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Diffstat (limited to 'source4/auth/credentials/credentials_files.c')
| -rw-r--r-- | source4/auth/credentials/credentials_files.c | 432 |
1 files changed, 432 insertions, 0 deletions
diff --git a/source4/auth/credentials/credentials_files.c b/source4/auth/credentials/credentials_files.c new file mode 100644 index 0000000000..6c3bb2531e --- /dev/null +++ b/source4/auth/credentials/credentials_files.c @@ -0,0 +1,432 @@ +/* + Unix SMB/CIFS implementation. + + User credentials handling (as regards on-disk files) + + 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 "lib/events/events.h" +#include "lib/ldb/include/ldb.h" +#include "librpc/gen_ndr/samr.h" /* for struct samrPassword */ +#include "param/secrets.h" +#include "system/filesys.h" +#include "util/util_ldb.h" +#include "auth/credentials/credentials.h" +#include "auth/credentials/credentials_krb5.h" +#include "param/param.h" +#include "lib/events/events.h" + +/** + * 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; +} + +/** + * 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 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; + + lines = file_lines_load(file, &numlines, 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) { + cli_credentials_set_password(cred, val, obtained); + } else if (strwicmp("username", param) == 0) { + cli_credentials_set_username(cred, val, obtained); + } else if (strwicmp("domain", param) == 0) { + cli_credentials_set_domain(cred, val, obtained); + } else if (strwicmp("realm", param) == 0) { + cli_credentials_set_realm(cred, val, obtained); + } + memset(lines[i], 0, len); + } + + talloc_free(lines); + + return true; +} + + +/** + * Fill in credentials for the machine trust account, from the secrets database. + * + * @param cred Credentials structure to fill in + * @retval NTSTATUS error detailing any failure + */ +_PUBLIC_ NTSTATUS cli_credentials_set_secrets(struct cli_credentials *cred, + struct event_context *event_ctx, + struct loadparm_context *lp_ctx, + struct ldb_context *ldb, + const char *base, + const char *filter) +{ + TALLOC_CTX *mem_ctx; + + int ldb_ret; + struct ldb_message **msgs; + const char *attrs[] = { + "secret", + "priorSecret", + "samAccountName", + "flatname", + "realm", + "secureChannelType", + "unicodePwd", + "msDS-KeyVersionNumber", + "saltPrincipal", + "privateKeytab", + "krb5Keytab", + "servicePrincipalName", + "ldapBindDn", + NULL + }; + + const char *machine_account; + const char *password; + const char *old_password; + const char *domain; + const char *realm; + enum netr_SchannelType sct; + const char *salt_principal; + const char *keytab; + + /* ok, we are going to get it now, don't recurse back here */ + cred->machine_account_pending = false; + + /* some other parts of the system will key off this */ + cred->machine_account = true; + + mem_ctx = talloc_named(cred, 0, "cli_credentials fetch machine password"); + + if (!ldb) { + /* Local secrets are stored in secrets.ldb */ + ldb = secrets_db_connect(mem_ctx, event_ctx, lp_ctx); + if (!ldb) { + /* set anonymous as the fallback, if the machine account won't work */ + cli_credentials_set_anonymous(cred); + DEBUG(1, ("Could not open secrets.ldb\n")); + talloc_free(mem_ctx); + return NT_STATUS_CANT_ACCESS_DOMAIN_INFO; + } + } + + /* search for the secret record */ + ldb_ret = gendb_search(ldb, + mem_ctx, ldb_dn_new(mem_ctx, ldb, base), + &msgs, attrs, + "%s", filter); + if (ldb_ret == 0) { + DEBUG(5, ("(normal if no LDAP backend required) Could not find entry to match filter: '%s' base: '%s'\n", + filter, base)); + /* set anonymous as the fallback, if the machine account won't work */ + cli_credentials_set_anonymous(cred); + talloc_free(mem_ctx); + return NT_STATUS_CANT_ACCESS_DOMAIN_INFO; + } else if (ldb_ret != 1) { + DEBUG(5, ("Found more than one (%d) entry to match filter: '%s' base: '%s'\n", + ldb_ret, filter, base)); + /* set anonymous as the fallback, if the machine account won't work */ + cli_credentials_set_anonymous(cred); + talloc_free(mem_ctx); + return NT_STATUS_CANT_ACCESS_DOMAIN_INFO; + } + + password = ldb_msg_find_attr_as_string(msgs[0], "secret", NULL); + old_password = ldb_msg_find_attr_as_string(msgs[0], "priorSecret", NULL); + + machine_account = ldb_msg_find_attr_as_string(msgs[0], "samAccountName", NULL); + + if (!machine_account) { + machine_account = ldb_msg_find_attr_as_string(msgs[0], "servicePrincipalName", NULL); + + if (!machine_account) { + const char *ldap_bind_dn = ldb_msg_find_attr_as_string(msgs[0], "ldapBindDn", NULL); + if (!ldap_bind_dn) { + DEBUG(1, ("Could not find 'samAccountName', 'servicePrincipalName' or 'ldapBindDn' in secrets record: filter: '%s' base: '%s'\n", + filter, base)); + /* set anonymous as the fallback, if the machine account won't work */ + cli_credentials_set_anonymous(cred); + talloc_free(mem_ctx); + return NT_STATUS_CANT_ACCESS_DOMAIN_INFO; + } + } + } + + salt_principal = ldb_msg_find_attr_as_string(msgs[0], "saltPrincipal", NULL); + cli_credentials_set_salt_principal(cred, salt_principal); + + sct = ldb_msg_find_attr_as_int(msgs[0], "secureChannelType", 0); + if (sct) { + cli_credentials_set_secure_channel_type(cred, sct); + } + + if (!password) { + const struct ldb_val *nt_password_hash = ldb_msg_find_ldb_val(msgs[0], "unicodePwd"); + struct samr_Password hash; + ZERO_STRUCT(hash); + if (nt_password_hash) { + memcpy(hash.hash, nt_password_hash->data, + MIN(nt_password_hash->length, sizeof(hash.hash))); + + cli_credentials_set_nt_hash(cred, &hash, CRED_SPECIFIED); + } else { + cli_credentials_set_password(cred, NULL, CRED_SPECIFIED); + } + } else { + cli_credentials_set_password(cred, password, CRED_SPECIFIED); + } + + + domain = ldb_msg_find_attr_as_string(msgs[0], "flatname", NULL); + if (domain) { + cli_credentials_set_domain(cred, domain, CRED_SPECIFIED); + } + + realm = ldb_msg_find_attr_as_string(msgs[0], "realm", NULL); + if (realm) { + cli_credentials_set_realm(cred, realm, CRED_SPECIFIED); + } + + if (machine_account) { + cli_credentials_set_username(cred, machine_account, CRED_SPECIFIED); + } + + cli_credentials_set_kvno(cred, ldb_msg_find_attr_as_int(msgs[0], "msDS-KeyVersionNumber", 0)); + + /* If there was an external keytab specified by reference in + * the LDB, then use this. Otherwise we will make one up + * (chewing CPU time) from the password */ + keytab = ldb_msg_find_attr_as_string(msgs[0], "krb5Keytab", NULL); + if (keytab) { + cli_credentials_set_keytab_name(cred, event_ctx, lp_ctx, keytab, CRED_SPECIFIED); + } else { + keytab = ldb_msg_find_attr_as_string(msgs[0], "privateKeytab", NULL); + if (keytab) { + keytab = talloc_asprintf(mem_ctx, "FILE:%s", private_path(mem_ctx, lp_ctx, keytab)); + if (keytab) { + cli_credentials_set_keytab_name(cred, event_ctx, lp_ctx, keytab, CRED_SPECIFIED); + } + } + } + talloc_free(mem_ctx); + + return NT_STATUS_OK; +} + +/** + * Fill in credentials for the machine trust account, from the secrets database. + * + * @param cred Credentials structure to fill in + * @retval NTSTATUS error detailing any failure + */ +_PUBLIC_ NTSTATUS cli_credentials_set_machine_account(struct cli_credentials *cred, + struct loadparm_context *lp_ctx) +{ + NTSTATUS status; + char *filter; + /* Bleh, nasty recursion issues: We are setting a machine + * account here, so we don't want the 'pending' flag around + * any more */ + cred->machine_account_pending = false; + filter = talloc_asprintf(cred, SECRETS_PRIMARY_DOMAIN_FILTER, + cli_credentials_get_domain(cred)); + status = cli_credentials_set_secrets(cred, event_context_find(cred), lp_ctx, NULL, + SECRETS_PRIMARY_DOMAIN_DN, + filter); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(1, ("Could not find machine account in secrets database: %s", nt_errstr(status))); + } + return status; +} + +/** + * Fill in credentials for the machine trust account, from the secrets database. + * + * @param cred Credentials structure to fill in + * @retval NTSTATUS error detailing any failure + */ +NTSTATUS cli_credentials_set_krbtgt(struct cli_credentials *cred, + struct event_context *event_ctx, + struct loadparm_context *lp_ctx) +{ + NTSTATUS status; + char *filter; + /* Bleh, nasty recursion issues: We are setting a machine + * account here, so we don't want the 'pending' flag around + * any more */ + cred->machine_account_pending = false; + filter = talloc_asprintf(cred, SECRETS_KRBTGT_SEARCH, + cli_credentials_get_realm(cred), + cli_credentials_get_domain(cred)); + status = cli_credentials_set_secrets(cred, event_ctx, lp_ctx, NULL, + SECRETS_PRINCIPALS_DN, + filter); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(1, ("Could not find krbtgt (master Kerberos) account in secrets database: %s", nt_errstr(status))); + } + return status; +} + +/** + * Fill in credentials for a particular prinicpal, from the secrets database. + * + * @param cred Credentials structure to fill in + * @retval NTSTATUS error detailing any failure + */ +_PUBLIC_ NTSTATUS cli_credentials_set_stored_principal(struct cli_credentials *cred, + struct event_context *event_ctx, + struct loadparm_context *lp_ctx, + const char *serviceprincipal) +{ + NTSTATUS status; + char *filter; + /* Bleh, nasty recursion issues: We are setting a machine + * account here, so we don't want the 'pending' flag around + * any more */ + cred->machine_account_pending = false; + filter = talloc_asprintf(cred, SECRETS_PRINCIPAL_SEARCH, + cli_credentials_get_realm(cred), + cli_credentials_get_domain(cred), + serviceprincipal); + status = cli_credentials_set_secrets(cred, event_ctx, lp_ctx, NULL, + SECRETS_PRINCIPALS_DN, filter); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(1, ("Could not find %s principal in secrets database: %s", serviceprincipal, nt_errstr(status))); + } + return status; +} + +/** + * Ask that when required, the credentials system will be filled with + * machine trust account, from the secrets database. + * + * @param cred Credentials structure to fill in + * @note This function is used to call the above function after, rather + * than during, popt processing. + * + */ +_PUBLIC_ void cli_credentials_set_machine_account_pending(struct cli_credentials *cred, + struct loadparm_context *lp_ctx) +{ + cred->machine_account_pending = true; + cred->machine_account_pending_lp_ctx = lp_ctx; +} + + |