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From b2dcfa00dcb7b315a739d35ff6722a25b0ab5556 Mon Sep 17 00:00:00 2001
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From: Lukas Slebodnik <lslebodn@redhat.com>
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Date: Tue, 14 Mar 2017 10:34:00 +0100
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Subject: [PATCH 102/102] UTIL: Use max 15 characters for AD host UPN
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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We do not want to use host principal with AD
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"host/name.domain.tld@DOMAIN.TLD" because it does not work.
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We need to use correct user principal for AD hosts. And we cannot
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rely all fallback "*$" because of other principals in keytab.
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The NetBIOS naming convention allows for 16 characters in a NetBIOS
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name. Microsoft, however, limits NetBIOS names to 15 characters and
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uses the 16th character as a NetBIOS suffix.
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https://support.microsoft.com/en-us/help/163409/netbios-suffixes-16th-character-of-the-netbios-name
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Resolves:
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https://pagure.io/SSSD/sssd/issue/3329
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Reviewed-by: Michal Židek <mzidek@redhat.com>
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(cherry picked from commit c6f1bc32774a7cf2f8678499dfbced420be3a3a1)
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---
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src/util/sss_krb5.c | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/src/util/sss_krb5.c b/src/util/sss_krb5.c
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index d461cf881566af37f31524c16f6a5f1511a5dc89..a3f066e8add5b7d7575c1e0f537c5729e4a0dad0 100644
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--- a/src/util/sss_krb5.c
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+++ b/src/util/sss_krb5.c
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@@ -51,7 +51,13 @@ sss_krb5_get_primary(TALLOC_CTX *mem_ctx,
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*c = toupper(*c);
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}
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- primary = talloc_asprintf(mem_ctx, "%s$", shortname);
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+ /* The samAccountName is recommended to be less than 20 characters.
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+ * This is only for users and groups. For machine accounts,
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+ * the real limit is caused by NetBIOS protocol.
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+ * NetBIOS names are limited to 16 (15 + $)
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+ * https://support.microsoft.com/en-us/help/163409/netbios-suffixes-16th-character-of-the-netbios-name
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+ */
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+ primary = talloc_asprintf(mem_ctx, "%.15s$", shortname);
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talloc_free(shortname);
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return primary;
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}
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--
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2.9.3
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