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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: Auth method negotiationOK - Julo
Julian: So now the last sentence of your suggested text reads: "If the next stage is FullFeaturePhase, the target MUST respond with a Login Response with the TSIH and the selected protocol version." However, I still would like to see the phrase "and the selected protocol version" removed, because ALL Login Responses sent by the target must contain the selected protocol version -- there is nothing special about the Login Response that causes the transition into FullFeaturePhase with respect to the protocol version information (i.e., the version-active field), but adding this phrase makes it sound as if there is. Thank you for your consideration. Bob Russell > > > Bob, > > Comments in text. > > Thanks, > Julo > > > "Robert D. Russell" <rdr@io.iol.unh.edu> > > 06/22/2002 06:25 PM > Please respond to "Robert D. Russell" > > To: Julian Satran/Haifa/IBM@IBMIL > cc: ips@ece.cmu.edu > Subject: RE: Auth method negotiation > > > > Julian: > > Just two minor comments -- in the very last sentence of > your suggested text ends with "and the protocol version". > Why is this necessary -- doesn't every Login response > have to carry identical values for version-max and > version-active? Is the value in version-active > what you mean by "protocol version"? If so, I would just > omit this phrase (because it raises the question as to > whether or not previous Login responses need to carry > version-active). > > +++ Version selected - the initiator has version min and max in the Login > request. > I should perhaps add selected +++ > > Second comment -- the term "session id". Do you mean the TSIH? > If so, I believe it should say TSIH explicitly. If not, then > what do you mean - the full ISID/TSIH? If so, then again > this is misleading because all Login Responses have to carry > the ISID offered in the first Login Request. > > +++ I will replace session ID with TSIH +++ > Thanks, > Bob Russell > > > On Sat, 22 Jun 2002, Julian Satran wrote: > > > > > How about the following text: > > > > -When the initiator considers that it ready to conclude the > > SecurityNegotiation stage it sets the T bit to 1 and the > NSG to > > what it would like the next stage to be. The target will > then > > set the T bit to 1 and set NSG to the next stage in the > Login > > response where it finishes sending its security keys. The > next > > stage selected will be the one the target selected. If the > next > > stage is FullFeaturePhase, the target MUST respond with a > Login > > Response with the Session ID and the protocol version. > > Julo > > > > > > > > pat_thaler@agilen > > t.com To: > wrstuden@wasabisystems.com, chirag.wighe@windriver.com > > Sent by: cc: > ips@ece.cmu.edu > > owner-ips@ece.cmu Subject: RE: Auth > method negotiation > > .edu > > > > > > 06/22/2002 03:01 > > AM > > Please respond to > > pat_thaler > > > > > > > > > > > > Bill, > > > > I agree that the target made an error in sending T=1 when it chose an > > authentication method. > > > > However, even if it was willing to skip negotiation it must return CHAP > > when offered AuthMethod=KRB5,SRP,CHAP,None. > > > > 4.3.2 says "-The target MUST reply with the first option in the list it > > supports and is allowed to use for the specific initiator > > unless it does not support any in which case it MUST answer > > with "Reject" (see also Section 4.2 Text Mode Negotiation). > > The parameters are encoded in UTF8 as key=value. For security > > parameters, see Chapter 10." > > > > So if the target supports CHAP and is allowed to use CHAP for an > initiator > > it MUST reply with CHAP or an earlier alternative in the list when > offered > > CHAP before None for AuthMethod. It cannot reply None. If the initiator > > would have preferred "None" over "CHAP" it should have placed it before > > CHAP in the list. > > > > I think that the next text in 4.3.2 is a bit confusing: > > "-The initiator must be aware of the imminent completion of the > > SecurityNegotiation stage and MUST set the T bit to 1 and the > > NSG to what it would like the next stage to be. The target > > will answer with a Login response with the T bit set to 1 and > > the NSG to what it would like the next stage to be. The next > > stage selected will be the one the target selected. If the > > next stage is FullFeaturePhase, the target MUST respond with > > a Login Response with the Session ID and the protocol version." > > > > I think "aware of imminent completion" means that the target has sent > its > > last key=value of the security negotiation but it doesn't seem a very > clear > > way to say it. > > Also, the next sentence is not always true. The target might not be > ready > > to set the T bit in the answering Login Response. It might have > required > > more than one PDU to send its final key(s) of the security negotiation. > > "The target will then set the T bit to 1 and set NSG to the next stage > in > > the Login response where it finishes sending its security keys." would > be > > more accurate. > > > > Pat > > > > -----Original Message----- > > From: Bill Studenmund [mailto:wrstuden@wasabisystems.com] > > Sent: Friday, June 21, 2002 4:19 PM > > To: Chirag Wighe > > Cc: ips@ece.cmu.edu > > Subject: Re: Auth method negotiation > > > > > > On Fri, 21 Jun 2002, Chirag Wighe wrote: > > > > > Hi > > > > > > I am sorry for the typo but I cut and paste from the spec. In the > spec on > > > page 245 for example it says > > > If the initiator authentication is successful, the target proceeds: > > > T- Login (CSG,NSG=0,1 T=1) > > > I- Login (CSG,NSG=1,0 T=0) > > > > Oh, if T=0, then NSG is reserved, and should have the value 0. > > > > > ... iSCSI parameters > > > T- Login (CSG,NSG=1,0 T=0) > > > ... iSCSI parameters > > > > > > I did a search and there are several other 1,0 transitions in the > spec. > > > > Were they transitions, i.e. T=1? Or just notifications of continuing > > operational parameter negotiation? That's what (CSG,NSG=1,0 T=0) is. > > > > > Anyway what I meant was what Bill intepreted it to be which was > > > Login (CSG,NSG=0,1 T=1) > > > InitiatorName=iqn.1999-07.com.os.hostid.77 > > > TargetName=iqn.1999-07.com.acme.diskarray.sn.88 > > > AuthMethod=KRB5,SRP,CHAP,None > > > > > > and the target replying > > > T- Login-PR (CSG,NSG=0,1 T=1) > > > AuthMethod=CHAP > > > > > > and then my other questions hopefully make more sense. > > > > I think the concensus is that the target made an error. If it was > willing > > to skip security negotiations (T=1, NSG=1), it shouldn't have chosen > CHAP. > > > > Take care, > > > > Bill > > > > > > > > > > > >
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