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http.c
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http.c
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/*
* OpenConnect (SSL + DTLS) VPN client
*
* Copyright © 2008-2015 Intel Corporation.
* Copyright © 2008 Nick Andrew <[email protected]>
*
* Author: David Woodhouse <[email protected]>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1, 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
* Lesser General Public License for more details.
*/
#include <config.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <libxml/uri.h>
#include "openconnect-internal.h"
static int proxy_write(struct openconnect_info *vpninfo, char *buf, size_t len);
static int proxy_read(struct openconnect_info *vpninfo, char *buf, size_t len);
#define BUF_CHUNK_SIZE 4096
struct oc_text_buf *buf_alloc(void)
{
return calloc(1, sizeof(struct oc_text_buf));
}
void buf_append_urlencoded(struct oc_text_buf *buf, const char *str)
{
while (str && *str) {
unsigned char c = *str;
if (c < 0x80 && (isalnum((int)(c)) || c=='-' || c=='_' || c=='.' || c=='~'))
buf_append_bytes(buf, str, 1);
else
buf_append(buf, "%%%02x", c);
str++;
}
}
void buf_append_xmlescaped(struct oc_text_buf *buf, const char *str)
{
while (str && *str) {
unsigned char c = *str;
if (c=='<' || c=='>' || c=='&' || c=='"' || c=='\'')
buf_append(buf, "&#x%02x;", c);
else
buf_append_bytes(buf, str, 1);
str++;
}
}
void buf_append_hex(struct oc_text_buf *buf, const void *str, unsigned len)
{
const unsigned char *data = str;
unsigned i;
for (i = 0; i < len; i++)
buf_append(buf, "%02x", (unsigned)data[i]);
}
void buf_truncate(struct oc_text_buf *buf)
{
if (!buf)
return;
if (buf->data)
memset(buf->data, 0, buf->pos);
buf->pos = 0;
}
int buf_ensure_space(struct oc_text_buf *buf, int len)
{
unsigned int new_buf_len;
new_buf_len = (buf->pos + len + BUF_CHUNK_SIZE - 1) & ~(BUF_CHUNK_SIZE - 1);
if (new_buf_len <= buf->buf_len)
return 0;
if (new_buf_len > INT_MAX) {
buf->error = -E2BIG;
return buf->error;
} else {
realloc_inplace(buf->data, new_buf_len);
if (!buf->data)
buf->error = -ENOMEM;
else
buf->buf_len = new_buf_len;
}
return buf->error;
}
void __attribute__ ((format (printf, 2, 3)))
buf_append(struct oc_text_buf *buf, const char *fmt, ...)
{
va_list ap;
if (!buf || buf->error)
return;
if (buf_ensure_space(buf, 1))
return;
while (1) {
int max_len = buf->buf_len - buf->pos, ret;
va_start(ap, fmt);
ret = vsnprintf(buf->data + buf->pos, max_len, fmt, ap);
va_end(ap);
if (ret < 0) {
buf->error = -EIO;
break;
} else if (ret < max_len) {
buf->pos += ret;
break;
} else if (buf_ensure_space(buf, ret))
break;
}
}
void buf_append_bytes(struct oc_text_buf *buf, const void *bytes, int len)
{
if (!buf || buf->error)
return;
if (buf_ensure_space(buf, len + 1))
return;
memcpy(buf->data + buf->pos, bytes, len);
buf->pos += len;
buf->data[buf->pos] = 0;
}
void buf_append_from_utf16le(struct oc_text_buf *buf, const void *_utf16)
{
const unsigned char *utf16 = _utf16;
