diff options
Diffstat (limited to 'source4/auth/pass_check.c')
| -rw-r--r-- | source4/auth/pass_check.c | 784 |
1 files changed, 784 insertions, 0 deletions
diff --git a/source4/auth/pass_check.c b/source4/auth/pass_check.c new file mode 100644 index 0000000000..88b82e3474 --- /dev/null +++ b/source4/auth/pass_check.c @@ -0,0 +1,784 @@ +/* + Unix SMB/CIFS implementation. + Password checking + 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. +*/ + +/* this module is for checking a username/password against a system + password database. The SMB encrypted password support is elsewhere */ + +#include "includes.h" + +#undef DBGC_CLASS +#define DBGC_CLASS DBGC_AUTH + +/* these are kept here to keep the string_combinations function simple */ +static fstring this_user; +#if !defined(WITH_PAM) +static fstring this_salt; +static fstring this_crypted; +#endif + +#ifdef WITH_AFS + +#include <afs/stds.h> +#include <afs/kautils.h> + +/******************************************************************* +check on AFS authentication +********************************************************************/ +static BOOL afs_auth(char *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, user, (char *)0, /* instance */ + (char *)0, /* cell */ + password, 0, /* lifetime, default */ + &password_expires, /*days 'til it expires */ + 0, /* spare 2 */ + &reason) == 0) + { + return (True); + } + DEBUG(1, + ("AFS authentication for \"%s\" failed (%s)\n", user, reason)); + return (False); +} +#endif + + +#ifdef WITH_DFS + +#include <dce/dce_error.h> +#include <dce/sec_login.h> + +/***************************************************************** + This new version of the DFS_AUTH code was donated by Karsten Muuss + <muuss@or.uni-bonn.de>. It fixes the following problems with the + old code : + + - Server credentials may expire + - Client credential cache files have wrong owner + - purge_context() function is called with invalid argument + + This new code was modified to ensure that on exit the uid/gid is + still root, and the original directory is restored. JRA. +******************************************************************/ + +sec_login_handle_t my_dce_sec_context; +int dcelogin_atmost_once = 0; + +/******************************************************************* +check on a DCE/DFS authentication +********************************************************************/ +static BOOL dfs_auth(char *user, char *password) +{ + error_status_t err; + int err2; + int prterr; + signed32 expire_time, current_time; + boolean32 password_reset; + struct passwd *pw; + sec_passwd_rec_t passwd_rec; + sec_login_auth_src_t auth_src = sec_login_auth_src_network; + unsigned char dce_errstr[dce_c_error_string_len]; + gid_t egid; + + if (dcelogin_atmost_once) + return (False); + +#ifdef HAVE_CRYPT + /* + * 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)) + { + return (False); + } +#endif + + sec_login_get_current_context(&my_dce_sec_context, &err); + if (err != error_status_ok) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0, ("DCE can't get current context. %s\n", dce_errstr)); + + return (False); + } + + sec_login_certify_identity(my_dce_sec_context, &err); + if (err != error_status_ok) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0, ("DCE can't get current context. %s\n", dce_errstr)); + + return (False); + } + + sec_login_get_expiration(my_dce_sec_context, &expire_time, &err); + if (err != error_status_ok) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0, ("DCE can't get expiration. %s\n", dce_errstr)); + + return (False); + } + + time(¤t_time); + + if (expire_time < (current_time + 60)) + { + struct passwd *pw; + sec_passwd_rec_t *key; + + sec_login_get_pwent(my_dce_sec_context, + (sec_login_passwd_t *) & pw, &err); + if (err != error_status_ok) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0, ("DCE can't get pwent. %s\n", dce_errstr)); + + return (False); + } + + sec_login_refresh_identity(my_dce_sec_context, &err); + if (err != error_status_ok) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0, ("DCE can't refresh identity. %s\n", + dce_errstr)); + + return (False); + } + + sec_key_mgmt_get_key(rpc_c_authn_dce_secret, NULL, + (unsigned char *)pw->pw_name, + sec_c_key_version_none, + (void **)&key, &err); + if (err != error_status_ok) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0, ("DCE can't get key for %s. %s\n", + pw->pw_name, dce_errstr)); + + return (False); + } + + sec_login_valid_and_cert_ident(my_dce_sec_context, key, + &password_reset, &auth_src, + &err); + if (err != error_status_ok) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0, + ("DCE can't validate and certify identity for %s. %s\n", + pw->pw_name, dce_errstr)); + } + + sec_key_mgmt_free_key(key, &err); + if (err != error_status_ok) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0, ("DCE can't free key.\n", dce_errstr)); + } + } + + if (sec_login_setup_identity((unsigned char *)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", + user, dce_errstr)); + return (False); + } + + sec_login_get_pwent(my_dce_sec_context, + (sec_login_passwd_t *) & pw, &err); + if (err != error_status_ok) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0, ("DCE can't get pwent. %s\n", dce_errstr)); + + return (False); + } + + 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 can't purge context. %s\n", dce_errstr)); + + return (False); + } + + /* + * NB. I'd like to change these to call something like change_to_user() + * instead but currently we don't have a connection + * context to become the correct user. This is already + * fairly platform specific code however, so I think + * this should be ok. I have added code to go + * back to being root on error though. JRA. + */ + + egid = getegid(); + + set_effective_gid(pw->pw_gid); + set_effective_uid(pw->pw_uid); + + if (sec_login_setup_identity((unsigned char *)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", + user, dce_errstr)); + goto err; + } + + sec_login_get_pwent(my_dce_sec_context, + (sec_login_passwd_t *) & pw, &err); + if (err != error_status_ok) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0, ("DCE can't get pwent. %s\n", dce_errstr)); + goto err; + } + + passwd_rec.version_number = sec_passwd_c_version_none; + passwd_rec.pepper = NULL; + passwd_rec.key.key_type = sec_passwd_plain; + passwd_rec.key.tagged_union.plain = (idl_char *) password; + + sec_login_validate_identity(my_dce_sec_context, + &passwd_rec, &password_reset, + &auth_src, &err); + if (err != error_status_ok) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0, + ("DCE Identity Validation failed for principal %s: %s\n", + user, dce_errstr)); + goto err; + } + + sec_login_certify_identity(my_dce_sec_context, &err); + if (err != error_status_ok) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0, ("DCE certify identity failed: %s\n", dce_errstr)); + goto err; + } + + if (auth_src != sec_login_auth_src_network) + { + DEBUG(0, ("DCE context has no network credentials.\n")); + } + + 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", + user, dce_errstr)); + + sec_login_purge_context(&my_dce_sec_context, &err); + goto err; + } + + sec_login_get_pwent(my_dce_sec_context, + (sec_login_passwd_t *) & pw, &err); + if (err != error_status_ok) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0, ("DCE can't get pwent. %s\n", dce_errstr)); + goto err; + } + + DEBUG(0, ("DCE login succeeded for principal %s on pid %d\n", + user, sys_getpid())); + + DEBUG(3, ("DCE principal: %s\n" + " uid: %d\n" + " gid: %d\n", + pw->pw_name, pw->pw_uid, pw->pw_gid)); + DEBUG(3, (" info: %s\n" + " dir: %s\n" + " shell: %s\n", + pw->pw_gecos, pw->pw_dir, pw->pw_shell)); + + sec_login_get_expiration(my_dce_sec_context, &expire_time, &err); + if (err != error_status_ok) + { + dce_error_inq_text(err, dce_errstr, &err2); + DEBUG(0, ("DCE can't get expiration. %s\n", dce_errstr)); + goto err; + } + + set_effective_uid(0); + set_effective_gid(0); + + DEBUG(0, + ("DCE context expires: %s", asctime(localtime(&expire_time)))); + + dcelogin_atmost_once = 1; + return (True); + + err: + + /* Go back to root, JRA. */ + set_effective_uid(0); + set_effective_gid(egid); + return (False); +} + +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", + sys_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 + +#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); + result[2] = '\0'; + + for (i = 0; i < parts; i++) { + p1 = crypt(p2, salt); + strncat(result, p1 + 2, + AUTH_MAX_PASSWD_LENGTH - strlen(p1 + 2) - 1); + StrnCpy(salt, &result[2 + i * AUTH_CIPHERTEXT_SEG_CHARS], 2); + p2 += AUTH_CLEARTEXT_SEG_CHARS; + } + + return (result); +} +#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 NTSTATUS string_combinations2(char *s, int offset, NTSTATUS (*fn) (const char *), + int N) +{ + int len = strlen(s); + int i; + NTSTATUS nt_status; + +#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 (!NT_STATUS_EQUAL(nt_status = string_combinations2(s, i + 1, fn, N - 1),NT_STATUS_WRONG_PASSWORD)) { + return (nt_status); + } + s[i] = c; + } + return (NT_STATUS_WRONG_PASSWORD); +} + +/**************************************************************************** +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 NTSTATUS string_combinations(char *s, NTSTATUS (*fn) (const char *), int N) +{ + int n; + NTSTATUS nt_status; + for (n = 1; n <= N; n++) + if (!NT_STATUS_EQUAL(nt_status = string_combinations2(s, 0, fn, n), NT_STATUS_WRONG_PASSWORD)) + return nt_status; + return NT_STATUS_WRONG_PASSWORD; +} + + +/**************************************************************************** +core of password checking routine +****************************************************************************/ +static NTSTATUS password_check(const char *password) +{ +#ifdef WITH_PAM + return smb_pam_passcheck(this_user, password); +#else + + BOOL ret; + +#ifdef WITH_AFS + if (afs_auth(this_user, password)) + return NT_STATUS_OK; +#endif /* WITH_AFS */ + +#ifdef WITH_DFS + if (dfs_auth(this_user, password)) + return NT_STATUS_OK; +#endif /* WITH_DFS */ + +#ifdef OSF1_ENH_SEC + + ret = (strcmp(osf1_bigcrypt(password, this_salt), + this_crypted) == 0); + if (!ret) { + DEBUG(2, + ("OSF1_ENH_SEC failed. Trying normal crypt.\n")); + ret = (strcmp((char *)crypt(password, this_salt), this_crypted) == 0); + } + if (ret) { + return NT_STATUS_OK; + } else { + return NT_STATUS_WRONG_PASSWORD; + } + +#endif /* OSF1_ENH_SEC */ + +#ifdef ULTRIX_AUTH + ret = (strcmp((char *)crypt16(password, this_salt), this_crypted) == 0); + if (ret) { + return NT_STATUS_OK; + } else { + return NT_STATUS_WRONG_PASSWORD; + } + +#endif /* ULTRIX_AUTH */ + +#ifdef LINUX_BIGCRYPT + ret = (linux_bigcrypt(password, this_salt, this_crypted)); + if (ret) { + return NT_STATUS_OK; + } else { + return NT_STATUS_WRONG_PASSWORD; + } +#endif /* LINUX_BIGCRYPT */ + +#if defined(HAVE_BIGCRYPT) && defined(HAVE_CRYPT) && defined(USE_BOTH_CRYPT_CALLS) + + /* + * Some systems have bigcrypt in the C library but might not + * actually use it for the password hashes (HPUX 10.20) is + * a noteable example. So we try bigcrypt first, followed + * by crypt. + */ + + if (strcmp(bigcrypt(password, this_salt), this_crypted) == 0) + return NT_STATUS_OK; + else + ret = (strcmp((char *)crypt(password, this_salt), this_crypted) == 0); + if (ret) { + return NT_STATUS_OK; + } else { + return NT_STATUS_WRONG_PASSWORD; + } +#else /* HAVE_BIGCRYPT && HAVE_CRYPT && USE_BOTH_CRYPT_CALLS */ + +#ifdef HAVE_BIGCRYPT + ret = (strcmp(bigcrypt(password, this_salt), this_crypted) == 0); + if (ret) { + return NT_STATUS_OK; + } else { + return NT_STATUS_WRONG_PASSWORD; + } +#endif /* HAVE_BIGCRYPT */ + +#ifndef HAVE_CRYPT + DEBUG(1, ("Warning - no crypt available\n")); + return NT_STATUS_LOGON_FAILURE; +#else /* HAVE_CRYPT */ + ret = (strcmp((char *)crypt(password, this_salt), this_crypted) == 0); + if (ret) { + return NT_STATUS_OK; + } else { + return NT_STATUS_WRONG_PASSWORD; + } +#endif /* HAVE_CRYPT */ +#endif /* HAVE_BIGCRYPT && HAVE_CRYPT && USE_BOTH_CRYPT_CALLS */ +#endif /* WITH_PAM */ +} + + + +/**************************************************************************** +CHECK if a username/password is OK +the function pointer fn() points to a function to call when a successful +match is found and is used to update the encrypted password file +return NT_STATUS_OK on correct match, appropriate error otherwise +****************************************************************************/ + +NTSTATUS pass_check(const struct passwd *pass, const char *user, const char *password, + int pwlen, BOOL (*fn) (const char *, const char *), BOOL run_cracker) +{ + pstring pass2; + int level = lp_passwordlevel(); + + NTSTATUS nt_status; + +#if DEBUG_PASSWORD + DEBUG(100, ("checking user=[%s] pass=[%s]\n", user, password)); +#endif + + if (!password) + return NT_STATUS_LOGON_FAILURE; + + if (((!