Frits Jalvingh created DIRMINA-1143:
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Summary: sftp authentication fails with "Incorrect identification
(null characters not allowed) - at line 1 character #1 after ''
Key: DIRMINA-1143
URL: https://issues.apache.org/jira/browse/DIRMINA-1143
Project: MINA
Issue Type: Bug
Components: Core
Environment: Ubuntu Linux 18.04, Java 11.
Reporter: Frits Jalvingh
I am having this intermittent error when authenticating to an sftp server. It
is always the same server and always the same program; connecting fails about
once every 5 times with this error coming from SessionHelper.java, method
doReadIdentification. I had this error before and upgraded to Mina 2.6.0 from
maven (org.apache.sshd, sshd-core et al) but that changed nothing. The code
runs on Ubuntu Linux 18.04 (Azure, sigh) with Java 11.I tried to do some
debugging and for that I changed SessionHelper so that it dumps the information
that it is trying to read at that time from its buffer. Because that always
died with that NUL character as the first character read I made the code
continue to read a bit so that there might be some context.. What is present in
that buffer at this time is this:
{{0000: 00 00 01 d4 0b 14 8a e8 5f 65 22 7b 97 4f 2d 61 ........_e"{.O-a}}
{{0010: 12 75 19 81 6e 1a 00 00 00 47 64 69 66 66 69 65 .u..n....Gdiffie}}
{{0020: 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 -hellman-group-e}}
{{0030: 78 63 68 61 6e 67 65 2d 73 68 61 32 35 36 2c 64 xchange-sha256,d}}
{{0040: 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 iffie-hellman-gr}}
{{0050: 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 oup-exchange-sha}}
{{0060: 31 00 00 00 0f 73 73 68 2d 72 73 61 2c 73 73 68 1....ssh-rsa,ssh}}
{{0070: 2d 64 73 73 00 00 00 41 61 65 73 31 32 38 2d 63 -dss...Aaes128-c}}
{{0080: 74 72 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 tr,aes192-ctr,ae}}
{{0090: 73 32 35 36 2d 63 74 72 2c 61 65 73 31 32 38 2d s256-ctr,aes128-}}
{{00a0: 63 62 63 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 cbc,aes192-cbc,a}}
{{00b0: 65 73 32 35 36 2d 63 62 63 00 00 00 41 61 65 73 es256-cbc...Aaes}}
{{00c0: 31 32 38 2d 63 74 72 2c 61 65 73 31 39 32 2d 63 128-ctr,aes192-c}}
{{00d0: 74 72 2c 61 65 73 32 35 36 2d 63 74 72 2c 61 65 tr,aes256-ctr,ae}}
{{00e0: 73 31 32 38 2d 63 62 63 2c 61 65 73 31 39 32 2d s128-cbc,aes192-}}
{{00f0: 63 62 63 2c 61 65 73 32 35 36 2d 63 62 63 00 cbc,aes256-cbc.}}
The error occurs when reading that 00 at offset 0000; the rest of the data is
there by looking into the rest of that buffer..
I can quite easily reproduce this, so if more data is needed I should be able
to provide it..
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