+ else if ((p->auth_method == HTTP_AUTH_NTLM || p->auth_method == HTTP_AUTH_NTLM2) && !processed) /* check for NTLM */
+ {
+#if NTLM
+ /* look for the phase 2 response */
+
+ while (true)
+ {
+ if (!recv_line (sd, buf, sizeof(buf), p->options.timeout, true, NULL, signal_received))
+ goto error;
+ chomp (buf);
+ msg (D_PROXY, "HTTP proxy returned: '%s'", buf);
+
+ openvpn_snprintf (get, sizeof get, "%%*s NTLM %%%ds", (int) sizeof (buf2) - 1);
+ nparms = sscanf (buf, get, buf2);
+ buf2[127] = 0; /* we only need the beginning - ensure it's null terminated. */
+
+ /* check for "Proxy-Authenticate: NTLM TlRM..." */
+ if (nparms == 1)
+ {
+ /* parse buf2 */
+ msg (D_PROXY, "auth string: '%s'", buf2);
+ break;
+ }
+ }
+ /* if we are here then auth string was got */
+ msg (D_PROXY, "Received NTLM Proxy-Authorization phase 2 response");
+
+ /* receive and discard everything else */
+ while (recv_line (sd, NULL, 0, 2, true, NULL, signal_received))
+ ;
+
+ /* now send the phase 3 reply */
+
+ /* format HTTP CONNECT message */
+ openvpn_snprintf (buf, sizeof(buf), "CONNECT %s:%d HTTP/%s",
+ host,
+ port,
+ p->options.http_version);
+
+ msg (D_PROXY, "Send to HTTP proxy: '%s'", buf);
+
+ /* send HTTP CONNECT message to proxy */
+ if (!send_line_crlf (sd, buf))
+ goto error;
+
+ /* keep-alive connection */
+ openvpn_snprintf (buf, sizeof(buf), "Proxy-Connection: Keep-Alive");
+ if (!send_line_crlf (sd, buf))
+ goto error;
+
+
+ /* send HOST etc, */
+ openvpn_snprintf (buf, sizeof(buf), "Host: %s", host);
+ msg (D_PROXY, "Send to HTTP proxy: '%s'", buf);
+ if (!send_line_crlf (sd, buf))
+ goto error;
+
+ msg (D_PROXY, "Attempting NTLM Proxy-Authorization phase 3");
+ {
+ const char *np3 = ntlm_phase_3 (p, buf2, &gc);
+ if (!np3)
+ {
+ msg (D_PROXY, "NTLM Proxy-Authorization phase 3 failed: received corrupted data from proxy server");
+ goto error;
+ }
+ openvpn_snprintf (buf, sizeof(buf), "Proxy-Authorization: NTLM %s", np3);
+ }
+
+ msg (D_PROXY, "Send to HTTP proxy: '%s'", buf);
+ if (!send_line_crlf (sd, buf))
+ goto error;
+ /* ok so far... */
+ /* send empty CR, LF */
+ if (!send_crlf (sd))
+ goto error;
+
+ /* receive reply from proxy */
+ if (!recv_line (sd, buf, sizeof(buf), p->options.timeout, true, NULL, signal_received))
+ goto error;
+
+ /* remove trailing CR, LF */
+ chomp (buf);
+
+ msg (D_PROXY, "HTTP proxy returned: '%s'", buf);
+
+ /* parse return string */
+ nparms = sscanf (buf, "%*s %d", &status);
+ processed = true;
+#endif
+ }
+#if PROXY_DIGEST_AUTH
+ else if (p->auth_method == HTTP_AUTH_DIGEST && !processed)
+ {
+ char *pa = p->proxy_authenticate;
+ const int method = p->auth_method;
+ ASSERT(pa);
+
+ if (method == HTTP_AUTH_DIGEST)
+ {
+ const char *http_method = "CONNECT";
+ const char *nonce_count = "00000001";
+ const char *qop = "auth";
+ const char *username = p->up.username;
+ const char *password = p->up.password;
+ char *opaque_kv = "";
+ char uri[128];
+ uint8_t cnonce_raw[8];
+ uint8_t *cnonce;
+ HASHHEX session_key;
+ HASHHEX response;
+
+ const char *realm = get_pa_var("realm", pa, &gc);
+ const char *nonce = get_pa_var("nonce", pa, &gc);
+ const char *algor = get_pa_var("algorithm", pa, &gc);
+ const char *opaque = get_pa_var("opaque", pa, &gc);
+
+ /* generate a client nonce */
+ ASSERT(rand_bytes(cnonce_raw, sizeof(cnonce_raw)));
+ cnonce = make_base64_string2(cnonce_raw, sizeof(cnonce_raw), &gc);
+
+
+ /* build the digest response */
+ openvpn_snprintf (uri, sizeof(uri), "%s:%d",
+ host,
+ port);
+
+ if (opaque)
+ {
+ const int len = strlen(opaque)+16;
+ opaque_kv = gc_malloc(len, false, &gc);
+ openvpn_snprintf (opaque_kv, len, ", opaque=\"%s\"", opaque);
+ }
+
+ DigestCalcHA1(algor,
+ username,
+ realm,
+ password,
+ nonce,
+ (char *)cnonce,
+ session_key);
+ DigestCalcResponse(session_key,
