+#define OLD_NTDOMAIN 1
+
/*
Unix SMB/Netbios implementation.
Version 1.9.
extern int DEBUGLEVEL;
-static int initial_uid;
-static int initial_gid;
-
/* what user is current? */
-struct current_user current_user;
-
-pstring OriginalDir;
+extern struct current_user current_user;
/****************************************************************************
-initialise the uid routines
+ Become the guest user.
****************************************************************************/
-void init_uid(void)
+
+BOOL become_guest(void)
{
- initial_uid = current_user.uid = geteuid();
- initial_gid = current_user.gid = getegid();
-
- if (initial_gid != 0 && initial_uid == 0)
- {
-#ifdef HPUX
- setresgid(0,0,0);
-#else
- setgid(0);
- setegid(0);
+ static struct passwd *pass=NULL;
+
+ if (!pass)
+ pass = Get_Pwnam(lp_guestaccount(-1),True);
+ if (!pass)
+ return(False);
+
+#ifdef AIX
+ /* MWW: From AIX FAQ patch to WU-ftpd: call initgroups before
+ setting IDs */
+ initgroups(pass->pw_name, (gid_t)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;
+}
- initial_uid = geteuid();
- initial_gid = getegid();
+/*******************************************************************
+ Check if a username is OK.
+********************************************************************/
- current_user.cnum = -1;
- current_user.vuid = UID_FIELD_INVALID;
+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);
- ChDir(OriginalDir);
-}
+ 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 specified uid
+ Become the user of a connection number.
****************************************************************************/
-static BOOL become_uid(int uid)
+
+BOOL become_user(connection_struct *conn, uint16 vuid)
{
- if (initial_uid != 0)
- return(True);
+ 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,("Connection not open\n"));
+ return(False);
+ }
- if (uid == -1 || uid == 65535) {
- DEBUG(1,("WARNING: using uid %d is a security risk\n",uid));
- }
+ /*
+ * 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,("Skipping become_user - already user\n"));
+ return(True);
+ } else if ((current_user.conn == conn) &&
+ (vuser != 0) && (current_user.vuid == vuid) &&
+ (current_user.uid == vuser->uid)) {
+ DEBUG(4,("Skipping become_user - already user\n"));
+ return(True);
+ }
-#ifdef AIX
- {
- /* AIX 3 stuff - inspired by a code fragment in wu-ftpd */
- /* MWW: This is all undocumented, of course. There's a patch to WU-ftpd
- in the AIX FAQ which does the setpriv, then sets the gid stuff, then
- sets uid. Since Samba separates setting the gid and setting the uid,
- I've duplicated the setpriv code in become_gid. I've also made the
- requisite changes to become_gid to match the WU-ftpd patch.
-
- I believe we'll still get errors in the Samba logs. This setpriv
- call is supposed to disable "trapdooring" on AIX - ie. normally
- once a seteuid / setegid is done, the effective ID can't be set back
- to what it was before. See the comments in become_root / unbecome_root.
- I *think* that we may have to do something additional here to prevent
- the "Can't set uid (AIX3)" messages, though - possibly change the
- values of priv.pv_priv to keep the SET_PROC_DAC privilege, and
- possibly SET_OBJ_DAC and SET_OBJ_STAT as well.
-
- The pv_priv array is two longwords, and the constants in sys/priv.h
- have values between 1 and 64, according to the comments in priv.h.
- This strongly suggests a bit vector - but does BYPASS_DAC_WRITE
- (#define'd to 1) mean 1<<0 or 1<<1? Unfortunately, nothing's
- defined to 0 or 64, which would be a dead giveaway. Also, what's the
- fullword-boundary endianness? That is, is pv_priv[0] the high or
- the low 32 bits? Fortunately, the values used by "su" (see below)
- don't make much sense if pv_priv[0] is the high bits. Also, based
- on analysis of the values used by su, I concluded that, for example,
- BYPASS_DAC_READ (defined to 2) is bit "2" counting from 1 - ie.
- if (pv_priv[0] & (1 << (BYPASS_DAC_READ - 1))) then BYPASS_DAC_READ
- is on. That's a bit odd, but it makes more sense than if the
- privilege constants are meant to be taken as exponents of 2.
-
- For analysis, I ran "su" as root under dbx, and stopped in setpriv.
