IBM Support

IT28655: DSA SSH AUTHENTICATION ERROR IN LINUX SFTP SERVER USING DSA KEYS

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APAR status

  • Closed as program error.

Error description

  • IBM Sterling B2B Integrator V5.2.6.3_9 generates an invalid
    signature specifically for DSA SSH Keys.
    
    Error observed on the SFTP UNIX Server:
    
    
    fatal: bad sigbloblen 48 != SIGBLOB_LEN dsa ssh authentication
    
    Error in sftpclient.log:
    [2019-02-12 08:40:28.347] DEBUG Session.beginSession(BSR,R,PT)
    getting the keyid info for key name :
    PNN_SI_QA_SFTP_UserId_KEY_SSH_DSS_2048
    [2019-02-12 08:40:28.353] DEBUG Session.beginSession(BSR,R,PT)
    getting the private key part based on key name :
    PNN_SI_QA_SFTP_UserId_KEY_SSH_DSS_2048
    [2019-02-12 08:40:28.353] DEBUG Session.beginSession(BSR,R,PT)
    getting the public key part based on key name :
    PNN_SI_QA_SFTP_UserId_KEY_SSH_DSS_2048
    [2019-02-12 08:40:28.364] ERROR Session.beginSession(BSR,R,PT)
    runnable caught exception. SSH_DISCONNECT_BY_APPLICATION:SFTP
    session channel closed by server.
    [2019-02-12 08:40:28.364] ERROR [1549957228364] EOF received
    from remote side [Unknown cause]
    [2019-02-12 08:40:28.364] ERRORDTL
    [1549957228364]com.maverick.ssh.SshException: EOF received from
    remote side [Unknown cause]
        at com.maverick.ssh2.TransportProtocol.b(Unknown Source)
        at com.maverick.ssh2.TransportProtocol.j(Unknown Source)
        at com.maverick.ssh2.TransportProtocol.nextMessage(Unknown
    Source)
        at
    com.maverick.ssh2.AuthenticationProtocol.readMessage(Unknown
    Source)
        at
    com.maverick.ssh2.Ssh2PublicKeyAuthentication.authenticate(Unkno
    wn Source)
        at
    com.maverick.ssh2.AuthenticationProtocol.authenticate(Unknown
    Source)
        at com.maverick.ssh2.Ssh2Client.authenticate(Unknown Source)
        at
    com.sterlingcommerce.woodstock.services.sftpclient.client.Sessio
    n.authenticateToServer(Session.java:1528)
        at
    com.sterlingcommerce.woodstock.services.sftpclient.client.Sessio
    n.access$1300(Session.java:122)
        at
    com.sterlingcommerce.woodstock.services.sftpclient.client.Sessio
    n$1.run(Session.java:377)
        at
    EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(Unkno
    wn Source)
        at java.lang.Thread.run(Thread.java:798)
    
    The DSA Key is 2048 bits long.
    

Local fix

  • STRRTC - 580096
    GB / GB
    Circumvention: None
    

Problem summary

  • USERS AFFECTED:
    ALL
    
    PROBLEM DESCRIPTION:
    DSA SSH authentication error in Linux SFTP Server using DSA Keys
    in IBM Sterling B2B Integrator 5.2.6.3 IFix 9.
    
    PLATFORMS AFFECTED:
    ALL
    

Problem conclusion

  • RESOLUTION SUMMARY:
    
    A code fix is provided.
    
    
    DELIVERED IN:
    5020603_10
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT28655

  • Reported component name

    STR B2B INTEGRA

  • Reported component ID

    5725D0600

  • Reported release

    526

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-04-03

  • Closed date

    2019-05-13

  • Last modified date

    2019-05-17

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    STR B2B INTEGRA

  • Fixed component ID

    5725D0600

Applicable component levels

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SS3JSW","label":"IBM Sterling B2B Integrator"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"5.2.6","Edition":"","Line of Business":{"code":"LOB02","label":"AI Applications"}}]

Document Information

Modified date:
17 May 2019