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idmap: Handle gid->SID mapping

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This commit is contained in:
Kai Blin 2008-02-18 14:30:17 +01:00
parent 6ac6de8476
commit 6f2d95030c
2 changed files with 163 additions and 7 deletions
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157
source/winbind/idmap.c
View File

@ -354,8 +354,6 @@ failed:
/**
* Map a Unix gid to the corresponding SID
*
* \todo Create a SID from the S-1-22-2 range for unmapped groups
*
* \param idmap_ctx idmap context to use
* \param mem_ctx talloc context the memory for the struct dom_sid is allocated
* from.
@ -368,7 +366,160 @@ failed:
NTSTATUS idmap_gid_to_sid(struct idmap_context *idmap_ctx, TALLOC_CTX *mem_ctx,
const gid_t gid, struct dom_sid **sid)
{
return NT_STATUS_NONE_MAPPED;
int ret;
NTSTATUS status = NT_STATUS_NONE_MAPPED;
struct ldb_context *ldb = idmap_ctx->ldb_ctx;
struct ldb_message *msg;
struct ldb_result *res = NULL;
int trans = -1;
gid_t low, high;
char *sid_string, *gid_string;
struct dom_sid *unix_groups_sid, *new_sid;
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
ret = ldb_search_exp_fmt(ldb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
NULL, "(&(objectClass=sidMap)(gidNumber=%u))", gid);
if (ret != LDB_SUCCESS) {
DEBUG(1, ("Search failed: %s\n", ldb_errstring(ldb)));
status = NT_STATUS_NONE_MAPPED;
goto failed;
}
if (res->count == 1) {
*sid = idmap_msg_get_dom_sid(mem_ctx, res->msgs[0],
"objectSid");
if (*sid == NULL) {
DEBUG(1, ("Failed to get sid from db: %u\n", ret));
status = NT_STATUS_NONE_MAPPED;
goto failed;
}
/* No change, so cancel the transaction */
ldb_transaction_cancel(ldb);
talloc_free(tmp_ctx);
return NT_STATUS_OK;
}
DEBUG(6, ("gid not found in idmap db, trying to allocate SID.\n"));
trans = ldb_transaction_start(ldb);
if (trans != LDB_SUCCESS) {
status = NT_STATUS_NONE_MAPPED;
goto failed;
}
/* Now redo the search to make sure noone added a mapping for that SID
* while we weren't looking.*/
ret = ldb_search_exp_fmt(ldb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
NULL, "(&(objectClass=sidMap)(gidNumber=%u))",
gid);
if (ret != LDB_SUCCESS) {
DEBUG(1, ("Search failed: %s\n", ldb_errstring(ldb)));
status = NT_STATUS_NONE_MAPPED;
goto failed;
}
if (res->count > 0) {
DEBUG(1, ("sidMap modified while trying to add a mapping.\n"));
status = NT_STATUS_RETRY;
goto failed;
}
ret = idmap_get_bounds(idmap_ctx, &low, &high);
if (ret != LDB_SUCCESS) {
DEBUG(1, ("Failed to get id bounds from db: %u\n", ret));
status = NT_STATUS_NONE_MAPPED;
goto failed;
}
if (gid >= low && gid <= high) {
/* An existing group would have been mapped before */
status = NT_STATUS_NO_SUCH_USER;
goto failed;
}
/* For local groups, we just create a rid = gid +1, so root doesn't end
* up with a 0 rid */
unix_groups_sid = dom_sid_parse_talloc(tmp_ctx, "S-1-22-2");
if (unix_groups_sid == NULL) {
status = NT_STATUS_NO_MEMORY;
goto failed;
}
new_sid = dom_sid_add_rid(mem_ctx, unix_groups_sid, gid + 1);
if (new_sid == NULL) {
status = NT_STATUS_NO_MEMORY;
goto failed;
}
sid_string = dom_sid_string(tmp_ctx, new_sid);
if (sid_string == NULL) {
status = NT_STATUS_NO_MEMORY;
goto failed;
}
gid_string = talloc_asprintf(tmp_ctx, "%u", gid);
if (gid_string == NULL) {
status = NT_STATUS_NO_MEMORY;
goto failed;
}
msg = ldb_msg_new(tmp_ctx);
if (msg == NULL) {
status = NT_STATUS_NO_MEMORY;
goto failed;
}
msg->dn = ldb_dn_new_fmt(tmp_ctx, ldb, "CN=%s", sid_string);
if (msg->dn == NULL) {
status = NT_STATUS_NO_MEMORY;
goto failed;
}
ret = ldb_msg_add_string(msg, "gidNumber", gid_string);
if (ret != LDB_SUCCESS) {
status = NT_STATUS_NONE_MAPPED;
goto failed;
}
ret = idmap_msg_add_dom_sid(idmap_ctx, tmp_ctx, msg, "objectSid",
new_sid);
if (ret != LDB_SUCCESS) {
status = NT_STATUS_NONE_MAPPED;
goto failed;
}
ret = ldb_msg_add_string(msg, "objectClass", "sidMap");
if (ret != LDB_SUCCESS) {
status = NT_STATUS_NONE_MAPPED;
goto failed;
}
ret = ldb_msg_add_string(msg, "cn", sid_string);
if (ret != LDB_SUCCESS) {
status = NT_STATUS_NONE_MAPPED;
goto failed;
}
ret = ldb_add(ldb, msg);
if (ret != LDB_SUCCESS) {
status = NT_STATUS_NONE_MAPPED;
goto failed;
}
trans = ldb_transaction_commit(ldb);
if (trans != LDB_SUCCESS) {
status = NT_STATUS_NONE_MAPPED;
goto failed;
}
*sid = new_sid;
talloc_free(tmp_ctx);
return NT_STATUS_OK;
failed:
if (trans == LDB_SUCCESS) ldb_transaction_cancel(ldb);
talloc_free(tmp_ctx);
return status;
}
/**

13
source/winbind/wb_gid2sid.c
View File

@ -25,6 +25,7 @@
#include "smbd/service_task.h"
#include "winbind/wb_helper.h"
#include "libcli/security/proto.h"
#include "winbind/idmap.h"
struct gid2sid_state {
struct composite_context *ctx;
@ -50,10 +51,14 @@ struct composite_context *wb_gid2sid_send(TALLOC_CTX *mem_ctx,
result->private_data = state;
state->service = service;
/* FIXME: This is a stub so far.
* We cheat by just using the gid as RID with the domain SID.*/
state->sid = dom_sid_add_rid(result, service->primary_sid, gid);
if (composite_nomem(state->sid, state->ctx)) return result;
state->ctx->status = idmap_gid_to_sid(service->idmap_ctx, mem_ctx, gid,
&state->sid);
if (NT_STATUS_EQUAL(state->ctx->status, NT_STATUS_RETRY)) {
state->ctx->status = idmap_gid_to_sid(service->idmap_ctx,
mem_ctx, gid,
&state->sid);
}
if (!composite_is_ok(state->ctx)) return result;
composite_done(state->ctx);
return result;