s3: VFS: Change SMB_VFS_CHDIR to use const struct smb_filename * instead of const...

[Samba.git] / auth / credentials / credentials.c

/* 
   Unix SMB/CIFS implementation.

   User credentials handling

   Copyright (C) Jelmer Vernooij 2005
   Copyright (C) Tim Potter 2001
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   
   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "librpc/gen_ndr/samr.h" /* for struct samrPassword */
#include "auth/credentials/credentials.h"
#include "auth/credentials/credentials_internal.h"
#include "libcli/auth/libcli_auth.h"
#include "tevent.h"
#include "param/param.h"
#include "system/filesys.h"

/**
 * Create a new credentials structure
 * @param mem_ctx TALLOC_CTX parent for credentials structure 
 */
_PUBLIC_ struct cli_credentials *cli_credentials_init(TALLOC_CTX *mem_ctx) 
{
        struct cli_credentials *cred = talloc_zero(mem_ctx, struct cli_credentials);
        if (cred == NULL) {
                return cred;
        }

        cred->winbind_separator = '\\';

        return cred;
}

_PUBLIC_ void cli_credentials_set_callback_data(struct cli_credentials *cred,
                                                void *callback_data)
{
        cred->priv_data = callback_data;
}

_PUBLIC_ void *_cli_credentials_callback_data(struct cli_credentials *cred)
{
        return cred->priv_data;
}

/**
 * Create a new anonymous credential
 * @param mem_ctx TALLOC_CTX parent for credentials structure 
 */
_PUBLIC_ struct cli_credentials *cli_credentials_init_anon(TALLOC_CTX *mem_ctx)
{
        struct cli_credentials *anon_credentials;

        anon_credentials = cli_credentials_init(mem_ctx);
        cli_credentials_set_anonymous(anon_credentials);

        return anon_credentials;
}

_PUBLIC_ void cli_credentials_set_kerberos_state(struct cli_credentials *creds, 
                                        enum credentials_use_kerberos use_kerberos)
{
        creds->use_kerberos = use_kerberos;
}

_PUBLIC_ void cli_credentials_set_forced_sasl_mech(struct cli_credentials *creds,
                                                   const char *sasl_mech)
{
        TALLOC_FREE(creds->forced_sasl_mech);
        creds->forced_sasl_mech = talloc_strdup(creds, sasl_mech);
}

_PUBLIC_ void cli_credentials_set_krb_forwardable(struct cli_credentials *creds,
                                                  enum credentials_krb_forwardable krb_forwardable)
{
        creds->krb_forwardable = krb_forwardable;
}

_PUBLIC_ enum credentials_use_kerberos cli_credentials_get_kerberos_state(struct cli_credentials *creds)
{
        return creds->use_kerberos;
}

_PUBLIC_ const char *cli_credentials_get_forced_sasl_mech(struct cli_credentials *creds)
{
        return creds->forced_sasl_mech;
}

_PUBLIC_ enum credentials_krb_forwardable cli_credentials_get_krb_forwardable(struct cli_credentials *creds)
{
        return creds->krb_forwardable;
}

_PUBLIC_ void cli_credentials_set_gensec_features(struct cli_credentials *creds, uint32_t gensec_features)
{
        creds->gensec_features = gensec_features;
}

_PUBLIC_ uint32_t cli_credentials_get_gensec_features(struct cli_credentials *creds)
{
        return creds->gensec_features;
}


/**
 * Obtain the username for this credentials context.
 * @param cred credentials context
 * @retval The username set on this context.
 * @note Return value will never be NULL except by programmer error.
 */
_PUBLIC_ const char *cli_credentials_get_username(struct cli_credentials *cred)
{
        if (cred->machine_account_pending) {
                cli_credentials_set_machine_account(cred, 
                                        cred->machine_account_pending_lp_ctx);
        }

        if (cred->username_obtained == CRED_CALLBACK && 
            !cred->callback_running) {
                cred->callback_running = true;
                cred->username = cred->username_cb(cred);
                cred->callback_running = false;
                if (cred->username_obtained == CRED_CALLBACK) {
                        cred->username_obtained = CRED_CALLBACK_RESULT;
                        cli_credentials_invalidate_ccache(cred, cred->username_obtained);
                }
        }

        return cred->username;
}

_PUBLIC_ bool cli_credentials_set_username(struct cli_credentials *cred, 
                                  const char *val, enum credentials_obtained obtained)
{
        if (obtained >= cred->username_obtained) {
                cred->username = talloc_strdup(cred, val);
                cred->username_obtained = obtained;
                cli_credentials_invalidate_ccache(cred, cred->username_obtained);
                return true;
        }

        return false;
}

_PUBLIC_ bool cli_credentials_set_username_callback(struct cli_credentials *cred,
                                  const char *(*username_cb) (struct cli_credentials *))
{
        if (cred->username_obtained < CRED_CALLBACK) {
                cred->username_cb = username_cb;
                cred->username_obtained = CRED_CALLBACK;
                return true;
        }

        return false;
}

_PUBLIC_ bool cli_credentials_set_bind_dn(struct cli_credentials *cred, 
                                 const char *bind_dn)
{
        cred->bind_dn = talloc_strdup(cred, bind_dn);
        return true;
}

