int startClient( volatile int *pid ) { const char *home, *sessargs, *desksess; char **env, *xma; char **argv, *fname, *str; #ifdef USE_PAM char ** volatile pam_env; # ifndef HAVE_PAM_GETENVLIST char **saved_env; # endif int pretc; #else # ifdef _AIX char *msg; char **theenv; extern char **newenv; /* from libs.a, this is set up by setpenv */ # endif #endif #ifdef HAVE_SETUSERCONTEXT extern char **environ; #endif char *failsafeArgv[2]; char *buf, *buf2; int i; if (strCmp( dmrcuser, curuser )) { if (curdmrc) { free( curdmrc ); curdmrc = 0; } if (dmrcuser) { free( dmrcuser ); dmrcuser = 0; } } #if defined(USE_PAM) || defined(_AIX) if (!(p = getpwnam( curuser ))) { logError( "getpwnam(%s) failed.\n", curuser ); pError: displayStr( V_MSG_ERR, 0 ); return 0; } #endif #ifndef USE_PAM # ifdef _AIX msg = NULL; loginsuccess( curuser, hostname, tty, &msg ); if (msg) { debug( "loginsuccess() - %s\n", msg ); free( (void *)msg ); } # else /* _AIX */ # if defined(KERBEROS) && defined(AFS) if (krbtkfile[0] != '\0') { if (k_hasafs()) { int fail = 0; if (k_setpag() == -1) { logError( "setpag() for %s failed\n", curuser ); fail = 1; } if ((ret = k_afsklog( NULL, NULL )) != KSUCCESS) { logError( "AFS Warning: %s\n", krb_get_err_text( ret ) ); fail = 1; } if (fail) displayMsg( V_MSG_ERR, "Warning: Problems during Kerberos4/AFS setup." ); } } # endif /* KERBEROS && AFS */ # endif /* _AIX */ #endif /* !PAM */ curuid = p->pw_uid; curgid = p->pw_gid; env = baseEnv( curuser ); xma = 0; strApp( &xma, "method=", curtype, (char *)0 ); if (td_setup) strApp( &xma, ",auto", (char *)0 ); if (xma) { env = setEnv( env, "XDM_MANAGED", xma ); free( xma ); } if (td->autoLock && cursource == PWSRC_AUTOLOGIN) env = setEnv( env, "DESKTOP_LOCKED", "true" ); env = setEnv( env, "PATH", curuid ? td->userPath : td->systemPath ); env = setEnv( env, "SHELL", p->pw_shell ); env = setEnv( env, "HOME", p->pw_dir ); #if !defined(USE_PAM) && !defined(_AIX) && defined(KERBEROS) if (krbtkfile[0] != '\0') env = setEnv( env, "KRBTKFILE", krbtkfile ); #endif userEnviron = inheritEnv( env, envvars ); env = systemEnv( curuser ); systemEnviron = setEnv( env, "HOME", p->pw_dir ); debug( "user environment:\n%[|''>'\n's" "system environment:\n%[|''>'\n's" "end of environments\n", userEnviron, systemEnviron ); /* * for user-based authorization schemes, * add the user to the server's allowed "hosts" list. */ for (i = 0; i < td->authNum; i++) { #ifdef SECURE_RPC if (td->authorizations[i]->name_length == 9 && !memcmp( td->authorizations[i]->name, "SUN-DES-1", 9 )) { XHostAddress addr; char netname[MAXNETNAMELEN+1]; char domainname[MAXNETNAMELEN+1]; getdomainname( domainname, sizeof(domainname) ); user2netname( netname, curuid, domainname ); addr.family = FamilyNetname; addr.length = strlen( netname ); addr.address = netname; XAddHost( dpy, &addr ); } #endif #ifdef K5AUTH if (td->authorizations[i]->name_length == 14 && !memcmp( td->authorizations[i]->name, "MIT-KERBEROS-5", 14 )) { /* Update server's auth file with user-specific info. * Don't need to AddHost because X server will do that * automatically when it reads the cache we are about * to point it at. */ XauDisposeAuth( td->authorizations[i] ); td->authorizations[i] = krb5GetAuthFor( 14, "MIT-KERBEROS-5", td->name ); saveServerAuthorizations( td, td->authorizations, td->authNum ); } #endif } if (*dmrcDir) mergeSessionArgs( TRUE ); debug( "now starting the session\n" ); #ifdef USE_PAM # ifdef HAVE_SETUSERCONTEXT if (setusercontext( lc, p, p->pw_uid, LOGIN_SETGROUP )) { logError( "setusercontext(groups) for %s failed: %m\n", curuser ); goto pError; } # else if (!setGid( curuser, curgid )) goto pError; # endif # ifndef HAVE_PAM_GETENVLIST if (!