From 2629f42d4cfdd04df0544007b03161e3d5d52d54 Mon Sep 17 00:00:00 2001 From: Daniel Stenberg Date: Tue, 24 Nov 2020 14:56:57 +0100 Subject: [PATCH] ftp: CURLOPT_FTP_SKIP_PASV_IP by default The command line tool also independently sets --ftp-skip-pasv-ip by default. Ten test cases updated to adapt the modified --libcurl output. Bug: https://curl.se/docs/CVE-2020-8284.html CVE-2020-8284 Reported-by: Varnavas Papaioannou Upstream-commit: ec9cc725d598ac77de7b6df8afeec292b3c8ad46 Signed-off-by: Kamil Dudka --- docs/cmdline-opts/ftp-skip-pasv-ip.d | 2 ++ docs/libcurl/opts/CURLOPT_FTP_SKIP_PASV_IP.3 | 8 +++++--- lib/url.c | 1 + src/tool_cfgable.c | 1 + tests/data/test1400 | 1 + tests/data/test1401 | 1 + tests/data/test1402 | 1 + tests/data/test1403 | 1 + tests/data/test1404 | 1 + tests/data/test1405 | 1 + tests/data/test1406 | 1 + tests/data/test1407 | 1 + tests/data/test1420 | 1 + 13 files changed, 18 insertions(+), 3 deletions(-) diff --git a/docs/cmdline-opts/ftp-skip-pasv-ip.d b/docs/cmdline-opts/ftp-skip-pasv-ip.d index da6ab11..4be8b43 100644 --- a/docs/cmdline-opts/ftp-skip-pasv-ip.d +++ b/docs/cmdline-opts/ftp-skip-pasv-ip.d @@ -9,4 +9,6 @@ to curl's PASV command when curl connects the data connection. Instead curl will re-use the same IP address it already uses for the control connection. +Since curl 7.74.0 this option is enabled by default. + This option has no effect if PORT, EPRT or EPSV is used instead of PASV. diff --git a/docs/libcurl/opts/CURLOPT_FTP_SKIP_PASV_IP.3 b/docs/libcurl/opts/CURLOPT_FTP_SKIP_PASV_IP.3 index 4d3026a..4227ed6 100644 --- a/docs/libcurl/opts/CURLOPT_FTP_SKIP_PASV_IP.3 +++ b/docs/libcurl/opts/CURLOPT_FTP_SKIP_PASV_IP.3 @@ -5,7 +5,7 @@ .\" * | (__| |_| | _ <| |___ .\" * \___|\___/|_| \_\_____| .\" * -.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, , et al. +.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, , et al. .\" * .\" * This software is licensed as described in the file COPYING, which .\" * you should have received as part of this distribution. The terms @@ -36,11 +36,13 @@ address it already uses for the control connection. But it will use the port number from the 227-response. This option thus allows libcurl to work around broken server installations -that due to NATs, firewalls or incompetence report the wrong IP address back. +that due to NATs, firewalls or incompetence report the wrong IP address +back. Setting the option also reduces the risk for various sorts of client +abuse by malicious servers. This option has no effect if PORT, EPRT or EPSV is used instead of PASV. .SH DEFAULT -0 +1 since 7.74.0, was 0 before then. .SH PROTOCOLS FTP .SH EXAMPLE diff --git a/lib/url.c b/lib/url.c index e77f391..b18db25 100644 --- a/lib/url.c +++ b/lib/url.c @@ -434,6 +434,7 @@ CURLcode Curl_init_userdefined(struct Curl_easy *data) set->ftp_use_eprt = TRUE; /* FTP defaults to EPRT operations */ set->ftp_use_pret = FALSE; /* mainly useful for drftpd servers */ set->ftp_filemethod = FTPFILE_MULTICWD; + set->ftp_skip_ip = TRUE; /* skip PASV IP by default */ set->dns_cache_timeout = 60; /* Timeout every 60 seconds by default */ diff --git a/src/tool_cfgable.c b/src/tool_cfgable.c index 81e16c1..110191e 100644 --- a/src/tool_cfgable.c +++ b/src/tool_cfgable.c @@ -43,6 +43,7 @@ void config_init(struct OperationConfig* config) config->proto_default = NULL; config->tcp_nodelay = TRUE; /* enabled by default */ config->happy_eyeballs_timeout_ms = CURL_HET_DEFAULT; + config->ftp_skip_ip = TRUE; } static void free_config_fields(struct OperationConfig *config) diff --git a/tests/data/test1400 b/tests/data/test1400 index 10faef3..9d18a30 100644 --- a/tests/data/test1400 +++ b/tests/data/test1400 @@ -73,6 +73,7 @@ int main(int argc, char *argv[]) curl_easy_setopt(hnd, CURLOPT_USERAGENT, "stripped"); curl_easy_setopt(hnd, CURLOPT_MAXREDIRS, 50L); curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L); + curl_easy_setopt(hnd, CURLOPT_FTP_SKIP_PASV_IP, 1L); curl_easy_setopt(hnd, CURLOPT_TCP_KEEPALIVE, 1L); /* Here is a list of options the curl code used that cannot get generated diff --git a/tests/data/test1401 b/tests/data/test1401 index f330931..99cb0cb 100644 --- a/tests/data/test1401 +++ b/tests/data/test1401 @@ -89,6 +89,7 @@ int main(int argc, char *argv[]) curl_easy_setopt(hnd, CURLOPT_MAXREDIRS, 50L); curl_easy_setopt(hnd, CURLOPT_COOKIE, "chocolate=chip"); curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L); + curl_easy_setopt(hnd, CURLOPT_FTP_SKIP_PASV_IP, 1L); curl_easy_setopt(hnd, CURLOPT_TCP_KEEPALIVE, 1L); curl_easy_setopt(hnd, CURLOPT_PROTOCOLS, (long)CURLPROTO_FILE | (long)CURLPROTO_FTP | diff --git a/tests/data/test1402 b/tests/data/test1402 index 9a94283..ef55bd6 100644 --- a/tests/data/test1402 +++ b/tests/data/test1402 @@ -80,6 +80,7 @@ int main(int argc, char *argv[]) curl_easy_setopt(hnd, CURLOPT_USERAGENT, "stripped"); curl_easy_setopt(hnd, CURLOPT_MAXREDIRS, 50L); curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L); + curl_easy_setopt(hnd, CURLOPT_FTP_SKIP_PASV_IP, 1L); curl_easy_setopt(hnd, CURLOPT_TCP_KEEPALIVE, 1L); /* Here is a list of options the curl code used that cannot get generated diff --git a/tests/data/test1403 b/tests/data/test1403 index 79cdf49..78932c2 100644 --- a/tests/data/test1403 +++ b/tests/data/test1403 @@ -75,6 +75,7 @@ int main(int argc, char *argv[]) curl_easy_setopt(hnd, CURLOPT_USERAGENT, "stripped"); curl_easy_setopt(hnd, CURLOPT_MAXREDIRS, 50L); curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L); + curl_easy_setopt(hnd, CURLOPT_FTP_SKIP_PASV_IP, 1L); curl_easy_setopt(hnd, CURLOPT_TCP_KEEPALIVE, 1L); /* Here is a list of options the curl code used that cannot get generated diff --git a/tests/data/test1404 b/tests/data/test1404 index 9c6f2e7..8ea5e04 100644 --- a/tests/data/test1404 +++ b/tests/data/test1404 @@ -144,6 +144,7 @@ int main(int argc, char *argv[]) curl_easy_setopt(hnd, CURLOPT_USERAGENT, "stripped"); curl_easy_setopt(hnd, CURLOPT_MAXREDIRS, 50L); curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L); + curl_easy_setopt(hnd, CURLOPT_FTP_SKIP_PASV_IP, 1L); curl_easy_setopt(hnd, CURLOPT_TCP_KEEPALIVE, 1L); /* Here is a list of options the curl code used that cannot get generated diff --git a/tests/data/test1405 b/tests/data/test1405 index 73769ee..5a83b6e 100644 --- a/tests/data/test1405 +++ b/tests/data/test1405 @@ -89,6 +89,7 @@ int main(int argc, char *argv[]) curl_easy_setopt(hnd, CURLOPT_POSTQUOTE, slist2); curl_easy_setopt(hnd, CURLOPT_PREQUOTE, slist3); curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L); + curl_easy_setopt(hnd, CURLOPT_FTP_SKIP_PASV_IP, 1L); curl_easy_setopt(hnd, CURLOPT_TCP_KEEPALIVE, 1L); /* Here is a list of options the curl code used that cannot get generated diff --git a/tests/data/test1406 b/tests/data/test1406 index 796dd22..c941e00 100644 --- a/tests/data/test1406 +++ b/tests/data/test1406 @@ -80,6 +80,7 @@ int main(int argc, char *argv[]) curl_easy_setopt(hnd, CURLOPT_URL, "smtp://%HOSTIP:%SMTPPORT/1406"); curl_easy_setopt(hnd, CURLOPT_UPLOAD, 1L); curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L); + curl_easy_setopt(hnd, CURLOPT_FTP_SKIP_PASV_IP, 1L); curl_easy_setopt(hnd, CURLOPT_TCP_KEEPALIVE, 1L); curl_easy_setopt(hnd, CURLOPT_MAIL_FROM, "sender@example.com"); curl_easy_setopt(hnd, CURLOPT_MAIL_RCPT, slist1); diff --git a/tests/data/test1407 b/tests/data/test1407 index 9800eee..ddba7b7 100644 --- a/tests/data/test1407 +++ b/tests/data/test1407 @@ -62,6 +62,7 @@ int main(int argc, char *argv[]) curl_easy_setopt(hnd, CURLOPT_DIRLISTONLY, 1L); curl_easy_setopt(hnd, CURLOPT_USERPWD, "user:secret"); curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L); + curl_easy_setopt(hnd, CURLOPT_FTP_SKIP_PASV_IP, 1L); curl_easy_setopt(hnd, CURLOPT_TCP_KEEPALIVE, 1L); /* Here is a list of options the curl code used that cannot get generated diff --git a/tests/data/test1420 b/tests/data/test1420 index a5e1c52..72fb353 100644 --- a/tests/data/test1420 +++ b/tests/data/test1420 @@ -67,6 +67,7 @@ int main(int argc, char *argv[]) curl_easy_setopt(hnd, CURLOPT_URL, "imap://%HOSTIP:%IMAPPORT/1420/;UID=1"); curl_easy_setopt(hnd, CURLOPT_USERPWD, "user:secret"); curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L); + curl_easy_setopt(hnd, CURLOPT_FTP_SKIP_PASV_IP, 1L); curl_easy_setopt(hnd, CURLOPT_TCP_KEEPALIVE, 1L); /* Here is a list of options the curl code used that cannot get generated -- 2.26.2