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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* FTP routines for Apache proxy */
#define APR_WANT_BYTEFUNC
#include "mod_proxy.h"
#if APR_HAVE_TIME_H
#include <time.h>
#endif
#include "apr_version.h"
#if (APR_MAJOR_VERSION < 1)
#undef apr_socket_create
#define apr_socket_create apr_socket_create_ex
#endif
#define AUTODETECT_PWD
/* Automatic timestamping (Last-Modified header) based on MDTM is used if:
* 1) the FTP server supports the MDTM command and
* 2) HAVE_TIMEGM (preferred) or HAVE_GMTOFF is available at compile time
*/
#define USE_MDTM
module AP_MODULE_DECLARE_DATA proxy_ftp_module;
typedef struct {
int ftp_list_on_wildcard;
int ftp_list_on_wildcard_set;
int ftp_escape_wildcards;
int ftp_escape_wildcards_set;
const char *ftp_directory_charset;
} proxy_ftp_dir_conf;
static void *create_proxy_ftp_dir_config(apr_pool_t *p, char *dummy)
{
proxy_ftp_dir_conf *new =
(proxy_ftp_dir_conf *) apr_pcalloc(p, sizeof(proxy_ftp_dir_conf));
/* Put these in the dir config so they work inside <Location> */
new->ftp_list_on_wildcard = 1;
new->ftp_escape_wildcards = 1;
return (void *) new;
}
static void *merge_proxy_ftp_dir_config(apr_pool_t *p, void *basev, void *addv)
{
proxy_ftp_dir_conf *new = (proxy_ftp_dir_conf *) apr_pcalloc(p, sizeof(proxy_ftp_dir_conf));
proxy_ftp_dir_conf *add = (proxy_ftp_dir_conf *) addv;
proxy_ftp_dir_conf *base = (proxy_ftp_dir_conf *) basev;
/* Put these in the dir config so they work inside <Location> */
new->ftp_list_on_wildcard = add->ftp_list_on_wildcard_set ?
add->ftp_list_on_wildcard :
base->ftp_list_on_wildcard;
new->ftp_list_on_wildcard_set = add->ftp_list_on_wildcard_set ?
1 :
base->ftp_list_on_wildcard_set;
new->ftp_escape_wildcards = add->ftp_escape_wildcards_set ?
add->ftp_escape_wildcards :
base->ftp_escape_wildcards;
new->ftp_escape_wildcards_set = add->ftp_escape_wildcards_set ?
1 :
base->ftp_escape_wildcards_set;
new->ftp_directory_charset = add->ftp_directory_charset ?
add->ftp_directory_charset :
base->ftp_directory_charset;
return new;
}
static const char *set_ftp_list_on_wildcard(cmd_parms *cmd, void *dconf,
int flag)
{
proxy_ftp_dir_conf *conf = dconf;
conf->ftp_list_on_wildcard = flag;
conf->ftp_list_on_wildcard_set = 1;
return NULL;
}
static const char *set_ftp_escape_wildcards(cmd_parms *cmd, void *dconf,
int flag)
{
proxy_ftp_dir_conf *conf = dconf;
conf->ftp_escape_wildcards = flag;
conf->ftp_escape_wildcards_set = 1;
return NULL;
}
static const char *set_ftp_directory_charset(cmd_parms *cmd, void *dconf,
const char *arg)
{
proxy_ftp_dir_conf *conf = dconf;
conf->ftp_directory_charset = arg;
return NULL;
}
/*
* Decodes a '%' escaped string, and returns the number of characters
*/
static int decodeenc(char *x)
{
int i, j, ch;
if (x[0] == '\0')
return 0; /* special case for no characters */
for (i = 0, j = 0; x[i] != '\0'; i++, j++) {
/* decode it if not already done */
ch = x[i];
if (ch == '%' && apr_isxdigit(x[i + 1]) && apr_isxdigit(x[i + 2])) {
ch = ap_proxy_hex2c(&x[i + 1]);
i += 2;
}
x[j] = ch;
}
x[j] = '\0';
return j;
}
/*
* Escape the globbing characters in a path used as argument to
* the FTP commands (SIZE, CWD, RETR, MDTM, ...).