unsigned char utf8[4];
int c;
if (!utf16)
return;
while (utf16[0] || utf16[1]) {
if ((utf16[1] & 0xfc) == 0xd8 && (utf16[3] & 0xfc) == 0xdc) {
c = ((load_le16(utf16) & 0x3ff) << 10)|
(load_le16(utf16 + 2) & 0x3ff);
c += 0x10000;
utf16 += 4;
} else {
c = load_le16(utf16);
utf16 += 2;
}
if (c < 0x80) {
utf8[0] = c;
buf_append_bytes(buf, utf8, 1);
} else if (c < 0x800) {
utf8[0] = 0xc0 | (c >> 6);
utf8[1] = 0x80 | (c & 0x3f);
buf_append_bytes(buf, utf8, 2);
} else if (c < 0x10000) {
utf8[0] = 0xe0 | (c >> 12);
utf8[1] = 0x80 | ((c >> 6) & 0x3f);
utf8[2] = 0x80 | (c & 0x3f);
buf_append_bytes(buf, utf8, 3);
} else {
utf8[0] = 0xf0 | (c >> 18);
utf8[1] = 0x80 | ((c >> 12) & 0x3f);
utf8[2] = 0x80 | ((c >> 6) & 0x3f);
utf8[3] = 0x80 | (c & 0x3f);
buf_append_bytes(buf, utf8, 4);
}
}
utf8[0] = 0;
buf_append_bytes(buf, utf8, 1);
}
int get_utf8char(const char **p)
{
const char *utf8 = *p;
unsigned char c;
int utfchar, nr_extra, min;
c = *(utf8++);
if (c < 128) {
utfchar = c;
nr_extra = 0;
min = 0;
} else if ((c & 0xe0) == 0xc0) {
utfchar = c & 0x1f;
nr_extra = 1;
min = 0x80;
} else if ((c & 0xf0) == 0xe0) {
utfchar = c & 0x0f;
nr_extra = 2;
min = 0x800;
} else if ((c & 0xf8) == 0xf0) {
utfchar = c & 0x07;
nr_extra = 3;
min = 0x10000;
} else {
return -EILSEQ;
}
while (nr_extra--) {
c = *(utf8++);
if ((c & 0xc0) != 0x80)
return -EILSEQ;
utfchar <<= 6;
utfchar |= (c & 0x3f);
}
if (utfchar > 0x10ffff || utfchar < min)
return -EILSEQ;
*p = utf8;
return utfchar;
}
int buf_append_utf16le(struct oc_text_buf *buf, const char *utf8)
{
int utfchar, len = 0;
/* Ick. Now I'm implementing my own UTF8 handling too. Perhaps it's
time to bite the bullet and start requiring something like glib? */
while (*utf8) {
utfchar = get_utf8char(&utf8);
if (utfchar < 0) {
if (buf)
buf->error = utfchar;
return utfchar;
}
if (!buf)
continue;
if (utfchar >= 0x10000) {
utfchar -= 0x10000;
if (buf_ensure_space(buf, 4))
return buf_error(buf);
store_le16(buf->data + buf->pos, (utfchar >> 10) | 0xd800);
store_le16(buf->data + buf->pos + 2, (utfchar & 0x3ff) | 0xdc00);
buf->pos += 4;
len += 4;
} else {
if (buf_ensure_space(buf, 2))
return buf_error(buf);
store_le16(buf->data + buf->pos, utfchar);
buf->pos += 2;
len += 2;
}
}
/* We were only being used for validation */
if (!buf)
return 0;
/* Ensure UTF16 is NUL-terminated */
if (buf_ensure_space(buf, 2))
return buf_error(buf);
buf->data[buf->pos] = buf->data[buf->pos + 1] = 0;
return len;
}
int buf_error(struct oc_text_buf *buf)
{
return buf ? buf->error : -ENOMEM;
}
int buf_free(struct oc_text_buf *buf)
{
int error = buf_error(buf);
if (buf) {
buf_truncate(buf);
if (buf->data)
free(buf->data);
free(buf);
}
return error;
}
/*
* We didn't really want to have to do this for ourselves -- one might have
* thought that it would be available in a library somewhere. But neither
* cURL nor Neon have reliable cross-platform ways of either using a cert
* from the TPM, or just reading from / writing to a transport which is
* provided by their caller.
