Re: [PATCH] svcgss: reply AUTH_BADCRED to RPCSEC_GSS with unkown services

Wei Yongjun
2009-08-26T00:37:20Z

J. Bruce Fields wrote:
> On Tue, Aug 04, 2009 at 05:27:52PM +0800, Wei Yongjun wrote:
>
>> When RPC messages is received with RPCSEC_GSS, and if the RPCSEC_GSS
>> include unkown services (not RPC_GSS_SVC_NONE, RPC_GSS_SVC_INTEGRITY
>> and RPC_GSS_SVC_PRIVACY), the response is considered as AUTH_BADCRED
>> in svcauth_gss_accept(), but the response be drop by
>> svcauth_gss_release(). I think response with AUTH_BADCRED is correct
>> one. So this patch fixed it.
>>
>
> Thanks! How did you find this? (And how did you test the result?)
>

I test this used newpynfs, the GSS8 item test for this.
#./testserver.py nfsserver:/ --security=krb5 GSS8

>
>> diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c
>> index 2278a50..6dce327 100644
>> --- a/net/sunrpc/auth_gss/svcauth_gss.c
>> +++ b/net/sunrpc/auth_gss/svcauth_gss.c
>> @@ -1370,7 +1370,7 @@ svcauth_gss_release(struct svc_rqst *rqstp)
>> goto out_err;
>> break;
>> default:
>> - goto out_err;
>> + goto out;
>> }
>>
>> out:
>>
>
> The goto seems redundant. How about just leaving out the default case
> and providing a comment? (See below.)
>
> --b.
>
> commit ab3654a05aaf367b23bbb3d9229ff72a11999719
> Author: Wei Yongjun <yjwei@cn.fujitsu.com>
> Date: Tue Aug 4 17:27:52 2009 +0800
>
> svcgss: reply AUTH_BADCRED to RPCSEC_GSS with unknown service
>
> When an RPC message is received with RPCSEC_GSS with an unknown service
> (not RPC_GSS_SVC_NONE, RPC_GSS_SVC_INTEGRITY, or RPC_GSS_SVC_PRIVACY),
> svcauth_gss_accept() returns AUTH_BADCRED, but svcauth_gss_release()
> subsequently drops the response entirely, discarding the error.
>
> Fix that so the AUTH_BADCRED error is returned to the client.
>
> Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
>
> diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c
> index 2e6a148..f6c51e5 100644
> --- a/net/sunrpc/auth_gss/svcauth_gss.c
> +++ b/net/sunrpc/auth_gss/svcauth_gss.c
> @@ -1374,8 +1374,10 @@ svcauth_gss_release(struct svc_rqst *rqstp)
> if (stat)
> goto out_err;
> break;
> - default:
> - goto out_err;
> + /*
> + * For any other gc_svc value, svcauth_gss_accept() already set
> + * the auth_error appropriately; just fall through:
> + */
> }
>
> out:
>
>
>
>