* ftpd assumes '\\' as a quoting character to escape special characters.
* Just returns the original string if ProxyFtpEscapeWildcards has been
* configured "off".
* Returns: escaped string
*/
#define FTP_GLOBBING_CHARS "*?[{~"
static const char *ftp_escape_globbingchars(apr_pool_t *p, const char *path, proxy_ftp_dir_conf *dconf)
{
char *ret;
char *d;
if (!dconf->ftp_escape_wildcards) {
return path;
}
ret = apr_palloc(p, 2*strlen(path)+sizeof(""));
for (d = ret; *path; ++path) {
if (strchr(FTP_GLOBBING_CHARS, *path) != NULL)
*d++ = '\\';
*d++ = *path;
}
*d = '\0';
return ret;
}
/*
* Check for globbing characters in a path used as argument to
* the FTP commands (SIZE, CWD, RETR, MDTM, ...).
* ftpd assumes '\\' as a quoting character to escape special characters.
* Returns: 0 (no globbing chars, or all globbing chars escaped), 1 (globbing chars)
*/
static int ftp_check_globbingchars(const char *path)
{
for ( ; *path; ++path) {
if (*path == '\\')
++path;
if (*path != '\0' && strchr(FTP_GLOBBING_CHARS, *path) != NULL)
return TRUE;
}
return FALSE;
}
/*
* checks an encoded ftp string for bad characters, namely, CR, LF or
* non-ascii character
*/
static int ftp_check_string(const char *x)
{
int i, ch = 0;
#if APR_CHARSET_EBCDIC
char buf[1];
#endif
for (i = 0; x[i] != '\0'; i++) {
ch = x[i];
if (ch == '%' && apr_isxdigit(x[i + 1]) && apr_isxdigit(x[i + 2])) {
ch = ap_proxy_hex2c(&x[i + 1]);
i += 2;
}
#if !APR_CHARSET_EBCDIC
if (ch == '\015' || ch == '\012' || (ch & 0x80))
#else /* APR_CHARSET_EBCDIC */
if (ch == '\r' || ch == '\n')
return 0;
buf[0] = ch;
ap_xlate_proto_to_ascii(buf, 1);
if (buf[0] & 0x80)
#endif /* APR_CHARSET_EBCDIC */
return 0;
}
return 1;
}
/*
* converts a series of buckets into a string
* XXX: BillS says this function performs essentially the same function as
* ap_rgetline() in protocol.c. Deprecate this function and use ap_rgetline()
* instead? I think ftp_string_read() will not work properly on non ASCII
* (EBCDIC) machines either.
*/
static apr_status_t ftp_string_read(conn_rec *c, apr_bucket_brigade *bb,
char *buff, apr_size_t bufflen, int *eos)
{
apr_bucket *e;
apr_status_t rv;
char *pos = buff;
char *response;
int found = 0;
apr_size_t len;
/* start with an empty string */
buff[0] = 0;
*eos = 0;
/* loop through each brigade */
while (!found) {
/* get brigade from network one line at a time */
if (APR_SUCCESS != (rv = ap_get_brigade(c->input_filters, bb,
AP_MODE_GETLINE,
APR_BLOCK_READ,
0))) {
return rv;
}
/* loop through each bucket */
while (!found) {
if (*eos || APR_BRIGADE_EMPTY(bb)) {
/* The connection aborted or timed out */
return APR_ECONNABORTED;
}
e = APR_BRIGADE_FIRST(bb);
if (APR_BUCKET_IS_EOS(e)) {
*eos = 1;
}
else {
if (APR_SUCCESS != (rv = apr_bucket_read(e,
(const char **)&response,
&len,
APR_BLOCK_READ))) {
return rv;
}
/*
* is string LF terminated?
* XXX: This check can be made more efficient by simply checking
* if the last character in the 'response' buffer is an ASCII_LF.
* See ap_rgetline() for an example.
*/
if (memchr(response, APR_ASCII_LF, len)) {
found = 1;
}
/* concat strings until buff is full - then throw the data away */
if (len > ((bufflen-1)-(pos-buff))) {
len = (bufflen-1)-(pos-buff);
}
if (len > 0) {
memcpy(pos, response, len);
pos += len;
}
}
apr_bucket_delete(e);
}
*pos = '\0';
}
return APR_SUCCESS;
}
/*
* Canonicalise ftp URLs.