*/
int http_add_cookie(struct openconnect_info *vpninfo, const char *option,
const char *value, int replace)
{
struct oc_vpn_option *new, **this;
if (*value) {
new = malloc(sizeof(*new));
if (!new) {
vpn_progress(vpninfo, PRG_ERR,
_("No memory for allocating cookies\n"));
return -ENOMEM;
}
new->next = NULL;
new->option = strdup(option);
new->value = strdup(value);
if (!new->option || !new->value) {
free(new->option);
free(new->value);
free(new);
return -ENOMEM;
}
} else {
/* Kill cookie; don't replace it */
new = NULL;
/* This would be meaningless */
if (!replace)
return -EINVAL;
}
for (this = &vpninfo->cookies; *this; this = &(*this)->next) {
if (!strcmp(option, (*this)->option)) {
if (!replace) {
free(new->value);
free(new->option);
free(new);
return 0;
}
/* Replace existing cookie */
if (new)
new->next = (*this)->next;
else
new = (*this)->next;
free((*this)->option);
free((*this)->value);
free(*this);
*this = new;
break;
}
}
if (new && !*this) {
*this = new;
new->next = NULL;
}
return 0;
}
/* Read one HTTP header line into hdrbuf, potentially allowing for
* continuation lines. Will never leave a character in 'nextchar' when
* an empty line (signifying end of headers) is received. Will only
* return success when hdrbuf is valid. */
static int read_http_header(struct openconnect_info *vpninfo, char *nextchar,
struct oc_text_buf *hdrbuf, int allow_cont)
{
int eol = 0;
int ret;
char c;
buf_truncate(hdrbuf);
c = *nextchar;
if (c) {
*nextchar = 0;
goto skip_first;
}
while (1) {
ret = vpninfo->ssl_read(vpninfo, &c, 1);
if (ret < 0)
return ret;
if (ret != 1)
return -EINVAL;
/* If we were looking for a continuation line and didn't get it,
* stash the character we *did* get into *nextchar for next time. */
if (eol && c != ' ' && c != '\t') {
*nextchar = c;
return buf_error(hdrbuf);
}
eol = 0;
skip_first:
if (c == '\n') {
if (!buf_error(hdrbuf) && hdrbuf->pos &&
hdrbuf->data[hdrbuf->pos - 1] == '\r') {
hdrbuf->pos--;
hdrbuf->data[hdrbuf->pos] = 0;
}
/* For a non-empty header line, see if there's a continuation */
if (allow_cont && hdrbuf->pos) {
eol = 1;
continue;
}
return buf_error(hdrbuf);
}
buf_append_bytes(hdrbuf, &c, 1);
}
return buf_error(hdrbuf);
}
#define BODY_HTTP10 -1
#define BODY_CHUNKED -2
int process_http_response(struct openconnect_info *vpninfo, int connect,
int (*header_cb)(struct openconnect_info *, char *, char *),
struct oc_text_buf *body)
{
struct oc_text_buf *hdrbuf = buf_alloc();
char nextchar = 0;
int bodylen = BODY_HTTP10;
int closeconn = 0;
int result;
int ret = -EINVAL;
int i;
buf_truncate(body);
cont:
ret = read_http_header(vpninfo, &nextchar, hdrbuf, 0);
if (ret) {
vpn_progress(vpninfo, PRG_ERR, _("Error reading HTTP response: %s\n"),
strerror(ret));
goto err;
}
if (!strncmp(hdrbuf->data, "HTTP/1.0 ", 9))
closeconn = 1;
if ((!closeconn && strncmp(hdrbuf->data, "HTTP/1.1 ", 9)) ||
!(result = atoi(hdrbuf->data + 9))) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to parse HTTP response '%s'\n"), hdrbuf->data);
ret = -EINVAL;
goto err;
}
vpn_progress(vpninfo, (result == 200 || result == 407) ? PRG_DEBUG : PRG_INFO,