- The first argument to setpriv can be examined using
-
- print $r3 (eg. "0x30009" = PRIV_SET|PRIV_MAXIMUM|PRIV_EFFECTIV)
-
- the contents of the pv_priv array can be examined using
-
- ($r4)/2X
-
- Here's what su does:
-
- setpriv(PRIV_SET | PRIV_INHERITED | PRIV_BEQUEATH, {0,0})
- setpriv(PRIV_SET | PRIV_EFFECTIVE | PRIV_MAXIMUM,
- {0x02800006, 0x00040000})
- 0x02800006 = SET_PROC_AUDIT | SET_PROC_ENV |
- BYPASS_DAC_EXEC | BYPASS_DAC_READ
- 0x00040000 = TPATH_CONFIG
- setpriv(PRIV_SET | PRIV_EFFECTIVE, {0, 0})
-
- Analysis:
-
- Reduce inherited privileges to none, so the child doesn't inherit
- anything special.
- Change su's privileges so it can execute the shell even if someone
- has goofed up the permissions to it or to directories on the
- search path; so it can set the process auditing characteristics
- and privileged environment (stuff in /etc/security/environ with
- the sysenv attribute); and so that it can set the trusted path
- characteristics for this login.
- Zap those privileges back off when we don't need them any more.
-
- I'm guessing we want to keep SET_PROC_DAC in the current priv set,
- but not in the inherited one. That is, set PRIV_INHERITED and
- PRIV_BEQUEATH to 0. We also probably want to set PRIV_MAXIMUM and
- PRIV_EFFECTIVE to only the privs we need, which at this point would
- appear to be just SET_PROC_DAC. *Note*: setting PRIV_MAXIMUM
- with any of the privilege sets higher than what you're trying to
- set the maximum to will produce an EINVAL. For example, if we
- try to set PRIV_MAXIMUM to SET_PROC_DAC *before* we reduce
- PRIV_INHERITED and PRIV_BEQUEATH, it won't work. Zero out the
- inherited privileges first.
-
- Some experimentation with simple programs confirms that if we're
- running with an EUID of 0 we can switch our UID/EUID back and
- forth with setuidx - *unless* we call setpriv({0,0}, ...) first.
- In other words, by default root has SET_PROC_DAT set, but we can
- remove it from our privilege set. This is what we want to do for
- child processes, I believe.
-
- Also, calling setpriv(PRIV_SUB|PRIV_EFFECTIVE,...) with pv_priv[0]
- set to SET_PROC_DAC (1 << (SET_PROC_DAC - 1)) will prevent an
- EUID-root process from switching its EUID back with setuidx.
-
- In other words, setuidx on AIX is *not* trapdoor. setuid is
- trapdoor. We need a non-trapdoor setuid function, but we don't
- want processes we fork to have access to it. Thus we use setuidx
- but first we disable it for our children.
-
- Note, however, that we can only increase our privileges (as we
- do in the first call to setpriv) if we're EUID-root. If we
- started out as root, and then switched to a non-root user ID,
- that's OK; we've already set them. Just don't try to set them
- again.
-
- Also, I suspect that after using setpriv / setuidx / etc. here in
- the AIX-specific code we DON'T want to fall through to the code that
- calls setuid, etc. However, I haven't noticed any more problems with
- the code the way it is here.
- */
-
- priv_t priv;
-
- priv.pv_priv[0] = 0;
- priv.pv_priv[1] = 0;
- if (setpriv(PRIV_SET|PRIV_INHERITED|PRIV_BEQUEATH,
- &priv, sizeof(priv_t)) < 0) {
- DEBUG(1, ("Can't set child privileges (AIX3): %s\n", strerror(errno)));
- }
-
- priv.pv_priv[0] = (1 << (SET_PROC_DAC - 1));
- if (setpriv(PRIV_SET|PRIV_EFFECTIVE|PRIV_MAXIMUM,
- &priv, sizeof(priv_t)) < 0) {
- DEBUG(1, ("Can't set own privileges (AIX3): %s\n", strerror(errno)));
- }
-
- if (setuidx(ID_REAL|ID_EFFECTIVE, (uid_t)uid) < 0 ||
- seteuid((uid_t)uid) < 0) {
- DEBUG(1,("Can't set uid (AIX3)\n"));
- }
- }
-#endif
+ 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 ||
+ !(vuser) || (vuser->guest)) {
+ 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,("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;
+ }
-#ifdef USE_SETRES
- if (setresuid(-1,uid,-1) != 0)
-#elif defined(USE_SETFS)
- if (setfsuid(uid) != 0)
-#else
- if ((seteuid(uid) != 0) &&
- (setuid(uid) != 0))
-#endif
- {
- DEBUG(0,("Couldn't set uid %d currently set to (%d,%d)\n",
- uid,getuid(), geteuid()));
- if (uid > 32000)
- DEBUG(0,("Looks like your OS doesn't like high uid values - try using a different account\n"));
- return(False);
- }
-
- if (((uid == -1) || (uid == 65535)) && geteuid() != uid) {
- DEBUG(0,("Invalid uid -1. perhaps you have a account with uid 65535?\n"));
- return(False);
- }
-
- current_user.uid = uid;
-
- return(True);
-}
+ /*
+ * 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);
+ 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,("become_user uid=(%d,%d) gid=(%d,%d)\n",
+ (int)getuid(),(int)geteuid(),(int)getgid(),(int)getegid()));
+
+ return(True);
+}
/****************************************************************************
- become the specified gid
+ Unbecome the user of a connection number.
