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From 54c3d176326f719ffefded17bb797bc9e6c7f3c0 Mon Sep 17 00:00:00 2001
From: Sumit Bose <sbose@redhat.com>
Date: Mon, 4 Jun 2018 10:49:33 +0200
Subject: [PATCH 18/23] update: allow to add service names
Related to https://bugzilla.redhat.com/show_bug.cgi?id=1547013
https://bugzilla.redhat.com/show_bug.cgi?id=1545568
---
library/adenroll.c | 136 +++++++++++++++++++++++++++++++++-------------------
library/adkrb5.c | 113 +++++++++++++++++++++++++++++++++++++++++++
library/adprivate.h | 6 +++
3 files changed, 206 insertions(+), 49 deletions(-)
diff --git a/library/adenroll.c b/library/adenroll.c
index ee845ef..6fdc773 100644
--- a/library/adenroll.c
+++ b/library/adenroll.c
@@ -305,13 +305,37 @@ ensure_service_names (adcli_result res,
}
static adcli_result
-ensure_service_principals (adcli_result res,
- adcli_enroll *enroll)
+add_service_names_to_service_principals (adcli_enroll *enroll)
{
char *name;
int length = 0;
int i;
+ if (enroll->service_principals != NULL) {
+ length = seq_count (enroll->service_principals);
+ }
+
+ for (i = 0; enroll->service_names[i] != NULL; i++) {
+ if (asprintf (&name, "%s/%s", enroll->service_names[i], enroll->computer_name) < 0)
+ return_unexpected_if_reached ();
+ enroll->service_principals = _adcli_strv_add (enroll->service_principals,
+ name, &length);
+
+ if (enroll->host_fqdn) {
+ if (asprintf (&name, "%s/%s", enroll->service_names[i], enroll->host_fqdn) < 0)
+ return_unexpected_if_reached ();
+ enroll->service_principals = _adcli_strv_add (enroll->service_principals,
+ name, &length);
+ }
+ }
+
+ return ADCLI_SUCCESS;
+}
+
+static adcli_result
+ensure_service_principals (adcli_result res,
+ adcli_enroll *enroll)
+{
if (res != ADCLI_SUCCESS)
return res;
@@ -319,20 +343,7 @@ ensure_service_principals (adcli_result res,
if (!enroll->service_principals) {
assert (enroll->service_names != NULL);
-
- for (i = 0; enroll->service_names[i] != NULL; i++) {
- if (asprintf (&name, "%s/%s", enroll->service_names[i], enroll->computer_name) < 0)
- return_unexpected_if_reached ();
- enroll->service_principals = _adcli_strv_add (enroll->service_principals,
- name, &length);
-
- if (enroll->host_fqdn) {
- if (asprintf (&name, "%s/%s", enroll->service_names[i], enroll->host_fqdn) < 0)
- return_unexpected_if_reached ();
- enroll->service_principals = _adcli_strv_add (enroll->service_principals,
- name, &length);
- }
- }
+ return add_service_names_to_service_principals (enroll);
}
return ADCLI_SUCCESS;
@@ -356,6 +367,7 @@ ensure_keytab_principals (adcli_result res,
return_unexpected_if_fail (k5 != NULL);
enroll->keytab_principals = calloc (count + 3, sizeof (krb5_principal));
+ return_unexpected_if_fail (enroll->keytab_principals != NULL);
at = 0;
/* First add the principal for the computer account name */
@@ -1266,7 +1278,7 @@ update_computer_account (adcli_enroll *enroll)
}
}
- if (res == ADCLI_SUCCESS && !enroll->user_princpal_generate) {
+ if (res == ADCLI_SUCCESS && enroll->user_principal != NULL && !enroll->user_princpal_generate) {
char *vals_userPrincipalName[] = { enroll->user_principal, NULL };
LDAPMod userPrincipalName = { LDAP_MOD_REPLACE, "userPrincipalName", { vals_userPrincipalName, }, };
LDAPMod *mods[] = { &userPrincipalName, NULL, };
@@ -1519,7 +1531,8 @@ add_principal_to_keytab (adcli_enroll *enroll,
krb5_context k5,
krb5_principal principal,
const char *principal_name,
- int *which_salt)
+ int *which_salt,
+ adcli_enroll_flags flags)
{
match_principal_kvno closure;
krb5_data password;
@@ -1547,41 +1560,47 @@ add_principal_to_keytab (adcli_enroll *enroll,
enroll->keytab_name);
}
- password.data = enroll->computer_password;
- password.length = strlen (enroll->computer_password);
-
enctypes = adcli_enroll_get_keytab_enctypes (enroll);
- /*
- * So we need to discover which salt to use. As a side effect we are
- * also testing that our account works.