_("Got HTTP response: %s\n"), hdrbuf->data);
/* Eat headers... */
while (1) {
char *colon;
char *hdrline;
ret = read_http_header(vpninfo, &nextchar, hdrbuf, 1);
if (ret) {
vpn_progress(vpninfo, PRG_ERR, _("Error reading HTTP response: %s\n"),
strerror(ret));
goto err;
}
/* Default error case */
ret = -EINVAL;
/* Empty line ends headers */
if (!hdrbuf->pos)
break;
hdrline = hdrbuf->data;
colon = strchr(hdrline, ':');
if (!colon) {
vpn_progress(vpninfo, PRG_ERR,
_("Ignoring unknown HTTP response line '%s'\n"), hdrline);
continue;
}
*(colon++) = 0;
if (*colon == ' ')
colon++;
/* Handle Set-Cookie first so that we can avoid printing the
webvpn cookie in the verbose debug output */
if (!strcasecmp(hdrline, "Set-Cookie")) {
char *semicolon = strchr(colon, ';');
const char *print_equals;
char *equals = strchr(colon, '=');
if (semicolon)
*semicolon = 0;
if (!equals) {
vpn_progress(vpninfo, PRG_ERR,
_("Invalid cookie offered: %s\n"), hdrline);
ret = -EINVAL;
goto err;
}
*(equals++) = 0;
print_equals = equals;
/* Don't print the webvpn cookie unless it's empty; we don't
want people posting it in public with debugging output */
if (!strcmp(colon, "webvpn") && *equals)
print_equals = _("<elided>");
vpn_progress(vpninfo, PRG_DEBUG, "%s: %s=%s%s%s\n",
hdrline, colon, print_equals, semicolon ? ";" : "",
semicolon ? (semicolon+1) : "");
/* The server tends to ask for the username and password as
usual, even if we've already failed because it didn't like
our cert. Thankfully it does give us this hint... */
if (!strcmp(colon, "ClientCertAuthFailed"))
vpn_progress(vpninfo, PRG_ERR,
_("SSL certificate authentication failed\n"));
ret = http_add_cookie(vpninfo, colon, equals, 1);
if (ret)
goto err;
} else {
vpn_progress(vpninfo, PRG_DEBUG, "%s: %s\n", hdrline, colon);
}
if (!strcasecmp(hdrline, "Connection")) {
if (!strcasecmp(colon, "Close"))
closeconn = 1;
#if 0
/* This might seem reasonable, but in fact it breaks
certificate authentication with some servers. If
they give an HTTP/1.0 response, even if they
explicitly give a Connection: Keep-Alive header,
just close the connection. */
else if (!strcasecmp(colon, "Keep-Alive"))
closeconn = 0;
#endif
}
if (!strcasecmp(hdrline, "Location")) {
vpninfo->redirect_url = strdup(colon);
if (!vpninfo->redirect_url) {
ret = -ENOMEM;
goto err;
}
}
if (!strcasecmp(hdrline, "Content-Length")) {
bodylen = atoi(colon);
if (bodylen < 0) {
vpn_progress(vpninfo, PRG_ERR,
_("Response body has negative size (%d)\n"),
bodylen);
ret = -EINVAL;
goto err;
}
}
if (!strcasecmp(hdrline, "Transfer-Encoding")) {
if (!strcasecmp(colon, "chunked"))
bodylen = BODY_CHUNKED;
else {
vpn_progress(vpninfo, PRG_ERR,
_("Unknown Transfer-Encoding: %s\n"),
colon);
ret = -EINVAL;
goto err;
}
}
if (header_cb)
header_cb(vpninfo, hdrline, colon);
}
/* Handle 'HTTP/1.1 100 Continue'. Not that we should ever see it */
if (result == 100)
goto cont;
/* On successful CONNECT or upgrade, there is no body. Return success */
if (connect && (result == 200 || result == 101)) {
buf_free(hdrbuf);
return result;
}
/* Now the body, if there is one */
