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-rw-r--r--source3/smbd/uid.c709
1 files changed, 709 insertions, 0 deletions
diff --git a/source3/smbd/uid.c b/source3/smbd/uid.c
new file mode 100644
index 0000000000..864d3d6c66
--- /dev/null
+++ b/source3/smbd/uid.c
@@ -0,0 +1,709 @@
+/*
+ Unix SMB/CIFS implementation.
+ uid/user handling
+ Copyright (C) Andrew Tridgell 1992-1998
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+/* what user is current? */
+extern struct current_user current_user;
+
+/****************************************************************************
+ Become the guest user without changing the security context stack.
+****************************************************************************/
+
+BOOL change_to_guest(void)
+{
+ static struct passwd *pass=NULL;
+
+ if (!pass) {
+ /* Don't need to free() this as its stored in a static */
+ pass = getpwnam_alloc(lp_guestaccount());
+ if (!pass)
+ return(False);
+ }
+
+#ifdef AIX
+ /* MWW: From AIX FAQ patch to WU-ftpd: call initgroups before
+ setting IDs */
+ initgroups(pass->pw_name, pass->pw_gid);
+#endif
+
+ set_sec_ctx(pass->pw_uid, pass->pw_gid, 0, NULL, NULL);
+
+ current_user.conn = NULL;
+ current_user.vuid = UID_FIELD_INVALID;
+
+ return True;
+}
+
+/*******************************************************************
+ Check if a username is OK.
+********************************************************************/
+
+static BOOL check_user_ok(connection_struct *conn, user_struct *vuser,int snum)
+{
+ int i;
+ for (i=0;i<conn->uid_cache.entries;i++)
+ if (conn->uid_cache.list[i] == vuser->uid)
+ return(True);
+
+ if (!user_ok(vuser->user.unix_name,snum))
+ return(False);
+
+ i = conn->uid_cache.entries % UID_CACHE_SIZE;
+ conn->uid_cache.list[i] = vuser->uid;
+
+ if (conn->uid_cache.entries < UID_CACHE_SIZE)
+ conn->uid_cache.entries++;
+
+ return(True);
+}
+
+/****************************************************************************
+ Become the user of a connection number without changing the security context
+ stack, but modify the currnet_user entries.
+****************************************************************************/
+
+BOOL change_to_user(connection_struct *conn, uint16 vuid)
+{
+ user_struct *vuser = get_valid_user_struct(vuid);
+ int snum;
+ gid_t gid;
+ uid_t uid;
+ char group_c;
+ BOOL must_free_token = False;
+ NT_USER_TOKEN *token = NULL;
+
+ if (!conn) {
+ DEBUG(2,("change_to_user: Connection not open\n"));
+ return(False);
+ }
+
+ /*
+ * We need a separate check in security=share mode due to vuid
+ * always being UID_FIELD_INVALID. If we don't do this then
+ * in share mode security we are *always* changing uid's between
+ * SMB's - this hurts performance - Badly.
+ */
+
+ if((lp_security() == SEC_SHARE) && (current_user.conn == conn) &&
+ (current_user.uid == conn->uid)) {
+ DEBUG(4,("change_to_user: Skipping user change - already user\n"));
+ return(True);
+ } else if ((current_user.conn == conn) &&
+ (vuser != 0) && (current_user.vuid == vuid) &&
+ (current_user.uid == vuser->uid)) {
+ DEBUG(4,("change_to_user: Skipping user change - already user\n"));
+ return(True);
+ }
+
+ snum = SNUM(conn);
+
+ if((vuser != NULL) && !check_user_ok(conn, vuser, snum))
+ return False;
+
+ if (conn->force_user ||
+ conn->admin_user ||
+ (lp_security() == SEC_SHARE)) {
+ uid = conn->uid;
+ gid = conn->gid;
+ current_user.groups = conn->groups;
+ current_user.ngroups = conn->ngroups;
+ token = conn->nt_user_token;
+ } else {
+ if (!vuser) {
+ DEBUG(2,("change_to_user: Invalid vuid used %d\n",vuid));
+ return(False);
+ }
+ uid = vuser->uid;
+ gid = vuser->gid;
+ current_user.ngroups = vuser->n_groups;
+ current_user.groups = vuser->groups;
+ token = vuser->nt_user_token;
+ }
+
+ /*
+ * See if we should force group for this service.
+ * If so this overrides any group set in the force
+ * user code.
+ */
+
+ if((group_c = *lp_force_group(snum))) {
+ BOOL is_guest = False;
+
+ if(group_c == '+') {
+
+ /*
+ * Only force group if the user is a member of
+ * the service group. Check the group memberships for
+ * this user (we already have this) to
+ * see if we should force the group.
