1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
|
From 8cebc092cd18f4cfb669f66018ea8ffc6f408584 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@ruby-lang.org>
Date: Wed, 7 Jul 2021 11:57:15 +0900
Subject: [PATCH] Ignore IP addresses in PASV responses by default, and add new
option use_pasv_ip
This fixes CVE-2021-31810.
Reported by Alexandr Savca.
Co-authored-by: Shugo Maeda <shugo@ruby-lang.org>
CVE: CVE-2021-31810
Upstream-Status: Backport
[https://github.com/ruby/ruby/commit/bf4d05173c7cf04d8892e4b64508ecf7902717cd]
Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
---
lib/net/ftp.rb | 15 +++-
test/net/ftp/test_ftp.rb | 159 ++++++++++++++++++++++++++++++++++++++-
2 files changed, 170 insertions(+), 4 deletions(-)
diff --git a/lib/net/ftp.rb b/lib/net/ftp.rb
index 88e8655..d6f5cc3 100644
--- a/lib/net/ftp.rb
+++ b/lib/net/ftp.rb
@@ -98,6 +98,10 @@ module Net
# When +true+, the connection is in passive mode. Default: +true+.
attr_accessor :passive
+ # When +true+, use the IP address in PASV responses. Otherwise, it uses
+ # the same IP address for the control connection. Default: +false+.
+ attr_accessor :use_pasv_ip
+
# When +true+, all traffic to and from the server is written
# to +$stdout+. Default: +false+.
attr_accessor :debug_mode
@@ -206,6 +210,9 @@ module Net
# handshake.
# See Net::FTP#ssl_handshake_timeout for
# details. Default: +nil+.
+ # use_pasv_ip:: When +true+, use the IP address in PASV responses.
+ # Otherwise, it uses the same IP address for the control
+ # connection. Default: +false+.
# debug_mode:: When +true+, all traffic to and from the server is
# written to +$stdout+. Default: +false+.
#
@@ -266,6 +273,7 @@ module Net
@open_timeout = options[:open_timeout]
@ssl_handshake_timeout = options[:ssl_handshake_timeout]
@read_timeout = options[:read_timeout] || 60
+ @use_pasv_ip = options[:use_pasv_ip] || false
if host
connect(host, options[:port] || FTP_PORT)
if options[:username]
@@ -1371,7 +1379,12 @@ module Net
raise FTPReplyError, resp
end
if m = /\((?<host>\d+(?:,\d+){3}),(?<port>\d+,\d+)\)/.match(resp)
- return parse_pasv_ipv4_host(m["host"]), parse_pasv_port(m["port"])
+ if @use_pasv_ip
+ host = parse_pasv_ipv4_host(m["host"])
+ else
+ host = @bare_sock.remote_address.ip_address
+ end
+ return host, parse_pasv_port(m["port"])
else
raise FTPProtoError, resp
end
diff --git a/test/net/ftp/test_ftp.rb b/test/net/ftp/test_ftp.rb
index 023e794..243d4ad 100644
--- a/test/net/ftp/test_ftp.rb
+++ b/test/net/ftp/test_ftp.rb
@@ -61,7 +61,7 @@ class FTPTest < Test::Unit::TestCase
end
def test_parse227
- ftp = Net::FTP.new
+ ftp = Net::FTP.new(nil, use_pasv_ip: true)
host, port = ftp.send(:parse227, "227 Entering Passive Mode (192,168,0,1,12,34)")
assert_equal("192.168.0.1", host)
assert_equal(3106, port)
@@ -80,6 +80,14 @@ class FTPTest < Test::Unit::TestCase
assert_raise(Net::FTPProtoError) do
ftp.send(:parse227, "227 ) foo bar (")
end
+
+ ftp = Net::FTP.new
+ sock = OpenStruct.new
+ sock.remote_address = OpenStruct.new
+ sock.remote_address.ip_address = "10.0.0.1"
+ ftp.instance_variable_set(:@bare_sock, sock)
+ host, port = ftp.send(:parse227, "227 Entering Passive Mode (192,168,0,1,12,34)")
+ assert_equal("10.0.0.1", host)
end
def test_parse228
@@ -2474,10 +2482,155 @@ EOF
end
end
+ def test_ignore_pasv_ip
+ commands = []
+ binary_data = (0..0xff).map {|i| i.chr}.join * 4 * 3
+ server = create_ftp_server(nil, "127.0.0.1") { |sock|
+ sock.print("220 (test_ftp).\r\n")
+ commands.push(sock.gets)
+ sock.print("331 Please specify the password.\r\n")
+ commands.push(sock.gets)
+ sock.print("230 Login successful.\r\n")
+ commands.push(sock.gets)
+ sock.print("200 Switching to Binary mode.\r\n")
+ line = sock.gets
+ commands.push(line)
+ data_server = TCPServer.new("127.0.0.1", 0)
+ port = data_server.local_address.ip_port
+ sock.printf("227 Entering Passive Mode (999,0,0,1,%s).\r\n",
+ port.divmod(256).join(","))
+ commands.push(sock.gets)