/**
 * Obtain the BIND DN for this credentials context.
 * @param cred credentials context
 * @retval The username set on this context.
 * @note Return value will be NULL if not specified explictly
 */
_PUBLIC_ const char *cli_credentials_get_bind_dn(struct cli_credentials *cred)
{
        return cred->bind_dn;
}


/**
 * Obtain the client principal for this credentials context.
 * @param cred credentials context
 * @retval The username set on this context.
 * @note Return value will never be NULL except by programmer error.
 */
_PUBLIC_ char *cli_credentials_get_principal_and_obtained(struct cli_credentials *cred, TALLOC_CTX *mem_ctx, enum credentials_obtained *obtained)
{
        if (cred->machine_account_pending) {
                cli_credentials_set_machine_account(cred,
                                        cred->machine_account_pending_lp_ctx);
        }

        if (cred->principal_obtained == CRED_CALLBACK && 
            !cred->callback_running) {
                cred->callback_running = true;
                cred->principal = cred->principal_cb(cred);
                cred->callback_running = false;
                if (cred->principal_obtained == CRED_CALLBACK) {
                        cred->principal_obtained = CRED_CALLBACK_RESULT;
                        cli_credentials_invalidate_ccache(cred, cred->principal_obtained);
                }
        }

        if (cred->principal_obtained < cred->username_obtained
            || cred->principal_obtained < MAX(cred->domain_obtained, cred->realm_obtained)) {
                const char *effective_username = NULL;
                const char *effective_realm = NULL;
                enum credentials_obtained effective_obtained;

                effective_username = cli_credentials_get_username(cred);
                if (effective_username == NULL || strlen(effective_username) == 0) {
                        *obtained = cred->username_obtained;
                        return NULL;
                }

                if (cred->domain_obtained > cred->realm_obtained) {
                        effective_realm = cli_credentials_get_domain(cred);
                        effective_obtained = MIN(cred->domain_obtained,
                                                 cred->username_obtained);
                } else {
                        effective_realm = cli_credentials_get_realm(cred);
                        effective_obtained = MIN(cred->realm_obtained,
                                                 cred->username_obtained);
                }

                if (effective_realm == NULL || strlen(effective_realm) == 0) {
                        effective_realm = cli_credentials_get_domain(cred);
                        effective_obtained = MIN(cred->domain_obtained,
                                                 cred->username_obtained);
                }

                if (effective_realm != NULL && strlen(effective_realm) != 0) {
                        *obtained = effective_obtained;
                        return talloc_asprintf(mem_ctx, "%s@%s", 
                                               effective_username,
                                               effective_realm);
                }
        }
        *obtained = cred->principal_obtained;
        return talloc_strdup(mem_ctx, cred->principal);
}

/**
 * Obtain the client principal for this credentials context.
 * @param cred credentials context
 * @retval The username set on this context.
 * @note Return value will never be NULL except by programmer error.
 */
_PUBLIC_ char *cli_credentials_get_principal(struct cli_credentials *cred, TALLOC_CTX *mem_ctx)
{
        enum credentials_obtained obtained;
        return cli_credentials_get_principal_and_obtained(cred, mem_ctx, &obtained);
}

_PUBLIC_ bool cli_credentials_set_principal(struct cli_credentials *cred, 
                                   const char *val, 
                                   enum credentials_obtained obtained)
{
        if (obtained >= cred->principal_obtained) {
                cred->principal = talloc_strdup(cred, val);
                if (cred->principal == NULL) {
                        return false;
                }
                cred->principal_obtained = obtained;

                cli_credentials_invalidate_ccache(cred, cred->principal_obtained);
                return true;
        }

        return false;
}

/* Set a callback to get the principal.  This could be a popup dialog,
 * a terminal prompt or similar.  */
_PUBLIC_ bool cli_credentials_set_principal_callback(struct cli_credentials *cred,
                                  const char *(*principal_cb) (struct cli_credentials *))
{
        if (cred->principal_obtained < CRED_CALLBACK) {
                cred->principal_cb = principal_cb;
                cred->principal_obtained = CRED_CALLBACK;
                return true;
        }

        return false;
}

/* Some of our tools are 'anonymous by default'.  This is a single
 * function to determine if authentication has been explicitly
 * requested */

_PUBLIC_ bool cli_credentials_authentication_requested(struct cli_credentials *cred) 
{
        if (cred->bind_dn) {
                return true;
        }