vpn_progress(vpninfo, PRG_DEBUG, _("HTTP body %s (%d)\n"),
bodylen == BODY_HTTP10 ? "http 1.0" :
bodylen == BODY_CHUNKED ? "chunked" : "length: ",
bodylen);
/* If we were given Content-Length, it's nice and easy... */
if (bodylen > 0) {
if (buf_ensure_space(body, bodylen + 1)) {
ret = buf_error(body);
goto err;
}
while (body->pos < bodylen) {
i = vpninfo->ssl_read(vpninfo, body->data + body->pos, bodylen - body->pos);
if (i < 0) {
vpn_progress(vpninfo, PRG_ERR,
_("Error reading HTTP response body\n"));
ret = i;
goto err;
}
body->pos += i;
}
} else if (bodylen == BODY_CHUNKED) {
char clen_buf[16];
/* ... else, chunked */
while ((i = vpninfo->ssl_gets(vpninfo, clen_buf, sizeof(clen_buf)))) {
int lastchunk = 0;
long chunklen;
if (i < 0) {
vpn_progress(vpninfo, PRG_ERR,
_("Error fetching chunk header\n"));
ret = i;
goto err;
}
chunklen = strtol(clen_buf, NULL, 16);
if (!chunklen) {
lastchunk = 1;
goto skip;
}
if (chunklen < 0) {
vpn_progress(vpninfo, PRG_ERR,
_("HTTP chunk length is negative (%ld)\n"), chunklen);
ret = -EINVAL;
goto err;
}
if (chunklen >= INT_MAX) {
vpn_progress(vpninfo, PRG_ERR,
_("HTTP chunk length is too large (%ld)\n"), chunklen);
ret = -EINVAL;
goto err;
}
if (buf_ensure_space(body, chunklen + 1)) {
ret = buf_error(body);
goto err;
}
while (chunklen) {
i = vpninfo->ssl_read(vpninfo, body->data + body->pos, chunklen);
if (i < 0) {
vpn_progress(vpninfo, PRG_ERR,
_("Error reading HTTP response body\n"));
ret = i;
goto err;
}
chunklen -= i;
body->pos += i;
}
skip:
if ((i = vpninfo->ssl_gets(vpninfo, clen_buf, sizeof(clen_buf)))) {
if (i < 0) {
vpn_progress(vpninfo, PRG_ERR,
_("Error fetching HTTP response body\n"));
ret = i;
} else {
vpn_progress(vpninfo, PRG_ERR,
_("Error in chunked decoding. Expected '', got: '%s'"),
clen_buf);
ret = -EINVAL;
}
goto err;
}
if (lastchunk)
break;
}
} else if (bodylen == BODY_HTTP10) {
if (!closeconn) {
vpn_progress(vpninfo, PRG_ERR,
_("Cannot receive HTTP 1.0 body without closing connection\n"));
openconnect_close_https(vpninfo, 0);
return -EINVAL;
}
/* HTTP 1.0 response. Just eat all we can in 4KiB chunks */
while (1) {
if (buf_ensure_space(body, 4096 + 1)) {
ret = buf_error(body);
goto err;
}
i = vpninfo->ssl_read(vpninfo, body->data + body->pos, 4096);
if (i < 0) {
/* Error */
ret = i;
goto err;
} else if (!i)
break;
/* Got more data */
body->pos += i;
}
}
body->data[body->pos] = 0;
ret = result;
if (closeconn || vpninfo->no_http_keepalive) {
err:
openconnect_close_https(vpninfo, 0);
}
buf_free(hdrbuf);
return result;
}
int internal_parse_url(const char *url, char **res_proto, char **res_host,
int *res_port, char **res_path, int default_port)
{
const char *orig_host, *orig_path;
char *host, *port_str;
int port, proto_len = 0;
orig_host = strstr(url, "://");
if (orig_host) {
proto_len = orig_host - url;
orig_host += 3;
if (strprefix_match(url, proto_len, "https"))
port = 443;
else if (strprefix_match(url, proto_len, "http"))
port = 80;
else if (strprefix_match(url, proto_len, "socks") ||
strprefix_match(url, proto_len, "socks4") ||
strprefix_match(url, proto_len, "socks5"))
