[asterisk-bugs] [JIRA] (ASTERISK-27304) Registration with digest authentication in PJSIP fails if a username contains symbol @

[Oleg (JIRA)]

Oleg created ASTERISK-27304:
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             Summary: Registration with digest authentication in PJSIP fails if a username contains symbol @
                 Key: ASTERISK-27304
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27304
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: pjproject/pjsip
    Affects Versions: 13.16.0
         Environment: Operating system:
CentOS7, x86_64, kernel 3.10.0-514.

            Reporter: Oleg
            Severity: Minor


For an endpoint with outbound authetication enabled, it is required to provide username in the format “user at domain”. However, outbound authentication fails in case username contains symbol “@” and PJSIP channel driver is used.

The following options were attempted to resolve this issue.

Option 1. Provide username in section “auth” in the format:
username= +74852207186@ yar.ims.ctc.ru
In this case, Asterisk does not identify the endpoint or send any SIP requests to it. It also provides the following errors in the log:
ERROR[28847] res_pjsip_outbound_registration.c: Invalid client URI 'sip: +74852207186 at yar.ims.ctc.ru@10.1.1.1:5060' specified on outbound registration 'RostelecomPJ'
ERROR[28847] res_pjsip/pjsip_options.c: Unable to create request to qualify contact sip: +74852207186@ yar.ims.ctc.ru @10.1.1.1:5060

Option 2. Provide username in section “auth” in the format:
	username= “+2@ yar.ims.ctc.ru”
In this case, Asterisk identifies the endpoint and start sending OPTIONS and REGISTER requests. However, SIP digest authentication response generated by Asterisk contains an incorrect value.
Manipulations with SIP Digest Calculator application reveal that values of “response” parameter generated by Asterisk and by this calculator are identical when the full username, including quotes, is taken as an argument. This makes it impossible to work with usernames containing @, but not containing quote symbols.
Considering that the same username works with chan_sip driver, it is suggested to enable either Option 1 or Option 2 in PJSIP, namely:
•	allow providing symbol “@” in the username, or
•	exclude quotes around username when this argument is used for SIP digest response calculation.



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