        /*
         * If we forced the mech we clearly want authentication. E.g. to use
         * SASL/EXTERNAL which has no credentials.
         */
        if (cred->forced_sasl_mech) {
                return true;
        }

        if (cli_credentials_is_anonymous(cred)){
                return false;
        }

        if (cred->principal_obtained >= CRED_SPECIFIED) {
                return true;
        }
        if (cred->username_obtained >= CRED_SPECIFIED) {
                return true;
        }

        if (cli_credentials_get_kerberos_state(cred) == CRED_MUST_USE_KERBEROS) {
                return true;
        }

        return false;
}

/**
 * Obtain the password for this credentials context.
 * @param cred credentials context
 * @retval If set, the cleartext password, otherwise NULL
 */
_PUBLIC_ const char *cli_credentials_get_password(struct cli_credentials *cred)
{
        if (cred->machine_account_pending) {
                cli_credentials_set_machine_account(cred,
                                                    cred->machine_account_pending_lp_ctx);
        }

        if (cred->password_obtained == CRED_CALLBACK && 
            !cred->callback_running &&
            !cred->password_will_be_nt_hash) {
                cred->callback_running = true;
                cred->password = cred->password_cb(cred);
                cred->callback_running = false;
                if (cred->password_obtained == CRED_CALLBACK) {
                        cred->password_obtained = CRED_CALLBACK_RESULT;
                        cli_credentials_invalidate_ccache(cred, cred->password_obtained);
                }
        }

        return cred->password;
}

/* Set a password on the credentials context, including an indication
 * of 'how' the password was obtained */

_PUBLIC_ bool cli_credentials_set_password(struct cli_credentials *cred, 
                                  const char *val, 
                                  enum credentials_obtained obtained)
{
        if (obtained >= cred->password_obtained) {

                cred->lm_response = data_blob_null;
                cred->nt_response = data_blob_null;
                cred->nt_hash = NULL;
                cred->password = NULL;

                cli_credentials_invalidate_ccache(cred, obtained);

                cred->password_tries = 0;

                if (val == NULL) {
                        cred->password_obtained = obtained;
                        return true;
                }

                if (cred->password_will_be_nt_hash) {
                        struct samr_Password *nt_hash = NULL;
                        size_t val_len = strlen(val);
                        size_t converted;

                        nt_hash = talloc(cred, struct samr_Password);
                        if (nt_hash == NULL) {
                                return false;
                        }

                        converted = strhex_to_str((char *)nt_hash->hash,
                                                  sizeof(nt_hash->hash),
                                                  val, val_len);
                        if (converted != sizeof(nt_hash->hash)) {
                                TALLOC_FREE(nt_hash);
                                return false;
                        }

                        cred->nt_hash = nt_hash;
                        cred->password_obtained = obtained;
                        return true;
                }

                cred->password = talloc_strdup(cred, val);
                if (cred->password == NULL) {
                        return false;
                }

                /* Don't print the actual password in talloc memory dumps */
                talloc_set_name_const(cred->password,
                        "password set via cli_credentials_set_password");
                cred->password_obtained = obtained;

                return true;
        }

        return false;
}

_PUBLIC_ bool cli_credentials_set_password_callback(struct cli_credentials *cred,
                                           const char *(*password_cb) (struct cli_credentials *))
{
        if (cred->password_obtained < CRED_CALLBACK) {
                cred->password_tries = 3;
                cred->password_cb = password_cb;
                cred->password_obtained = CRED_CALLBACK;
                cli_credentials_invalidate_ccache(cred, cred->password_obtained);
                return true;
        }

        return false;
}

/**
 * Obtain the 'old' password for this credentials context (used for join accounts).
 * @param cred credentials context
 * @retval If set, the cleartext password, otherwise NULL
 */
_PUBLIC_ const char *cli_credentials_get_old_password(struct cli_credentials *cred)
{
        if (cred->machine_account_pending) {
                cli_credentials_set_machine_account(cred,
                                                    cred->machine_account_pending_lp_ctx);
        }

        return cred->old_password;
}

_PUBLIC_ bool cli_credentials_set_old_password(struct cli_credentials *cred, 
                                      const char *val, 
                                      enum credentials_obtained obtained)
{
        cred->old_password = talloc_strdup(cred, val);
        if (cred->old_password) {
                /* Don't print the actual password in talloc memory dumps */
                talloc_set_name_const(cred->old_password, "password set via cli_credentials_set_old_password");
        }
        cred->old_nt_hash = NULL;
        return true;
}

/**
 * Obtain the password, in the form MD4(unicode(password)) for this credentials context.
 *
 * Sometimes we only have this much of the password, while the rest of
 * the time this call avoids calling E_md4hash themselves.
 *
 * @param cred credentials context
 * @retval If set, the cleartext password, otherwise NULL
 */
_PUBLIC_ struct samr_Password *cli_credentials_get_nt_hash(struct cli_credentials *cred,
                                                           TALLOC_CTX *mem_ctx)
{
        enum credentials_obtained password_obtained;
        enum credentials_obtained ccache_threshold;
        enum credentials_obtained client_gss_creds_threshold;
        bool password_is_nt_hash;
        const char *password = NULL;
        struct samr_Password *nt_hash = NULL;

        if (cred->nt_hash != NULL) {
                /*
                 * If we already have a hash it's easy.
                 */
                goto return_hash;
        }