+ */
+
+ int i;
+ for (i = 0; i < current_user.ngroups; i++) {
+ if (current_user.groups[i] == conn->gid) {
+ gid = conn->gid;
+ break;
+ }
+ }
+ } else {
+ gid = conn->gid;
+ }
+
+ /*
+ * We've changed the group list in the token - we must
+ * re-create it.
+ */
+
+ if (vuser && vuser->guest)
+ is_guest = True;
+
+ token = create_nt_token(uid, gid, current_user.ngroups, current_user.groups, is_guest, NULL);
+ must_free_token = True;
+ }
+
+ set_sec_ctx(uid, gid, current_user.ngroups, current_user.groups, token);
+
+ /*
+ * Free the new token (as set_sec_ctx copies it).
+ */
+
+ if (must_free_token)
+ delete_nt_token(&token);
+
+ current_user.conn = conn;
+ current_user.vuid = vuid;
+
+ DEBUG(5,("change_to_user uid=(%d,%d) gid=(%d,%d)\n",
+ (int)getuid(),(int)geteuid(),(int)getgid(),(int)getegid()));
+
+ return(True);
+}
+
+/****************************************************************************
+ Go back to being root without changing the security context stack,
+ but modify the current_user entries.
+****************************************************************************/
+
+BOOL change_to_root_user(void)
+{
+ set_root_sec_ctx();
+
+ DEBUG(5,("change_to_root_user: now uid=(%d,%d) gid=(%d,%d)\n",
+ (int)getuid(),(int)geteuid(),(int)getgid(),(int)getegid()));
+
+ current_user.conn = NULL;
+ current_user.vuid = UID_FIELD_INVALID;
+
+ return(True);
+}
+
+/****************************************************************************
+ Become the user of an authenticated connected named pipe.
+ When this is called we are currently running as the connection
+ user. Doesn't modify current_user.
+****************************************************************************/
+
+BOOL become_authenticated_pipe_user(pipes_struct *p)
+{
+ if (!push_sec_ctx())
+ return False;
+
+ set_sec_ctx(p->pipe_user.uid, p->pipe_user.gid,
+ p->pipe_user.ngroups, p->pipe_user.groups, p->pipe_user.nt_user_token);
+
+ return True;
+}
+
+/****************************************************************************
+ Unbecome the user of an authenticated connected named pipe.
+ When this is called we are running as the authenticated pipe
+ user and need to go back to being the connection user. Doesn't modify
+ current_user.
+****************************************************************************/
+
+BOOL unbecome_authenticated_pipe_user(void)
+{
+ return pop_sec_ctx();
+}
+
+/****************************************************************************
+ Utility functions used by become_xxx/unbecome_xxx.
+****************************************************************************/
+
+struct conn_ctx {
+ connection_struct *conn;
+ uint16 vuid;
+};
+
+/* A stack of current_user connection contexts. */
+
+static struct conn_ctx conn_ctx_stack[MAX_SEC_CTX_DEPTH];
+static int conn_ctx_stack_ndx;
+
+static void push_conn_ctx(void)
+{
+ struct conn_ctx *ctx_p;
+
+ /* Check we don't overflow our stack */
+
+ if (conn_ctx_stack_ndx == MAX_SEC_CTX_DEPTH) {
+ DEBUG(0, ("Connection context stack overflow!\n"));
+ smb_panic("Connection context stack overflow!\n");
+ }
+
+ /* Store previous user context */
+ ctx_p = &conn_ctx_stack[conn_ctx_stack_ndx];
+
+ ctx_p->conn = current_user.conn;
+ ctx_p->vuid = current_user.vuid;
+
+ DEBUG(3, ("push_conn_ctx(%u) : conn_ctx_stack_ndx = %d\n",
+ (unsigned int)ctx_p->vuid, conn_ctx_stack_ndx ));
+
+ conn_ctx_stack_ndx++;
+}
+
+static void pop_conn_ctx(void)
+{
+ struct conn_ctx *ctx_p;
+
+ /* Check for stack underflow. */
+
+ if (conn_ctx_stack_ndx == 0) {
+ DEBUG(0, ("Connection context stack underflow!\n"));
+ smb_panic("Connection context stack underflow!\n");
+ }
+
+ conn_ctx_stack_ndx--;
+ ctx_p = &conn_ctx_stack[conn_ctx_stack_ndx];
+
+ current_user.conn = ctx_p->conn;
+ current_user.vuid = ctx_p->vuid;
+
+ ctx_p->conn = NULL;
+ ctx_p->vuid = UID_FIELD_INVALID;
+}
+
+void init_conn_ctx(void)
+{
+ int i;
+
+ /* Initialise connection context stack */
+ for (i = 0; i < MAX_SEC_CTX_DEPTH; i++) {
+ conn_ctx_stack[i].conn = NULL;
+ conn_ctx_stack[i].vuid = UID_FIELD_INVALID;
+ }
+}
+
+/****************************************************************************
+ Temporarily become a root user. Must match with unbecome_root(). Saves and
+ restores the connection context.
