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authorAndrew Bartlett <abartlet@samba.org>2005-12-22 06:50:04 +0000
committerGerald (Jerry) Carter <jerry@samba.org>2007-10-10 13:47:36 -0500
commit9a9cb35cbd96d813f047c4b57a8b8c0c0cb7c25b (patch)
treef105feca1c341f8298848386454cccf21e293a58 /source4/auth
parent8e0948bbad959f8809a19e40e6777705013f866c (diff)
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r12422: Some kerberos comments and clarifications.
Andrew Bartlett (This used to be commit 31046cd22b45de6c62c9f122a81cfc898e818308)
Diffstat (limited to 'source4/auth')
-rw-r--r--source4/auth/kerberos/kerberos-notes.txt26
-rw-r--r--source4/auth/kerberos/kerberos_util.c7
2 files changed, 22 insertions, 11 deletions
diff --git a/source4/auth/kerberos/kerberos-notes.txt b/source4/auth/kerberos/kerberos-notes.txt
index 58a4159a7e..43881a20d3 100644
--- a/source4/auth/kerberos/kerberos-notes.txt
+++ b/source4/auth/kerberos/kerberos-notes.txt
@@ -99,6 +99,13 @@ Jean-Baptiste.Marchand@hsc.fr reminds me:
We implement this in hdb-ldb.
+Implicit names for Win2000 Accounts
+-----------------------------------
+
+Despite not having a DNS name, nor a servicePrincipalName on accounts
+created by computers running win2000, it appears we are expected to
+have an implicit mapping from host/computer.full.name and
+host/computer to it's entry.
Returned Salt for PreAuthentication
-----------------------------------
@@ -276,12 +283,8 @@ DCE-RPC service) and when interacting on a kerberos basis, the
password is salted by the client. (That is, no salt infromation
appears to be convayed from the KDC to the member).
-In dealing with this modal, the traditional file keytab seems
-outmoded, because it is not the primary source of the keys, and as
-such we have replaced it with an IN-MEMORY keytab. This avoids Samba4
-needing to deal with system files for it's internal operation. (We
-will however forward-port parts of Samba3's net ads keytab, for the
-benifit of other applications).
+In dealing with this modal, we leverage both the traditional file
+keytab and in-MEMORY keytabs.
When dealing with a windows KDC, the behaviour regarding case
sensitivity and canonacolisation must be accomidated. This means that
@@ -296,9 +299,14 @@ cifs/foo@realm (winxp clients, using netbios)
as well as all case variations on the above.
-Because that all got 'too hard' to put into a real keytab (and because we
-still wanted to supply a keytab to the GSSAPI code), we use in-memory
-keytabs, and specify the target name.
+Because that all got 'too hard' to put into a keytab in the
+traditional way (with the client to specify the name), we either
+pre-compute the keys into a traditional keytab or make an in-MEMORY
+keytab at run time. In both cases we specifiy the principal name to
+GSSAPI, which avoids the need to store duplicate principals.
+
+We use a 'private' keytab in our private dir, referenced from the
+secrets.ldb by default.
Extra Heimdal functions used
----------------------------
diff --git a/source4/auth/kerberos/kerberos_util.c b/source4/auth/kerberos/kerberos_util.c
index d8c650b098..d3edd1b26c 100644
--- a/source4/auth/kerberos/kerberos_util.c
+++ b/source4/auth/kerberos/kerberos_util.c
@@ -89,6 +89,8 @@ krb5_error_code salt_principal_from_credentials(TALLOC_CTX *parent_ctx,
}
if (ret == 0) {
+ /* This song-and-dance effectivly puts the principal
+ * into talloc, so we can't loose it. */
mem_ctx->smb_krb5_context = talloc_reference(mem_ctx, smb_krb5_context);
mem_ctx->principal = *salt_princ;
talloc_set_destructor(mem_ctx, free_principal);
@@ -115,7 +117,8 @@ krb5_error_code principal_from_credentials(TALLOC_CTX *parent_ctx,
princ_string = cli_credentials_get_principal(credentials, mem_ctx);
- /* A NULL here has meaning, as the gssapi server case will then use the principal from the client */
+ /* A NULL here has meaning, as the gssapi server case will
+ * then use the principal from the client */
if (!princ_string) {
talloc_free(mem_ctx);
princ = NULL;
@@ -548,7 +551,7 @@ static krb5_error_code remove_old_entries(TALLOC_CTX *parent_ctx,
* because deletes during enumeration may not
* always be consistant.
*
- * Also, the enumeration locks the keytab
+ * Also, the enumeration locks a FILE: keytab
*/
krb5_kt_end_seq_get(smb_krb5_context->krb5_context, keytab, &cursor);