        /*
         * This is a bit tricky, with password_will_be_nt_hash
         * we still need to get the value via the password_callback
         * but if we did that we should not remember it's state
         * in the long run so we need to undo it.
         */

        password_obtained = cred->password_obtained;
        ccache_threshold = cred->ccache_threshold;
        client_gss_creds_threshold = cred->client_gss_creds_threshold;
        password_is_nt_hash = cred->password_will_be_nt_hash;

        cred->password_will_be_nt_hash = false;
        password = cli_credentials_get_password(cred);

        cred->password_will_be_nt_hash = password_is_nt_hash;
        if (password_is_nt_hash && password_obtained == CRED_CALLBACK) {
                /*
                 * We got the nt_hash as string via the callback,
                 * so we need to undo the state change.
                 *
                 * And also don't remember it as plaintext password.
                 */
                cred->client_gss_creds_threshold = client_gss_creds_threshold;
                cred->ccache_threshold = ccache_threshold;
                cred->password_obtained = password_obtained;
                cred->password = NULL;
        }

        if (password == NULL) {
                return NULL;
        }

        nt_hash = talloc(cred, struct samr_Password);
        if (nt_hash == NULL) {
                return NULL;
        }

        if (password_is_nt_hash) {
                size_t password_len = strlen(password);
                size_t converted;

                converted = strhex_to_str((char *)nt_hash->hash,
                                          sizeof(nt_hash->hash),
                                          password, password_len);
                if (converted != sizeof(nt_hash->hash)) {
                        TALLOC_FREE(nt_hash);
                        return false;
                }
        } else {
                E_md4hash(password, nt_hash->hash);
        }

        cred->nt_hash = nt_hash;
        nt_hash = NULL;

return_hash:
        nt_hash = talloc(mem_ctx, struct samr_Password);
        if (nt_hash == NULL) {
                return NULL;
        }

        *nt_hash = *cred->nt_hash;

        return nt_hash;
}

/**
 * Obtain the old password, in the form MD4(unicode(password)) for this credentials context.
 *
 * Sometimes we only have this much of the password, while the rest of
 * the time this call avoids calling E_md4hash themselves.
 *
 * @param cred credentials context
 * @retval If set, the cleartext password, otherwise NULL
 */
_PUBLIC_ struct samr_Password *cli_credentials_get_old_nt_hash(struct cli_credentials *cred,
                                                               TALLOC_CTX *mem_ctx)
{
        const char *old_password = NULL;

        if (cred->old_nt_hash != NULL) {
                struct samr_Password *nt_hash = talloc(mem_ctx, struct samr_Password);
                if (!nt_hash) {
                        return NULL;
                }

                *nt_hash = *cred->old_nt_hash;

                return nt_hash;
        }

        old_password = cli_credentials_get_old_password(cred);
        if (old_password) {
                struct samr_Password *nt_hash = talloc(mem_ctx, struct samr_Password);
                if (!nt_hash) {
                        return NULL;
                }

                E_md4hash(old_password, nt_hash->hash);

                return nt_hash;
        }

        return NULL;
}

/**
 * Obtain the 'short' or 'NetBIOS' domain for this credentials context.
 * @param cred credentials context
 * @retval The domain set on this context. 
 * @note Return value will never be NULL except by programmer error.
 */
_PUBLIC_ const char *cli_credentials_get_domain(struct cli_credentials *cred)
{
        if (cred->machine_account_pending) {
                cli_credentials_set_machine_account(cred,
                                                    cred->machine_account_pending_lp_ctx);
        }

        if (cred->domain_obtained == CRED_CALLBACK && 
            !cred->callback_running) {
                cred->callback_running = true;
                cred->domain = cred->domain_cb(cred);
                cred->callback_running = false;
                if (cred->domain_obtained == CRED_CALLBACK) {
                        cred->domain_obtained = CRED_CALLBACK_RESULT;
                        cli_credentials_invalidate_ccache(cred, cred->domain_obtained);
                }
        }

        return cred->domain;
}


_PUBLIC_ bool cli_credentials_set_domain(struct cli_credentials *cred, 
                                const char *val, 
                                enum credentials_obtained obtained)
{
        if (obtained >= cred->domain_obtained) {
                /* it is important that the domain be in upper case,
                 * particularly for the sensitive NTLMv2
                 * calculations */
                cred->domain = strupper_talloc(cred, val);
                cred->domain_obtained = obtained;
                /* setting domain does not mean we have to invalidate ccache 
                 * because domain in not used for Kerberos operations.
                 * If ccache invalidation is required, one will anyway specify
                 * a password to kinit, and that will force invalidation of the ccache
                 */
                return true;
        }

        return false;
}

bool cli_credentials_set_domain_callback(struct cli_credentials *cred,
                                         const char *(*domain_cb) (struct cli_credentials *))
{
        if (cred->domain_obtained < CRED_CALLBACK) {
                cred->domain_cb = domain_cb;
                cred->domain_obtained = CRED_CALLBACK;
                return true;
        }

        return false;
}

/**
 * Obtain the Kerberos realm for this credentials context.
 * @param cred credentials context
 * @retval The realm set on this context. 
 * @note Return value will never be NULL except by programmer error.
 */
_PUBLIC_ const char *cli_credentials_get_realm(struct cli_credentials *cred)
{       
        if (cred->machine_account_pending) {
                cli_credentials_set_machine_account(cred,
                                                    cred->machine_account_pending_lp_ctx);
        }