- */
+ if (flags & ADCLI_ENROLL_PASSWORD_VALID) {
+ code = _adcli_krb5_keytab_copy_entries (k5, enroll->keytab, principal,
+ enroll->kvno, enctypes);
+ } else {
- salts = build_principal_salts (enroll, k5, principal);
- return_unexpected_if_fail (salts != NULL);
+ password.data = enroll->computer_password;
+ password.length = strlen (enroll->computer_password);
- if (*which_salt < 0) {
- code = _adcli_krb5_keytab_discover_salt (k5, principal, enroll->kvno, &password,
- enctypes, salts, which_salt);
- if (code != 0) {
- _adcli_warn ("Couldn't authenticate with keytab while discovering which salt to use: %s: %s",
- principal_name, krb5_get_error_message (k5, code));
- *which_salt = DEFAULT_SALT;
- } else {
- assert (*which_salt >= 0);
- _adcli_info ("Discovered which keytab salt to use");
+ /*
+ * So we need to discover which salt to use. As a side effect we are
+ * also testing that our account works.
+ */
+
+ salts = build_principal_salts (enroll, k5, principal);
+ return_unexpected_if_fail (salts != NULL);
+
+ if (*which_salt < 0) {
+ code = _adcli_krb5_keytab_discover_salt (k5, principal, enroll->kvno, &password,
+ enctypes, salts, which_salt);
+ if (code != 0) {
+ _adcli_warn ("Couldn't authenticate with keytab while discovering which salt to use: %s: %s",
+ principal_name, krb5_get_error_message (k5, code));
+ *which_salt = DEFAULT_SALT;
+ } else {
+ assert (*which_salt >= 0);
+ _adcli_info ("Discovered which keytab salt to use");
+ }
}
- }
- code = _adcli_krb5_keytab_add_entries (k5, enroll->keytab, principal,
- enroll->kvno, &password, enctypes, &salts[*which_salt]);
+ code = _adcli_krb5_keytab_add_entries (k5, enroll->keytab, principal,
+ enroll->kvno, &password, enctypes, &salts[*which_salt]);
- free_principal_salts (k5, salts);
+ free_principal_salts (k5, salts);
- if (code != 0) {
- _adcli_err ("Couldn't add keytab entries: %s: %s",
- enroll->keytab_name, krb5_get_error_message (k5, code));
- return ADCLI_ERR_FAIL;
+ if (code != 0) {
+ _adcli_err ("Couldn't add keytab entries: %s: %s",
+ enroll->keytab_name, krb5_get_error_message (k5, code));
+ return ADCLI_ERR_FAIL;
+ }
}
@@ -1591,7 +1610,8 @@ add_principal_to_keytab (adcli_enroll *enroll,
}
static adcli_result
-update_keytab_for_principals (adcli_enroll *enroll)
+update_keytab_for_principals (adcli_enroll *enroll,
+ adcli_enroll_flags flags)
{
krb5_context k5;
adcli_result res;
@@ -1608,7 +1628,7 @@ update_keytab_for_principals (adcli_enroll *enroll)
if (krb5_unparse_name (k5, enroll->keytab_principals[i], &name) != 0)
name = "";
res = add_principal_to_keytab (enroll, k5, enroll->keytab_principals[i],
- name, &which_salt);
+ name, &which_salt, flags);
krb5_free_unparsed_name (k5, name);
if (res != ADCLI_SUCCESS)
@@ -1807,6 +1827,20 @@ enroll_join_or_update_tasks (adcli_enroll *enroll,
/* We ignore failures of setting these fields */
update_and_calculate_enctypes (enroll);
update_computer_account (enroll);
+
+ /* service_names is only set from input on the command line, so no
+ * additional check for explicit is needed here */
+ if (enroll->service_names != NULL) {
+ res = add_service_names_to_service_principals (enroll);
+ if (res != ADCLI_SUCCESS) {
+ return res;
+ }
+ res = ensure_keytab_principals (res, enroll);
+ if (res != ADCLI_SUCCESS) {
+ return res;
+ }
+ }
+
update_service_principals (enroll);
if ( (flags & ADCLI_ENROLL_ADD_SAMBA_DATA) && ! (flags & ADCLI_ENROLL_PASSWORD_VALID)) {
@@ -1826,7 +1860,7 @@ enroll_join_or_update_tasks (adcli_enroll *enroll,
* that we use for salting.
