From ee71c4c0614a504b4472bf64a24fc3c18c6b9987 Mon Sep 17 00:00:00 2001

From: Sumit Bose <sbose@redhat.com>

Date: Thu, 14 Jun 2018 16:49:26 +0200

Subject: [PATCH 22/23] Add add-service-principal and remove-service-principal

 options

Currently it is only possible to specific a service name for service

principals but not to set the full service principal. This is e.g.

needed if there is a service running on a host which should be reachable

by a different DNS name as well.

With this patch service principal can be added and removed by specifying

the full name.

Related to https://bugzilla.redhat.com/show_bug.cgi?id=1547014

---

 doc/adcli.xml      |  21 ++++++++

 library/adenroll.c | 139 +++++++++++++++++++++++++++++++++++++++++++++++++++--

 library/adenroll.h |   8 +++

 library/adldap.c   |  16 ++++--

 tools/computer.c   |  13 +++++

 5 files changed, 189 insertions(+), 8 deletions(-)

diff --git a/doc/adcli.xml b/doc/adcli.xml

index b246190..83b6981 100644

--- a/doc/adcli.xml

+++ b/doc/adcli.xml

@@ -290,6 +290,14 @@ Password for Administrator:

 			not allow that Kerberos tickets can be forwarded to the

 			host.</para></listitem>

 		</varlistentry>

+		<varlistentry>

+			<term><option>--add-service-principal=<parameter>service/hostname</parameter></option></term>

+			<listitem><para>Add a service principal name. In

+			contrast to the <option>--service-name</option> the

+			hostname part can be specified as well in case the

+			service should be accessible with a different host

+			name as well.</para></listitem>

+		</varlistentry>

 		<varlistentry>

 			<term><option>--show-details</option></term>

 			<listitem><para>After a successful join print out information

@@ -416,6 +424,19 @@ $ adcli update --login-ccache=/tmp/krbcc_123

 			not allow that Kerberos tickets can be forwarded to the

 			host.</para></listitem>

 		</varlistentry>

+		<varlistentry>

+			<term><option>--add-service-principal=<parameter>service/hostname</parameter></option></term>

+			<listitem><para>Add a service principal name. In

+			contrast to the <option>--service-name</option> the

+			hostname part can be specified as well in case the

+			service should be accessible with a different host

+			name as well.</para></listitem>

+		</varlistentry>

+		<varlistentry>

+			<term><option>--remove-service-principal=<parameter>service/hostname</parameter></option></term>

+			<listitem><para>Remove a service principal name from

+			the keytab and the AD host object.</para></listitem>

+		</varlistentry>

 		<varlistentry>

 			<term><option>--show-details</option></term>

 			<listitem><para>After a successful join print out information

diff --git a/library/adenroll.c b/library/adenroll.c

index b508caf..c4ba537 100644

--- a/library/adenroll.c

+++ b/library/adenroll.c

@@ -95,6 +95,9 @@ struct _adcli_enroll {

 	char **service_principals;

 	int service_principals_explicit;

+	char **service_principals_to_add;

+	char **service_principals_to_remove;

+

 	char *user_principal;

 	int user_princpal_generate;

@@ -332,6 +335,43 @@ add_service_names_to_service_principals (adcli_enroll *enroll)

 	return ADCLI_SUCCESS;

 }

+static adcli_result

+add_and_remove_service_principals (adcli_enroll *enroll)

+{

+	int length = 0;

+	size_t c;

+	const char **list;

+

+	if (enroll->service_principals != NULL) {

+		length = seq_count (enroll->service_principals);

+	}

+

+	list = adcli_enroll_get_service_principals_to_add (enroll);

+	if (list != NULL) {

+		for (c = 0; list[c] != NULL; c++) {

+			enroll->service_principals = _adcli_strv_add (enroll->service_principals,

+			                                              strdup (list[c]),

+			                                              &length);

+			if (enroll->service_principals == NULL) {

+				return ADCLI_ERR_UNEXPECTED;

+			}

+		}

+	}

+

+	list = adcli_enroll_get_service_principals_to_remove (enroll);

+	if (list != NULL) {

+		for (c = 0; list[c] != NULL; c++) {

+			/* enroll->service_principals typically refects the

+			 * order of the principal in the keytabm so it is not

+			 * ordered. */

+			_adcli_strv_remove_unsorted (enroll->service_principals,

+			                             list[c], &length);

+		}

+	}

+

+	return ADCLI_SUCCESS;

+}

+

 static adcli_result

 ensure_service_principals (adcli_result res,

                            adcli_enroll *enroll)

@@ -343,10 +383,14 @@ ensure_service_principals (adcli_result res,

 	if (!enroll->service_principals) {

 		assert (enroll->service_names != NULL);

-		return add_service_names_to_service_principals (enroll);

+		res = add_service_names_to_service_principals (enroll);

 	}

-	return ADCLI_SUCCESS;

+	if (res == ADCLI_SUCCESS) {

+		res = add_and_remove_service_principals (enroll);