*/
static int proxy_ftp_canon(request_rec *r, char *url)
{
char *user, *password, *host, *path, *parms, *strp, sport[7];
apr_pool_t *p = r->pool;
const char *err;
apr_port_t port, def_port;
/* */
if (strncasecmp(url, "ftp:", 4) == 0) {
url += 4;
}
else {
return DECLINED;
}
def_port = apr_uri_port_of_scheme("ftp");
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, "canonicalising URL %s", url);
port = def_port;
err = ap_proxy_canon_netloc(p, &url, &user, &password, &host, &port);
if (err)
return HTTP_BAD_REQUEST;
if (user != NULL && !ftp_check_string(user))
return HTTP_BAD_REQUEST;
if (password != NULL && !ftp_check_string(password))
return HTTP_BAD_REQUEST;
/* now parse path/parameters args, according to rfc1738 */
/*
* N.B. if this isn't a true proxy request, then the URL path (but not
* query args) has already been decoded. This gives rise to the problem
* of a ; being decoded into the path.
*/
strp = strchr(url, ';');
if (strp != NULL) {
*(strp++) = '\0';
parms = ap_proxy_canonenc(p, strp, strlen(strp), enc_parm, 0,
r->proxyreq);
if (parms == NULL)
return HTTP_BAD_REQUEST;
}
else
parms = "";
path = ap_proxy_canonenc(p, url, strlen(url), enc_path, 0, r->proxyreq);
if (path == NULL)
return HTTP_BAD_REQUEST;
if (!ftp_check_string(path))
return HTTP_BAD_REQUEST;
if (r->proxyreq && r->args != NULL) {
if (strp != NULL) {
strp = ap_proxy_canonenc(p, r->args, strlen(r->args), enc_parm, 1, r->proxyreq);
if (strp == NULL)
return HTTP_BAD_REQUEST;
parms = apr_pstrcat(p, parms, "?", strp, NULL);
}
else {
strp = ap_proxy_canonenc(p, r->args, strlen(r->args), enc_fpath, 1, r->proxyreq);
if (strp == NULL)
return HTTP_BAD_REQUEST;
path = apr_pstrcat(p, path, "?", strp, NULL);
}
r->args = NULL;
}
/* now, rebuild URL */
if (port != def_port)
apr_snprintf(sport, sizeof(sport), ":%d", port);
else
sport[0] = '\0';
if (ap_strchr_c(host, ':')) { /* if literal IPv6 address */
host = apr_pstrcat(p, "[", host, "]", NULL);
}
r->filename = apr_pstrcat(p, "proxy:ftp://", (user != NULL) ? user : "",
(password != NULL) ? ":" : "",
(password != NULL) ? password : "",
(user != NULL) ? "@" : "", host, sport, "/", path,
(parms[0] != '\0') ? ";" : "", parms, NULL);
return OK;
}
/* we chop lines longer than 80 characters */
#define MAX_LINE_LEN 80
/*
* Reads response lines, returns both the ftp status code and
* remembers the response message in the supplied buffer
*/
static int ftp_getrc_msg(conn_rec *ftp_ctrl, apr_bucket_brigade *bb, char *msgbuf, int msglen)
{
int status;
char response[MAX_LINE_LEN];
char buff[5];
char *mb = msgbuf, *me = &msgbuf[msglen];
apr_status_t rv;
int eos;
if (APR_SUCCESS != (rv = ftp_string_read(ftp_ctrl, bb, response, sizeof(response), &eos))) {
return -1;
}
/*
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL, APLOGNO(03233)
"<%s", response);
*/
if (!apr_isdigit(response[0]) || !apr_isdigit(response[1]) ||
!apr_isdigit(response[2]) || (response[3] != ' ' && response[3] != '-'))
status = 0;
else
status = 100 * response[0] + 10 * response[1] + response[2] - 111 * '0';
mb = apr_cpystrn(mb, response + 4, me - mb);
if (response[3] == '-') {
memcpy(buff, response, 3);
buff[3] = ' ';
do {
if (APR_SUCCESS != (rv = ftp_string_read(ftp_ctrl, bb, response, sizeof(response), &eos))) {
return -1;
}
mb = apr_cpystrn(mb, response + (' ' == response[0] ? 1 : 4), me - mb);
} while (memcmp(response, buff, 4) != 0);
}
return status;
}
/* this is a filter that turns a raw ASCII directory listing into pretty HTML */
/* ideally, mod_proxy should simply send the raw directory list up the filter
* stack to mod_autoindex, which in theory should turn the raw ascii into
* pretty html along with all the bells and whistles it provides...
