Subject: libnfsidmap: Virtual domains/users handling with at sign in idmap
Package: libnfsidmap
Version: 0.23
Severity: normal
Tags: patch
*** Please type your report below this line ***
Idmap fails to map uid to localname or vice versa in case an 'at' ( @ ) sign
is included in the localname.
This is particularly the case of virtual domains username where
a user@virtual_domain is in fact the username and its @ sign conflicts with
username@idmap_domain format used by idmap to handle uid/localname
conversions.
Where username = user@virtual_domain.
Idmap is still able to map uid/localname correctly when the username
does not
include an @ sign.
Both NFS Server and Client are PAM/NSS clients of an OpenLDAP Server that
handles users & groups. NFSv4 is used and without kerberos and "nsswitch"
Translation method is used rather than umich_ldap.
Idmap looks for the first occurrence of and @ sign in the name string
and assumes that the @ sign is the one of user@virtual_domain rather than
using the one of username@idmap_domain (user@virtual_domain@idmap_domain).
The function "strip_domain" is defined in nss.c file and uses "strchr"
function on line 138 to find the first occurrence of an @ sign from the name
string.
As the name string includes 2 occurrences, the domain resulting from that
(virtual_domain@idmap_domain) fails to match with the configured idmap
domain
(idmap_domain) and this causes idmap returning a null value.
Switching from "strchr" to "strrchr" simply fix the problem as it would look
for the last occurrence rather than the first one and therefore has a
resulting
domain that matched the idmap one.
This obviously makes sense as a URI should be read from right to left
and not
from left to right when handling domains.
The idmap domain is this way the root domain and all virtual domains
included
in the username it handles will not conflicts with it.
A patch is included here below :
libnfsidmap_0.23_fix_at_sign_user_with_domain.diff
//////////////////////////////////////////////////////////////////
--- libnfsidmap-0.23.orig/nss.c 2009-07-29 22:19:06.000000000 +0200
+++ libnfsidmap-0.23/nss.c 2010-05-11 15:02:13.000000000 +0200
@@ -135,7 +135,7 @@
char *l = NULL;
int len;
- c = strchr(name, '@');
+ c = strrchr(name, '@');
if (c == NULL && domain != NULL)
goto out;
if (c == NULL && domain == NULL) {
//////////////////////////////////////////////////////////////////
The patch applies to all archs.
Versions checked :
Debian :
libnfsidmap2 0.18-0 (oldstable)
libnfsidmap2 0.20-1 (stable)
libnfsidmap2 0.23-2 (testing,unstable)
-- System Information:
Debian Release: 5.0.4
APT prefers stable
APT policy: (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.26-2-amd64 (SMP w/1 CPU core)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages libnfsidmap2 depends on:
ii libc6 2.7-18lenny2 GNU C Library: Shared libraries
ii libldap-2.4-2 2.4.11-1+lenny1 OpenLDAP libraries
Ramzi HABIB
ramzi <at> nomado.eu
You're welcome.
The patch fixes the problem if not using kerberos.
I checked the latest version (0.23, in testing and unstable packages.
Doesn't apply for oldstable and stable ones) from citi's website and it
seems there's an additional fix to make for function
"nss_gss_princ_to_ids" in nss.c file on line 279 :
/////////////////////////////////////////////////
/* get princ's realm */
princ_realm = strstr(princ, "@");
if (princ_realm == NULL)
return -EINVAL;
princ_realm++;
////////////////////////////////////////////////
I'll check that soon and get back to you with the results.
Ramzi
Le 11/05/2010 15:07, Kevin Coffman a ?crit :
> Thanks. Unless someone else sees a problem with this, I'll apply it.
>
> On Tue, May 11, 2010 at 9:07 AM, HABIB Ramzi<[email protected]> wrote:
>
>> Subject: libnfsidmap: Virtual domains/users handling with at sign in idmap
>> Package: libnfsidmap
>> Version: 0.23
>> Severity: normal
>> Tags: patch
>>
>> *** Please type your report below this line ***
>>
>> Idmap fails to map uid to localname or vice versa in case an 'at' ( @ ) sign
>> is included in the localname.