+	}

+

+	return res;

 }

 static adcli_result

@@ -1593,6 +1637,39 @@ free_principal_salts (krb5_context k5,

 	free (salts);

 }

+static adcli_result

+remove_principal_from_keytab (adcli_enroll *enroll,

+                              krb5_context k5,

+                              const char *principal_name)

+{

+	krb5_error_code code;

+	krb5_principal principal;

+	match_principal_kvno closure;

+

+	code = krb5_parse_name (k5, principal_name, &principal);

+	if (code != 0) {

+		_adcli_err ("Couldn't parse principal: %s: %s",

+		            principal_name, krb5_get_error_message (k5, code));

+		return ADCLI_ERR_FAIL;

+	}

+

+	closure.kvno = enroll->kvno;

+	closure.principal = principal;

+	closure.matched = 0;

+

+	code = _adcli_krb5_keytab_clear (k5, enroll->keytab,

+	                                 match_principal_and_kvno, &closure);

+	krb5_free_principal (k5, principal);

+

+	if (code != 0) {

+		_adcli_err ("Couldn't update keytab: %s: %s",

+		            enroll->keytab_name, krb5_get_error_message (k5, code));

+		return ADCLI_ERR_FAIL;

+	}

+

+	return ADCLI_SUCCESS;

+}

+

 static adcli_result

 add_principal_to_keytab (adcli_enroll *enroll,

                          krb5_context k5,

@@ -1702,6 +1779,17 @@ update_keytab_for_principals (adcli_enroll *enroll,

 			return res;

 	}

+	if (enroll->service_principals_to_remove != NULL) {

+		for (i = 0; enroll->service_principals_to_remove[i] != NULL; i++) {

+			res = remove_principal_from_keytab (enroll, k5,

+			                                    enroll->service_principals_to_remove[i]);

+			if (res != ADCLI_SUCCESS) {

+				_adcli_warn ("Failed to remove %s from keytab.",

+				             enroll->service_principals_to_remove[i]);

+			}

+		}

+	}

+

 	return ADCLI_SUCCESS;

 }

@@ -2029,8 +2117,11 @@ adcli_enroll_update (adcli_enroll *enroll,

 	if (_adcli_check_nt_time_string_lifetime (value,

 	                adcli_enroll_get_computer_password_lifetime (enroll))) {

 		/* Do not update keytab if neither new service principals have

-                 * to be added nor the user principal has to be changed. */

-		if (enroll->service_names == NULL && (enroll->user_principal == NULL || enroll->user_princpal_generate)) {

+                 * to be added or deleted nor the user principal has to be changed. */

+		if (enroll->service_names == NULL

+		              && (enroll->user_principal == NULL || enroll->user_princpal_generate)

+		              && enroll->service_principals_to_add == NULL

+		              && enroll->service_principals_to_remove == NULL) {

 			flags |= ADCLI_ENROLL_NO_KEYTAB;

 		}

 		flags |= ADCLI_ENROLL_PASSWORD_VALID;

@@ -2581,3 +2672,43 @@ adcli_enroll_set_trusted_for_delegation (adcli_enroll *enroll,

 	enroll->trusted_for_delegation = value;

 	enroll->trusted_for_delegation_explicit = 1;

 }

+

+const char **

+adcli_enroll_get_service_principals_to_add (adcli_enroll *enroll)

+{

+	return_val_if_fail (enroll != NULL, NULL);

+

+	return (const char **)enroll->service_principals_to_add;

+}

+

+void

+adcli_enroll_add_service_principal_to_add (adcli_enroll *enroll,

+                                           const char *value)

+{

+	return_if_fail (enroll != NULL);

+	return_if_fail (value != NULL);

+

+	enroll->service_principals_to_add = _adcli_strv_add (enroll->service_principals_to_add,

+							    strdup (value), NULL);

+	return_if_fail (enroll->service_principals_to_add != NULL);

+}

+

+const char **

+adcli_enroll_get_service_principals_to_remove (adcli_enroll *enroll)

+{

+	return_val_if_fail (enroll != NULL, NULL);

+

+	return (const char **)enroll->service_principals_to_remove;

+}

+

+void

+adcli_enroll_add_service_principal_to_remove (adcli_enroll *enroll,

+                                              const char *value)

+{

+	return_if_fail (enroll != NULL);

+	return_if_fail (value != NULL);

+

+	enroll->service_principals_to_remove = _adcli_strv_add (enroll->service_principals_to_remove,

+							    strdup (value), NULL);

+	return_if_fail (enroll->service_principals_to_remove != NULL);

+}

diff --git a/library/adenroll.h b/library/adenroll.h

index be2ca18..f87dffa 100644

--- a/library/adenroll.h

+++ b/library/adenroll.h

@@ -98,6 +98,14 @@ const char **      adcli_enroll_get_service_principals  (adcli_enroll *enroll);

 void               adcli_enroll_set_service_principals  (adcli_enroll *enroll,

                                                          const char **value);

