Dear all,
the change in include/sasl.h
-#define SASL_SEC_MAXIMUM 0x00FF
+#define SASL_SEC_MAXIMUM 0xFFFF
breaks sendmail’s AuthOptions, when it has the “A” flag set.
Following text is for users compiling Sendmail using unreleased Cyrus
SASL.
Sendmail/sendmail.h has these definitions:
# define SASL_AUTH_AUTH 0x1000 /* use auth= only if authenticated */
# if SASL >= 20101
# define SASL_SEC_MASK SASL_SEC_MAXIMUM
# endif
and SASL_SEC_MAXIMUM is 0xFFFF.
The “A” flag sets sets the 0x1000 bit in SASLOpts and later calls:
ssp.security_flags = SASLOpts & SASL_SEC_MASK;
Now within Cyrus SASL code the 0x1000 bit is set for security_flags.
lib/server.c:mech_permitted() has this code:
/* do we want to special case SASL_SEC_PASS_CREDENTIALS? nah.. */
if ((myflags &= (myflags ^ plug->security_flags)) != 0) {
sasl_seterror(conn, SASL_NOLOG,
"security flags do not match required");
return (myflags & SASL_SEC_NOPLAINTEXT) ? SASL_ENCRYPT : SASL_NOMECH;
}
myflags has values like 4112 or 4113, where the 0x1000 bit is set.
This flag is not cleared, so no mechanism have the required
security_flags. In turn, on EHLO sendmail prints no 250-AUTH line, as
no mechanism matches the security criteria.
Removing the A Option from AuthOption solves the problem. Appending a
zero to “# define SASL_AUTH_AUTH 0x1000” might also help.
Greetings
Дилян
On Tue, 2021-11-16 at 14:50 -0800, Quanah Gibson-Mount wrote:
> Hi everyone,
>
> The cyrus-sasl-2.1 branch is ready for testing for the proposed
> 2.1.28
> Cyrus SASL release. For those who know how to build from source, it
> would
> be great if you can test and verify things work as expected. If you
> have a
> kerberos based environment that makes use of SASL/GSSAPI for a
> variety of
> purposes, please note that in any feedback.
>
> A general list of fixed issues for this release can be found at:
>
> <https://github.com/cyrusimap/cyrus-sasl/milestone/2?closed=1>
>
> Thanks in advance!
>
> Regards,
> Quanah
>
> --
>
> Quanah Gibson-Mount
> Product Architect
> Symas Corporation
> Packaged, certified, and supported LDAP solutions powered by
> OpenLDAP:
> <http://www.symas.com>
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Cyrus: SASL
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