libwbclient: SSSD implementation

This patch implements the libwbclient API for Samba daemons and
utilities. The main purpose is to map Active Directory users and groups
identified by their SID to POSIX users and groups identified by their
POSIX UIDs and GIDs respectively.

The API is not fully implemented because SSSD does not support some AD
features like WINS or NTLM. Additionally this implementation has its
focus on the file-server use case and hence does not implement some
features which might be needed for a domain controller use case.

Some API calls are generic and independent of the backend like e.g.
converting binary SIDs and GUIDs into a string representation and back
or memory allocation and deallocation. These parts are taken from the
original Samba sources together with copyright and authors. Files
with'_sssd' as part of the name contain the SSSD related calls.

Resolves: https://fedorahosted.org/sssd/ticket/1588

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

1 files changed, 100 insertions, 0 deletions

diff --git a/src/sss_client/libwbclient/wbc_guid.c b/src/sss_client/libwbclient/wbc_guid.c
new file mode 100644
index 000000000..22f772508
--- /dev/null
+++ b/src/sss_client/libwbclient/wbc_guid.c
@@ -0,0 +1,100 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   Winbind client API
+
+   Copyright (C) Gerald (Jerry) Carter 2007
+
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* Required Headers */
+
+#include "libwbclient.h"
+
+/* Convert a binary GUID to a character string */
+wbcErr wbcGuidToString(const struct wbcGuid *guid,
+               char **guid_string)
+{
+    char *result;
+
+    result = (char *)wbcAllocateMemory(37, 1, NULL);
+    if (result == NULL) {
+        return WBC_ERR_NO_MEMORY;
+    }
+    snprintf(result, 37,
+         "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
+         guid->time_low, guid->time_mid,
+         guid->time_hi_and_version,
+         guid->clock_seq[0],
+         guid->clock_seq[1],
+         guid->node[0], guid->node[1],
+         guid->node[2], guid->node[3],
+         guid->node[4], guid->node[5]);
+    *guid_string = result;
+
+    return WBC_ERR_SUCCESS;
+}
+
+/* @brief Convert a character string to a binary GUID */
+wbcErr wbcStringToGuid(const char *str,
+               struct wbcGuid *guid)
+{
+    uint32_t time_low;
+    uint32_t time_mid, time_hi_and_version;
+    uint32_t clock_seq[2];
+    uint32_t node[6];
+    int i;
+    wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
+
+    if (!guid) {
+        wbc_status = WBC_ERR_INVALID_PARAM;
+        BAIL_ON_WBC_ERROR(wbc_status);
+    }
+
+    if (!str) {
+        wbc_status = WBC_ERR_INVALID_PARAM;
+        BAIL_ON_WBC_ERROR(wbc_status);
+    }
+
+    if (11 == sscanf(str, "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
+             &time_low, &time_mid, &time_hi_and_version,
+             &clock_seq[0], &clock_seq[1],
+             &node[0], &node[1], &node[2], &node[3], &node[4], &node[5])) {
+            wbc_status = WBC_ERR_SUCCESS;
+    } else if (11 == sscanf(str, "{%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}",
+                &time_low, &time_mid, &time_hi_and_version,
+                &clock_seq[0], &clock_seq[1],
+                &node[0], &node[1], &node[2], &node[3], &node[4], &node[5])) {
+            wbc_status = WBC_ERR_SUCCESS;
+    }
+
+    BAIL_ON_WBC_ERROR(wbc_status);
+
+    guid->time_low = time_low;
+    guid->time_mid = time_mid;
+    guid->time_hi_and_version = time_hi_and_version;
+    guid->clock_seq[0] = clock_seq[0];
+    guid->clock_seq[1] = clock_seq[1];
+
+    for (i=0;i<6;i++) {
+        guid->node[i] = node[i];
+    }
+
+    wbc_status = WBC_ERR_SUCCESS;
+
+done:
+    return wbc_status;
+}