        if (cred->realm_obtained == CRED_CALLBACK && 
            !cred->callback_running) {
                cred->callback_running = true;
                cred->realm = cred->realm_cb(cred);
                cred->callback_running = false;
                if (cred->realm_obtained == CRED_CALLBACK) {
                        cred->realm_obtained = CRED_CALLBACK_RESULT;
                        cli_credentials_invalidate_ccache(cred, cred->realm_obtained);
                }
        }

        return cred->realm;
}

/**
 * Set the realm for this credentials context, and force it to
 * uppercase for the sainity of our local kerberos libraries 
 */
_PUBLIC_ bool cli_credentials_set_realm(struct cli_credentials *cred, 
                               const char *val, 
                               enum credentials_obtained obtained)
{
        if (obtained >= cred->realm_obtained) {
                cred->realm = strupper_talloc(cred, val);
                cred->realm_obtained = obtained;
                cli_credentials_invalidate_ccache(cred, cred->realm_obtained);
                return true;
        }

        return false;
}

bool cli_credentials_set_realm_callback(struct cli_credentials *cred,
                                        const char *(*realm_cb) (struct cli_credentials *))
{
        if (cred->realm_obtained < CRED_CALLBACK) {
                cred->realm_cb = realm_cb;
                cred->realm_obtained = CRED_CALLBACK;
                return true;
        }

        return false;
}

/**
 * Obtain the 'short' or 'NetBIOS' workstation name for this credentials context.
 *
 * @param cred credentials context
 * @retval The workstation name set on this context. 
 * @note Return value will never be NULL except by programmer error.
 */
_PUBLIC_ const char *cli_credentials_get_workstation(struct cli_credentials *cred)
{
        if (cred->workstation_obtained == CRED_CALLBACK && 
            !cred->callback_running) {
                cred->callback_running = true;
                cred->workstation = cred->workstation_cb(cred);
                cred->callback_running = false;
                if (cred->workstation_obtained == CRED_CALLBACK) {
                        cred->workstation_obtained = CRED_CALLBACK_RESULT;
                }
        }

        return cred->workstation;
}

_PUBLIC_ bool cli_credentials_set_workstation(struct cli_credentials *cred, 
                                     const char *val, 
                                     enum credentials_obtained obtained)
{
        if (obtained >= cred->workstation_obtained) {
                cred->workstation = talloc_strdup(cred, val);
                cred->workstation_obtained = obtained;
                return true;
        }

        return false;
}

bool cli_credentials_set_workstation_callback(struct cli_credentials *cred,
                                              const char *(*workstation_cb) (struct cli_credentials *))
{
        if (cred->workstation_obtained < CRED_CALLBACK) {
                cred->workstation_cb = workstation_cb;
                cred->workstation_obtained = CRED_CALLBACK;
                return true;
        }

        return false;
}

/**
 * Given a string, typically obtained from a -U argument, parse it into domain, username, realm and password fields
 *
 * The format accepted is [domain\\]user[%password] or user[@realm][%password]
 *
 * @param credentials Credentials structure on which to set the password
 * @param data the string containing the username, password etc
 * @param obtained This enum describes how 'specified' this password is
 */

_PUBLIC_ void cli_credentials_parse_string(struct cli_credentials *credentials, const char *data, enum credentials_obtained obtained)
{
        char *uname, *p;

        if (strcmp("%",data) == 0) {
                cli_credentials_set_anonymous(credentials);
                return;
        }

        uname = talloc_strdup(credentials, data); 
        if ((p = strchr_m(uname,'%'))) {
                *p = 0;
                cli_credentials_set_password(credentials, p+1, obtained);
        }

        if ((p = strchr_m(uname,'@'))) {
                /*
                 * We also need to set username and domain
                 * in order to undo the effect of
                 * cli_credentials_guess().
                 */
                cli_credentials_set_username(credentials, uname, obtained);
                cli_credentials_set_domain(credentials, "", obtained);

                cli_credentials_set_principal(credentials, uname, obtained);
                *p = 0;
                cli_credentials_set_realm(credentials, p+1, obtained);
                return;
        } else if ((p = strchr_m(uname,'\\'))
                   || (p = strchr_m(uname, '/'))
                   || (p = strchr_m(uname, credentials->winbind_separator)))
        {
                const char *domain = NULL;

                domain = uname;
                *p = 0;
                uname = p+1;

                if (obtained == credentials->realm_obtained &&
                    !strequal_m(credentials->domain, domain))
                {
                        /*
                         * We need to undo a former set with the same level
                         * in order to get the expected result from
                         * cli_credentials_get_principal().
                         *
                         * But we only need to do that if the domain
                         * actually changes.
                         */
                        cli_credentials_set_realm(credentials, domain, obtained);
                }
                cli_credentials_set_domain(credentials, domain, obtained);
        }
        if (obtained == credentials->principal_obtained &&
            !strequal_m(credentials->username, uname))
        {
                /*
                 * We need to undo a former set with the same level
                 * in order to get the expected result from
                 * cli_credentials_get_principal().
                 *
                 * But we only need to do that if the username
                 * actually changes.
                 */
                credentials->principal_obtained = CRED_UNINITIALISED;
                credentials->principal = NULL;
        }
        cli_credentials_set_username(credentials, uname, obtained);
}