(pam_env = initStrArr( 0 ))) { resetGids(); goto pError; } saved_env = environ; environ = pam_env; # endif removeCreds = 1; /* set it first - i don't trust PAM's rollback */ pretc = pam_setcred( pamh, 0 ); reInitErrorLog(); # ifndef HAVE_PAM_GETENVLIST pam_env = environ; environ = saved_env; # endif # ifdef HAVE_INITGROUPS /* This seems to be a strange place for it, but do it: - after the initial groups are set - after pam_setcred might have set something, even in the error case - before pam_setcred(DELETE_CRED) might need it */ if (!saveGids()) goto pError; # endif if (pretc != PAM_SUCCESS) { logError( "pam_setcred() for %s failed: %s\n", curuser, pam_strerror( pamh, pretc ) ); resetGids(); return 0; } removeSession = 1; /* set it first - same as above */ pretc = pam_open_session( pamh, 0 ); reInitErrorLog(); if (pretc != PAM_SUCCESS) { logError( "pam_open_session() for %s failed: %s\n", curuser, pam_strerror( pamh, pretc ) ); resetGids(); return 0; } /* we don't want sessreg and the startup/reset scripts run with user credentials. unfortunately, we can reset only the gids. */ resetGids(); # define D_LOGIN_SETGROUP LOGIN_SETGROUP #else /* USE_PAM */ # define D_LOGIN_SETGROUP 0 #endif /* USE_PAM */ removeAuth = 1; chownCtrl( &td->ctrl, curuid ); endpwent(); #if !defined(USE_PAM) && defined(USESHADOW) && !defined(_AIX) endspent(); #endif ctltalk.pipe = &ctlpipe; ASPrintf( &buf, "sub-daemon for display %s", td->name ); ASPrintf( &buf2, "client for display %s", td->name ); switch (gFork( &ctlpipe, buf, buf2, 0, 0, mstrtalk.pipe, pid )) { case 0: gCloseOnExec( ctltalk.pipe ); if (Setjmp( ctltalk.errjmp )) exit( 1 ); gCloseOnExec( mstrtalk.pipe ); if (Setjmp( mstrtalk.errjmp )) goto cError; #ifndef NOXDMTITLE setproctitle( "%s'", td->name ); #endif strApp( &prog, " '", (char *)0 ); reInitErrorLog(); setsid(); sessreg( td, getpid(), curuser, curuid ); /* We do this here, as we want to have the session as parent. */ switch (source( systemEnviron, td->startup, td_setup )) { case 0: break; case wcCompose( 0, 0, 127 ): goto cError; default: /* Explicit failure => message already displayed. */ logError( "Startup script returned non-zero exit code\n" ); exit( 1 ); } /* Memory leaks are ok here as we exec() soon. */ #if defined(USE_PAM) || !defined(_AIX) # ifdef USE_PAM /* pass in environment variables set by libpam and modules it called */ # ifdef HAVE_PAM_GETENVLIST pam_env = pam_getenvlist( pamh ); reInitErrorLog(); # endif if (pam_env) for (; *pam_env; pam_env++) userEnviron = putEnv( *pam_env, userEnviron ); # endif # ifdef HAVE_SETLOGIN if (setlogin( curuser ) < 0) { logError( "setlogin for %s failed: %m\n", curuser ); goto cError; } # define D_LOGIN_SETLOGIN LOGIN_SETLOGIN # else # define D_LOGIN_SETLOGIN 0 # endif # if defined(USE_PAM) && defined(HAVE_INITGROUPS) if (!restoreGids()) goto cError; # endif # ifndef HAVE_SETUSERCONTEXT # ifdef USE_PAM if (!setUid( curuser, curuid )) goto cError; # else if (!setUser( curuser, curuid, curgid )) goto cError; # endif # else /* !HAVE_SETUSERCONTEXT */ /* * Destroy environment. * We need to do this before setusercontext() because that may * set or reset some environment variables. */ if (!