diff options
Diffstat (limited to 'source4')
-rw-r--r-- | source4/libcli/auth/kerberos_verify.c | 202 |
1 files changed, 122 insertions, 80 deletions
diff --git a/source4/libcli/auth/kerberos_verify.c b/source4/libcli/auth/kerberos_verify.c index 6e7907fc43..fd4c3f6ba3 100644 --- a/source4/libcli/auth/kerberos_verify.c +++ b/source4/libcli/auth/kerberos_verify.c @@ -6,6 +6,7 @@ Copyright (C) Luke Howard 2003 Copyright (C) Guenther Deschner 2003 Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003 + Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005 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 @@ -79,15 +80,34 @@ static krb5_error_code ads_keytab_verify_ticket(TALLOC_CTX *mem_ctx, krb5_contex krb5_keyblock *keyblock) { krb5_error_code ret = 0; - BOOL auth_ok = False; + krb5_error_code our_ret = 0; krb5_keytab keytab = NULL; - char *my_fqdn; - fstring my_name; - fstring my_Fqdn, my_NAME; - char *p_fqdn; - char *host_princ_s[18]; - krb5_principal host_princ; + krb5_kt_cursor kt_cursor; + krb5_keytab_entry kt_entry; + char *valid_princ_formats[7] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL }; + char *entry_princ_s = NULL; + const char *my_name, *my_fqdn; int i; + int number_matched_principals = 0; + + /* Generate the list of principal names which we expect + * clients might want to use for authenticating to the file + * service. We allow name$,{host,cifs}/{name,fqdn,name.REALM}. */ + + my_name = lp_netbios_name(); + + my_fqdn = name_to_fqdn(mem_ctx, my_name); + + asprintf(&valid_princ_formats[0], "%s$@%s", my_name, lp_realm()); + asprintf(&valid_princ_formats[1], "host/%s@%s", my_name, lp_realm()); + asprintf(&valid_princ_formats[2], "host/%s@%s", my_fqdn, lp_realm()); + asprintf(&valid_princ_formats[3], "host/%s.%s@%s", my_name, lp_realm(), lp_realm()); + asprintf(&valid_princ_formats[4], "cifs/%s@%s", my_name, lp_realm()); + asprintf(&valid_princ_formats[5], "cifs/%s@%s", my_fqdn, lp_realm()); + asprintf(&valid_princ_formats[6], "cifs/%s.%s@%s", my_name, lp_realm(), lp_realm()); + + ZERO_STRUCT(kt_entry); + ZERO_STRUCT(kt_cursor); ret = krb5_kt_default(context, &keytab); if (ret) { @@ -95,73 +115,90 @@ static krb5_error_code ads_keytab_verify_ticket(TALLOC_CTX *mem_ctx, krb5_contex goto out; } - /* Generate the list of principal names which we expect clients might - * want to use for authenticating to the file service. */ + /* Iterate through the keytab. For each key, if the principal + * name case-insensitively matches one of the allowed formats, + * try verifying the ticket using that principal. */ - fstrcpy(my_name, lp_netbios_name()); - strlower_m(my_name); + ret = krb5_kt_start_seq_get(context, keytab, &kt_cursor); + if (ret) { + DEBUG(1, ("ads_keytab_verify_ticket: krb5_kt_start_seq_get failed (%s)\n", error_message(ret))); + goto out; + } + + ret = krb5_kt_start_seq_get(context, keytab, &kt_cursor); + if (ret != KRB5_KT_END && ret != ENOENT ) { + while (ret && (krb5_kt_next_entry(context, keytab, &kt_entry, &kt_cursor) == 0)) { + ret = krb5_unparse_name(context, kt_entry.principal, &entry_princ_s); + if (ret) { + DEBUG(1, ("ads_keytab_verify_ticket: krb5_unparse_name failed (%s)\n", error_message(ret))); + break; + } + ret = KRB5_BAD_ENCTYPE; + for (i = 0; i < sizeof(valid_princ_formats) / sizeof(valid_princ_formats[0]); i++) { + if (strequal(entry_princ_s, valid_princ_formats[i])) { + number_matched_principals++; + p_packet->length = ticket->length; + p_packet->data = (krb5_pointer)ticket->data; + *pp_tkt = NULL; + our_ret = krb5_rd_req(context, &auth_context, p_packet, kt_entry.principal, keytab, NULL, pp_tkt); + if (our_ret != KRB5_BAD_ENCTYPE) { + ret = our_ret; + } + if (our_ret) { + DEBUG(10, ("ads_keytab_verify_ticket: krb5_rd_req(%s) failed: %s\n", + entry_princ_s, error_message(our_ret))); + } else { + DEBUG(3,("ads_keytab_verify_ticket: krb5_rd_req succeeded for principal %s\n", + entry_princ_s)); + break; + } + } + } + + /* Free the name we parsed. */ + krb5_free_unparsed_name(context, entry_princ_s); + entry_princ_s = NULL; + + /* Free the entry we just read. */ + smb_krb5_kt_free_entry(context, &kt_entry); + ZERO_STRUCT(kt_entry); + } + krb5_kt_end_seq_get(context, keytab, &kt_cursor); + } - fstrcpy(my_NAME, lp_netbios_name()); - strupper_m(my_NAME); + ZERO_STRUCT(kt_cursor); - my_fqdn = name_to_fqdn(mem_ctx, lp_netbios_name()); - strlower_m(my_fqdn); + out: - p_fqdn = strchr_m(my_fqdn, '.'); - fstrcpy(my_Fqdn, my_NAME); - if (p_fqdn) { - fstrcat(my_Fqdn, p_fqdn); + if (ret) { + if (!number_matched_principals) { + DEBUG(3, ("ads_keytab_verify_ticket: no keytab principals matched expected file service name.\n")); + } else { + DEBUG(3, ("ads_keytab_verify_ticket: krb5_rd_req failed for all %d matched keytab principals\n", + number_matched_principals)); + } + DEBUG(3, ("ads_keytab_verify_ticket: last error: %s\n", error_message(ret))); } - asprintf(&host_princ_s[0], "%s$@%s", my_name, lp_realm()); - asprintf(&host_princ_s[1], "%s$@%s", my_NAME, lp_realm()); - asprintf(&host_princ_s[2], "host/%s@%s", my_name, lp_realm()); - asprintf(&host_princ_s[3], "host/%s@%s", my_NAME, lp_realm()); - asprintf(&host_princ_s[4], "host/%s@%s", my_fqdn, lp_realm()); - asprintf(&host_princ_s[5], "host/%s@%s", my_Fqdn, lp_realm()); - asprintf(&host_princ_s[6], "HOST/%s@%s", my_name, lp_realm()); - asprintf(&host_princ_s[7], "HOST/%s@%s", my_NAME, lp_realm()); - asprintf(&host_princ_s[8], "HOST/%s@%s", my_fqdn, lp_realm()); - asprintf(&host_princ_s[9], "HOST/%s@%s", my_Fqdn, lp_realm()); - asprintf(&host_princ_s[10], "%s/%s@%s", service, my_name, lp_realm()); - asprintf(&host_princ_s[11], "%s/%s@%s", service, my_NAME, lp_realm()); - asprintf(&host_princ_s[12], "%s/%s@%s", service, my_fqdn, lp_realm()); - asprintf(&host_princ_s[13], "%s/%s@%s", service, my_Fqdn, lp_realm()); - asprintf(&host_princ_s[14], "%s/%s@%s", strupper_talloc(mem_ctx, service), my_name, lp_realm()); - asprintf(&host_princ_s[15], "%s/%s@%s", strupper_talloc(mem_ctx, service), my_NAME, lp_realm()); - asprintf(&host_princ_s[16], "%s/%s@%s", strupper_talloc(mem_ctx, service), my_fqdn, lp_realm()); - asprintf(&host_princ_s[17], "%s/%s@%s", strupper_talloc(mem_ctx, service), my_Fqdn, lp_realm()); - - /* Now try to verify the ticket using the key associated with each of - * the principals which we think clients will expect us to be - * participating as. */ - for (i = 0; i < sizeof(host_princ_s) / sizeof(host_princ_s[0]); i++) { - host_princ = NULL; - ret = krb5_parse_name(context, host_princ_s[i], &host_princ); - if (ret) { - DEBUG(1, ("ads_keytab_verify_ticket: krb5_parse_name(%s) failed (%s)\n", - host_princ_s[i], error_message(ret))); - goto out; - } - p_packet->length = ticket->length; - p_packet->data = (krb5_pointer)ticket->data; - *pp_tkt = NULL; - ret = krb5_rd_req(context, &auth_context, p_packet, host_princ, keytab, NULL, pp_tkt); - krb5_free_principal(context, host_princ); - if (ret) { - DEBUG(0, ("krb5_rd_req(%s) failed: %s\n", host_princ_s[i], error_message(ret))); - } else { - DEBUG(10,("krb5_rd_req succeeded for principal %s\n", host_princ_s[i])); - auth_ok = True; - break; - } + if (entry_princ_s) { + krb5_free_unparsed_name(context, entry_princ_s); } - for (i = 0; i < sizeof(host_princ_s) / sizeof(host_princ_s[0]); i++) { - SAFE_FREE(host_princ_s[i]); + { + krb5_keytab_entry zero_kt_entry; + ZERO_STRUCT(zero_kt_entry); + if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) { + smb_krb5_kt_free_entry(context, &kt_entry); + } } - out: + { + krb5_kt_cursor zero_csr; + ZERO_STRUCT(zero_csr); + if ((memcmp(&kt_cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) { + krb5_kt_end_seq_get(context, keytab, &kt_cursor); + } + } if (keytab) { krb5_kt_close(context, keytab); @@ -182,11 +219,12 @@ static krb5_error_code ads_secrets_verify_ticket(TALLOC_CTX *mem_ctx, krb5_conte krb5_keyblock *keyblock) { krb5_error_code ret = 0; + krb5_error_code our_ret; krb5_data password; krb5_enctype *enctypes = NULL; int i; const struct ldb_val *password_v; - struct ldb_wrap *ldb; + struct ldb_context *ldb; int ldb_ret; struct ldb_message **msgs; const char *base_dn = SECRETS_PRIMARY_DOMAIN_DN; @@ -228,36 +266,42 @@ static krb5_error_code ads_secrets_verify_ticket(TALLOC_CTX *mem_ctx, krb5_conte if ((ret = get_kerberos_allowed_etypes(context, &enctypes))) { DEBUG(1,("ads_secrets_verify_ticket: krb5_get_permitted_enctypes failed (%s)\n", error_message(ret))); - goto out; + return ret; } p_packet->length = ticket->length; p_packet->data = (krb5_pointer)ticket->data; - ret = KRB5_BAD_ENCTYPE; /* We need to setup a auth context with each possible encoding type in turn. */ + + ret = KRB5_BAD_ENCTYPE; for (i=0;enctypes[i];i++) { - krb5_error_code our_ret; - our_ret = create_kerberos_key_from_string(context, host_princ, &password, keyblock, enctypes[i]); - if (our_ret) { - ret = our_ret; + krb5_keyblock *key = NULL; + + if (!(key = malloc_p(krb5_keyblock))) { + break; + } + + if (create_kerberos_key_from_string(context, host_princ, &password, key, enctypes[i])) { + SAFE_FREE(key); continue; } - krb5_auth_con_setuseruserkey(context, auth_context, keyblock); + krb5_auth_con_setuseruserkey(context, auth_context, key); + + krb5_free_keyblock(context, key); our_ret = krb5_rd_req(context, &auth_context, p_packet, - NULL, - NULL, NULL, pp_tkt); + NULL, + NULL, NULL, pp_tkt); if (!our_ret) { + DEBUG(10,("ads_secrets_verify_ticket: enc type [%u] decrypted message !\n", - (unsigned int)enctypes[i] )); + (unsigned int)enctypes[i] )); ret = our_ret; break; } - - krb5_free_keyblock_contents(context, keyblock); - + DEBUG((our_ret != KRB5_BAD_ENCTYPE) ? 3 : 10, ("ads_secrets_verify_ticket: enc type [%u] failed to decrypt with error %s\n", (unsigned int)enctypes[i], error_message(our_ret))); @@ -267,8 +311,6 @@ static krb5_error_code ads_secrets_verify_ticket(TALLOC_CTX *mem_ctx, krb5_conte } } - out: - free_kerberos_etypes(context, enctypes); return ret; |