+const char **      adcli_enroll_get_service_principals_to_add (adcli_enroll *enroll);

+void               adcli_enroll_add_service_principal_to_add (adcli_enroll *enroll,

+                                                              const char *value);

+

+const char **      adcli_enroll_get_service_principals_to_remove (adcli_enroll *enroll);

+void               adcli_enroll_add_service_principal_to_remove (adcli_enroll *enroll,

+                                                                 const char *value);

+

 const char *       adcli_enroll_get_user_principal      (adcli_enroll *enroll);

 void               adcli_enroll_set_user_principal      (adcli_enroll *enroll,

diff --git a/library/adldap.c b/library/adldap.c

index 07dc373..d93efb7 100644

--- a/library/adldap.c

+++ b/library/adldap.c

@@ -210,16 +210,24 @@ _adcli_ldap_have_in_mod (LDAPMod *mod,

 	struct berval *vals;

 	struct berval **pvals;

 	int count = 0;

+	int count_have = 0;

 	int i;

 	int ret;

-	/* Already in berval format, just compare */

-	if (mod->mod_op & LDAP_MOD_BVALUES)

-		return _adcli_ldap_have_vals (mod->mod_vals.modv_bvals, have);

-

 	/* Count number of values */

 	for (i = 0; mod->mod_vals.modv_strvals[i] != 0; i++)

 		count++;

+	for (i = 0; have[i] != 0; i++)

+		count_have++;

+

+	/* If numbers different something has to be added or removed */

+	if (count != count_have) {

+		return 0;

+	}

+

+	/* Already in berval format, just compare */

+	if (mod->mod_op & LDAP_MOD_BVALUES)

+		return _adcli_ldap_have_vals (mod->mod_vals.modv_bvals, have);

 	vals = malloc (sizeof (struct berval) * (count + 1));

 	pvals = malloc (sizeof (struct berval *) * (count + 1));

diff --git a/tools/computer.c b/tools/computer.c

index b905fd1..377d449 100644

--- a/tools/computer.c

+++ b/tools/computer.c

@@ -110,6 +110,8 @@ typedef enum {

 	opt_add_samba_data,

 	opt_samba_data_tool,

 	opt_trusted_for_delegation,

+	opt_add_service_principal,

+	opt_remove_service_principal,

 } Option;

 static adcli_tool_desc common_usages[] = {

@@ -138,6 +140,8 @@ static adcli_tool_desc common_usages[] = {

 	{ opt_computer_password_lifetime, "lifetime of the host accounts password in days", },

 	{ opt_trusted_for_delegation, "set/unset the TRUSTED_FOR_DELEGATION flag\n"

 	                              "in the userAccountControl attribute", },

+	{ opt_add_service_principal, "add the given service principal to the account\n" },

+	{ opt_remove_service_principal, "remove the given service principal from the account\n" },

 	{ opt_no_password, "don't prompt for or read a password" },

 	{ opt_prompt_password, "prompt for a password if necessary" },

 	{ opt_stdin_password, "read a password from stdin (until EOF) if\n"

@@ -289,6 +293,12 @@ parse_option (Option opt,

 			adcli_enroll_set_trusted_for_delegation (enroll, false);

 		}

 		return;

+	case opt_add_service_principal:

+		adcli_enroll_add_service_principal_to_add (enroll, optarg);

+		return;

+	case opt_remove_service_principal:

+		adcli_enroll_add_service_principal_to_remove (enroll, optarg);

+		return;

 	case opt_verbose:

 		return;

@@ -353,6 +363,7 @@ adcli_tool_computer_join (adcli_conn *conn,

 		{ "os-service-pack", optional_argument, NULL, opt_os_service_pack },

 		{ "user-principal", optional_argument, NULL, opt_user_principal },

 		{ "trusted-for-delegation", required_argument, NULL, opt_trusted_for_delegation },

+		{ "add-service-principal", required_argument, NULL, opt_add_service_principal },

 		{ "show-details", no_argument, NULL, opt_show_details },

 		{ "show-password", no_argument, NULL, opt_show_password },

 		{ "add-samba-data", no_argument, NULL, opt_add_samba_data },

@@ -458,6 +469,8 @@ adcli_tool_computer_update (adcli_conn *conn,

 		{ "user-principal", optional_argument, NULL, opt_user_principal },

 		{ "computer-password-lifetime", optional_argument, NULL, opt_computer_password_lifetime },

 		{ "trusted-for-delegation", required_argument, NULL, opt_trusted_for_delegation },

+		{ "add-service-principal", required_argument, NULL, opt_add_service_principal },

+		{ "remove-service-principal", required_argument, NULL, opt_remove_service_principal },

 		{ "show-details", no_argument, NULL, opt_show_details },

 		{ "show-password", no_argument, NULL, opt_show_password },

 		{ "add-samba-data", no_argument, NULL, opt_add_samba_data },

-- 

2.14.4