*
* all in good time...! :)
*/
typedef struct {
apr_bucket_brigade *in;
char buffer[MAX_STRING_LEN];
enum {
HEADER, BODY, FOOTER
} state;
} proxy_dir_ctx_t;
/* fallback regex for ls -s1; ($0..$2) == 3 */
#define LS_REG_PATTERN "^ *([0-9]+) +([^ ]+)$"
#define LS_REG_MATCH 3
static ap_regex_t *ls_regex;
static apr_status_t proxy_send_dir_filter(ap_filter_t *f,
apr_bucket_brigade *in)
{
request_rec *r = f->r;
conn_rec *c = r->connection;
apr_pool_t *p = r->pool;
apr_bucket_brigade *out = apr_brigade_create(p, c->bucket_alloc);
apr_status_t rv;
int n;
char *dir, *path, *reldir, *site, *str, *type;
const char *pwd = apr_table_get(r->notes, "Directory-PWD");
const char *readme = apr_table_get(r->notes, "Directory-README");
proxy_dir_ctx_t *ctx = f->ctx;
if (!ctx) {
f->ctx = ctx = apr_pcalloc(p, sizeof(*ctx));
ctx->in = apr_brigade_create(p, c->bucket_alloc);
ctx->buffer[0] = 0;
ctx->state = HEADER;
}
/* combine the stored and the new */
APR_BRIGADE_CONCAT(ctx->in, in);
if (HEADER == ctx->state) {
/* basedir is either "", or "/%2f" for the "squid %2f hack" */
const char *basedir = ""; /* By default, path is relative to the $HOME dir */
char *wildcard = NULL;
const char *escpath;
/*
* In the reverse proxy case we need to construct our site string
* via ap_construct_url. For non anonymous sites apr_uri_unparse would
* only supply us with 'username@' which leads to the construction of
* an invalid base href later on. Losing the username part of the URL
* is no problem in the reverse proxy case as the browser sents the
* credentials anyway once entered.
*/
if (r->proxyreq == PROXYREQ_REVERSE) {
site = ap_construct_url(p, "", r);
}
else {
/* Save "scheme://site" prefix without password */
site = apr_uri_unparse(p, &f->r->parsed_uri,
APR_URI_UNP_OMITPASSWORD |
APR_URI_UNP_OMITPATHINFO);
}
/* ... and path without query args */
path = apr_uri_unparse(p, &f->r->parsed_uri, APR_URI_UNP_OMITSITEPART | APR_URI_UNP_OMITQUERY);
/* If path began with /%2f, change the basedir */
if (strncasecmp(path, "/%2f", 4) == 0) {
basedir = "/%2f";
}
/* Strip off a type qualifier. It is ignored for dir listings */
if ((type = strstr(path, ";type=")) != NULL)
*type++ = '\0';
(void)decodeenc(path);
while (path[1] == '/') /* collapse multiple leading slashes to one */
++path;
reldir = strrchr(path, '/');
if (reldir != NULL && ftp_check_globbingchars(reldir)) {
wildcard = &reldir[1];
reldir[0] = '\0'; /* strip off the wildcard suffix */
}
/* Copy path, strip (all except the last) trailing slashes */
/* (the trailing slash is needed for the dir component loop below) */
path = dir = apr_pstrcat(p, path, "/", NULL);
for (n = strlen(path); n > 1 && path[n - 1] == '/' && path[n - 2] == '/'; --n)
path[n - 1] = '\0';
/* Add a link to the root directory (if %2f hack was used) */