(environ = initStrArr( 0 ))) goto cError; /* * Set the user's credentials: uid, gid, groups, * environment variables, resource limits, and umask. */ if (setusercontext( lc, p, p->pw_uid, LOGIN_SETALL & ~(D_LOGIN_SETGROUP|D_LOGIN_SETLOGIN) ) < 0) { logError( "setusercontext for %s failed: %m\n", curuser ); goto cError; } for (i = 0; environ[i]; i++) userEnviron = putEnv( environ[i], userEnviron ); # endif /* !HAVE_SETUSERCONTEXT */ #else /* PAM || !_AIX */ /* * Set the user's credentials: uid, gid, groups, * audit classes, user limits, and umask. */ if (setpcred( curuser, NULL ) == -1) { logError( "setpcred for %s failed: %m\n", curuser ); goto cError; } /* * Set the users process environment. Store protected variables and * obtain updated user environment list. This call will initialize * global 'newenv'. */ if (setpenv( curuser, PENV_INIT | PENV_ARGV | PENV_NOEXEC, userEnviron, NULL ) != 0) { logError( "Cannot set %s's process environment\n", curuser ); goto cError; } userEnviron = newenv; #endif /* _AIX */ /* * for user-based authorization schemes, * use the password to get the user's credentials. */ #ifdef SECURE_RPC /* do like "keylogin" program */ if (!curpass[0]) logInfo( "No password for NIS provided.\n" ); else { char netname[MAXNETNAMELEN+1], secretkey[HEXKEYBYTES+1]; int nameret, keyret; int len; int key_set_ok = 0; struct key_netstarg netst; nameret = getnetname( netname ); debug( "user netname: %s\n", netname ); len = strlen( curpass ); if (len > 8) bzero( curpass + 8, len - 8 ); keyret = getsecretkey( netname, secretkey, curpass ); debug( "getsecretkey returns %d, key length %d\n", keyret, strlen( secretkey ) ); netst.st_netname = netname; memcpy( netst.st_priv_key, secretkey, HEXKEYBYTES ); memset( netst.st_pub_key, 0, HEXKEYBYTES ); if (key_setnet( &netst ) < 0) debug( "Could not set secret key.\n" ); /* is there a key, and do we have the right password? */ if (keyret == 1) { if (*secretkey) { keyret = key_setsecret( secretkey ); debug( "key_setsecret returns %d\n", keyret ); if (keyret == -1) logError( "Failed to set NIS secret key\n" ); else key_set_ok = 1; } else { /* found a key, but couldn't interpret it */ logError( "Password incorrect for NIS principal %s\n", nameret ? netname : curuser ); } } if (!key_set_ok) nukeAuth( 9, "SUN-DES-1" ); bzero( secretkey, strlen( secretkey ) ); } #endif #ifdef K5AUTH /* do like "kinit" program */ if (!curpass[0]) logInfo( "No password for Kerberos5 provided.\n" ); else if ((str = krb5Init( curuser, curpass, td->name ))) userEnviron = setEnv( userEnviron, "KRB5CCNAME", str ); else nukeAuth( 14, "MIT-KERBEROS-5" ); #endif /* K5AUTH */ if (td->autoReLogin) { gSet( &mstrtalk ); gSendInt( D_ReLogin ); gSendStr( curuser ); gSendStr( curpass ); gSendStr( newdmrc ); } if (curpass) bzero( curpass, strlen( curpass ) ); setUserAuthorization( td ); home = getEnv( userEnviron, "HOME" ); if (home && chdir( home ) < 0) { logError( "Cannot chdir to %s's home %s: %m\n", curuser, home ); sendStr( V_MSG_ERR, "Cannot enter home directory. Using /.\n" ); chdir( "/" ); userEnviron = setEnv( userEnviron, "HOME", "/" ); home = 0; } if (home || td->clientLogFile[0] == '/') { if (!createClientLog( td->clientLogFile )) { logWarn( "Session log file according to %s cannot be created: %m\n", td->clientLogFile ); goto tmperr; } } else { tmperr: if (!createClientLog( td->clientLogFallback )) logError( "Fallback session log file according to %s cannot be created: %m\n", td->clientLogFallback ); /* Could inform the user, but I guess this is only confusing. */ } if (!