/**
 * Given a a credentials structure, print it as a string
 *
 * The format output is [domain\\]user[%password] or user[@realm][%password]
 *
 * @param credentials Credentials structure on which to set the password
 * @param mem_ctx The memory context to place the result on
 */

_PUBLIC_ char *cli_credentials_get_unparsed_name(struct cli_credentials *credentials, TALLOC_CTX *mem_ctx)
{
        const char *bind_dn = cli_credentials_get_bind_dn(credentials);
        const char *domain = NULL;
        const char *username = NULL;
        char *name = NULL;

        if (bind_dn) {
                name = talloc_strdup(mem_ctx, bind_dn);
        } else {
                cli_credentials_get_ntlm_username_domain(credentials, mem_ctx, &username, &domain);
                if (domain && domain[0]) {
                        name = talloc_asprintf(mem_ctx, "%s\\%s", 
                                               domain, username);
                } else {
                        name = talloc_asprintf(mem_ctx, "%s", 
                                               username);
                }
        }
        return name;
}

/**
 * Specifies default values for domain, workstation and realm
 * from the smb.conf configuration file
 *
 * @param cred Credentials structure to fill in
 */
_PUBLIC_ void cli_credentials_set_conf(struct cli_credentials *cred, 
                              struct loadparm_context *lp_ctx)
{
        const char *sep = NULL;
        const char *realm = lpcfg_realm(lp_ctx);

        cli_credentials_set_username(cred, "", CRED_UNINITIALISED);
        if (lpcfg_parm_is_cmdline(lp_ctx, "workgroup")) {
                cli_credentials_set_domain(cred, lpcfg_workgroup(lp_ctx), CRED_SPECIFIED);
        } else {
                cli_credentials_set_domain(cred, lpcfg_workgroup(lp_ctx), CRED_UNINITIALISED);
        }
        if (lpcfg_parm_is_cmdline(lp_ctx, "netbios name")) {
                cli_credentials_set_workstation(cred, lpcfg_netbios_name(lp_ctx), CRED_SPECIFIED);
        } else {
                cli_credentials_set_workstation(cred, lpcfg_netbios_name(lp_ctx), CRED_UNINITIALISED);
        }
        if (realm != NULL && strlen(realm) == 0) {
                realm = NULL;
        }
        if (lpcfg_parm_is_cmdline(lp_ctx, "realm")) {
                cli_credentials_set_realm(cred, realm, CRED_SPECIFIED);
        } else {
                cli_credentials_set_realm(cred, realm, CRED_UNINITIALISED);
        }

        sep = lpcfg_winbind_separator(lp_ctx);
        if (sep != NULL && sep[0] != '\0') {
                cred->winbind_separator = *lpcfg_winbind_separator(lp_ctx);
        }
}

/**
 * Guess defaults for credentials from environment variables, 
 * and from the configuration file
 * 
 * @param cred Credentials structure to fill in
 */
_PUBLIC_ void cli_credentials_guess(struct cli_credentials *cred,
                           struct loadparm_context *lp_ctx)
{
        char *p;
        const char *error_string;

        if (lp_ctx != NULL) {
                cli_credentials_set_conf(cred, lp_ctx);
        }
        
        if (getenv("LOGNAME")) {
                cli_credentials_set_username(cred, getenv("LOGNAME"), CRED_GUESS_ENV);
        }

        if (getenv("USER")) {
                cli_credentials_parse_string(cred, getenv("USER"), CRED_GUESS_ENV);
                if ((p = strchr_m(getenv("USER"),'%'))) {
                        memset(p,0,strlen(cred->password));
                }
        }

        if (getenv("PASSWD")) {
                cli_credentials_set_password(cred, getenv("PASSWD"), CRED_GUESS_ENV);
        }

        if (getenv("PASSWD_FD")) {
                cli_credentials_parse_password_fd(cred, atoi(getenv("PASSWD_FD")), 
                                                  CRED_GUESS_FILE);
        }
        
        p = getenv("PASSWD_FILE");
        if (p && p[0]) {
                cli_credentials_parse_password_file(cred, p, CRED_GUESS_FILE);
        }
        
        if (cli_credentials_get_kerberos_state(cred) != CRED_DONT_USE_KERBEROS) {
                cli_credentials_set_ccache(cred, lp_ctx, NULL, CRED_GUESS_FILE,
                                           &error_string);
        }
}

/**
 * Attach NETLOGON credentials for use with SCHANNEL
 */

_PUBLIC_ void cli_credentials_set_netlogon_creds(struct cli_credentials *cred, 
                                                 struct netlogon_creds_CredentialState *netlogon_creds)
{
        TALLOC_FREE(cred->netlogon_creds);
        if (netlogon_creds == NULL) {
                return;
        }
        cred->netlogon_creds = netlogon_creds_copy(cred, netlogon_creds);
}