+****************************************************************************/
+
+void become_root(void)
+{
+ push_sec_ctx();
+ push_conn_ctx();
+ set_root_sec_ctx();
+}
+
+/* Unbecome the root user */
+
+void unbecome_root(void)
+{
+ pop_sec_ctx();
+ pop_conn_ctx();
+}
+
+/****************************************************************************
+ Push the current security context then force a change via change_to_user().
+ Saves and restores the connection context.
+****************************************************************************/
+
+BOOL become_user(connection_struct *conn, uint16 vuid)
+{
+ if (!push_sec_ctx())
+ return False;
+
+ push_conn_ctx();
+
+ if (!change_to_user(conn, vuid)) {
+ pop_sec_ctx();
+ pop_conn_ctx();
+ return False;
+ }
+
+ return True;
+}
+
+BOOL unbecome_user(void)
+{
+ pop_sec_ctx();
+ pop_conn_ctx();
+ return True;
+}
+
+/*****************************************************************
+ Convert the suplimentary SIDs returned in a netlogon into UNIX
+ group gid_t's. Add to the total group array.
+*****************************************************************/
+
+void add_supplementary_nt_login_groups(int *n_groups, gid_t **pp_groups, NT_USER_TOKEN **pptok)
+{
+ int total_groups;
+ int current_n_groups = *n_groups;
+ gid_t *final_groups = NULL;
+ size_t i;
+ NT_USER_TOKEN *ptok = *pptok;
+ NT_USER_TOKEN *new_tok = NULL;
+
+ if (!ptok || (ptok->num_sids == 0))
+ return;
+
+ new_tok = dup_nt_token(ptok);
+ if (!new_tok) {
+ DEBUG(0,("add_supplementary_nt_login_groups: Failed to malloc new token\n"));
+ return;
+ }
+ /* Leave the allocated space but empty the number of SIDs. */
+ new_tok->num_sids = 0;
+
+ total_groups = current_n_groups + ptok->num_sids;
+
+ final_groups = (gid_t *)malloc(total_groups * sizeof(gid_t));
+ if (!final_groups) {
+ DEBUG(0,("add_supplementary_nt_login_groups: Failed to malloc new groups.\n"));
+ delete_nt_token(&new_tok);
+ return;
+ }
+
+ memcpy(final_groups, *pp_groups, current_n_groups * sizeof(gid_t));
+ for (i = 0; i < ptok->num_sids; i++) {
+ enum SID_NAME_USE sid_type;
+ gid_t new_grp;
+
+ if (sid_to_gid(&ptok->user_sids[i], &new_grp, &sid_type)) {
+ /*
+ * Don't add the gid_t if it is already in the current group
+ * list. Some UNIXen don't like the same group more than once.
+ */
+ int j;
+
+ for (j = 0; j < current_n_groups; j++)
+ if (final_groups[j] == new_grp)
+ break;
+
+ if ( j == current_n_groups) {
+ /* Group not already present. */
+ final_groups[current_n_groups++] = new_grp;
+ }
+ } else {
+ /* SID didn't map. Copy to the new token to be saved. */
+ sid_copy(&new_tok->user_sids[new_tok->num_sids++], &ptok->user_sids[i]);
+ }
+ }
+
+ SAFE_FREE(*pp_groups);
+ *pp_groups = final_groups;
+ *n_groups = current_n_groups;
+
+ /* Replace the old token with the truncated one. */
+ delete_nt_token(&ptok);
+ *pptok = new_tok;
+}
+
+/*****************************************************************
+ *THE CANONICAL* convert name to SID function.
+ Tries local lookup first - for local domains - then uses winbind.