*dmrcDir) mergeSessionArgs( home != 0 ); if (!(desksess = iniEntry( curdmrc, "Desktop", "Session", 0 ))) desksess = "failsafe"; /* only due to OOM */ gSet( &mstrtalk ); gSendInt( D_User ); gSendInt( curuid ); gSendStr( curuser ); gSendStr( desksess ); close( mstrtalk.pipe->fd.w ); userEnviron = setEnv( userEnviron, "DESKTOP_SESSION", desksess ); for (i = 0; td->sessionsDirs[i]; i++) { fname = 0; if (strApp( &fname, td->sessionsDirs[i], "/", desksess, ".desktop", (char *)0 )) { if ((str = iniLoad( fname ))) { if (!strCmp( iniEntry( str, "Desktop Entry", "Hidden", 0 ), "true" ) || !(sessargs = iniEntry( str, "Desktop Entry", "Exec", 0 ))) sessargs = ""; free( str ); free( fname ); goto gotit; } free( fname ); } } if (!strcmp( desksess, "failsafe" ) || !strcmp( desksess, "default" ) || !strcmp( desksess, "custom" )) sessargs = desksess; else sessargs = ""; gotit: if (!(argv = parseArgs( (char **)0, td->session )) || !(argv = addStrArr( argv, sessargs, -1 ))) exit( 1 ); if (argv[0] && *argv[0]) { debug( "executing session %\"[s\n", argv ); execute( argv, userEnviron ); logError( "Session %\"s execution failed: %m\n", argv[0] ); } else logError( "Session has no command/arguments\n" ); failsafeArgv[0] = td->failsafeClient; failsafeArgv[1] = 0; execute( failsafeArgv, userEnviron ); logError( "Failsafe client %\"s execution failed: %m\n", failsafeArgv[0] ); cError: sendStr( V_MSG_ERR, 0 ); exit( 1 ); case -1: free( buf ); return 0; } debug( "StartSession, fork succeeded %d\n", *pid ); free( buf ); gSet( &ctltalk ); if (!Setjmp( ctltalk.errjmp )) while (gRecvCmd( &i )) { buf = gRecvStr(); displayStr( i, buf ); free( buf ); gSet( &ctltalk ); gSendInt( 0 ); } gClosen( ctltalk.pipe ); finishGreet(); return 1; }
int Verify (struct display *d, struct greet_info *greet, struct verify_info *verify) { struct passwd *p; login_cap_t *lc; auth_session_t *as; char *style, *shell, *home, *s, **argv; char path[MAXPATHLEN]; int authok; /* User may have specified an authentication style. */ if ((style = strchr(greet->name, ':')) != NULL) *style++ = '\0'; Debug ("Verify %s, style %s ...\n", greet->name, style ? style : "default"); p = getpwnam (greet->name); endpwent(); if (!p || strlen (greet->name) == 0) { Debug("getpwnam() failed.\n"); bzero(greet->password, strlen(greet->password)); return 0; } if ((lc = login_getclass(p->pw_class)) == NULL) { Debug("login_getclass() failed.\n"); bzero(greet->password, strlen(greet->password)); return 0; } if ((style = login_getstyle(lc, style, "xdm")) == NULL) { Debug("login_getstyle() failed.\n"); bzero(greet->password, strlen(greet->password)); return 0; } if ((as = auth_open()) == NULL) { Debug("auth_open() failed.\n"); login_close(lc); bzero(greet->password, strlen(greet->password)); return 0; } if (auth_setoption(as, "login", "yes") == -1) { Debug("auth_setoption() failed.\n"); login_close(lc); bzero(greet->password, strlen(greet->password)); return 0; } /* Set up state for no challenge, just check a response. */ auth_setstate(as, 0); auth_setdata(as, "", 1); auth_setdata(as, greet->password, strlen(greet->password) + 1); /* Build path of the auth script and call it */ snprintf(path, sizeof(path), _PATH_AUTHPROG "%s", style); auth_call(as, path, style, "-s", "response", greet->name, lc->lc_class, (void *)NULL); authok = auth_getstate(as); if ((authok & AUTH_ALLOW) == 0) { Debug("password verify