*/
- return update_keytab_for_principals (enroll);
+ return update_keytab_for_principals (enroll, flags);
}
adcli_result
@@ -1927,7 +1961,11 @@ adcli_enroll_update (adcli_enroll *enroll,
if (_adcli_check_nt_time_string_lifetime (value,
adcli_enroll_get_computer_password_lifetime (enroll))) {
- flags |= ADCLI_ENROLL_NO_KEYTAB;
+ /* 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)) {
+ flags |= ADCLI_ENROLL_NO_KEYTAB;
+ }
flags |= ADCLI_ENROLL_PASSWORD_VALID;
}
free (value);
diff --git a/library/adkrb5.c b/library/adkrb5.c
index b0e903e..033c181 100644
--- a/library/adkrb5.c
+++ b/library/adkrb5.c
@@ -204,6 +204,119 @@ _adcli_krb5_open_keytab (krb5_context k5,
return ADCLI_SUCCESS;
}
+typedef struct {
+ krb5_kvno kvno;
+ krb5_enctype enctype;
+ int matched;
+} match_enctype_kvno;
+
+static krb5_boolean
+match_enctype_and_kvno (krb5_context k5,
+ krb5_keytab_entry *entry,
+ void *data)
+{
+ krb5_boolean similar = FALSE;
+ match_enctype_kvno *closure = data;
+ krb5_error_code code;
+
+ assert (closure->enctype);
+
+ code = krb5_c_enctype_compare (k5, closure->enctype, entry->key.enctype,
+ &similar);
+
+ if (code == 0 && entry->vno == closure->kvno && similar) {
+ closure->matched = 1;
+ return 1;
+ }
+
+ return 0;
+}
+
+static krb5_error_code
+_adcli_krb5_get_keyblock (krb5_context k5,
+ krb5_keytab keytab,
+ krb5_keyblock *keyblock,
+ krb5_boolean (* match_func) (krb5_context,
+ krb5_keytab_entry *,
+ void *),
+ void *match_data)
+{
+ krb5_kt_cursor cursor;
+ krb5_keytab_entry entry;
+ krb5_error_code code;
+
+ code = krb5_kt_start_seq_get (k5, keytab, &cursor);
+ if (code == KRB5_KT_END || code == ENOENT)
+ return 0;
+ else if (code != 0)
+ return code;
+
+ for (;;) {
+ code = krb5_kt_next_entry (k5, keytab, &entry, &cursor);
+ if (code != 0)
+ break;
+
+ /* See if we should remove this entry */
+ if (!match_func (k5, &entry, match_data)) {
+ krb5_free_keytab_entry_contents (k5, &entry);
+ continue;
+ }
+
+ code = krb5_copy_keyblock_contents (k5, &entry.key, keyblock);
+ krb5_free_keytab_entry_contents (k5, &entry);
+ break;
+
+
+ }
+
+ if (code == KRB5_KT_END)
+ code = 0;
+
+ krb5_kt_end_seq_get (k5, keytab, &cursor);
+ return code;
+}
+
+krb5_error_code
+_adcli_krb5_keytab_copy_entries (krb5_context k5,
+ krb5_keytab keytab,
+ krb5_principal principal,
+ krb5_kvno kvno,
+ krb5_enctype *enctypes)
+{
+ krb5_keytab_entry entry;
+ krb5_error_code code;
+ int i;
+ match_enctype_kvno closure;
+
+ for (i = 0; enctypes[i] != 0; i++) {
+
+ closure.kvno = kvno;
+ closure.enctype = enctypes[i];
+ closure.matched = 0;
+
+ memset (&entry, 0, sizeof (entry));
+
+ code = _adcli_krb5_get_keyblock (k5, keytab, &entry.key,
+ match_enctype_and_kvno, &closure);
+ if (code != 0) {
+ return code;
+ }
+
+
+ entry.principal = principal;
+ entry.vno = kvno;
+
+ code = krb5_kt_add_entry (k5, keytab, &entry);
+
+ entry.principal = NULL;
+ krb5_free_keytab_entry_contents (k5, &entry);
+
+ if (code != 0)
+ return code;
+ }
+
+ return 0;
+}
krb5_error_code
_adcli_krb5_keytab_add_entries (krb5_context k5,
diff --git a/library/adprivate.h b/library/adprivate.h
index 83a88f6..7485249 100644
--- a/library/adprivate.h
+++ b/library/adprivate.h
@@ -282,6 +282,12 @@ krb5_enctype * _adcli_krb5_parse_enctypes (const char *value);
char * _adcli_krb5_format_enctypes (krb5_enctype *enctypes);
+krb5_error_code _adcli_krb5_keytab_copy_entries (krb5_context k5,
+ krb5_keytab keytab,
+ krb5_principal principal,
+ krb5_kvno kvno,
+ krb5_enctype *enctypes);
+
struct _adcli_attrs {
LDAPMod **mods;
int len;
--
2.14.4
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