dovecot - Sep 2005 - auth protocol, buffers

Hello Timo,

I'm curious about 2 points (I'm using alpha2 but these are general
questions) :

Background : 

  . I connect to dovecot-1.0.alpha2 through thunderbird
  . I use ldap pass/userdb and PLAIN mech
  . I've only got one auth block in dovecot.conf (all pass/userdb/mech
    except ldap/PLAIN are commented)

  1) I notice that, for one thunderbird connection trial, imap-login
     issues 2 AUTH messages. Why ? What info does the "resp=" hold the
second
     time ? It goes like this :

	Info: Dovecot v1.0.alpha2 starting up
	Info: auth(default): client in: AUTH   1       PLAIN   service=IMAP    
lip=xxx.xxx.xxx.xxx        rip=xxx.xxx.xxx.xxx
	Info: auth(default): client out: CONT  1
	Info: auth(default): client in: CONT   1       AGRvdmV0ZXN0AGZvbw=	Info:
auth(default): ldap(dovetest,xxx.xxx.xxx.xxx): base=ou=personnes, dc=pasteur,
dc=fr scope=subtree filter=(&(objectClass=posixAccount)(uid=dovetest))
fields=uid,userPassword
	Info: auth(default): ldap(dovetest,xxx.xxx.xxx.xxx):
userPassword(password)={CRYPT}sa8ufSVwLUHVU uid(user)=dovetest
	Info: auth(default): client out: FAIL  1       user=dovetest
	Info: auth(default): client in: AUTH   2       PLAIN   service=IMAP    
lip=xxx.xxx.xxx.xxx        rip=xxx.xxx.xxx.xxx        resp=AGRvdmV0ZXN0AGZvbw=
Info: auth(default): ldap(dovetest,157.99.64.42): base=ou=personnes, dc=pasteur,
dc=fr scope=subtree filter=(&(objectClass=posixAccount)(uid=dovetest))
fields=uid,userPassword
	Info: auth(default): ldap(dovetest,157.99.64.42):
userPassword(password)={CRYPT}sa8ufSVwLUHVU uid(user)=dovetest
dovecot: Sep 20 17:58:27 Info: auth(default): client out: FAIL  2      
user=dovetest


  2) Which buffer/string handling function (among those in your lib)
     should I use to safely allocate a string and/or copy a string into
     another ? (instead of using str[n|l]cpy for instance) ?

Thank you.

-- 
Thomas Hummel 	    | Institut Pasteur
<hummel at pasteur.fr> | P?le informatique - syst?mes et r?seau

On Tue, 2005-09-20 at 19:29 +0200, Thomas Hummel wrote:
> Hello Timo,
> 
> I'm curious about 2 points (I'm using alpha2 but these are general
> questions) :
> 
> Background : 
> 
>   . I connect to dovecot-1.0.alpha2 through thunderbird
>   . I use ldap pass/userdb and PLAIN mech
>   . I've only got one auth block in dovecot.conf (all pass/userdb/mech
>     except ldap/PLAIN are commented)
> 
>   1) I notice that, for one thunderbird connection trial, imap-login
>      issues 2 AUTH messages. Why ? What info does the "resp="
hold the second
>      time ? It goes like this :
Have you checked if it's just because Thunderbird sends it twice? It
looks like it first tries with AUTHENTICATE PLAIN command, and after
that with LOGIN command. The resp= parameter is the "initial
response",
same as in the above CONT's parameter. And it contains the username and
password base64 encoded. Internally Dovecot converts LOGIN command to
PLAIN authentication with the initial response set.
>   2) Which buffer/string handling function (among those in your lib)
>      should I use to safely allocate a string and/or copy a string into
>      another ? (instead of using str[n|l]cpy for instance) ?
Depends on what you want to do.. string_t type is useful if you want to
build the string from many parts (lib/str.h). Then there are also other
commands such as *_strdup_printf() in lib/strfuncs.h.
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