>> This is particularly the case of virtual domains username where
>> a user@virtual_domain is in fact the username and its @ sign conflicts with
>> username@idmap_domain format used by idmap to handle uid/localname
>> conversions.
>> Where username = user@virtual_domain.
>> Idmap is still able to map uid/localname correctly when the username does
>> not
>> include an @ sign.
>> Both NFS Server and Client are PAM/NSS clients of an OpenLDAP Server that
>> handles users& groups. NFSv4 is used and without kerberos and "nsswitch"
>> Translation method is used rather than umich_ldap.
>> Idmap looks for the first occurrence of and @ sign in the name string
>> and assumes that the @ sign is the one of user@virtual_domain rather than
>> using the one of username@idmap_domain (user@virtual_domain@idmap_domain).
>> The function "strip_domain" is defined in nss.c file and uses "strchr"
>> function on line 138 to find the first occurrence of an @ sign from the name
>> string.
>> As the name string includes 2 occurrences, the domain resulting from that
>> (virtual_domain@idmap_domain) fails to match with the configured idmap
>> domain
>> (idmap_domain) and this causes idmap returning a null value.
>> Switching from "strchr" to "strrchr" simply fix the problem as it would look
>> for the last occurrence rather than the first one and therefore has a
>> resulting
>> domain that matched the idmap one.
>> This obviously makes sense as a URI should be read from right to left and
>> not
>> from left to right when handling domains.
>> The idmap domain is this way the root domain and all virtual domains
>> included
>> in the username it handles will not conflicts with it.
>>
>> A patch is included here below :
>>
>> libnfsidmap_0.23_fix_at_sign_user_with_domain.diff
>>
>> //////////////////////////////////////////////////////////////////
>>
>> --- libnfsidmap-0.23.orig/nss.c 2009-07-29 22:19:06.000000000 +0200
>> +++ libnfsidmap-0.23/nss.c 2010-05-11 15:02:13.000000000 +0200
>> @@ -135,7 +135,7 @@
>> char *l = NULL;
>> int len;
>>
>> - c = strchr(name, '@');
>> + c = strrchr(name, '@');
>> if (c == NULL&& domain != NULL)
>> goto out;
>> if (c == NULL&& domain == NULL) {
>>
>> //////////////////////////////////////////////////////////////////
>>
>> The patch applies to all archs.
>> Versions checked :
>> Debian :
>> libnfsidmap2 0.18-0 (oldstable)
>> libnfsidmap2 0.20-1 (stable)
>> libnfsidmap2 0.23-2 (testing,unstable)
>>
>> -- System Information:
>> Debian Release: 5.0.4
>> APT prefers stable
>> APT policy: (500, 'stable')
>> Architecture: amd64 (x86_64)
>>
>> Kernel: Linux 2.6.26-2-amd64 (SMP w/1 CPU core)
>> Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
>> Shell: /bin/sh linked to /bin/bash
>>
>> Versions of packages libnfsidmap2 depends on:
>> ii libc6 2.7-18lenny2 GNU C Library: Shared libraries
>> ii libldap-2.4-2 2.4.11-1+lenny1 OpenLDAP libraries
>>
>> Ramzi HABIB
>> ramzi<at> nomado.eu
>>
>>
> __________ Information provenant d'ESET Smart Security, version de la base des signatures de virus 5105 (20100511) __________
>
> Le message a ?t? v?rifi? par ESET Smart Security.
>
> http://www.eset.com
>
>
>
>
>
Thanks. Unless someone else sees a problem with this, I'll apply it.