/**
 * Return attached NETLOGON credentials 
 */

_PUBLIC_ struct netlogon_creds_CredentialState *cli_credentials_get_netlogon_creds(struct cli_credentials *cred)
{
        return cred->netlogon_creds;
}

/** 
 * Set NETLOGON secure channel type
 */

_PUBLIC_ void cli_credentials_set_secure_channel_type(struct cli_credentials *cred,
                                             enum netr_SchannelType secure_channel_type)
{
        cred->secure_channel_type = secure_channel_type;
}

/**
 * Return NETLOGON secure chanel type
 */

_PUBLIC_ time_t cli_credentials_get_password_last_changed_time(struct cli_credentials *cred)
{
        return cred->password_last_changed_time;
}

/** 
 * Set NETLOGON secure channel type
 */

_PUBLIC_ void cli_credentials_set_password_last_changed_time(struct cli_credentials *cred,
                                                             time_t last_changed_time)
{
        cred->password_last_changed_time = last_changed_time;
}

/**
 * Return NETLOGON secure chanel type
 */

_PUBLIC_ enum netr_SchannelType cli_credentials_get_secure_channel_type(struct cli_credentials *cred)
{
        return cred->secure_channel_type;
}

/**
 * Fill in a credentials structure as the anonymous user
 */
_PUBLIC_ void cli_credentials_set_anonymous(struct cli_credentials *cred) 
{
        cli_credentials_set_username(cred, "", CRED_SPECIFIED);
        cli_credentials_set_domain(cred, "", CRED_SPECIFIED);
        cli_credentials_set_password(cred, NULL, CRED_SPECIFIED);
        cli_credentials_set_principal(cred, NULL, CRED_SPECIFIED);
        cli_credentials_set_realm(cred, NULL, CRED_SPECIFIED);
        cli_credentials_set_workstation(cred, "", CRED_UNINITIALISED);
        cli_credentials_set_kerberos_state(cred, CRED_DONT_USE_KERBEROS);
}

/**
 * Describe a credentials context as anonymous or authenticated
 * @retval true if anonymous, false if a username is specified
 */

_PUBLIC_ bool cli_credentials_is_anonymous(struct cli_credentials *cred)
{
        const char *username;
        
        /* if bind dn is set it's not anonymous */
        if (cred->bind_dn) {
                return false;
        }

        if (cred->machine_account_pending) {
                cli_credentials_set_machine_account(cred,
                                                    cred->machine_account_pending_lp_ctx);
        }

        /* if principal is set, it's not anonymous */
        if ((cred->principal != NULL) && cred->principal_obtained >= cred->username_obtained) {
                return false;
        }

        username = cli_credentials_get_username(cred);
        
        /* Yes, it is deliberate that we die if we have a NULL pointer
         * here - anonymous is "", not NULL, which is 'never specified,
         * never guessed', ie programmer bug */
        if (!username[0]) {
                return true;
        }

        return false;
}

/**
 * Mark the current password for a credentials struct as wrong. This will 
 * cause the password to be prompted again (if a callback is set).
 *
 * This will decrement the number of times the password can be tried.
 *
 * @retval whether the credentials struct is finished
 */
_PUBLIC_ bool cli_credentials_wrong_password(struct cli_credentials *cred)
{
        if (cred->password_obtained != CRED_CALLBACK_RESULT) {
                return false;
        }

        if (cred->password_tries == 0) {
                return false;
        }

        cred->password_tries--;

        if (cred->password_tries == 0) {
                return false;
        }

        cred->password_obtained = CRED_CALLBACK;
        return true;
}

_PUBLIC_ void cli_credentials_get_ntlm_username_domain(struct cli_credentials *cred, TALLOC_CTX *mem_ctx, 
                                              const char **username, 
                                              const char **domain) 
{
        if (cred->principal_obtained > cred->username_obtained) {
                *domain = talloc_strdup(mem_ctx, "");
                *username = cli_credentials_get_principal(cred, mem_ctx);
        } else {
                *domain = cli_credentials_get_domain(cred);
                *username = cli_credentials_get_username(cred);
        }
}

/**
 * Read a named file, and parse it for username, domain, realm and password
 *
 * @param credentials Credentials structure on which to set the password
 * @param file a named file to read the details from 
 * @param obtained This enum describes how 'specified' this password is
 */

_PUBLIC_ bool cli_credentials_parse_file(struct cli_credentials *cred, const char *file, enum credentials_obtained obtained) 
{
        uint16_t len = 0;
        char *ptr, *val, *param;
        char **lines;
        int i, numlines;
        const char *realm = NULL;
        const char *domain = NULL;
        const char *password = NULL;
        const char *username = NULL;

        lines = file_lines_load(file, &numlines, 0, NULL);

        if (lines == NULL)
        {
                /* fail if we can't open the credentials file */
                d_printf("ERROR: Unable to open credentials file!\n");
                return false;
        }

        for (i = 0; i < numlines; i++) {
                len = strlen(lines[i]);

                if (len == 0)
                        continue;