*password) || (!pwlen)) && !lp_null_passwords()) + return NT_STATUS_LOGON_FAILURE; + +#if defined(WITH_PAM) + + /* + * If we're using PAM we want to short-circuit all the + * checks below and dive straight into the PAM code. + */ + + fstrcpy(this_user, user); + + DEBUG(4, ("pass_check: Checking (PAM) password for user %s (l=%d)\n", user, pwlen)); + +#else /* Not using PAM */ + + DEBUG(4, ("pass_check: Checking password for user %s (l=%d)\n", user, pwlen)); + + if (!pass) { + DEBUG(3, ("Couldn't find user %s\n", user)); + return NT_STATUS_NO_SUCH_USER; + } + + + /* Copy into global for the convenience of looping code */ + /* Also the place to keep the 'password' no matter what + crazy struct it started in... */ + fstrcpy(this_crypted, pass->pw_passwd); + fstrcpy(this_salt, pass->pw_passwd); + +#ifdef HAVE_GETSPNAM + { + 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) { + fstrcpy(this_crypted, spass->sp_pwdp); + fstrcpy(this_salt, spass->sp_pwdp); + } + } +#elif defined(IA_UINFO) + { + /* Need to get password with SVR4.2's ia_ functions + instead of get{sp,pw}ent functions. Required by + UnixWare 2.x, tested on version + 2.1. (tangent@cyberport.com) */ + uinfo_t uinfo; + if (ia_openinfo(pass->pw_name, &uinfo) != -1) + ia_get_logpwd(uinfo, &(pass->pw_passwd)); + } +#endif + +#ifdef HAVE_GETPRPWNAM + { + struct pr_passwd *pr_pw = getprpwnam(pass->pw_name); + if (pr_pw && pr_pw->ufld.fd_encrypt) + fstrcpy(this_crypted, pr_pw->ufld.fd_encrypt); + } +#endif + +#ifdef HAVE_GETPWANAM + { + struct passwd_adjunct *pwret; + pwret = getpwanam(s); + if (pwret && pwret->pwa_passwd) + fstrcpy(this_crypted, pwret->pwa_passwd); + } +#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) { + fstrcpy(this_user, mypasswd->ufld.fd_name); + fstrcpy(this_crypted, mypasswd->ufld.fd_encrypt); + } else { + DEBUG(5, + ("OSF1_ENH_SEC: No entry for user %s in protected database !\n", + user)); + } + } +#endif + +#ifdef ULTRIX_AUTH + { + AUTHORIZATION *ap = getauthuid(pass->pw_uid); + if (ap) { + fstrcpy(this_crypted, ap->a_password); + endauthent(); + } + } +#endif + +#if defined(HAVE_TRUNCATED_SALT) + /* crypt on some platforms (HPUX in particular) + won't work with more than 2 salt characters. */ + this_salt[2] = 0; +#endif + + if (!*this_crypted) { + if (!lp_null_passwords()) { + DEBUG(2, ("Disallowing %s with null password\n", + this_user)); + return NT_STATUS_LOGON_FAILURE; + } + if (!*password) { + DEBUG(3, + ("Allowing access to %s with null password\n", + this_user)); + return NT_STATUS_OK; + } + } + +#endif /* defined(WITH_PAM) */ + + /* try it as it came to us */ + nt_status = password_check(password); + if NT_STATUS_IS_OK(nt_status) { + if (fn) { + fn(user, password); + } + return (nt_status); + } else if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD)) { + /* No point continuing if its not the password thats to blame (ie PAM disabled). */ + return (nt_status); + } + + if (!run_cracker) { + return (nt_status); + } + + /* 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 nt_status; + } + + /* make a copy of it */ + pstrcpy(pass2, password); + + /* try all lowercase if it's currently all uppercase */ + if (strhasupper(pass2)) { + strlower(pass2); + if NT_STATUS_IS_OK(nt_status = password_check(pass2)) { + if (fn) + fn(user, pass2); + return (nt_status); + } + } + + /* give up? */ + if (level < 1) { + return NT_STATUS_WRONG_PASSWORD; + } + + /* last chance - all combinations of up to level chars upper! */ + strlower(pass2); + + + if (NT_STATUS_IS_OK(nt_status = string_combinations(pass2, password_check, level))) { + if (fn) + fn(user, pass2); + return nt_status; + } + + return NT_STATUS_WRONG_PASSWORD; +} |