+ nonce,
+ nonce_count,
+ (char *)cnonce,
+ qop,
+ http_method,
+ uri,
+ NULL,
+ response);
+
+ /* format HTTP CONNECT message */
+ openvpn_snprintf (buf, sizeof(buf), "%s %s HTTP/%s",
+ http_method,
+ uri,
+ p->options.http_version);
+
+ msg (D_PROXY, "Send to HTTP proxy: '%s'", buf);
+
+ /* send HTTP CONNECT message to proxy */
+ if (!send_line_crlf (sd, buf))
+ goto error;
+
+ /* send HOST etc, */
+ openvpn_snprintf (buf, sizeof(buf), "Host: %s", host);
+ msg (D_PROXY, "Send to HTTP proxy: '%s'", buf);
+ if (!send_line_crlf (sd, buf))
+ goto error;
+
+ /* send digest response */
+ openvpn_snprintf (buf, sizeof(buf), "Proxy-Authorization: Digest username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", qop=%s, nc=%s, cnonce=\"%s\", response=\"%s\"%s",
+ username,
+ realm,
+ nonce,
+ uri,
+ qop,
+ nonce_count,
+ cnonce,
+ response,
+ opaque_kv
+ );
+ msg (D_PROXY, "Send to HTTP proxy: '%s'", buf);
+ if (!send_line_crlf (sd, buf))
+ goto error;
+ if (!send_crlf (sd))
+ goto error;
+
+ /* receive reply from proxy */
+ if (!recv_line (sd, buf, sizeof(buf), p->options.timeout, true, NULL, signal_received))
+ goto error;
+
+ /* remove trailing CR, LF */
+ chomp (buf);
+
+ msg (D_PROXY, "HTTP proxy returned: '%s'", buf);
+
+ /* parse return string */
+ nparms = sscanf (buf, "%*s %d", &status);
+ processed = true;
+ }
+ else
+ {
+ msg (D_PROXY, "HTTP proxy: digest method not supported");
+ goto error;
+ }
+ }
+#endif
+ else if (p->options.auth_retry)
+ {
+ /* figure out what kind of authentication the proxy needs */
+ char *pa = NULL;
+ const int method = get_proxy_authenticate(sd,
+ p->options.timeout,
+ &pa,
+ NULL,
+ signal_received);
+ if (method != HTTP_AUTH_NONE)
+ {
+ if (pa)
+ msg (D_PROXY, "HTTP proxy authenticate '%s'", pa);
+ if (p->options.auth_retry == PAR_NCT && method == HTTP_AUTH_BASIC)
+ {
+ msg (D_PROXY, "HTTP proxy: support for basic auth and other cleartext proxy auth methods is disabled");
+ goto error;
+ }
+ p->auth_method = method;
+ store_proxy_authenticate(p, pa);
+ ret = true;
+ goto done;
+ }
+ else
+ {
+ msg (D_PROXY, "HTTP proxy: do not recognize the authentication method required by proxy");
+ free (pa);
+ goto error;
+ }
+ }
+ else
+ {
+ if (!processed)
+ msg (D_PROXY, "HTTP proxy: no support for proxy authentication method");
+ goto error;
+ }
+
+ /* clear state */
+ if (p->options.auth_retry)
+ clear_user_pass_http();
+ store_proxy_authenticate(p, NULL);
+ }
+
+ /* check return code, success = 200 */
+ if (nparms < 1 || status != 200)
+ {
+ msg (D_LINK_ERRORS, "HTTP proxy returned bad status");
+#if 0
+ /* DEBUGGING -- show a multi-line HTTP error response */
+ dump_residual(sd, p->options.timeout, signal_received);
+#endif
+ goto error;
+ }
+
+ /* SUCCESS */
+
+ /* receive line from proxy and discard */
+ if (!recv_line (sd, NULL, 0, p->options.timeout, true, NULL, signal_received))
+ goto error;
+
+ /*
+ * Toss out any extraneous chars, but don't throw away the
+ * start of the OpenVPN data stream (put it in lookahead).
+ */
+ while (recv_line (sd, NULL, 0, 2, false, lookahead, signal_received))
+ ;
+
+ /* reset queried_creds so that we don't think that the next creds request is due to an auth error */
+ p->queried_creds = false;
+
+#if 0
+ if (lookahead && BLEN (lookahead))
+ msg (M_INFO, "HTTP PROXY: lookahead: %s", format_hex (BPTR (lookahead), BLEN (lookahead), 0));
+#endif
+
+ done:
+ gc_free (&gc);
+ return ret;
+
+ error:
+ /* on error, should we exit or restart? */
+ if (!*signal_received)
+ *signal_received = (p->options.retry ? SIGUSR1 : SIGTERM); /* SOFT-SIGUSR1 -- HTTP proxy error */
+ gc_free (&gc);
+ return ret;
+}
+
+#else
+static void dummy(void) {}
+#endif /* ENABLE_HTTP_PROXY */
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-03 14:02:15 +0000