****************************************************************************/
-static BOOL become_gid(int gid)
-{
- if (initial_uid != 0)
- return(True);
- if (gid == -1 || gid == 65535) {
- DEBUG(1,("WARNING: using gid %d is a security risk\n",gid));
- }
-
-#ifdef AIX
- {
- /* MWW: See comment above in become_uid. */
- priv_t priv;
-
- priv.pv_priv[0] = 0;
- priv.pv_priv[1] = 0;
- if (setpriv(PRIV_SET|PRIV_INHERITED|PRIV_EFFECTIVE|PRIV_BEQUEATH,
- &priv, sizeof(priv_t)) < 0) {
- DEBUG(1, ("Can't set privilege (AIX3)\n"));
- }
- if (setgidx(ID_REAL|ID_EFFECTIVE, (gid_t)gid) < 0 ||
- setegid((gid_t)gid) < 0) {
- DEBUG(1,("Can't set gid (AIX3)\n"));
- }
- }
-#endif
+BOOL unbecome_user(void )
+{
+ set_root_sec_ctx();
-#ifdef USE_SETRES
- if (setresgid(-1,gid,-1) != 0)
-#elif defined(USE_SETFS)
- if (setfsgid(gid) != 0)
-#else
- if (setgid(gid) != 0)
-#endif
- {
- DEBUG(0,("Couldn't set gid %d currently set to (%d,%d)\n",
- gid,getgid(),getegid()));
- if (gid > 32000)
- DEBUG(0,("Looks like your OS doesn't like high gid values - try using a different account\n"));
- return(False);
- }
+ DEBUG(5,("unbecome_user now uid=(%d,%d) gid=(%d,%d)\n",
+ (int)getuid(),(int)geteuid(),(int)getgid(),(int)getegid()));
- current_user.gid = gid;
+ current_user.conn = NULL;
+ current_user.vuid = UID_FIELD_INVALID;
- return(True);
+ return(True);
}
-
/****************************************************************************
- become the specified uid and gid
+ Become the user of an authenticated connected named pipe.
+ When this is called we are currently running as the connection
+ user.
****************************************************************************/
-static BOOL become_id(int uid,int gid)
+
+BOOL become_authenticated_pipe_user(pipes_struct *p)
{
- return(become_gid(gid) && become_uid(uid));
+ BOOL res = push_sec_ctx();
+
+ if (!res) {
+ 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;
}
/****************************************************************************
-become the guest user
+ 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.
****************************************************************************/
-BOOL become_guest(void)
+
+BOOL unbecome_authenticated_pipe_user(pipes_struct *p)
{
- BOOL ret;
- static struct passwd *pass=NULL;
+ return pop_sec_ctx();
+}
- if (initial_uid != 0)
- return(True);
+/* Temporarily become a root user. Must match with unbecome_root(). */
- if (!pass)
- pass = Get_Pwnam(lp_guestaccount(-1),True);
- if (!pass) return(False);
+void become_root(void)
+{
+ push_sec_ctx();
+ set_root_sec_ctx();
+}
-#ifdef AIX
- /* MWW: From AIX FAQ patch to WU-ftpd: call initgroups before setting IDs */
- initgroups(pass->pw_name, (gid_t)pass->pw_gid);
-#endif
- ret = become_id(pass->pw_uid,pass->pw_gid);
+/* Unbecome the root user */
- if (!ret)
- DEBUG(1,("Failed to become guest. Invalid guest account?\n"));
+void unbecome_root(void)
+{
+ pop_sec_ctx();
+}
+
+/*****************************************************************
+ *THE CANONICAL* convert name to SID function.
