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Diffstat (limited to 'source3/smbd/password.c')
| -rw-r--r-- | source3/smbd/password.c | 1416 |
1 files changed, 1416 insertions, 0 deletions
diff --git a/source3/smbd/password.c b/source3/smbd/password.c new file mode 100644 index 0000000000..87c1fef94c --- /dev/null +++ b/source3/smbd/password.c @@ -0,0 +1,1416 @@ +/* + Unix SMB/Netbios implementation. + Version 1.9. + Password and authentication handling + Copyright (C) Andrew Tridgell 1992-1995 + + 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" +#include "loadparm.h" + +extern int DEBUGLEVEL; +extern int Protocol; + +/* users from session setup */ +static pstring session_users=""; + +/* these are kept here to keep the string_combinations function simple */ +static char this_user[100]=""; +static char this_salt[100]=""; +static char this_crypted[100]=""; + +#ifdef SMB_PASSWD +/* Data to do lanman1/2 password challenge. */ +static unsigned char saved_challenge[8]; +static BOOL challenge_sent=False; + +/******************************************************************* +Get the next challenge value - no repeats. +********************************************************************/ +void generate_next_challenge(char *challenge) +{ + extern void E1(char *,char *,char *); + static int counter = 0; + struct timeval tval; + int v1,v2; + GetTimeOfDay(&tval); + v1 = (counter++) + getpid() + tval.tv_sec; + v2 = (counter++) * getpid() + tval.tv_usec; + SIVAL(challenge,0,v1); + SIVAL(challenge,4,v2); + E1(challenge,"SAMBA",saved_challenge); + memcpy(challenge,saved_challenge,8); + challenge_sent = True; +} + +/******************************************************************* +set the last challenge sent, usually from a password server +********************************************************************/ +BOOL set_challenge(char *challenge) +{ + memcpy(saved_challenge,challenge,8); + challenge_sent = True; + return(True); +} + +/******************************************************************* +get the last challenge sent +********************************************************************/ +BOOL last_challenge(char *challenge) +{ + if (!challenge_sent) return(False); + memcpy(challenge,saved_challenge,8); + return(True); +} +#endif + +/* this holds info on user ids that are already validated for this VC */ +static user_struct *validated_users = NULL; +static int num_validated_users = 0; + +/**************************************************************************** +check if a uid has been validated, and return an index if it has. -1 if not +****************************************************************************/ +int valid_uid(int uid) +{ + int i; + if (uid == -1) return(-1); + + for (i=0;i<num_validated_users;i++) + if (validated_users[i].uid == uid) + { + DEBUG(3,("valid uid %d mapped to vuid %d (user=%s)\n", + uid,i,validated_users[i].name)); + return(i); + } + return(-1); +} + +/**************************************************************************** +check if a uid has been validated, and return an pointer to the user_struct +if it has. NULL if not +****************************************************************************/ +user_struct *get_valid_user_struct(int uid) +{ + int vuid = valid_uid(uid); + if(vuid == -1 || validated_users[vuid].guest) + return NULL; + return &validated_users[vuid]; +} + +/**************************************************************************** +invalidate a uid +****************************************************************************/ +void invalidate_uid(int uid) +{ + int i; + for (i=0;i<num_validated_users;i++) + if (validated_users[i].uid == uid) + { + user_struct *vuser = &validated_users[i]; + vuser->uid = -1; + vuser->gid = -1; + vuser->user_ngroups = 0; + if(vuser->user_groups && + (vuser->user_groups != (gid_t *)vuser->user_igroups)) + free(vuser->user_groups); + vuser->user_groups = NULL; + if(vuser->user_igroups) + free(vuser->user_igroups); + vuser->user_igroups = NULL; + } +} + + +/**************************************************************************** +return a validated username +****************************************************************************/ +char *validated_username(int vuid) +{ + return(validated_users[vuid].name); +} + +/**************************************************************************** +register a uid/name pair as being valid and that a valid password +has been given. +****************************************************************************/ +void register_uid(int uid,int gid, char *name,BOOL guest) +{ + user_struct *vuser; + + if (valid_uid(uid) >= 0) + return; + validated_users = (user_struct *)Realloc(validated_users, + sizeof(user_struct)* + (num_validated_users+1)); + + if (!validated_users) + { + DEBUG(0,("Failed to realloc users struct!