forked from jengelh/sssd
Jan Engelhardt
a37a1b4320
- Fix dynamic DNS updates not using FQDN (bsc#1160587); Add 0001-AD-use-getaddrinfo-with-AI_CANONNAME-to-find-the-FQD.patch OBS-URL: https://build.opensuse.org/request/show/785694 OBS-URL: https://build.opensuse.org/package/show/network:ldap/sssd?expand=0&rev=231
115 lines
4.2 KiB
Diff
115 lines
4.2 KiB
Diff
From 2143c7276c7603520e2575ef6c9d93a5fc031256 Mon Sep 17 00:00:00 2001
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From: Samuel Cabrero <scabrero@suse.de>
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Date: Mon, 13 Jan 2020 13:52:34 +0100
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Subject: [PATCH] AD: use getaddrinfo with AI_CANONNAME to find the FQDN
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In systems where gethostbyname() does not return the FQDN try calling
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getaddrinfo().
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Signed-off-by: Samuel Cabrero <scabrero@suse.de>
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Reviewed-by: Sumit Bose <sbose@redhat.com>
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---
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src/man/sssd-ad.5.xml | 14 ++++++------
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src/providers/ad/ad_common.c | 42 ++++++++++++++++++++++++++++++++++++
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2 files changed, 50 insertions(+), 6 deletions(-)
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diff --git a/src/man/sssd-ad.5.xml b/src/man/sssd-ad.5.xml
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index c30e5b9db..23e351fc0 100644
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--- a/src/man/sssd-ad.5.xml
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+++ b/src/man/sssd-ad.5.xml
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@@ -193,15 +193,17 @@ ad_enabled_domains = sales.example.com, eng.example.com
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<term>ad_hostname (string)</term>
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<listitem>
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<para>
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- Optional. May be set on machines where the
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- hostname(5) does not reflect the fully qualified
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- name used in the Active Directory domain to
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- identify this host.
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+ Optional. On machines where the hostname(5) does
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+ not reflect the fully qualified name, sssd will try
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+ to expand the short name. If it is not possible or
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+ the short name should be really used instead, set
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+ this parameter explicitly.
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</para>
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<para>
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This field is used to determine the host principal
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- in use in the keytab. It must match the hostname
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- for which the keytab was issued.
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+ in use in the keytab and to perform dynamic DNS
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+ updates. It must match the hostname for which the
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+ keytab was issued.
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</para>
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</listitem>
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</varlistentry>
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diff --git a/src/providers/ad/ad_common.c b/src/providers/ad/ad_common.c
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index 51300f5b2..e5fa83595 100644
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--- a/src/providers/ad/ad_common.c
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+++ b/src/providers/ad/ad_common.c
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@@ -406,6 +406,34 @@ ad_create_1way_trust_options(TALLOC_CTX *mem_ctx,
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return ad_options;
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}
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+static errno_t
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+ad_try_to_get_fqdn(const char *hostname,
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+ char *buf,
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+ size_t buflen)
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+{
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+ int ret;
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+ struct addrinfo *res;
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+ struct addrinfo hints;
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+
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+ memset(&hints, 0, sizeof(struct addrinfo));
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+ hints.ai_socktype = SOCK_DGRAM;
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+ hints.ai_flags = AI_CANONNAME;
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+
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+ ret = getaddrinfo(hostname, NULL, &hints, &res);
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+ if (ret != 0) {
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+ DEBUG(SSSDBG_CRIT_FAILURE,
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+ "getaddrinfo failed: %s\n",
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+ gai_strerror(ret));
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+ return ret;
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+ }
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+
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+ strncpy(buf, res->ai_canonname, buflen);
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+
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+ freeaddrinfo(res);
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+
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+ return EOK;
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+}
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+
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errno_t
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ad_get_common_options(TALLOC_CTX *mem_ctx,
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struct confdb_ctx *cdb,
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@@ -421,6 +449,7 @@ ad_get_common_options(TALLOC_CTX *mem_ctx,
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char *realm;
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char *ad_hostname;
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char hostname[HOST_NAME_MAX + 1];
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+ char fqdn[HOST_NAME_MAX + 1];
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char *case_sensitive_opt;
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const char *opt_override;
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@@ -468,6 +497,19 @@ ad_get_common_options(TALLOC_CTX *mem_ctx,
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goto done;
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}
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hostname[HOST_NAME_MAX] = '\0';
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+
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+ if (strchr(hostname, '.') == NULL) {
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+ ret = ad_try_to_get_fqdn(hostname, fqdn, sizeof(fqdn));
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+ if (ret == EOK) {
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+ DEBUG(SSSDBG_CONF_SETTINGS,
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+ "The hostname [%s] has been expanded to FQDN [%s]. "
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+ "If sssd should really use the short hostname, please "
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+ "set ad_hostname explicitly.\n", hostname, fqdn);
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+ strncpy(hostname, fqdn, sizeof(hostname));
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+ hostname[HOST_NAME_MAX] = '\0';
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+ }
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+ }
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+
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DEBUG(SSSDBG_CONF_SETTINGS,
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"Setting ad_hostname to [%s].\n", hostname);
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ret = dp_opt_set_string(opts->basic, AD_HOSTNAME, hostname);
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--
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2.25.1
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