                /* break up the line into parameter & value.
                 * will need to eat a little whitespace possibly */
                param = lines[i];
                if (!(ptr = strchr_m (lines[i], '=')))
                        continue;

                val = ptr+1;
                *ptr = '\0';

                /* eat leading white space */
                while ((*val!='\0') && ((*val==' ') || (*val=='\t')))
                        val++;

                if (strwicmp("password", param) == 0) {
                        password = val;
                } else if (strwicmp("username", param) == 0) {
                        username = val;
                } else if (strwicmp("domain", param) == 0) {
                        domain = val;
                } else if (strwicmp("realm", param) == 0) {
                        realm = val;
                }

                /*
                 * We need to readd '=' in order to let
                 * the strlen() work in the last loop
                 * that clears the memory.
                 */
                *ptr = '=';
        }

        if (realm != NULL && strlen(realm) != 0) {
                /*
                 * only overwrite with a valid string
                 */
                cli_credentials_set_realm(cred, realm, obtained);
        }

        if (domain != NULL && strlen(domain) != 0) {
                /*
                 * only overwrite with a valid string
                 */
                cli_credentials_set_domain(cred, domain, obtained);
        }

        if (password != NULL) {
                /*
                 * Here we allow "".
                 */
                cli_credentials_set_password(cred, password, obtained);
        }

        if (username != NULL) {
                /*
                 * The last "username" line takes preference
                 * if the string also contains domain, realm or
                 * password.
                 */
                cli_credentials_parse_string(cred, username, obtained);
        }

        for (i = 0; i < numlines; i++) {
                len = strlen(lines[i]);
                memset(lines[i], 0, len);
        }
        talloc_free(lines);

        return true;
}

/**
 * Read a named file, and parse it for a password
 *
 * @param credentials Credentials structure on which to set the password
 * @param file a named file to read the password from 
 * @param obtained This enum describes how 'specified' this password is
 */

_PUBLIC_ bool cli_credentials_parse_password_file(struct cli_credentials *credentials, const char *file, enum credentials_obtained obtained)
{
        int fd = open(file, O_RDONLY, 0);
        bool ret;

        if (fd < 0) {
                fprintf(stderr, "Error opening password file %s: %s\n",
                                file, strerror(errno));
                return false;
        }

        ret = cli_credentials_parse_password_fd(credentials, fd, obtained);

        close(fd);
        
        return ret;
}


/**
 * Read a file descriptor, and parse it for a password (eg from a file or stdin)
 *
 * @param credentials Credentials structure on which to set the password
 * @param fd open file descriptor to read the password from 
 * @param obtained This enum describes how 'specified' this password is
 */

_PUBLIC_ bool cli_credentials_parse_password_fd(struct cli_credentials *credentials, 
                                       int fd, enum credentials_obtained obtained)
{
        char *p;
        char pass[128];

        for(p = pass, *p = '\0'; /* ensure that pass is null-terminated */
                p && p - pass < sizeof(pass);) {
                switch (read(fd, p, 1)) {
                case 1:
                        if (*p != '\n' && *p != '\0') {
                                *++p = '\0'; /* advance p, and null-terminate pass */
                                break;
                        }
                        /* fall through */
                case 0:
                        if (p - pass) {
                                *p = '\0'; /* null-terminate it, just in case... */
                                p = NULL; /* then force the loop condition to become false */
                                break;
                        } else {
                                fprintf(stderr, "Error reading password from file descriptor %d: %s\n", fd, "empty password\n");
                                return false;
                        }

                default:
                        fprintf(stderr, "Error reading password from file descriptor %d: %s\n",
                                        fd, strerror(errno));
                        return false;
                }
        }

        cli_credentials_set_password(credentials, pass, obtained);
        return true;
}


/**
 * Encrypt a data blob using the session key and the negotiated encryption
 * algorithm
 *
 * @param state Credential state, contains the session key and algorithm
 * @param data Data blob containing the data to be encrypted.
 *
 */
_PUBLIC_ NTSTATUS netlogon_creds_session_encrypt(
        struct netlogon_creds_CredentialState *state,
        DATA_BLOB data)
{
        if (data.data == NULL || data.length == 0) {
                DBG_ERR("Nothing to encrypt "
                        "data.data == NULL or data.length == 0");
                return NT_STATUS_INVALID_PARAMETER;
        }
        /*
         * Don't crypt an all-zero password it will give away the
         * NETLOGON pipe session key .
         */
        if (all_zero(data.data, data.length)) {
                DBG_ERR("Supplied data all zeros, could leak session key");
                return NT_STATUS_INVALID_PARAMETER;
        }
        if (state->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
                netlogon_creds_aes_encrypt(state,
                                           data.data,
                                           data.length);
        } else if (state->negotiate_flags & NETLOGON_NEG_ARCFOUR) {
                netlogon_creds_arcfour_crypt(state,
                                             data.data,
                                             data.length);
        } else {
                DBG_ERR("Unsupported encryption option negotiated");
                return NT_STATUS_NOT_SUPPORTED;
        }
        return NT_STATUS_OK;
}