+ Tries winbind first - then uses local lookup.
+*****************************************************************/
- current_user.cnum = -2;
- current_user.vuid = UID_FIELD_INVALID;
+BOOL lookup_name(char *name, DOM_SID *psid, enum SID_NAME_USE *name_type)
+{
+ extern pstring global_myname;
+ extern fstring global_myworkgroup;
+ fstring sid;
+ char *sep = lp_winbind_separator();
+
+ if (!winbind_lookup_name(name, psid, name_type)) {
+ BOOL ret;
+
+ DEBUG(10, ("lookup_name: winbind lookup for %s failed - trying local\n", name));
+
+ /* If we are looking up a domain user, make sure it is
+ for the local machine only */
+
+ if (strchr(name, sep[0]) || strchr(name, '\\')) {
+ fstring domain, username;
+
+ split_domain_name(name, domain, username);
+
+ switch (lp_server_role()) {
+ case ROLE_DOMAIN_PDC:
+ case ROLE_DOMAIN_BDC:
+ if (strequal(domain, global_myworkgroup))
+ fstrcpy(domain, global_myname);
+ /* No break is deliberate here. JRA. */
+ default:
+ if (strcasecmp(global_myname, domain) != 0) {
+ DEBUG(5, ("domain %s is not local\n", domain));
+ return False;
+ }
+ }
+
+ ret = local_lookup_name(domain, username, psid,
+ name_type);
+ } else {
+
+ ret = local_lookup_name(global_myname, name, psid,
+ name_type);
+ }
+
+ if (ret) {
+ DEBUG(10,
+ ("lookup_name: (local) %s -> SID %s (type %u)\n",
+ name, sid_to_string(sid,psid),
+ (unsigned int)*name_type ));
+ } else {
+ DEBUG(10,("lookup name: (local) %s failed.\n", name));
+ }
+
+ return ret;
+ }
- return(ret);
+ DEBUG(10,("lookup_name (winbindd): %s -> SID %s (type %u)\n",
+ name, sid_to_string(sid, psid),
+ (unsigned int)*name_type));
+ return True;
}
-/*******************************************************************
-check if a username is OK
-********************************************************************/
-static BOOL check_user_ok(connection_struct *conn, user_struct *vuser,int snum)
+/*****************************************************************
+ *THE CANONICAL* convert SID to name function.
+ Tries winbind first - then uses local lookup.
+*****************************************************************/
+
+BOOL lookup_sid(DOM_SID *sid, fstring dom_name, fstring name, enum SID_NAME_USE *name_type)
{
- int i;
- for (i=0;i<conn->uid_cache.entries;i++)
- if (conn->uid_cache.list[i] == vuser->uid) return(True);
+ if (!name_type)
+ return False;
- if (!user_ok(vuser->name,snum)) return(False);
+ /* Check if this is our own sid. This should perhaps be done by
+ winbind? For the moment handle it here. */
- i = conn->uid_cache.entries % UID_CACHE_SIZE;
- conn->uid_cache.list[i] = vuser->uid;
+ if (sid->num_auths == 5) {
+ DOM_SID tmp_sid;
+ uint32 rid;
- if (conn->uid_cache.entries < UID_CACHE_SIZE)
- conn->uid_cache.entries++;
+ sid_copy(&tmp_sid, sid);
+ sid_split_rid(&tmp_sid, &rid);
- return(True);
-}
+ if (sid_equal(&global_sam_sid, &tmp_sid)) {
+ return map_domain_sid_to_name(&tmp_sid, dom_name) &&
+ local_lookup_rid(rid, name, name_type);
+ }
+ }
-/****************************************************************************
- become the user of a connection number
-****************************************************************************/
-BOOL become_user(connection_struct *conn, int cnum, uint16 vuid)
-{
- user_struct *vuser = get_valid_user_struct(vuid);
- int snum,gid;
- int uid;
-
- if ((current_user.cnum == cnum) && (vuser != 0) && (current_user.vuid == vuid) &&
- (current_user.uid == vuser->uid)) {
- DEBUG(4,("Skipping become_user - already user\n"));
- return(True);
- }
-
- unbecome_user();
-
- if (!(VALID_CNUM(cnum) && conn->open)) {