failed\n"); bzero(greet->password, strlen(greet->password)); auth_close(as); login_close(lc); return 0; } /* Run the approval script */ if (!auth_approval(as, lc, greet->name, "auth-xdm")) { Debug("login not approved\n"); bzero(greet->password, strlen(greet->password)); auth_close(as); login_close(lc); return 0; } auth_close(as); login_close(lc); /* Check empty passwords against allowNullPasswd */ if (!greet->allow_null_passwd && strlen(greet->password) == 0) { Debug("empty password not allowed\n"); return 0; } /* Only accept root logins if allowRootLogin resource is set */ if (p->pw_uid == 0 && !greet->allow_root_login) { Debug("root logins not allowed\n"); bzero(greet->password, strlen(greet->password)); return 0; } /* * Shell must be in /etc/shells */ for (;;) { s = getusershell(); if (s == NULL) { /* did not found the shell in /etc/shells -> failure */ Debug("shell not in /etc/shells\n"); bzero(greet->password, strlen(greet->password)); endusershell(); return 0; } if (strcmp(s, p->pw_shell) == 0) { /* found the shell in /etc/shells */ endusershell(); break; } } #else /* !USE_BSDAUTH */ int Verify (struct display *d, struct greet_info *greet, struct verify_info *verify) { struct passwd *p; #ifdef USE_PAM pam_handle_t **pamhp = thepamhp(); #else #ifdef USESHADOW struct spwd *sp; #endif char *user_pass = NULL; #endif #ifdef __OpenBSD__ char *s; struct timeval tp; #endif char *shell, *home; char **argv; Debug ("Verify %s ...\n", greet->name); #if defined(sun) && defined(SVR4) /* Solaris: If CONSOLE is set to /dev/console in /etc/default/login, then root can only login on system console */ # define SOLARIS_LOGIN_DEFAULTS "/etc/default/login" if (strcmp(greet->name, "root") == 0) { char *console = NULL, *tmp = NULL; FILE *fs; if ((fs= fopen(SOLARIS_LOGIN_DEFAULTS, "r")) != NULL) { char str[120]; while (!feof(fs)) { fgets(str, 120, fs); if(str[0] == '#' || strlen(str) < 8) continue; if((tmp = strstr(str, "CONSOLE=")) != NULL) console = strdup((tmp+8)); } fclose(fs); if ( console != NULL && (strncmp(console, "/dev/console", 12) == 0) && (strncmp(d->name,":0",2) != 0) ) { Debug("Not on system console\n"); bzero(greet->password, strlen(greet->password)); XFree(console); return 0; } XFree(console); } else { Debug("Could not open %s\n", SOLARIS_LOGIN_DEFAULTS); } } #endif #ifndef USE_PAM p = getpwnam (greet->name); endpwent(); if (!p || strlen (greet->name) == 0) { Debug ("getpwnam() failed.\n"); bzero(greet->password, strlen(greet->password)); return 0; } else { #ifdef linux if (!strcmp(p->pw_passwd, "!") || !strcmp(p->pw_passwd, "*")) { Debug ("The account is locked, no login allowed.\n"); bzero(greet->password, strlen(greet->password)); return 0; } #endif user_pass = p->pw_passwd; } #endif #ifdef KERBEROS if(strcmp(greet->name, "root") != 0){ char name[ANAME_SZ]; char realm[REALM_SZ]; char *q; int ret; if(krb_get_lrealm(realm, 1)){ Debug ("Can't get Kerberos realm.\n"); } else { sprintf(krbtkfile, "%s.%s", TKT_ROOT, d->name); krb_set_tkt_string(krbtkfile); unlink(krbtkfile); ret = krb_verify_user(greet->name, "", realm, greet->password, 1, "rcmd"); if(ret == KSUCCESS){ chown(krbtkfile, p->pw_uid, p->pw_gid); Debug("kerberos verify succeeded\n"); if (k_hasafs()) { if (k_setpag() == -1) LogError ("setpag() failed for %s\n", greet->name); if((ret = k_afsklog(NULL, NULL)) != KSUCCESS) LogError("Warning %s\n", krb_get_err_text(ret)); } goto done; } else if(ret != KDC_PR_UNKNOWN && ret != SKDC_CANT){ /* failure */ Debug("kerberos verify failure %d\n", ret); krbtkfile[0] = '\0'; } } } #endif #ifndef USE_PAM #ifdef USESHADOW errno = 0; sp = getspnam(greet->name); if (sp == NULL) { Debug ("getspnam() failed, errno=%d. Are you root?