str = (basedir[0] != '\0') ? "<a href=\"/%2f/\">%2f</a>/" : "";
/* print "ftp://host/" */
escpath = ap_escape_html(p, path);
str = apr_psprintf(p, DOCTYPE_HTML_3_2
"<html>\n <head>\n <title>%s%s%s</title>\n"
"<base href=\"%s%s%s\">\n"
" </head>\n"
" <body>\n <h2>Directory of "
"<a href=\"/\">%s</a>/%s",
ap_escape_html(p, site), basedir, escpath,
ap_escape_uri(p, site), basedir, escpath,
ap_escape_uri(p, site), str);
APR_BRIGADE_INSERT_TAIL(out, apr_bucket_pool_create(str, strlen(str),
p, c->bucket_alloc));
for (dir = path+1; (dir = strchr(dir, '/')) != NULL; )
{
*dir = '\0';
if ((reldir = strrchr(path+1, '/'))==NULL) {
reldir = path+1;
}
else
++reldir;
/* print "path/" component */
str = apr_psprintf(p, "<a href=\"%s%s/\">%s</a>/", basedir,
ap_escape_uri(p, path),
ap_escape_html(p, reldir));
*dir = '/';
while (*dir == '/')
++dir;
APR_BRIGADE_INSERT_TAIL(out, apr_bucket_pool_create(str,
strlen(str), p,
c->bucket_alloc));
}
if (wildcard != NULL) {
wildcard = ap_escape_html(p, wildcard);
APR_BRIGADE_INSERT_TAIL(out, apr_bucket_pool_create(wildcard,
strlen(wildcard), p,
c->bucket_alloc));
}
/* If the caller has determined the current directory, and it differs */
/* from what the client requested, then show the real name */
if (pwd == NULL || strncmp(pwd, path, strlen(pwd)) == 0) {
str = apr_psprintf(p, "</h2>\n\n <hr />\n\n<pre>");
}
else {
str = apr_psprintf(p, "</h2>\n\n(%s)\n\n <hr />\n\n<pre>",
ap_escape_html(p, pwd));
}
APR_BRIGADE_INSERT_TAIL(out, apr_bucket_pool_create(str, strlen(str),
p, c->bucket_alloc));
/* print README */
if (readme) {
str = apr_psprintf(p, "%s\n</pre>\n\n<hr />\n\n<pre>\n",
ap_escape_html(p, readme));
APR_BRIGADE_INSERT_TAIL(out, apr_bucket_pool_create(str,
strlen(str), p,
c->bucket_alloc));
}
/* make sure page intro gets sent out */
APR_BRIGADE_INSERT_TAIL(out, apr_bucket_flush_create(c->bucket_alloc));
if (APR_SUCCESS != (rv = ap_pass_brigade(f->next, out))) {
return rv;
}
apr_brigade_cleanup(out);
ctx->state = BODY;
}
/* loop through each line of directory */
while (BODY == ctx->state) {
char *filename;
int found = 0;
int eos = 0;
ap_regmatch_t re_result[LS_REG_MATCH];
/* get a complete line */
/* if the buffer overruns - throw data away */
while (!found && !APR_BRIGADE_EMPTY(ctx->in)) {
char *pos, *response;
apr_size_t len, max;
apr_bucket *e;
e = APR_BRIGADE_FIRST(ctx->in);
if (APR_BUCKET_IS_EOS(e)) {
eos = 1;
break;
}
if (APR_SUCCESS != (rv = apr_bucket_read(e, (const char **)&response, &len, APR_BLOCK_READ))) {
return rv;
}
pos = memchr(response, APR_ASCII_LF, len);
if (pos != NULL) {
if ((response + len) != (pos + 1)) {
len = pos - response + 1;
apr_bucket_split(e, pos - response + 1);
}
found = 1;
}
max = sizeof(ctx->buffer) - strlen(ctx->buffer) - 1;