- DEBUG(2,("Connection %d not open\n",cnum));
- return(False);
- }
-
- snum = conn->service;
-
- if((vuser != NULL) && !check_user_ok(conn, vuser, snum))
- return False;
-
- if (conn->force_user ||
- lp_security() == SEC_SHARE ||
- !(vuser) || (vuser->guest)
- )
- {
- uid = conn->uid;
- gid = conn->gid;
- current_user.groups = conn->groups;
- current_user.igroups = conn->igroups;
- current_user.ngroups = conn->ngroups;
- current_user.attrs = conn->attrs;
- }
- else
- {
- if (!vuser) {
- DEBUG(2,("Invalid vuid used %d\n",vuid));
- return(False);
- }
- uid = vuser->uid;
- if(!*lp_force_group(snum))
- gid = vuser->gid;
- else
- gid = conn->gid;
- current_user.ngroups = vuser->n_groups;
- current_user.groups = vuser->groups;
- current_user.igroups = vuser->igroups;
- current_user.attrs = vuser->attrs;
- }
-
- if (initial_uid == 0)
- {
- if (!become_gid(gid)) return(False);
-
-#ifndef NO_SETGROUPS
- if (!(VALID_CNUM(cnum) && conn->ipc)) {
- /* groups stuff added by ih/wreu */
- if (current_user.ngroups > 0)
- if (setgroups(current_user.ngroups,current_user.groups)<0)
- DEBUG(0,("setgroups call failed!\n"));
- }
-#endif
-
- if (!conn->admin_user && !become_uid(uid))
- return(False);
- }
+ if (!winbind_lookup_sid(sid, dom_name, name, name_type)) {
+ fstring sid_str;
+ DOM_SID tmp_sid;
+ uint32 rid;
- current_user.cnum = cnum;
- current_user.vuid = vuid;
+ DEBUG(10,("lookup_sid: winbind lookup for SID %s failed - trying local.\n", sid_to_string(sid_str, sid) ));
- DEBUG(5,("become_user uid=(%d,%d) gid=(%d,%d)\n",
- getuid(),geteuid(),getgid(),getegid()));
-
- return(True);
+ 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;
}
-/****************************************************************************
- unbecome the user of a connection number
-****************************************************************************/
-BOOL unbecome_user(void )
+/*****************************************************************
+ *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)
{
- if (current_user.cnum == -1)
- return(False);
-
- ChDir(OriginalDir);
-
- if (initial_uid == 0)
- {
-#ifdef USE_SETRES
- setresuid(-1,getuid(),-1);
- setresgid(-1,getgid(),-1);
-#elif defined(USE_SETFS)
- setfsuid(initial_uid);
- setfsgid(initial_gid);
-#else
- if (seteuid(initial_uid) != 0)
- setuid(initial_uid);
- setgid(initial_gid);
-#endif
- }
-#ifdef NO_EID
- if (initial_uid == 0)
- DEBUG(2,("Running with no EID\n"));
- initial_uid = getuid();
- initial_gid = getgid();
-#else
- if (geteuid() != initial_uid)
- {
- DEBUG(0,("Warning: You appear to have a trapdoor uid system\n"));
- initial_uid = geteuid();
- }
- if (getegid() != initial_gid)
- {
- DEBUG(0,("Warning: You appear to have a trapdoor gid system\n"));
- initial_gid = getegid();
- }
-#endif
+ fstring sid;
- current_user.uid = initial_uid;
- current_user.gid = initial_gid;
-
- if (ChDir(OriginalDir) != 0)
- DEBUG(0,("%s chdir(%s) failed in unbecome_user\n",
- timestring(),OriginalDir));
+ if (!winbind_uid_to_sid(psid, uid)) {
+ DEBUG(10,("uid_to_sid: winbind lookup for uid %u failed - trying local.\n", (unsigned int)uid ));
- DEBUG(5,("unbecome_user now uid=(%d,%d) gid=(%d,%d)\n",
- getuid(),geteuid(),getgid(),getegid()));
+ return local_uid_to_sid(psid, uid);
+ }
- current_user.cnum = -1;
- current_user.vuid = UID_FIELD_INVALID;
+ DEBUG(10,("uid_to_sid: winbindd %u -> %s\n",
+ (unsigned int)uid, sid_to_string(sid, psid) ));
- return(True);
+ return psid;
}
+/*****************************************************************
+ *THE CANONICAL* convert gid_t to SID function.
