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From 85b835f8258a57e3b23de47a255dddd822d5bfb3 Mon Sep 17 00:00:00 2001
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From: Sumit Bose <sbose@redhat.com>
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Date: Fri, 15 Mar 2019 17:33:44 +0100
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Subject: [PATCH] library: use getaddrinfo with AI_CANONNAME to find a FQDN
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Currently adcli creates service principals only with a short name if the
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hostname of the client is a short name. This would fail is
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Kerberos/GSSAPI clients will use the fully-qualified domain name (FQDN)
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to access the host.
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With this patch adcli tries to expand the short name by calling
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getaddrinfo with the AI_CANONNAME hint.
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Related to https://gitlab.freedesktop.org/realmd/adcli/issues/1
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---
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doc/adcli.xml | 6 +++++-
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library/adconn.c | 30 +++++++++++++++++++++++++++++-
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2 files changed, 34 insertions(+), 2 deletions(-)
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diff --git a/doc/adcli.xml b/doc/adcli.xml
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index 97dec08..4722c3a 100644
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--- a/doc/adcli.xml
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+++ b/doc/adcli.xml
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@@ -228,7 +228,11 @@ Password for Administrator:
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<term><option>-H, --host-fqdn=<parameter>host</parameter></option></term>
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<listitem><para>Override the local machine's fully qualified
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domain name. If not specified, the local machine's hostname
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- will be retrieved via <function>gethostname()</function>.</para></listitem>
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+ will be retrieved via <function>gethostname()</function>.
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+ If <function>gethostname()</function> only returns a short name
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+ <function>getaddrinfo()</function> with the AI_CANONNAME hint
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+ is called to expand the name to a fully qualified domain
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+ name.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-K, --host-keytab=<parameter>/path/to/keytab</parameter></option></term>
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diff --git a/library/adconn.c b/library/adconn.c
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index e2250e3..f6c23d3 100644
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--- a/library/adconn.c
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+++ b/library/adconn.c
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@@ -86,11 +86,36 @@ struct _adcli_conn_ctx {
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krb5_keytab keytab;
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};
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+static char *try_to_get_fqdn (const char *host_name)
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+{
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+ int ret;
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+ char *fqdn = NULL;
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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 (host_name, NULL, &hints, &res;;
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+ if (ret != 0) {
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+ _adcli_err ("Failed to find FQDN: %s", gai_strerror (ret));
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+ return NULL;
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+ }
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+
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+ fqdn = strdup (res->ai_canonname);
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+
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+ freeaddrinfo (res);
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+
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+ return fqdn;
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+}
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+
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static adcli_result
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ensure_host_fqdn (adcli_result res,
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adcli_conn *conn)
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{
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char hostname[HOST_NAME_MAX + 1];
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+ char *fqdn = NULL;
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int ret;
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if (res != ADCLI_SUCCESS)
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@@ -107,7 +132,10 @@ ensure_host_fqdn (adcli_result res,
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return ADCLI_ERR_UNEXPECTED;
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}
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- conn->host_fqdn = strdup (hostname);
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+ if (strchr (hostname, '.') == NULL) {
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+ fqdn = try_to_get_fqdn (hostname);
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+ }
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+ conn->host_fqdn = fqdn != NULL ? fqdn : strdup (hostname);
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return_unexpected_if_fail (conn->host_fqdn != NULL);
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return ADCLI_SUCCESS;
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}
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--
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2.20.1
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