+*****************************************************************/
+
+BOOL lookup_name(const char *domain, const char *name, DOM_SID *psid, enum SID_NAME_USE *name_type)
+{
+ extern pstring global_myname;
+ extern fstring global_myworkgroup;
+ fstring sid;
+ BOOL ret = False;
+
+ *name_type = SID_NAME_UNKNOWN;
+
+ /* If we are looking up a domain user, make sure it is
+ for the local machine only */
+
+ switch (lp_server_role()) {
+ case ROLE_DOMAIN_PDC:
+ case ROLE_DOMAIN_BDC:
+ if (strequal(domain, global_myworkgroup)) {
+ ret = local_lookup_name(name, psid, name_type);
+ }
+ /* No break is deliberate here. JRA. */
+ default:
+ if (ret) {
+ } else if (strequal(global_myname, domain)) {
+ ret = local_lookup_name(name, psid, name_type);
+ } else {
+ DEBUG(5, ("lookup_name: domain %s is not local\n", domain));
+ }
+ }
+
+ if (ret) {
+ DEBUG(10,
+ ("lookup_name: (local) [%s]\\[%s] -> SID %s (type %u)\n",
+ domain, name, sid_to_string(sid,psid),
+ (unsigned int)*name_type ));
+ return True;
+ } else if (winbind_lookup_name(domain, name, psid, name_type) || (*name_type != SID_NAME_USER) ) {
+
+ DEBUG(10,("lookup_name (winbindd): [%s]\\[%s] -> SID %s (type %u)\n",
+ domain, name, sid_to_string(sid, psid),
+ (unsigned int)*name_type));
+ return True;
+ }
+
+ DEBUG(10, ("lookup_name: winbind and local lookups for [%s]\\[%s] failed\n", domain, name));
+
+ return False;
+}
+
+/*****************************************************************
+ *THE CANONICAL* convert SID to name function.
+ Tries local lookup first - for local sids, then tries winbind.
+*****************************************************************/
+
+BOOL lookup_sid(DOM_SID *sid, fstring dom_name, fstring name, enum SID_NAME_USE *name_type)
+{
+ if (!name_type)
+ return False;
+
+ *name_type = SID_NAME_UNKNOWN;
+
+ /* Check if this is our own sid. This should perhaps be done by
+ winbind? For the moment handle it here. */
+
+ if (sid->num_auths == 5) {
+ DOM_SID tmp_sid;
+ uint32 rid;
+
+ sid_copy(&tmp_sid, sid);
+ sid_split_rid(&tmp_sid, &rid);
+
+ if (sid_equal(&global_sam_sid, &tmp_sid)) {
+
+ return map_domain_sid_to_name(&tmp_sid, dom_name) &&
+ local_lookup_sid(sid, name, name_type);
+ }
+ }
+
+ if (!winbind_lookup_sid(sid, dom_name, name, name_type)) {
+ fstring sid_str;
+ DOM_SID tmp_sid;
+ uint32 rid;
+
+ DEBUG(10,("lookup_sid: winbind lookup for SID %s failed - trying local.\n", sid_to_string(sid_str, sid) ));
+
+ sid_copy(&tmp_sid, sid);
+ sid_split_rid(&tmp_sid, &rid);
+ return map_domain_sid_to_name(&tmp_sid, dom_name) &&
+ lookup_known_rid(&tmp_sid, rid, name, name_type);
+ }
+ return True;
+}
+
+/*****************************************************************
+ *THE CANONICAL* convert uid_t to SID function.
+ Tries winbind first - then uses local lookup.
+ Returns SID pointer.
+*****************************************************************/
+
+DOM_SID *uid_to_sid(DOM_SID *psid, uid_t uid)
+{
+ uid_t low, high;
+ fstring sid;
+
+ if (lp_winbind_uid(&low, &high) && uid >= low && uid <= high) {
+ if (winbind_uid_to_sid(psid, uid)) {
+
+ DEBUG(10,("uid_to_sid: winbindd %u -> %s\n",
+ (unsigned int)uid, sid_to_string(sid, psid)));
+
+ return psid;
+ }
+ }
+
+ local_uid_to_sid(psid, uid);
+
+ DEBUG(10,("uid_to_sid: local %u -> %s\n", (unsigned int)uid, sid_to_string(sid, psid)));
+
+ return psid;
+}
+
+/*****************************************************************
+ *THE CANONICAL* convert gid_t to SID function.
+ Tries winbind first - then uses local lookup.
+ Returns SID pointer.
+*****************************************************************/
+
+DOM_SID *gid_to_sid(DOM_SID *psid, gid_t gid)
+{
+ gid_t low, high;
+ fstring sid;
+
+ if (lp_winbind_gid(&low, &high) && gid >= low && gid <= high) {
+ if (winbind_gid_to_sid(psid, gid)) {
+
+ DEBUG(10,("gid_to_sid: winbindd %u -> %s\n",
+ (unsigned int)gid, sid_to_string(sid, psid)));
+
+ return psid;
+ }
+ }
+
+ local_gid_to_sid(psid, gid);
+
+ DEBUG(10,("gid_to_sid: local %u -> %s\n", (unsigned int)gid, sid_to_string(sid, psid)));
+
+ return psid;
+}
+
+/*****************************************************************
+ *THE CANONICAL* convert SID to uid function.