+ sock.print("150 Opening BINARY mode data connection for foo (#{binary_data.size} bytes)\r\n")
+ conn = data_server.accept
+ binary_data.scan(/.{1,1024}/nm) do |s|
+ conn.print(s)
+ end
+ conn.shutdown(Socket::SHUT_WR)
+ conn.read
+ conn.close
+ data_server.close
+ sock.print("226 Transfer complete.\r\n")
+ }
+ begin
+ begin
+ ftp = Net::FTP.new
+ ftp.passive = true
+ ftp.read_timeout *= 5 if defined?(RubyVM::MJIT) && RubyVM::MJIT.enabled? # for --jit-wait
+ ftp.connect("127.0.0.1", server.port)
+ ftp.login
+ assert_match(/\AUSER /, commands.shift)
+ assert_match(/\APASS /, commands.shift)
+ assert_equal("TYPE I\r\n", commands.shift)
+ buf = ftp.getbinaryfile("foo", nil)
+ assert_equal(binary_data, buf)
+ assert_equal(Encoding::ASCII_8BIT, buf.encoding)
+ assert_equal("PASV\r\n", commands.shift)
+ assert_equal("RETR foo\r\n", commands.shift)
+ assert_equal(nil, commands.shift)
+ ensure
+ ftp.close if ftp
+ end
+ ensure
+ server.close
+ end
+ end
+
+ def test_use_pasv_ip
+ commands = []
+ binary_data = (0..0xff).map {|i| i.chr}.join * 4 * 3
+ server = create_ftp_server(nil, "127.0.0.1") { |sock|
+ sock.print("220 (test_ftp).\r\n")
+ commands.push(sock.gets)
+ sock.print("331 Please specify the password.\r\n")
+ commands.push(sock.gets)
+ sock.print("230 Login successful.\r\n")
+ commands.push(sock.gets)
+ sock.print("200 Switching to Binary mode.\r\n")
+ line = sock.gets
+ commands.push(line)
+ data_server = TCPServer.new("127.0.0.1", 0)
+ port = data_server.local_address.ip_port
+ sock.printf("227 Entering Passive Mode (127,0,0,1,%s).\r\n",
+ port.divmod(256).join(","))
+ commands.push(sock.gets)
+ sock.print("150 Opening BINARY mode data connection for foo (#{binary_data.size} bytes)\r\n")
+ conn = data_server.accept
+ binary_data.scan(/.{1,1024}/nm) do |s|
+ conn.print(s)
+ end
+ conn.shutdown(Socket::SHUT_WR)
+ conn.read
+ conn.close
+ data_server.close
+ sock.print("226 Transfer complete.\r\n")
+ }
+ begin
+ begin
+ ftp = Net::FTP.new
+ ftp.passive = true
+ ftp.use_pasv_ip = true
+ ftp.read_timeout *= 5 if defined?(RubyVM::MJIT) && RubyVM::MJIT.enabled? # for --jit-wait
+ ftp.connect("127.0.0.1", server.port)
+ ftp.login
+ assert_match(/\AUSER /, commands.shift)
+ assert_match(/\APASS /, commands.shift)
+ assert_equal("TYPE I\r\n", commands.shift)
+ buf = ftp.getbinaryfile("foo", nil)
+ assert_equal(binary_data, buf)
+ assert_equal(Encoding::ASCII_8BIT, buf.encoding)
+ assert_equal("PASV\r\n", commands.shift)
+ assert_equal("RETR foo\r\n", commands.shift)
+ assert_equal(nil, commands.shift)
+ ensure
+ ftp.close if ftp
+ end
+ ensure
+ server.close
+ end
+ end
+
+ def test_use_pasv_invalid_ip
+ commands = []
+ binary_data = (0..0xff).map {|i| i.chr}.join * 4 * 3
+ server = create_ftp_server(nil, "127.0.0.1") { |sock|
+ sock.print("220 (test_ftp).\r\n")
+ commands.push(sock.gets)
+ sock.print("331 Please specify the password.\r\n")
+ commands.push(sock.gets)
+ sock.print("230 Login successful.\r\n")
+ commands.push(sock.gets)
+ sock.print("200 Switching to Binary mode.\r\n")
+ line = sock.gets
+ commands.push(line)
+ sock.print("227 Entering Passive Mode (999,0,0,1,48,57).\r\n")
+ commands.push(sock.gets)
+ }
+ begin
+ begin
+ ftp = Net::FTP.new
+ ftp.passive = true
+ ftp.use_pasv_ip = true
+ ftp.read_timeout *= 5 if defined?(RubyVM::MJIT) && RubyVM::MJIT.enabled? # for --jit-wait
+ ftp.connect("127.0.0.1", server.port)
+ ftp.login
+ assert_match(/\AUSER /, commands.shift)
+ assert_match(/\APASS /, commands.shift)
+ assert_equal("TYPE I\r\n", commands.shift)
+ assert_raise(SocketError) do
+ ftp.getbinaryfile("foo", nil)
+ end
+ ensure
+ ftp.close if ftp
+ end
+ ensure
+ server.close
+ end
+ end
+
private
- def create_ftp_server(sleep_time = nil)
- server = TCPServer.new(SERVER_ADDR, 0)
+ def create_ftp_server(sleep_time = nil, addr = SERVER_ADDR)
+ server = TCPServer.new(addr, 0)
@thread = Thread.start do
if sleep_time
sleep(sleep_time)
--
2.17.1
|