if (len > max) {
len = max;
}
/* len+1 to leave space for the trailing nil char */
apr_cpystrn(ctx->buffer+strlen(ctx->buffer), response, len+1);
apr_bucket_delete(e);
}
/* EOS? jump to footer */
if (eos) {
ctx->state = FOOTER;
break;
}
/* not complete? leave and try get some more */
if (!found) {
return APR_SUCCESS;
}
{
apr_size_t n = strlen(ctx->buffer);
if (ctx->buffer[n-1] == CRLF[1]) /* strip trailing '\n' */
ctx->buffer[--n] = '\0';
if (ctx->buffer[n-1] == CRLF[0]) /* strip trailing '\r' if present */
ctx->buffer[--n] = '\0';
}
/* a symlink? */
if (ctx->buffer[0] == 'l' && (filename = strstr(ctx->buffer, " -> ")) != NULL) {
char *link_ptr = filename;
do {
filename--;
} while (filename[0] != ' ' && filename > ctx->buffer);
if (filename > ctx->buffer)
*(filename++) = '\0';
*(link_ptr++) = '\0';
str = apr_psprintf(p, "%s <a href=\"%s\">%s %s</a>\n",
ap_escape_html(p, ctx->buffer),
ap_escape_uri(p, filename),
ap_escape_html(p, filename),
ap_escape_html(p, link_ptr));
}
/* a directory/file? */
else if (ctx->buffer[0] == 'd' || ctx->buffer[0] == '-' || ctx->buffer[0] == 'l' || apr_isdigit(ctx->buffer[0])) {
int searchidx = 0;
char *searchptr = NULL;
int firstfile = 1;
if (apr_isdigit(ctx->buffer[0])) { /* handle DOS dir */
searchptr = strchr(ctx->buffer, '<');
if (searchptr != NULL)
*searchptr = '[';
searchptr = strchr(ctx->buffer, '>');
if (searchptr != NULL)
*searchptr = ']';
}
filename = strrchr(ctx->buffer, ' ');
if (filename == NULL) {
/* Line is broken. Ignore it. */
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(01034)
"proxy_ftp: could not parse line %s",
ctx->buffer);
/* erase buffer for next time around */
ctx->buffer[0] = 0;
continue; /* while state is BODY */
}
*(filename++) = '\0';
/* handle filenames with spaces in 'em */
if (!strcmp(filename, ".") || !strcmp(filename, "..") || firstfile) {
firstfile = 0;
searchidx = filename - ctx->buffer;
}
else if (searchidx != 0 && ctx->buffer[searchidx] != 0) {
*(--filename) = ' ';
ctx->buffer[searchidx - 1] = '\0';
filename = &ctx->buffer[searchidx];
}
/* Append a slash to the HREF link for directories */
if (!strcmp(filename, ".") || !strcmp(filename, "..") || ctx->buffer[0] == 'd') {
str = apr_psprintf(p, "%s <a href=\"%s/\">%s</a>\n",
ap_escape_html(p, ctx->buffer),
ap_escape_uri(p, filename),
ap_escape_html(p, filename));
}
else {
str = apr_psprintf(p, "%s <a href=\"%s\">%s</a>\n",
ap_escape_html(p, ctx->buffer),
ap_escape_uri(p, filename),
ap_escape_html(p, filename));
}
}
/* Try a fallback for listings in the format of "ls -s1" */
else if (0 == ap_regexec(ls_regex, ctx->buffer, LS_REG_MATCH, re_result, 0)) {
/*
* We don't need to check for rm_eo == rm_so == -1 here since ls_regex
* is such that $2 cannot be unset if we have a match.