\n")); + return; + } + + vuser = &validated_users[num_validated_users]; + vuser->uid = uid; + vuser->gid = gid; + vuser->guest = guest; + strcpy(vuser->name,name); + + vuser->user_ngroups = 0; + vuser->user_groups = NULL; + vuser->user_igroups = NULL; + + /* Find all the groups this uid is in and store them. + Used by become_user() */ + setup_groups(name,uid,gid, + &vuser->user_ngroups, + &vuser->user_igroups, + &vuser->user_groups); + + DEBUG(3,("uid %d registered to name %s\n",uid,name)); + + num_validated_users++; +} + + +/**************************************************************************** +add a name to the session users list +****************************************************************************/ +void add_session_user(char *user) +{ + fstring suser; + StrnCpy(suser,user,sizeof(suser)-1); + + if (!Get_Pwnam(suser,True)) return; + + if (suser && *suser && !in_list(suser,session_users,False)) + { + if (strlen(suser) + strlen(session_users) + 2 >= sizeof(pstring)) + DEBUG(1,("Too many session users??\n")); + else + { + strcat(session_users," "); + strcat(session_users,suser); + } + } +} + + +#ifdef NO_GETSPNAM +/* a fake shadow password routine which just fills a fake spwd struct + * with the sp_pwdp field. (sreiz@aie.nl) + */ +static struct spwd *getspnam(char *username) /* fake shadow password routine */ +{ + FILE *f; + char line[1024]; + static char pw[20]; + static struct spwd static_spwd; + + static_spwd.sp_pwdp=0; + if (!(f=fopen("/etc/master.passwd", "r"))) + return 0; + while (fgets(line, 1024, f)) { + if (!strncmp(line, username, strlen(username)) && + line[strlen(username)]==':') { /* found entry */ + char *p, *q; + + p=line+strlen(username)+1; + if ((q=strchr(p, ':'))) { + *q=0; + if (q-p+1>20) + break; + strcpy(pw, p); + static_spwd.sp_pwdp=pw; + } + break; + } + } + fclose(f); + if (static_spwd.sp_pwdp) + return &static_spwd; + return 0; +} +#endif + + +#ifdef OSF1_ENH_SEC +/**************************************************************************** +an enhanced crypt for OSF1 +****************************************************************************/ +static char *osf1_bigcrypt(char *password,char *salt1) +{ + static char result[AUTH_MAX_PASSWD_LENGTH] = ""; + char *p1; + char *p2=password; + char salt[3]; + int i; + int parts = strlen(password) / AUTH_CLEARTEXT_SEG_CHARS; + if (strlen(password)%AUTH_CLEARTEXT_SEG_CHARS) + parts++; + + StrnCpy(salt,salt1,2); + StrnCpy(result,salt1,2); + + for (i=0; i<parts;i++) + { + p1 = crypt(p2,salt); + strcat(result,p1+2); + StrnCpy(salt,&result[2+i*AUTH_CIPHERTEXT_SEG_CHARS],2); + p2 += AUTH_CLEARTEXT_SEG_CHARS; + } + + return(result); +} +#endif + + +/**************************************************************************** +update the enhanced security database. Only relevant for OSF1 at the moment. +****************************************************************************/ +static void update_protected_database( char *user, BOOL result) +{ +#ifdef OSF1_ENH_SEC + struct pr_passwd *mypasswd; + time_t starttime; + long tz; + + mypasswd = getprpwnam (user); + starttime = time (NULL); + tz = mktime ( localtime ( &starttime ) ); + + if (result) + { + mypasswd->ufld.fd_slogin = tz; + mypasswd->ufld.fd_nlogins = 0; + + putprpwnam(user,mypasswd); + + DEBUG(3,("Update protected database for Account %s after succesful connection\n",user)); + } + else + { + mypasswd->ufld.fd_ulogin = tz; + mypasswd->ufld.fd_nlogins = mypasswd->ufld.fd_nlogins + 1; + if ( mypasswd->ufld.fd_max_tries != 0 && mypasswd->ufld.fd_nlogins > mypasswd->ufld.fd_max_tries ) + { + mypasswd->uflg.fg_lock = 0; + DEBUG(3,("Account is disabled -- see Account Administrator.