+ Tries winbind first - then uses local lookup.
+ Returns True if this name is a user sid and the conversion
+ was done correctly, False if not. sidtype is set by this function.
+*****************************************************************/
+
+BOOL sid_to_uid(DOM_SID *psid, uid_t *puid, enum SID_NAME_USE *sidtype)
+{
+ fstring sid_str;
+
+ /* if we know its local then don't try winbindd */
+ if (sid_compare_domain(&global_sam_sid, psid) == 0) {
+ return local_sid_to_uid(puid, psid, sidtype);
+ }
+
+/* (tridge) I commented out the slab of code below in order to support foreign SIDs
+ Do we really need to validate the type of SID we have in this case?
+*/
+#if 0
+ fstring dom_name, name;
+ enum SID_NAME_USE name_type;
+
+ *sidtype = SID_NAME_UNKNOWN;
+ /*
+ * First we must look up the name and decide if this is a user sid.
+ */
+
+ if ( (!winbind_lookup_sid(psid, dom_name, name, &name_type)) || (name_type != SID_NAME_USER) ) {
+ DEBUG(10,("sid_to_uid: winbind lookup for sid %s failed - trying local.\n",
+ sid_to_string(sid_str, psid) ));
+
+ return local_sid_to_uid(puid, psid, sidtype);
+ }
+
+ /*
+ * Ensure this is a user sid.
+ */
+
+ if (name_type != SID_NAME_USER) {
+ DEBUG(10,("sid_to_uid: winbind lookup succeeded but SID is not a uid (%u)\n",
+ (unsigned int)name_type ));
+ return False;
+ }
+#endif
+ *sidtype = SID_NAME_USER;
+
+ /*
+ * Get the uid for this SID.
+ */
+
+ if (!winbind_sid_to_uid(puid, psid)) {
+ DEBUG(10,("sid_to_uid: winbind lookup for sid %s failed.\n",
+ sid_to_string(sid_str, psid) ));
+ return local_sid_to_uid(puid, psid, sidtype);
+ }
+
+ DEBUG(10,("sid_to_uid: winbindd %s -> %u\n",
+ sid_to_string(sid_str, psid),
+ (unsigned int)*puid ));
+
+ return True;
+}
+
+/*****************************************************************
+ *THE CANONICAL* convert SID to gid function.
+ Tries winbind first - then uses local lookup.
+ Returns True if this name is a user sid and the conversion
+ was done correctly, False if not.
+*****************************************************************/
+
+BOOL sid_to_gid(DOM_SID *psid, gid_t *pgid, enum SID_NAME_USE *sidtype)
+{
+ fstring dom_name, name, sid_str;
+ enum SID_NAME_USE name_type;
+
+ *sidtype = SID_NAME_UNKNOWN;
+
+ /*
+ * First we must look up the name and decide if this is a group sid.
+ */
+
+ if (!winbind_lookup_sid(psid, dom_name, name, &name_type)) {
+ DEBUG(10,("sid_to_gid: winbind lookup for sid %s failed - trying local.\n",
+ sid_to_string(sid_str, psid) ));
+
+ if (!local_sid_to_gid(pgid, psid, sidtype)) {
+ /* this was probably a foreign sid - assume its a group rid
+ and continue */
+ name_type = SID_NAME_DOM_GRP;
+ } else {
+ return True;
+ }
+ }
+
+ /*
+ * Ensure this is a group sid.
+ */
+
+ if ((name_type != SID_NAME_DOM_GRP) && (name_type != SID_NAME_ALIAS) && (name_type != SID_NAME_WKN_GRP)) {
+ DEBUG(10,("sid_to_gid: winbind lookup succeeded but SID is not a known group (%u)\n",
+ (unsigned int)name_type ));
+
+ return local_sid_to_gid(pgid, psid, sidtype);
+ }
+
+ *sidtype = name_type;
+
+ /*
+ * Get the gid for this SID.
+ */
+
+ if (!winbind_sid_to_gid(pgid, psid)) {
+ DEBUG(10,("sid_to_gid: winbind lookup for sid %s failed.\n",
+ sid_to_string(sid_str, psid) ));
+ return False;
+ }
+
+ DEBUG(10,("sid_to_gid: winbindd %s -> %u\n",
+ sid_to_string(sid_str, psid),
+ (unsigned int)*pgid ));
+
+ return True;
+}
+
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