*/
filename = apr_pstrndup(p, &ctx->buffer[re_result[2].rm_so], re_result[2].rm_eo - re_result[2].rm_so);
str = apr_pstrcat(p, ap_escape_html(p, apr_pstrndup(p, ctx->buffer, re_result[2].rm_so)),
"<a href=\"", ap_escape_uri(p, filename), "\">",
ap_escape_html(p, filename), "</a>\n", NULL);
}
else {
strcat(ctx->buffer, "\n"); /* re-append the newline */
str = ap_escape_html(p, ctx->buffer);
}
/* erase buffer for next time around */
ctx->buffer[0] = 0;
APR_BRIGADE_INSERT_TAIL(out, apr_bucket_pool_create(str, strlen(str), p,
c->bucket_alloc));
APR_BRIGADE_INSERT_TAIL(out, apr_bucket_flush_create(c->bucket_alloc));
if (APR_SUCCESS != (rv = ap_pass_brigade(f->next, out))) {
return rv;
}
apr_brigade_cleanup(out);
}
if (FOOTER == ctx->state) {
str = apr_psprintf(p, "</pre>\n\n <hr />\n\n %s\n\n </body>\n</html>\n", ap_psignature("", r));
APR_BRIGADE_INSERT_TAIL(out, apr_bucket_pool_create(str, strlen(str), p,
c->bucket_alloc));
APR_BRIGADE_INSERT_TAIL(out, apr_bucket_flush_create(c->bucket_alloc));
APR_BRIGADE_INSERT_TAIL(out, apr_bucket_eos_create(c->bucket_alloc));
if (APR_SUCCESS != (rv = ap_pass_brigade(f->next, out))) {
return rv;
}
apr_brigade_destroy(out);
}
return APR_SUCCESS;
}
/* Parse EPSV reply and return port, or zero on error. */
static apr_port_t parse_epsv_reply(const char *reply)
{
const char *p;
char *ep;
long port;
/* Reply syntax per RFC 2428: "229 blah blah (|||port|)" where '|'
* can be any character in ASCII from 33-126, obscurely. Verify
* the syntax. */
p = ap_strchr_c(reply, '(');
if (p == NULL || !p[1] || p[1] != p[2] || p[1] != p[3]
|| p[4] == p[1]) {
return 0;
}
errno = 0;
port = strtol(p + 4, &ep, 10);
if (errno || port < 1 || port > 65535 || ep[0] != p[1] || ep[1] != ')') {
return 0;
}
return (apr_port_t)port;
}
/*
* Generic "send FTP command to server" routine, using the control socket.
* Returns the FTP returncode (3 digit code)
* Allows for tracing the FTP protocol (in LogLevel debug)
*/
static int
proxy_ftp_command(const char *cmd, request_rec *r, conn_rec *ftp_ctrl,
apr_bucket_brigade *bb, char **pmessage)
{
char *crlf;
int rc;
char message[HUGE_STRING_LEN];
/* If cmd == NULL, we retrieve the next ftp response line */
if (cmd != NULL) {
conn_rec *c = r->connection;
APR_BRIGADE_INSERT_TAIL(bb, apr_bucket_pool_create(cmd, strlen(cmd), r->pool, c->bucket_alloc));
APR_BRIGADE_INSERT_TAIL(bb, apr_bucket_flush_create(c->bucket_alloc));
ap_pass_brigade(ftp_ctrl->output_filters, bb);
/* strip off the CRLF for logging */
apr_cpystrn(message, cmd, sizeof(message));
if ((crlf = strchr(message, '\r')) != NULL ||
(crlf = strchr(message, '\n')) != NULL)
*crlf = '\0';
if (strncmp(message,"PASS ", 5) == 0)
strcpy(&message[5], "****");
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, ">%s", message);
}
rc = ftp_getrc_msg(ftp_ctrl, bb, message, sizeof message);
if (rc == -1 || rc == 421)
strcpy(message,"<unable to read result>");
if ((crlf = strchr(message, '\r')) != NULL ||
(crlf = strchr(message, '\n')) != NULL)
*crlf = '\0';
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, "<%3.3u %s", rc, message);
if (pmessage != NULL)
*pmessage = apr_pstrdup(r->pool, message);
return rc;
}
/* Set ftp server to TYPE {A,I,E} before transfer of a directory or file */
static int ftp_set_TYPE(char xfer_type, request_rec *r, conn_rec *ftp_ctrl,
apr_bucket_brigade *bb, char **pmessage)
{
char old_type[2] = { 'A', '\0' }; /* After logon, mode is ASCII */
int ret = HTTP_OK;
int rc;
/* set desired type */
old_type[0] = xfer_type;
rc = proxy_ftp_command(apr_pstrcat(r->pool, "TYPE ", old_type, CRLF, NULL),
r, ftp_ctrl, bb, pmessage);
/* responses: 200, 421, 500, 501, 504, 530 */
/* 200 Command okay. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 504 Command not implemented for that parameter. */
/* 530 Not logged in. */
if (rc == -1 || rc == 421) {
ret = ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
else if (rc != 200 && rc != 504) {
ret = ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Unable to set transfer type");
}
/* Allow not implemented */
else if (rc == 504) {
/* ignore it silently */
}
return ret;
}
/* Return the current directory which we have selected on the FTP server, or NULL */
static char *ftp_get_PWD(request_rec *r, conn_rec *ftp_ctrl, apr_bucket_brigade *bb)
{
char *cwd = NULL;
char *ftpmessage = NULL;
/* responses: 257, 500, 501, 502, 421, 550 */
/* 257 "<directory-name>" <commentary> */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
/* 550 Requested action not taken. */
switch (proxy_ftp_command("PWD" CRLF, r, ftp_ctrl, bb, &ftpmessage)) {
case -1:
case 421:
case 550:
ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Failed to read PWD on ftp server");
break;
case 257: {
const char *dirp = ftpmessage;
cwd = ap_getword_conf(r->pool, &dirp);
}
}
return cwd;
}
/* Common routine for failed authorization (i.e., missing or wrong password)
* to an ftp service. This causes most browsers to retry the request
* with username and password (which was presumably queried from the user)
* supplied in the Authorization: header.