port = 1080;
else
return -EPROTONOSUPPORT;
} else {
if (default_port) {
port = default_port;
orig_host = url;
} else
return -EINVAL;
}
orig_path = strchr(orig_host, '/');
if (orig_path) {
host = strndup(orig_host, orig_path - orig_host);
orig_path++;
} else
host = strdup(orig_host);
if (!host)
return -ENOMEM;
port_str = strrchr(host, ':');
if (port_str) {
char *end;
int new_port = strtol(port_str + 1, &end, 10);
if (!*end) {
*port_str = 0;
port = new_port;
}
}
if (res_proto)
*res_proto = proto_len ? strndup(url, proto_len) : NULL;
if (res_host)
*res_host = host;
else
free(host);
if (res_port)
*res_port = port;
if (res_path)
*res_path = (orig_path && *orig_path) ? strdup(orig_path) : NULL;
return 0;
}
void openconnect_clear_cookies(struct openconnect_info *vpninfo)
{
struct oc_vpn_option *opt, *next;
for (opt = vpninfo->cookies; opt; opt = next) {
next = opt->next;
free(opt->option);
free(opt->value);
free(opt);
}
vpninfo->cookies = NULL;
}
/* Return value:
* < 0, on error
* = 0, on success (go ahead and retry with the latest vpninfo->{hostname,urlpath,port,...})
*/
int handle_redirect(struct openconnect_info *vpninfo)
{
vpninfo->redirect_type = REDIR_TYPE_LOCAL;
if (!strncmp(vpninfo->redirect_url, "https://", 8)) {
/* New host. Tear down the existing connection and make a new one */
char *host;
int port;
int ret;
free(vpninfo->urlpath);
vpninfo->urlpath = NULL;
ret = internal_parse_url(vpninfo->redirect_url, NULL, &host, &port, &vpninfo->urlpath, 0);
if (ret) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to parse redirected URL '%s': %s\n"),
vpninfo->redirect_url, strerror(-ret));
free(vpninfo->redirect_url);
vpninfo->redirect_url = NULL;
return ret;
}
if (strcasecmp(vpninfo->hostname, host) || port != vpninfo->port) {
openconnect_set_hostname(vpninfo, host);
vpninfo->port = port;
/* Kill the existing connection, and a new one will happen */
openconnect_close_https(vpninfo, 0);
openconnect_clear_cookies(vpninfo);
vpninfo->redirect_type = REDIR_TYPE_NEWHOST;
}
free(host);
free(vpninfo->redirect_url);
vpninfo->redirect_url = NULL;
return 0;
} else if (strstr(vpninfo->redirect_url, "://")) {
vpn_progress(vpninfo, PRG_ERR,
_("Cannot follow redirection to non-https URL '%s'\n"),
vpninfo->redirect_url);
free(vpninfo->redirect_url);
vpninfo->redirect_url = NULL;
return -EINVAL;
} else if (vpninfo->redirect_url[0] == '/') {
/* Absolute redirect within same host */
free(vpninfo->urlpath);
vpninfo->urlpath = strdup(vpninfo->redirect_url + 1);
free(vpninfo->redirect_url);
vpninfo->redirect_url = NULL;
return 0;
} else {
char *lastslash = NULL;
if (vpninfo->urlpath)
lastslash = strrchr(vpninfo->urlpath, '/');
if (!lastslash) {
free(vpninfo->urlpath);
vpninfo->urlpath = vpninfo->redirect_url;
vpninfo->redirect_url = NULL;
} else {
char *oldurl = vpninfo->urlpath;
*lastslash = 0;
vpninfo->urlpath = NULL;
if (asprintf(&vpninfo->urlpath, "%s/%s",
oldurl, vpninfo->redirect_url) == -1) {
int err = -errno;
vpn_progress(vpninfo, PRG_ERR,
_("Allocating new path for relative redirect failed: %s\n"),
strerror(-err));
return err;
}