+ Tries winbind first - then uses local lookup.
+ Returns SID pointer.
+*****************************************************************/
-/****************************************************************************
-This is a utility function of smbrun(). It must be called only from
-the child as it may leave the caller in a privilaged state.
-****************************************************************************/
-static BOOL setup_stdout_file(char *outfile,BOOL shared)
-{
- int fd;
- struct stat st;
- mode_t mode = S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH;
- int flags = O_RDWR|O_CREAT|O_TRUNC|O_EXCL;
-
- close(1);
-
- if (shared) {
- /* become root - unprivilaged users can't delete these files */
-#ifdef USE_SETRES
- setresgid(0,0,0);
- setresuid(0,0,0);
-#else
- setuid(0);
- seteuid(0);
-#endif
- }
-
- if(stat(outfile, &st) == 0) {
- /* Check we're not deleting a device file. */
- if(st.st_mode & S_IFREG)
- unlink(outfile);
- else
- flags = O_RDWR;
- }
- /* now create the file */
- fd = open(outfile,flags,mode);
-
- if (fd == -1) return False;
-
- if (fd != 1) {
- if (dup2(fd,1) != 0) {
- DEBUG(2,("Failed to create stdout file descriptor\n"));
- close(fd);
- return False;
- }
- close(fd);
- }
- return True;
-}
+DOM_SID *gid_to_sid(DOM_SID *psid, gid_t gid)
+{
+ fstring sid;
+ if (!winbind_gid_to_sid(psid, gid)) {
+ DEBUG(10,("gid_to_sid: winbind lookup for gid %u failed - trying local.\n", (unsigned int)gid ));
-/****************************************************************************
-run a command being careful about uid/gid handling and putting the output in
-outfile (or discard it if outfile is NULL).
+ return local_gid_to_sid(psid, gid);
+ }
-if shared is True then ensure the file will be writeable by all users
-but created such that its owned by root. This overcomes a security hole.
+ DEBUG(10,("gid_to_sid: winbindd %u -> %s\n",
+ (unsigned int)gid, sid_to_string(sid,psid) ));
-if shared is not set then open the file with O_EXCL set
-****************************************************************************/
-int smbrun(char *cmd,char *outfile,BOOL shared)
+ 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.
+*****************************************************************/
+
+BOOL sid_to_uid(DOM_SID *psid, uid_t *puid, enum SID_NAME_USE *sidtype)
{
- int fd,pid;
- int uid = current_user.uid;
- int gid = current_user.gid;
-
-#if USE_SYSTEM
- int ret;
- pstring syscmd;
- char *path = lp_smbrun();
-
- /* in the old method we use system() to execute smbrun which then
- executes the command (using system() again!). This involves lots
- of shell launches and is very slow. It also suffers from a
- potential security hole */
- if (!file_exist(path,NULL))
- {
- DEBUG(0,("SMBRUN ERROR: Can't find %s. Installation problem?\n",path));
- return(1);
- }
-
- slprintf(syscmd,sizeof(syscmd)-1,"%s %d %d \"(%s 2>&1) > %s\"",
- path,uid,gid,cmd,
- outfile?outfile:"/dev/null");
-
- DEBUG(5,("smbrun - running %s ",syscmd));
- ret = system(syscmd);
- DEBUG(5,("gave %d\n",ret));
- return(ret);
-#else
- /* in this newer method we will exec /bin/sh with the correct
- arguments, after first setting stdout to point at the file */
-
- if ((pid=fork())) {
- int status=0;
- /* the parent just waits for the child to exit */
- if (sys_waitpid(pid,&status,0) != pid) {
- DEBUG(2,("waitpid(%d) : %s\n",pid,strerror(errno)));
- return -1;
- }
- return status;
- }
-
-
- /* we are in the child. we exec /bin/sh to do the work for us. we
- don't directly exec the command we want because it may be a
- pipeline or anything else the config file specifies */
-
- /* point our stdout at the file we want output to go into */
- if (outfile && !setup_stdout_file(outfile,shared)) {
- exit(80);
- }
-
- /* now completely lose our privilages. This is a fairly paranoid
- way of doing it, but it does work on all systems that I know of */
-#ifdef USE_SETRES
- setresgid(0,0,0);
- setresuid(0,0,0);
- setresgid(gid,gid,gid);
- setresuid(uid,uid,uid);
-#else
- setuid(0);
- seteuid(0);
- setgid(gid);
- setegid(gid);
- setuid(uid);
- seteuid(uid);
-#endif
+ fstring dom_name, name, sid_str;
+ enum SID_NAME_USE name_type;
- if (getuid() != uid || geteuid() != uid ||
- getgid() != gid || getegid() != gid) {
- /* we failed to lose our privilages - do not execute the command */
- exit(81); /* we can't print stuff at this stage, instead use exit codes
- for debugging */
- }
+ *sidtype = SID_NAME_UNKNOWN;
- /* close all other file descriptors, leaving only 0, 1 and 2. 0 and
- 2 point to /dev/null from the startup code */
- for (fd=3;fd<256;fd++) close(fd);
+ /*
+ * First we must look up the name and decide if this is a user sid.