* Note that we "invent" a realm name which consists of the
* ftp://user@host part of the reqest (sans password -if supplied but invalid-)
*/
static int ftp_unauthorized(request_rec *r, int log_it)
{
r->proxyreq = PROXYREQ_NONE;
/*
* Log failed requests if they supplied a password (log username/password
* guessing attempts)
*/
if (log_it)
ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(01035)
"missing or failed auth to %s",
apr_uri_unparse(r->pool,
&r->parsed_uri, APR_URI_UNP_OMITPATHINFO));
apr_table_setn(r->err_headers_out, "WWW-Authenticate",
apr_pstrcat(r->pool, "Basic realm=\"",
apr_uri_unparse(r->pool, &r->parsed_uri,
APR_URI_UNP_OMITPASSWORD | APR_URI_UNP_OMITPATHINFO),
"\"", NULL));
return HTTP_UNAUTHORIZED;
}
static
apr_status_t proxy_ftp_cleanup(request_rec *r, proxy_conn_rec *backend)
{
backend->close = 1;
ap_set_module_config(r->connection->conn_config, &proxy_ftp_module, NULL);
ap_proxy_release_connection("FTP", backend, r->server);
return OK;
}
static
int ftp_proxyerror(request_rec *r, proxy_conn_rec *conn, int statuscode, const char *message)
{
proxy_ftp_cleanup(r, conn);
return ap_proxyerror(r, statuscode, message);
}
/*
* Handles direct access of ftp:// URLs
* Original (Non-PASV) version from
* Troy Morrison <spiffnet@zoom.com>
* PASV added by Chuck
* Filters by [Graham Leggett <minfrin@sharp.fm>]
*/
static int proxy_ftp_handler(request_rec *r, proxy_worker *worker,
proxy_server_conf *conf, char *url,
const char *proxyhost, apr_port_t proxyport)
{
apr_pool_t *p = r->pool;
conn_rec *c = r->connection;
proxy_conn_rec *backend;
apr_socket_t *sock, *local_sock, *data_sock = NULL;
apr_sockaddr_t *connect_addr = NULL;
apr_status_t rv;
conn_rec *origin, *data = NULL;
apr_status_t err = APR_SUCCESS;
apr_status_t uerr = APR_SUCCESS;
apr_bucket_brigade *bb = apr_brigade_create(p, c->bucket_alloc);
char *buf, *connectname;
apr_port_t connectport;
char *ftpmessage = NULL;
char *path, *strp, *type_suffix, *cwd = NULL;
apr_uri_t uri;
char *user = NULL;
/* char *account = NULL; how to supply an account in a URL? */
const char *password = NULL;
int len, rc;
int one = 1;
char *size = NULL;
char xfer_type = 'A'; /* after ftp login, the default is ASCII */
int dirlisting = 0;
#if defined(USE_MDTM) && (defined(HAVE_TIMEGM) || defined(HAVE_GMTOFF))
apr_time_t mtime = 0L;
#endif
proxy_ftp_dir_conf *fdconf = ap_get_module_config(r->per_dir_config,
&proxy_ftp_module);
/* stuff for PASV mode */
int connect = 0, use_port = 0;
char dates[APR_RFC822_DATE_LEN];
int status;
apr_pool_t *address_pool;
/* is this for us? */
if (proxyhost) {