free(oldurl);
free(vpninfo->redirect_url);
vpninfo->redirect_url = NULL;
}
return 0;
}
}
void dump_buf(struct openconnect_info *vpninfo, char prefix, char *buf)
{
while (*buf) {
char *eol = buf;
char eol_char = 0;
while (*eol) {
if (*eol == '\r' || *eol == '\n') {
eol_char = *eol;
*eol = 0;
break;
}
eol++;
}
vpn_progress(vpninfo, PRG_DEBUG, "%c %s\n", prefix, buf);
if (!eol_char)
break;
*eol = eol_char;
buf = eol + 1;
if (eol_char == '\r' && *buf == '\n')
buf++;
}
}
void dump_buf_hex(struct openconnect_info *vpninfo, int loglevel, char prefix, unsigned char *buf, int len)
{
struct oc_text_buf *line = buf_alloc();
int i, j;
for (i = 0; i < len; i+=16) {
buf_truncate(line);
buf_append(line, "%04x:", i);
for (j = i; j < i+16; j++) {
if (!(j & 7))
buf_append(line, " ");
if (j < len)
buf_append(line, " %02x", buf[j]);
else
buf_append(line, " ");
}
buf_append(line, " |");
for (j = i; j < i+16 && j < len; j++)
buf_append(line, "%c", isprint(buf[j])? buf[j] : '.');
buf_append(line, "|");
if (buf_error(line))
break;
vpn_progress(vpninfo, loglevel, "%c %s\n", prefix, line->data);
}
buf_free(line);
}
/* Inputs:
* method: GET or POST
* vpninfo->hostname: Host DNS name
* vpninfo->port: TCP port, typically 443
* vpninfo->urlpath: Relative path, e.g. /+webvpn+/foo.html
* request_body_type: Content type for a POST (e.g. text/html). Can be NULL.
* request_body: POST content
* form_buf: Callee-allocated buffer for server content
*
* Return value:
* < 0, on error
* >=0, on success, indicating the length of the data in *form_buf
*/
int do_https_request(struct openconnect_info *vpninfo, const char *method,
const char *request_body_type, struct oc_text_buf *request_body,
char **form_buf, int fetch_redirect)
{
struct oc_text_buf *buf = buf_alloc();
int result;
int rq_retry;
int rlen, pad;
int i, auth = 0;
int max_redirects = 10;
if (request_body_type && buf_error(request_body))
return buf_error(request_body);
redirected:
if (max_redirects-- <= 0) {
result = -EIO;
goto out;
}
vpninfo->redirect_type = REDIR_TYPE_NONE;
if (*form_buf) {
free(*form_buf);
*form_buf = NULL;
}
/*
* A long time ago, I *wanted* to use an HTTP client library like cURL
* for this. But we need a *lot* of control over the underlying SSL
* transport, and we also have to do horrid tricks like the Juniper NC
* 'GET' request that actaully behaves like a 'CONNECT'.
*
* So the world gained Yet Another HTTP Implementation. Sorry.
*
*/
buf_truncate(buf);
buf_append(buf, "%s /%s HTTP/1.1\r\n", method, vpninfo->urlpath ?: "");
if (auth) {
result = gen_authorization_hdr(vpninfo, 0, buf);
if (result)
goto out;
/* Forget existing challenges */
clear_auth_states(vpninfo, vpninfo->http_auth, 0);
}
if (vpninfo->proto->add_http_headers)
vpninfo->proto->add_http_headers(vpninfo, buf);
if (request_body_type) {
rlen = request_body->pos;
/* force body length to be a multiple of 64, to avoid leaking
* password length. */
pad = 64*(1+rlen/64) - rlen;
buf_append(buf, "X-Pad: %0*d\r\n", pad, 0);
buf_append(buf, "Content-Type: %s\r\n", request_body_type);
buf_append(buf, "Content-Length: %d\r\n", (int)rlen);