adcli/SOURCES/0001-library-use-getaddrinfo-with-AI_CANONNAME-to-find-a-.patch

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2020-07-14 01:03:58 +00:00
From 85b835f8258a57e3b23de47a255dddd822d5bfb3 Mon Sep 17 00:00:00 2001
From: Sumit Bose <sbose@redhat.com>
Date: Fri, 15 Mar 2019 17:33:44 +0100
Subject: [PATCH] library: use getaddrinfo with AI_CANONNAME to find a FQDN
Currently adcli creates service principals only with a short name if the
hostname of the client is a short name. This would fail is
Kerberos/GSSAPI clients will use the fully-qualified domain name (FQDN)
to access the host.
With this patch adcli tries to expand the short name by calling
getaddrinfo with the AI_CANONNAME hint.
Related to https://gitlab.freedesktop.org/realmd/adcli/issues/1
---
doc/adcli.xml | 6 +++++-
library/adconn.c | 30 +++++++++++++++++++++++++++++-
2 files changed, 34 insertions(+), 2 deletions(-)
diff --git a/doc/adcli.xml b/doc/adcli.xml
index 97dec08..4722c3a 100644
--- a/doc/adcli.xml
+++ b/doc/adcli.xml
@@ -228,7 +228,11 @@ Password for Administrator:
<term><option>-H, --host-fqdn=<parameter>host</parameter></option></term>
<listitem><para>Override the local machine's fully qualified
domain name. If not specified, the local machine's hostname
- will be retrieved via <function>gethostname()</function>.</para></listitem>
+ will be retrieved via <function>gethostname()</function>.
+ If <function>gethostname()</function> only returns a short name
+ <function>getaddrinfo()</function> with the AI_CANONNAME hint
+ is called to expand the name to a fully qualified domain
+ name.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-K, --host-keytab=<parameter>/path/to/keytab</parameter></option></term>
diff --git a/library/adconn.c b/library/adconn.c
index e2250e3..f6c23d3 100644
--- a/library/adconn.c
+++ b/library/adconn.c
@@ -86,11 +86,36 @@ struct _adcli_conn_ctx {
krb5_keytab keytab;
};
+static char *try_to_get_fqdn (const char *host_name)
+{
+ int ret;
+ char *fqdn = NULL;
+ struct addrinfo *res;
+ struct addrinfo hints;
+
+ memset (&hints, 0, sizeof (struct addrinfo));
+ hints.ai_socktype = SOCK_DGRAM;
+ hints.ai_flags = AI_CANONNAME;
+
+ ret = getaddrinfo (host_name, NULL, &hints, &res);
+ if (ret != 0) {
+ _adcli_err ("Failed to find FQDN: %s", gai_strerror (ret));
+ return NULL;
+ }
+
+ fqdn = strdup (res->ai_canonname);
+
+ freeaddrinfo (res);
+
+ return fqdn;
+}
+
static adcli_result
ensure_host_fqdn (adcli_result res,
adcli_conn *conn)
{
char hostname[HOST_NAME_MAX + 1];
+ char *fqdn = NULL;
int ret;
if (res != ADCLI_SUCCESS)
@@ -107,7 +132,10 @@ ensure_host_fqdn (adcli_result res,
return ADCLI_ERR_UNEXPECTED;
}
- conn->host_fqdn = strdup (hostname);
+ if (strchr (hostname, '.') == NULL) {
+ fqdn = try_to_get_fqdn (hostname);
+ }
+ conn->host_fqdn = fqdn != NULL ? fqdn : strdup (hostname);
return_unexpected_if_fail (conn->host_fqdn != NULL);
return ADCLI_SUCCESS;
}
--
2.20.1