\n", errno); } else { user_pass = sp->sp_pwdp; } #ifndef QNX4 endspent(); #endif /* QNX4 doesn't need endspent() to end shadow passwd ops */ #endif #if defined(ultrix) || defined(__ultrix__) if (authenticate_user(p, greet->password, NULL) < 0) #else if (strcmp (crypt (greet->password, user_pass), user_pass)) #endif { if(!greet->allow_null_passwd || strlen(p->pw_passwd) > 0) { Debug ("password verify failed\n"); bzero(greet->password, strlen(greet->password)); return 0; } /* else: null passwd okay */ } #ifdef KERBEROS done: #endif #ifdef __OpenBSD__ /* * Only accept root logins if allowRootLogin resource is set */ if ((p->pw_uid == 0) && !greet->allow_root_login) { Debug("root logins not allowed\n"); bzero(greet->password, strlen(greet->password)); return 0; } /* * Shell must be in /etc/shells */ for (;;) { s = getusershell(); if (s == NULL) { /* did not found the shell in /etc/shells -> failure */ Debug("shell not in /etc/shells\n"); bzero(greet->password, strlen(greet->password)); endusershell(); return 0; } if (strcmp(s, p->pw_shell) == 0) { /* found the shell in /etc/shells */ endusershell(); break; } } /* * Test for expired password */ if (p->pw_change || p->pw_expire) (void)gettimeofday(&tp, (struct timezone *)NULL); if (p->pw_change) { if (tp.tv_sec >= p->pw_change) { Debug("Password has expired.\n"); bzero(greet->password, strlen(greet->password)); return 0; } } if (p->pw_expire) { if (tp.tv_sec >= p->pw_expire) { Debug("account has expired.\n"); bzero(greet->password, strlen(greet->password)); return 0; } } #endif /* __OpenBSD__ */ bzero(user_pass, strlen(user_pass)); /* in case shadow password */ #else /* USE_PAM */ #define PAM_BAIL \ if (pam_error != PAM_SUCCESS) goto pam_failed; PAM_password = greet->password; pam_error = pam_start("xdm", greet->name, &PAM_conversation, pamhp); PAM_BAIL; pam_error = pam_set_item(*pamhp, PAM_TTY, d->name); PAM_BAIL; pam_error = pam_set_item(*pamhp, PAM_RHOST, ""); PAM_BAIL; pam_error = pam_authenticate(*pamhp, 0); PAM_BAIL; pam_error = pam_acct_mgmt(*pamhp, 0); /* really should do password changing, but it doesn't fit well */ PAM_BAIL; pam_error = pam_setcred(*pamhp, 0); PAM_BAIL; p = getpwnam (greet->name); endpwent(); if (!p || strlen (greet->name) == 0) { Debug ("getpwnam() failed.\n"); bzero(greet->password, strlen(greet->password)); return 0; } if (pam_error != PAM_SUCCESS) { pam_failed: pam_end(*pamhp, PAM_SUCCESS); *pamhp = NULL; return 0; } #undef PAM_BAIL #endif /* USE_PAM */ #endif /* USE_BSDAUTH */ Debug ("verify succeeded\n"); /* The password is passed to StartClient() for use by user-based authorization schemes. It is zeroed there. */ verify->uid = p->pw_uid; verify->gid = p->pw_gid; home = p->pw_dir; shell = p->pw_shell; argv = 0; if (d->session) argv = parseArgs (argv, d->session); if (greet->string) argv = parseArgs (argv, greet->string); if (!argv) argv = parseArgs (argv, "xsession"); verify->argv = argv; verify->userEnviron = userEnv (d, p->pw_uid == 0, greet->name, home, shell); Debug ("user environment:\n"); printEnv (verify->userEnviron); verify->systemEnviron = systemEnv (d, greet->name, home); Debug ("system environment:\n"); printEnv (verify->systemEnviron); Debug ("end of environments\n"); return 1; }