+ */
- execl("/bin/sh","sh","-c",cmd,NULL);
+ if (!winbind_lookup_sid(psid, dom_name, name, &name_type)) {
+ DEBUG(10,("sid_to_uid: winbind lookup for sid %s failed - trying local.\n",
+ sid_to_string(sid_str, psid) ));
- /* not reached */
- exit(82);
-#endif
- return 1;
-}
+ return local_sid_to_uid(puid, psid, sidtype);
+ }
-static struct current_user current_user_saved;
-static int become_root_depth;
-static pstring become_root_dir;
+ /*
+ * Ensure this is a user sid.
+ */
-/****************************************************************************
-This is used when we need to do a privilaged operation (such as mucking
-with share mode files) and temporarily need root access to do it. This
-call should always be paired with an unbecome_root() call immediately
-after the operation
+ 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;
+ }
-Set save_dir if you also need to save/restore the CWD
-****************************************************************************/
-void become_root(BOOL save_dir)
-{
- if (become_root_depth) {
- DEBUG(0,("ERROR: become root depth is non zero\n"));
+ *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 False;
}
- if (save_dir)
- GetWd(become_root_dir);
- current_user_saved = current_user;
- become_root_depth = 1;
+ DEBUG(10,("sid_to_uid: winbindd %s -> %u\n",
+ sid_to_string(sid_str, psid),
+ (unsigned int)*puid ));
- become_uid(0);
- become_gid(0);
+ return True;
}
-/****************************************************************************
-When the privilaged operation is over call this
+/*****************************************************************
+ *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.
+*****************************************************************/
-Set save_dir if you also need to save/restore the CWD
-****************************************************************************/
-void unbecome_root(BOOL restore_dir)
+BOOL sid_to_gid(DOM_SID *psid, gid_t *pgid, enum SID_NAME_USE *sidtype)
{
- if (become_root_depth != 1) {
- DEBUG(0,("ERROR: unbecome root depth is %d\n",
- become_root_depth));
- }
+ fstring dom_name, name, sid_str;
+ enum SID_NAME_USE name_type;
- /* we might have done a become_user() while running as root,
- if we have then become root again in order to become
- non root! */
- if (current_user.uid != 0) {
- become_uid(0);
- }
+ *sidtype = SID_NAME_UNKNOWN;
- /* restore our gid first */
- if (!become_gid(current_user_saved.gid)) {
- DEBUG(0,("ERROR: Failed to restore gid\n"));
- exit_server("Failed to restore gid");
- }
+ /*
+ * 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) ));
-#ifndef NO_SETGROUPS
- if (current_user_saved.ngroups > 0) {
- if (setgroups(current_user_saved.ngroups,
- current_user_saved.groups)<0)
- DEBUG(0,("ERROR: setgroups call failed!\n"));
+ return local_sid_to_gid(pgid, psid, sidtype);
}
-#endif
- /* now restore our uid */
- if (!become_uid(current_user_saved.uid)) {
- DEBUG(0,("ERROR: Failed to restore uid\n"));
- exit_server("Failed to restore uid");
+ /*
+ * 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);
}
- if (restore_dir)
- ChDir(become_root_dir);
+ *sidtype = name_type;
+
+ /*
+ * Get the gid for this SID.
+ */
- current_user = current_user_saved;
+ 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,("gid_to_uid: winbindd %s -> %u\n",
+ sid_to_string(sid_str, psid),
+ (unsigned int)*pgid ));
- become_root_depth = 0;
+ return True;
}
+
+#undef OLD_NTDOMAIN
git.samba.org / kai / samba.git / blobdiff