\n")); + } + putprpwnam ( user , mypasswd ); + DEBUG(3,("Update protected database for Account %s after refusing connection\n",user)); + } +#else + DEBUG(6,("Updated database with %s %s\n",user,BOOLSTR(result))); +#endif +} + + +#ifdef AFS_AUTH +/******************************************************************* +check on AFS authentication +********************************************************************/ +static BOOL afs_auth(char *this_user,char *password) +{ + long password_expires = 0; + char *reason; + + /* For versions of AFS prior to 3.3, this routine has few arguments, */ + /* but since I can't find the old documentation... :-) */ + setpag(); + if (ka_UserAuthenticateGeneral(KA_USERAUTH_VERSION+KA_USERAUTH_DOSETPAG, + this_user, + (char *) 0, /* instance */ + (char *) 0, /* cell */ + password, + 0, /* lifetime, default */ + &password_expires, /*days 'til it expires */ + 0, /* spare 2 */ + &reason) == 0) + return(True); + return(False); +} +#endif + + +#ifdef DFS_AUTH + +sec_login_handle_t my_dce_sec_context; +int dcelogin_atmost_once = 0; + +/******************************************************************* +check on a DCE/DFS authentication +********************************************************************/ +static BOOL dfs_auth(char *this_user,char *password) +{ + error_status_t err; + int err2; + int prterr; + boolean32 password_reset; + sec_passwd_rec_t my_dce_password; + sec_login_auth_src_t auth_src = sec_login_auth_src_network; + unsigned char dce_errstr[dce_c_error_string_len]; + + /* + * We only go for a DCE login context if the given password + * matches that stored in the local password file.. + * Assumes local passwd file is kept in sync w/ DCE RGY! + */ + + if (!strcmp((char *)crypt(password,this_salt),this_crypted) || + dcelogin_atmost_once) + return(False); + + if (sec_login_setup_identity( + (unsigned char *)this_user, + sec_login_no_flags, + &my_dce_sec_context, + &err) == 0) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0,("DCE Setup Identity for %s failed: %s\n", + this_user,dce_errstr)); + return(False); + } + + my_dce_password.version_number = sec_passwd_c_version_none; + my_dce_password.pepper = NULL; + my_dce_password.key.key_type = sec_passwd_plain; + my_dce_password.key.tagged_union.plain = (idl_char *)password; + + if (sec_login_valid_and_cert_ident(my_dce_sec_context, + &my_dce_password, + &password_reset, + &auth_src, + &err) == 0 ) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0,("DCE Identity Validation failed for principal %s: %s\n", + this_user,dce_errstr)); + + return(False); + } + + sec_login_set_context(my_dce_sec_context, &err); + if (err != error_status_ok ) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0,("DCE login failed for principal %s, cant set context: %s\n", + this_user,dce_errstr)); + sec_login_purge_context(my_dce_sec_context, &err); + return(False); + } + else + { + DEBUG(0,("DCE login succeeded for principal %s on pid %d\n", + this_user, getpid())); + } + + dcelogin_atmost_once = 1; + return (True); +} + +void dfs_unlogin(void) +{ + error_status_t err; + int err2; + unsigned char dce_errstr[dce_c_error_string_len]; + + sec_login_purge_context(my_dce_sec_context, &err); + if (err != error_status_ok ) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0,("DCE purge login context failed for server instance %d: %s\n", + getpid(), dce_errstr)); + } +} + +#endif + + +#ifdef LINUX_BIGCRYPT +/**************************************************************************** +an enhanced crypt for Linux to handle password longer than 8 characters +****************************************************************************/ +static int linux_bigcrypt(char *password,char *salt1, char *crypted) +{ +#define LINUX_PASSWORD_SEG_CHARS 8 + char salt[3]; + int i; + + StrnCpy(salt,salt1,2); + crypted +=2; + + for ( i=strlen(password); i > 0; i -= LINUX_PASSWORD_SEG_CHARS) { + char * p = crypt(password,salt) + 2; + if(strncmp(p, crypted, LINUX_PASSWORD_SEG_CHARS) != 0) + return(0); + password += LINUX_PASSWORD_SEG_CHARS; + crypted += strlen(p); + } + + return(1); +} +#endif + + +/**************************************************************************** +apply a function to upper/lower case combinations +of a string and return true if one of them returns true. +try all combinations with N uppercase letters. +offset is the first char to try and change (start with 0) +it assumes the string starts lowercased +****************************************************************************/ +static BOOL string_combinations2(char *s,int offset,BOOL (*fn)(),int N) +{ + int len = strlen(s); + int i; + +#ifdef PASSWORD_LENGTH + len = MIN(len,PASSWORD_LENGTH); +#endif + + if (N <= 0 || offset >= len) + return(fn(s)); + + for (i=offset;i<(len-(N-1));i++) + { + char c = s[i]; + if (!islower(c)) continue; + s[i] = toupper(c); + if (string_combinations2(s,i+1,fn,N-1)) + return(True); + s[i] = c; + } + return(False); +} + +/**************************************************************************** +apply a function to upper/lower case combinations +of a string and return true if one of them returns true. +try all combinations with up to N uppercase letters. +offset is the first char to try and change (start with 0) +it assumes the string starts lowercased +****************************************************************************/ +static BOOL string_combinations(char *s,BOOL (*fn)(),int N) +{ + int n; + for (n=1;n<=N;n++) + if (string_combinations2(s,0,fn,n)) return(True); + return(False); +} + + + +/**************************************************************************** +core of password checking routine +****************************************************************************/ +BOOL password_check(char *password) +{ +#ifdef AFS_AUTH + if (afs_auth(this_user,password)) return(True); +#endif + +#ifdef DFS_AUTH + if (dfs_auth(this_user,password)) return(True); +#endif + +#ifdef PWDAUTH + if (pwdauth(this_user,password) == 0) + return(True); +#endif + +#ifdef OSF1_ENH_SEC + return(strcmp(osf1_bigcrypt(password,this_salt),this_crypted) == 0); +#endif + +#ifdef ULTRIX_AUTH + return (strcmp((char *)crypt16(password, this_salt ),this_crypted) == 0); +#endif + +#ifdef LINUX_BIGCRYPT + return(linux_bigcrypt(password,this_salt,this_crypted)); +#endif + +#ifdef NO_CRYPT + DEBUG(1,("Warning - no crypt available\n")); + return(False); +#else + return(strcmp((char *)crypt(password,this_salt),this_crypted) == 0); +#endif +} + +#ifdef SMB_PASSWD +/**************************************************************************** +core of smb password checking routine. +****************************************************************************/ +BOOL smb_password_check(char *password, unsigned char *part_passwd, unsigned char *c8) +{ + /* Finish the encryption of part_passwd. */ + unsigned char p21[21]; + unsigned char p24[24]; + + if(part_passwd == NULL) + DEBUG(10,("No password set - allowing access\n")); + /* No password set - always true ! */ + if(part_passwd == NULL) + return 1; + + memset(p21,'\0',21); + memcpy(p21,part_passwd,16); + E_P24(p21, c8, p24); +#if DEBUG_PASSWORD + { + int i; + DEBUG(100,("Part password (P16) was |")); + for(i = 0; i < 16; i++) + DEBUG(100,("%X ", (unsigned char)part_passwd[i])); + DEBUG(100,("|\n")); + DEBUG(100,("Password from client was |")); + for(i = 0; i < 24; i++) + DEBUG(100,("%X ", (unsigned char)password[i])); + DEBUG(100,("|\n")); + DEBUG(100,("Given challenge was |")); + for(i = 0; i < 8; i++) + DEBUG(100,("%X ", (unsigned char)c8[i])); + DEBUG(100,("|\n")); + DEBUG(100,("Value from encryption was |")); + for(i = 0; i < 24; i++) + DEBUG(100,("%X ", (unsigned char)p24[i])); + DEBUG(100,("|\n")); + } +#endif + return (memcmp(p24, password, 24) == 0); +} +#endif + +/**************************************************************************** +check if a username/password is OK +****************************************************************************/ +BOOL password_ok(char *user,char *password, int pwlen, struct passwd *pwd, BOOL is_nt_password) +{ + pstring pass2; + int level = lp_passwordlevel(); + struct passwd *pass; +#ifdef SMB_PASSWD + char challenge[8]; + struct smb_passwd *smb_pass; + BOOL challenge_done = False; +#endif + + if (password) password[pwlen] = 0; + +#ifdef SMB_PASSWD + if (pwlen == 24) + challenge_done = last_challenge(challenge); +#endif + +#if DEBUG_PASSWORD +#ifdef SMB_PASSWD + if (challenge_done) + { + int i; + DEBUG(100,("checking user=[%s] pass=[",user)); + for( i = 0; i < 24; i++) + DEBUG(100,("%0x ", (unsigned char)password[i])); + DEBUG(100,("]\n")); + } + else +#endif + DEBUG(100,("checking user=[%s] pass=[%s]\n",user,password)); +#endif + + if (!password) + return(False); + + if (((!*password) || (!pwlen)) && !lp_null_passwords()) + return(False); + + if (pwd && !user) + { + pass = (struct passwd *) pwd; + user = pass->pw_name; + } + else + pass = Get_Pwnam(user,True); + +#ifdef SMB_PASSWD + + DEBUG(4,("SMB Password - pwlen = %d, challenge_done = %d\n", pwlen, challenge_done)); + + if((pwlen == 24) && challenge_done) + { + DEBUG(4,("Checking SMB password for user %s (l=24)\n",user)); + + if (!pass) + { + DEBUG(3,("Couldn't find user %s\n",user)); + return(False); + } + + smb_pass = get_smbpwnam(user); + if(!smb_pass) + { + DEBUG(3,("Couldn't find user %s in smb_passwd file.