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Reported-by: Michael Osipov
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* Prefer dereference of string pointer rather than strlen()
* Free challenge pointer in one place
* Additional comments
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This wouldn't cause a problem because of the way the function is called,
but prior to this change, we were processing the challenge message when
the credentials were NULL rather than when the challenge message was
populated.
This also brings this part of the Kerberos 5 code in line with the
Negotiate code.
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Although mutual authentication is currently turned off and can only be
enabled by changing libcurl source code, authentication using Kerberos
5 has been broken since commit 79543caf90 in this use case.
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Prior to this change, we were generating the SPN in the SSPI code when
the credentials were NULL and in the GSS-API code when the context was
empty. It is better to decouple the SPN generation from these checks
and only generate it when the SPN itself is NULL.
This also brings this part of the Kerberos 5 code in line with the
Negotiate code.
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For consistency with the spnego code.
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For consistency with the spnego and oauth2 code moved the setting of
the host name outside of the Curl_auth_create_gssapi_user_messag()
function.
This will allow us to more easily override it in the future.
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Also display the GSS_C_GSS_CODE (major code) when specified instead of
only GSS_C_MECH_CODE (minor code).
In addition, the old code was printing a colon twice after the prefix
and also miscalculated the length of the buffer in between calls to
gss_display_status (the length of ": " was missing).
Also, gss_buffer is not guaranteed to be NULL terminated and thus need
to restrict reading by its length.
Closes #738
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Renamed all the SASL functions that moved to the new vauth directory to
include the correct module name.
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