On Tue, May 11, 2010 at 9:07 AM, HABIB Ramzi <ramzi-nj/[email protected]> wrote:
> Subject: libnfsidmap: Virtual domains/users handling with at sign in =
idmap
> Package: libnfsidmap
> Version: 0.23
> Severity: normal
> Tags: patch
>
> *** Please type your report below this line ***
>
> Idmap fails to map uid to localname or vice versa in case an 'at' ( @=
) sign
> is included in the localname.
> This is particularly the case of virtual domains username where
> a user@virtual_domain is in fact the username and its @ sign conflict=
s with
> username@idmap_domain format used by idmap to handle uid/localname
> conversions.
> Where username =3D user@virtual_domain.
> Idmap is still able to map uid/localname correctly when the username =
does
> not
> include an @ sign.
> Both NFS Server and Client are PAM/NSS clients of an OpenLDAP Server =
that
> handles users & groups. NFSv4 is used and without kerberos and "nsswi=
tch"
> Translation method is used rather than umich_ldap.
> Idmap looks for the first occurrence of and @ sign in the name string
> and assumes that the @ sign is the one of user@virtual_domain rather =
than
> using the one of username@idmap_domain (user@virtual_domain@idmap_dom=
ain).
> The function "strip_domain" is defined in nss.c file and uses "strchr=
"
> function on line 138 to find the first occurrence of an @ sign from t=
he name
> string.
> As the name string includes 2 occurrences, the domain resulting from =
that
> (virtual_domain@idmap_domain) fails to match with the configured idma=
p
> domain
> (idmap_domain) and this causes idmap returning a null value.
> Switching from "strchr" to "strrchr" simply fix the problem as it wou=
ld look
> for the last occurrence rather than the first one and therefore has a
> resulting
> domain that matched the idmap one.
> This obviously makes sense as a URI should be read from right to left=
and
> not
> from left to right when handling domains.
> The idmap domain is this way the root domain and all virtual domains
> included
> in the username it handles will not conflicts with it.
>
> A patch is included here below :
>
> libnfsidmap_0.23_fix_at_sign_user_with_domain.diff
>
> //////////////////////////////////////////////////////////////////
>
> --- libnfsidmap-0.23.orig/nss.c =A0 =A02009-07-29 22:19:06.000000000 =
+0200
> +++ libnfsidmap-0.23/nss.c =A0 =A02010-05-11 15:02:13.000000000 +0200
> @@ -135,7 +135,7 @@
> =A0 =A0 char *l =3D NULL;
> =A0 =A0 int len;
>
> - =A0 =A0c =3D strchr(name, '@');
> + =A0 =A0c =3D strrchr(name, '@');
> =A0 =A0 if (c =3D=3D NULL && domain !=3D NULL)
> =A0 =A0 =A0 =A0 goto out;
> =A0 =A0 if (c =3D=3D NULL && domain =3D=3D NULL) {
>
> //////////////////////////////////////////////////////////////////
>
> The patch applies to all archs.
> Versions checked :
> Debian :
> libnfsidmap2 0.18-0 (oldstable)
> libnfsidmap2 0.20-1 (stable)
> libnfsidmap2 0.23-2 (testing,unstable)
>
> -- System Information:
> Debian Release: 5.0.4
> =A0APT prefers stable
> =A0APT policy: (500, 'stable')
> Architecture: amd64 (x86_64)
>
> Kernel: Linux 2.6.26-2-amd64 (SMP w/1 CPU core)
> Locale: LANG=3Dfr_FR.UTF-8, LC_CTYPE=3Dfr_FR.UTF-8 (charmap=3DUTF-8)
> Shell: /bin/sh linked to /bin/bash
>
> Versions of packages libnfsidmap2 depends on:
> ii =A0libc6 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 2.7-18lenny2 =
GNU C Library: Shared libraries
> ii =A0libldap-2.4-2 =A0 =A0 =A0 =A0 =A0 =A0 =A0 2.4.11-1+lenny1 =A0 O=
penLDAP libraries
>
> Ramzi HABIB
> ramzi <at> nomado.eu
>