\n", user)); + return(False); + } + + /* Ensure the uid's match */ + if(smb_pass->smb_userid != pass->pw_uid) + { + DEBUG(3,("Error : UNIX and SMB uids in password files do not match !\n")); + return(False); + } + + if(Protocol >= PROTOCOL_NT1 && is_nt_password) + { + /* We have the NT MD4 hash challenge available - see if we can + use it (ie. does it exist in the smbpasswd file). + */ + if(smb_pass->smb_nt_passwd != NULL) + { + DEBUG(4,("Checking NT MD4 password\n")); + if(smb_password_check(password, smb_pass->smb_nt_passwd, challenge)) + { + update_protected_database(user,True); + return(True); + } + DEBUG(4,("NT MD4 password check failed\n")); + return (False); + } + } + + /* Try against the lanman password */ + + if(smb_password_check(password, smb_pass->smb_passwd, challenge)) + { + update_protected_database(user,True); + return(True); + } + + DEBUG(3,("Error smb_password_check failed\n")); + } +#endif + + DEBUG(4,("Checking password for user %s (l=%d)\n",user,pwlen)); + + if (!pass) + { + DEBUG(3,("Couldn't find user %s\n",user)); + return(False); + } + +#ifdef SHADOW_PWD + { + struct spwd *spass; + + /* many shadow systems require you to be root to get the password, + in most cases this should already be the case when this + function is called, except perhaps for IPC password changing + requests */ + + spass = getspnam(pass->pw_name); + if (spass && spass->sp_pwdp) + pass->pw_passwd = spass->sp_pwdp; + } +#endif + +#ifdef SecureWare + { + struct pr_passwd *pr_pw = getprpwnam(pass->pw_name); + if (pr_pw && pr_pw->ufld.fd_encrypt) + pass->pw_passwd = pr_pw->ufld.fd_encrypt; + } +#endif + +#ifdef HPUX_10_TRUSTED + { + struct pr_passwd *pr_pw = getprpwnam(pass->pw_name); + if (pr_pw && pr_pw->ufld.fd_encrypt) + pass->pw_passwd = pr_pw->ufld.fd_encrypt; + } +#endif + +#ifdef OSF1_ENH_SEC + { + struct pr_passwd *mypasswd; + DEBUG(5,("Checking password for user %s in OSF1_ENH_SEC\n",user)); + mypasswd = getprpwnam (user); + if ( mypasswd ) + { + strcpy(pass->pw_name,mypasswd->ufld.fd_name); + strcpy(pass->pw_passwd,mypasswd->ufld.fd_encrypt); + } + else + { + DEBUG(5,("No entry for user %s in protected database !\n",user)); + return(False); + } + } +#endif + +#ifdef ULTRIX_AUTH + { + AUTHORIZATION *ap = getauthuid( pass->pw_uid ); + if (ap) + { + strcpy( pass->pw_passwd, ap->a_password ); + endauthent(); + } + } +#endif + + /* extract relevant info */ + strcpy(this_user,pass->pw_name); + strcpy(this_salt,pass->pw_passwd); + strcpy(this_crypted,pass->pw_passwd); + + if (!*this_crypted) { + if (!lp_null_passwords()) { + DEBUG(2,("Disallowing access to %s due to null password\n",this_user)); + return(False); + } +#ifndef PWDAUTH + if (!*password) { + DEBUG(3,("Allowing access to %s with null password\n",this_user)); + return(True); + } +#endif + } + + /* try it as it came to us */ + if (password_check(password)) + { + update_protected_database(user,True); + return(True); + } + + /* if the password was given to us with mixed case then we don't + need to proceed as we know it hasn't been case modified by the + client */ + if (strhasupper(password) && strhaslower(password)) + return(False); + + /* make a copy of it */ + StrnCpy(pass2,password,sizeof(pstring)-1); + + /* try all lowercase */ + strlower(password); + if (password_check(password)) + { + update_protected_database(user,True); + return(True); + } + + /* give up? */ + if(level < 1) + { + update_protected_database(user,False); + + /* restore it */ + strcpy(password,pass2); + + return(False); + } + + /* last chance - all combinations of up to level chars upper! */ + strlower(password); + + if (string_combinations(password,password_check,level)) + { + update_protected_database(user,True); + return(True); + } + + update_protected_database(user,False); + + /* restore it */ + strcpy(password,pass2); + + return(False); +} + + + +/**************************************************************************** +check if a username is valid +****************************************************************************/ +BOOL user_ok(char *user,int snum) +{ + pstring valid, invalid; + BOOL ret; + + StrnCpy(valid, lp_valid_users(snum), sizeof(pstring)); + StrnCpy(invalid, lp_invalid_users(snum), sizeof(pstring)); + + string_sub(valid,"%S",lp_servicename(snum)); + string_sub(invalid,"%S",lp_servicename(snum)); + + ret = !user_in_list(user,invalid); + + if (ret && valid && *valid) + ret = user_in_list(user,valid); + + if (ret && lp_onlyuser(snum)) { + char *user_list = lp_username(snum); + string_sub(user_list,"%S",lp_servicename(snum)); + ret = user_in_list(user,user_list); + } + + return(ret); +} + + + + +/**************************************************************************** +validate a group username entry. Return the username or NULL +****************************************************************************/ +static char *validate_group(char *group,char *password,int pwlen,int snum) +{ +#ifdef NETGROUP + { + char *host, *user, *domain; + setnetgrent(group); + while (getnetgrent(&host, &user, &domain)) { + if (user) { + if (user_ok(user, snum) && + password_ok(user,password,pwlen,NULL,False)) { + endnetgrent(); + return(user); + } + } + } + endnetgrent(); + } +#endif + +#if HAVE_GETGRNAM + { + struct group *gptr = (struct group *)getgrnam(group); + char **member; + if (gptr) + { + member = gptr->gr_mem; + while (member && *member) + { + static fstring name; + strcpy(name,*member); + if (user_ok(name,snum) && + password_ok(name,password,pwlen,NULL,False)) + return(&name[0]); + member++; + } +#ifdef GROUP_CHECK_PWENT + { + struct passwd *pwd; + static fstring tm; + + setpwent (); + while (pwd = getpwent ()) { + if (*(pwd->pw_passwd) && pwd->pw_gid == gptr->gr_gid) { + /* This Entry have PASSWORD and same GID then check pwd */ + if (password_ok(NULL, password, pwlen, pwd,False)) { + strcpy(tm, pwd->pw_name); + endpwent (); + return tm; + } + } + } + endpwent (); + } +#endif /* GROUP_CHECK_PWENT */ + } + } +#endif + return(NULL); +} + + + +/**************************************************************************** +check for authority to login to a service with a given username/password +****************************************************************************/ +BOOL authorise_login(int snum,char *user,char *password, int pwlen, + BOOL *guest,BOOL *force,int vuid) +{ + BOOL ok = False; + + *guest = False; + +#if DEBUG_PASSWORD + DEBUG(100,("checking authorisation on user=%s pass=%s\n",user,password)); +#endif + + /* there are several possabilities: + 1) login as the given user with given password + 2) login as a previously registered username with the given password + 3) login as a session list username with the given password + 4) login as a previously validated user/password pair + 5) login as the "user =" user with given password + 6) login as the "user =" user with no password (guest connection) + 7) login as guest user with no password + + if the service is guest_only then steps 1 to 5 are skipped + */ + + if (GUEST_ONLY(snum)) *force = True; + + if (!(GUEST_ONLY(snum) && GUEST_OK(snum))) + { + + /* check the given username and password */ + if (!ok && (*user) && user_ok(user,snum)) { + ok = password_ok(user,password, pwlen, NULL, False); + if (ok) DEBUG(3,("ACCEPTED: given username password ok\n")); + } + + /* check for a previously registered guest username */ + if (!ok && (vuid >= 0) && validated_users[vuid].guest) { + if (user_ok(validated_users[vuid].name,snum) && + password_ok(validated_users[vuid].name, password, pwlen, NULL, False)) { + strcpy(user, validated_users[vuid].name); + validated_users[vuid].guest = False; + DEBUG(3,("ACCEPTED: given password with registered user %s\n", user)); + ok = True; + } + } + + + /* now check the list of session users */ + if (!ok) + { + char *auser; + char *user_list = strdup(session_users); + if (!user_list) return(False); + + for (auser=strtok(user_list,LIST_SEP); + !ok && auser; + auser = strtok(NULL,LIST_SEP)) + { + fstring user2; + strcpy(user2,auser); + if (!user_ok(user2,snum)) continue; + + if (password_ok(user2,password, pwlen, NULL, False)) { + ok = True; + strcpy(user,user2); + DEBUG(3,("ACCEPTED: session list username and given password ok\n")); + } + } + free(user_list); + } + + /* check for a previously validated username/password pair */ + if (!ok && !lp_revalidate(snum) && + (vuid >= 0) && !validated_users[vuid].guest && + user_ok(validated_users[vuid].name,snum)) { + strcpy(user,validated_users[vuid].name); + *guest = False; + DEBUG(3,("ACCEPTED: validated uid ok as non-guest\n")); + ok = True; + } + + /* check for a rhosts entry */ + if (!ok && user_ok(user,snum) && check_hosts_equiv(user)) { + ok = True; + DEBUG(3,("ACCEPTED: hosts equiv or rhosts entry\n")); + } + + /* check the user= fields and the given password */ + if (!ok && lp_username(snum)) { + char *auser; + pstring user_list; + StrnCpy(user_list,lp_username(snum),sizeof(pstring)); + + string_sub(user_list,"%S",lp_servicename(snum)); + + for (auser=strtok(user_list,LIST_SEP); + auser && !ok; + auser = strtok(NULL,LIST_SEP)) + { + if (*auser == '@') + { + auser = validate_group(auser+1,password,pwlen,snum); + if (auser) + { + ok = True; + strcpy(user,auser); + DEBUG(3,("ACCEPTED: group username and given password ok\n")); + } + } + else + { + fstring user2; + strcpy(user2,auser); + if (user_ok(user2,snum) && + password_ok(user2,password,pwlen,NULL, False)) + { + ok = True; + strcpy(user,user2); + DEBUG(3,("ACCEPTED: user list username and given password ok\n")); + } + } + } + } + } /* not guest only */ + + /* check for a normal guest connection */ + if (!ok && GUEST_OK(snum)) + { + fstring guestname; + StrnCpy(guestname,lp_guestaccount(snum),sizeof(guestname)-1); + if (Get_Pwnam(guestname,True)) + { + strcpy(user,guestname); + ok = True; + DEBUG(3,("ACCEPTED: guest account and guest ok\n")); + } + else + DEBUG(0,("Invalid guest account %s??\n",guestname)); + *guest = True; + *force = True; + } + + if (ok && !user_ok(user,snum)) + { + DEBUG(0,("rejected invalid user %s\n",user)); + ok = False; + } + + return(ok); +} + + +/**************************************************************************** +read the a hosts.equiv or .rhosts file and check if it +allows this user from this machine +****************************************************************************/ +static BOOL check_user_equiv(char *user, char *remote, char *equiv_file) +{ + pstring buf; + int plus_allowed = 1; + char *file_host; + char *file_user; + FILE *fp = fopen(equiv_file, "r"); + DEBUG(5, ("check_user_equiv %s %s %s\n", user, remote, equiv_file)); + if (! fp) return False; + while(fgets(buf, sizeof(buf), fp)) + { + trim_string(buf," "," "); + + if (buf[0] != '#' && buf[0] != '\n') + { + BOOL is_group = False; + int plus = 1; + char *bp = buf; + if (strcmp(buf, "NO_PLUS\n") == 0) + { + DEBUG(6, ("check_user_equiv NO_PLUS\n")); + plus_allowed = 0; + } + else { + if (buf[0] == '+') + { + bp++; + if (*bp == '\n' && plus_allowed) + { + /* a bare plus means everbody allowed */ + DEBUG(6, ("check_user_equiv everybody allowed\n")); + fclose(fp); + return True; + } + } + else if (buf[0] == '-') + { + bp++; + plus = 0; + } + if (*bp == '@') + { + is_group = True; + bp++; + } + file_host = strtok(bp, " \t\n"); + file_user = strtok(NULL, " \t\n"); + DEBUG(7, ("check_user_equiv %s %s\n", file_host, file_user)); + if (file_host && *file_host) + { + BOOL host_ok = False; + +#ifdef NETGROUP + /* THIS IS UNTESTED!! */ + if (is_group) + { + static char *mydomain = NULL; + if (!mydomain) + yp_get_default_domain(&mydomain); + if (mydomain && innetgr(remote,file_host,user,mydomain)) + host_ok = True; + } +#else + if (is_group) + { + DEBUG(1,("Netgroups not configured - add -DNETGROUP and recompile\n")); + continue; + } +#endif + + /* is it this host */ + /* the fact that remote has come from a call of gethostbyaddr + * means that it may have the fully qualified domain name + * so we could look up the file version to get it into + * a canonical form, but I would rather just type it + * in full in the equiv file + */ + if (!host_ok && !is_group && strequal(remote, file_host)) + host_ok = True; + + if (!host_ok) + continue; + + /* is it this user */ + if (file_user == 0 || strequal(user, file_user)) + { + fclose(fp); + DEBUG(5, ("check_user_equiv matched %s%s %s\n", + (plus ? "+" : "-"), file_host, + (file_user ? file_user : ""))); + return (plus ? True : False); + } + } + } + } + } + fclose(fp); + return False; +} + + +/**************************************************************************** +check for a possible hosts equiv or rhosts entry for the user +****************************************************************************/ +BOOL check_hosts_equiv(char *user) +{ + char *fname = NULL; + pstring rhostsfile; + struct passwd *pass = Get_Pwnam(user,True); + + extern struct from_host Client_info; + extern int Client; + + if (!pass) + return(False); + + fromhost(Client,&Client_info); + + fname = lp_hosts_equiv(); + + /* note: don't allow hosts.equiv on root */ + if (fname && *fname && (pass->pw_uid != 0)) + { + if (check_user_equiv(user,Client_info.name,fname)) + return(True); + } + + if (lp_use_rhosts()) + { + char *home = get_home_dir(user); + if (home) + { + sprintf(rhostsfile, "%s/.rhosts", home); + if (check_user_equiv(user,Client_info.name,rhostsfile)) + return(True); + } + } + + return(False); +} + + +static int password_client = -1; +static fstring pserver; + +/**************************************************************************** +attempted support for server level security +****************************************************************************/ +BOOL server_cryptkey(char *buf) +{ + pstring inbuf,outbuf; + fstring pass_protocol; + extern fstring remote_machine; + char *p; + int len; + fstring desthost; + struct in_addr dest_ip; + extern struct in_addr myip; + int port = 139; + BOOL ret; + + if (password_client >= 0) + close(password_client); + password_client = -1; + + if (Protocol < PROTOCOL_NT1) { + strcpy(pass_protocol,"LM1.2X002"); + } else { + strcpy(pass_protocol,"NT LM 0.12"); + } + + bzero(inbuf,sizeof(inbuf)); + bzero(outbuf,sizeof(outbuf)); + + for (p=strtok(lp_passwordserver(),LIST_SEP); p ; p = strtok(NULL,LIST_SEP)) { + strcpy(desthost,p); + standard_sub_basic(desthost); + strupper(desthost); + + dest_ip = *interpret_addr2(desthost); + if (zero_ip(dest_ip)) { + DEBUG(1,("Can't resolve address for %s\n",p)); + continue; + } + + if (memcmp(&dest_ip,&myip,sizeof(dest_ip)) == 0) { + DEBUG(1,("Password server loop - disabling password server %s\n",p)); + continue; + } + + password_client = open_socket_out(SOCK_STREAM, &dest_ip, port); + if (password_client >= 0) { + DEBUG(3,("connected to password server %s\n",p)); + StrnCpy(pserver,p,sizeof(pserver)-1); + break; + } + } + + if (password_client < 0) { + DEBUG(1,("password server not available\n")); + return(False); + } + + + /* send a session request (RFC 8002) */ + + /* put in the destination name */ + len = 4; + p = outbuf+len; + name_mangle(desthost,p,' '); + len += name_len(p); + + /* and my name */ + p = outbuf+len; + name_mangle(remote_machine,p,' '); + len += name_len(p); + + _smb_setlen(outbuf,len); + CVAL(outbuf,0) = 0x81; + + send_smb(password_client,outbuf); + receive_smb(password_client,inbuf,5000); + + if (CVAL(inbuf,0) != 0x82) { + DEBUG(1,("%s rejected the session\n",pserver)); + close(password_client); password_client = -1; + return(False); + } + + DEBUG(3,("got session\n")); + + bzero(outbuf,smb_size); + + /* setup the protocol string */ + set_message(outbuf,0,strlen(pass_protocol)+2,True); + p = smb_buf(outbuf); + *p++ = 2; + strcpy(p,pass_protocol); + + CVAL(outbuf,smb_com) = SMBnegprot; + CVAL(outbuf,smb_flg) = 0x8; + SSVAL(outbuf,smb_flg2,0x1); + + send_smb(password_client,outbuf); + ret = receive_smb(password_client,inbuf,5000); + + if (!ret || CVAL(inbuf,smb_rcls) || SVAL(inbuf,smb_vwv0)) { + DEBUG(1,("%s rejected the protocol\n",pserver)); + close(password_client); password_client= -1; + return(False); + } + + if (!(CVAL(inbuf,smb_vwv1) & 1)) { + DEBUG(1,("%s isn't in user level security mode\n",pserver)); + close(password_client); password_client= -1; + return(False); + } + + memcpy(buf,inbuf,smb_len(inbuf)+4); + + DEBUG(3,("password server OK\n")); + + return(True); +} + +/**************************************************************************** +attempted support for server level security +****************************************************************************/ +BOOL server_validate(char *buf) +{ + pstring inbuf,outbuf; + BOOL ret; + + if (password_client < 0) { + DEBUG(1,("%s not connected\n",pserver)); + return(False); + } + + bzero(inbuf,sizeof(inbuf)); + memcpy(outbuf,buf,sizeof(outbuf)); + + /* send a session setup command */ + CVAL(outbuf,smb_flg) = 0x8; + SSVAL(outbuf,smb_flg2,0x1); + CVAL(outbuf,smb_vwv0) = 0xFF; + + set_message(outbuf,smb_numwords(outbuf),smb_buflen(outbuf),False); + + SCVAL(inbuf,smb_rcls,1); + + send_smb(password_client,outbuf); + ret = receive_smb(password_client,inbuf,5000); + + if (!ret || CVAL(inbuf,smb_rcls) != 0) { + DEBUG(1,("password server %s rejected the password\n",pserver)); + return(False); + } + + /* if logged in as guest then reject */ + if ((SVAL(inbuf,smb_vwv2) & 1) != 0) { + DEBUG(1,("password server %s gave us guest only\n",pserver)); + return(False); + } + + DEBUG(3,("password server %s accepted the password\n",pserver)); + +#ifndef KEEP_PASSWORD_SERVER_OPEN + close(password_client); password_client= -1; +#endif + + return(True); +} + + |