diff options
Diffstat (limited to 'src/plugins/kadm5_auth/test/main.c')
| -rw-r--r-- | src/plugins/kadm5_auth/test/main.c | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/src/plugins/kadm5_auth/test/main.c b/src/plugins/kadm5_auth/test/main.c new file mode 100644 index 0000000..6899f22 --- /dev/null +++ b/src/plugins/kadm5_auth/test/main.c @@ -0,0 +1,305 @@ +/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */ +/* plugins/kadm5_auth/test/main.c - test modules for kadm5_auth interface */ +/* + * Copyright (C) 2017 by the Massachusetts Institute of Technology. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * This file implements two testing kadm5_auth modules, the welcomer and the + * bouncer. The welcomer implements permissive behavior, while the bouncer + * implements restrictive behavior. + * + * Module data objects and restrictions are adequately tested by the acl + * module, so we do not test them here. Focus instead on the ability to + * examine principal and policy objects and to perform DB operations. + */ + +#include "k5-int.h" +#include <kadm5/admin.h> +#include <krb5/kadm5_auth_plugin.h> + +krb5_error_code +kadm5_auth_welcomer_initvt(krb5_context context, int maj_ver, int min_ver, + krb5_plugin_vtable vtable); +krb5_error_code +kadm5_auth_bouncer_initvt(krb5_context context, int maj_ver, int min_ver, + krb5_plugin_vtable vtable); + +/* The welcomer authorizes all getprinc operations, since kadmin uses them as a + * precursor to modprinc. */ +static krb5_error_code +welcomer_getprinc(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, krb5_const_principal target) +{ + return 0; +} + +/* The welcomer authorizes addprinc operations which set a policy "VIP". */ +static krb5_error_code +welcomer_addprinc(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, krb5_const_principal target, + const struct _kadm5_principal_ent_t *ent, long mask, + struct kadm5_auth_restrictions **rs_out) +{ + if ((mask & KADM5_POLICY) && strcmp(ent->policy, "VIP") == 0) + return 0; + return KRB5_PLUGIN_NO_HANDLE; +} + +/* The bouncer denies addprinc operations which include a maximum lifetime. */ +static krb5_error_code +bouncer_addprinc(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, krb5_const_principal target, + const struct _kadm5_principal_ent_t *ent, long mask, + struct kadm5_auth_restrictions **rs_out) +{ + return (mask & KADM5_MAX_LIFE) ? EPERM : KRB5_PLUGIN_NO_HANDLE; +} + +/* The welcomer authorizes modprinc operations which only set maxrenewlife. */ +static krb5_error_code +welcomer_modprinc(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, krb5_const_principal target, + const struct _kadm5_principal_ent_t *ent, long mask, + struct kadm5_auth_restrictions **rs_out) +{ + return (mask == KADM5_MAX_RLIFE) ? 0 : KRB5_PLUGIN_NO_HANDLE; +} + +/* The bouncer denies modprinc operations if the target principal has an even + * number of components. */ +static krb5_error_code +bouncer_modprinc(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, krb5_const_principal target, + const struct _kadm5_principal_ent_t *ent, long mask, + struct kadm5_auth_restrictions **rs_out) +{ + return (target->length % 2 == 0) ? EPERM : KRB5_PLUGIN_NO_HANDLE; +} + +/* The welcomer authorizes setstr operations for the attribute "note". */ +static krb5_error_code +welcomer_setstr(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, krb5_const_principal target, + const char *key, const char *value) +{ + return (strcmp(key, "note") == 0) ? 0 : KRB5_PLUGIN_NO_HANDLE; +} + +/* The bouncer denies setstr operations if the value is more than 10 bytes. */ +static krb5_error_code +bouncer_setstr(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, krb5_const_principal target, + const char *key, const char *value) +{ + return (strlen(value) > 10) ? EPERM : KRB5_PLUGIN_NO_HANDLE; +} + +/* The welcomer authorizes delprinc operations if the target principal starts + * with "d". */ +static krb5_error_code +welcomer_delprinc(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, krb5_const_principal target) +{ + if (target->length > 0 && target->data[0].length > 0 && + *target->data[0].data == 'd') + return 0; + return KRB5_PLUGIN_NO_HANDLE; +} + +/* The bouncer denies delprinc operations if the target principal has the + * "nodelete" string attribute. */ +static krb5_error_code +bouncer_delprinc(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, krb5_const_principal target) +{ + krb5_error_code ret; + krb5_db_entry *ent; + char *val = NULL; + + if (krb5_db_get_principal(context, target, 0, &ent) != 0) + return EPERM; + ret = krb5_dbe_get_string(context, ent, "nodelete", &val); + krb5_db_free_principal(context, ent); + ret = (ret != 0 || val != NULL) ? EPERM : KRB5_PLUGIN_NO_HANDLE; + krb5_dbe_free_string(context, val); + return ret; +} + +/* The welcomer authorizes rename operations if the first components of the + * principals have the same length. */ +static krb5_error_code +welcomer_renprinc(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, krb5_const_principal src, + krb5_const_principal dest) +{ + if (src->length > 0 && dest->length > 0 && + src->data[0].length == dest->data[0].length) + return 0; + return KRB5_PLUGIN_NO_HANDLE; +} + +/* The bouncer denies rename operations if the source principal starts with + * "a". */ +static krb5_error_code +bouncer_renprinc(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, krb5_const_principal src, + krb5_const_principal dest) +{ + if (src->length > 0 && src->data[0].length > 0 && + *src->data[0].data == 'a') + return EPERM; + return KRB5_PLUGIN_NO_HANDLE; +} + +/* The welcomer authorizes addpol operations which set a minlength of 3. */ +static krb5_error_code +welcomer_addpol(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, const char *policy, + const struct _kadm5_policy_ent_t *ent, long mask) +{ + if ((mask & KADM5_PW_MIN_LENGTH) && ent->pw_min_length == 3) + return 0; + return KRB5_PLUGIN_NO_HANDLE; +} + +/* The bouncer denies addpol operations if the name is 3 bytes or less. */ +static krb5_error_code +bouncer_addpol(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, const char *policy, + const struct _kadm5_policy_ent_t *ent, long mask) +{ + return (strlen(policy) <= 3) ? EPERM : KRB5_PLUGIN_NO_HANDLE; +} + +/* The welcomer authorizes modpol operations which only change min_life. */ +static krb5_error_code +welcomer_modpol(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, const char *policy, + const struct _kadm5_policy_ent_t *ent, long mask) +{ + return (mask == KADM5_PW_MIN_LIFE) ? 0 : KRB5_PLUGIN_NO_HANDLE; +} + +/* The bouncer denies modpol operations which set pw_min_life above 10. */ +static krb5_error_code +bouncer_modpol(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, const char *policy, + const struct _kadm5_policy_ent_t *ent, long mask) +{ + if ((mask & KADM5_PW_MIN_LIFE) && ent->pw_min_life > 10) + return EPERM; + return KRB5_PLUGIN_NO_HANDLE; +} + +/* The welcomer authorizes getpol operations if the policy and client principal + * policy have the same length. */ +static krb5_error_code +welcomer_getpol(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, const char *policy, + const char *client_policy) +{ + if (client_policy != NULL && strlen(policy) == strlen(client_policy)) + return 0; + return KRB5_PLUGIN_NO_HANDLE; +} + +/* The bouncer denies getpol operations if the policy name begins with 'x'. */ +static krb5_error_code +bouncer_getpol(krb5_context context, kadm5_auth_moddata data, + krb5_const_principal client, const char *policy, + const char *client_policy) +{ + return (*policy == 'x') ? EPERM : KRB5_PLUGIN_NO_HANDLE; +} + +/* The welcomer counts end calls by incrementing the "ends" string attribute on + * the "opcount" principal, if it exists. */ +static void +welcomer_end(krb5_context context, kadm5_auth_moddata data) +{ + krb5_principal princ = NULL; + krb5_db_entry *ent = NULL; + char *val = NULL, buf[10]; + + if (krb5_parse_name(context, "opcount", &princ) != 0) + goto cleanup; + if (krb5_db_get_principal(context, princ, 0, &ent) != 0) + goto cleanup; + if (krb5_dbe_get_string(context, ent, "ends", &val) != 0 || val == NULL) + goto cleanup; + snprintf(buf, sizeof(buf), "%d", atoi(val) + 1); + if (krb5_dbe_set_string(context, ent, "ends", buf) != 0) + goto cleanup; + ent->mask = KADM5_TL_DATA; + krb5_db_put_principal(context, ent); + +cleanup: + krb5_dbe_free_string(context, val); + krb5_db_free_principal(context, ent); + krb5_free_principal(context, princ); +} + +krb5_error_code +kadm5_auth_welcomer_initvt(krb5_context context, int maj_ver, int min_ver, + krb5_plugin_vtable vtable) +{ + kadm5_auth_vtable vt = (kadm5_auth_vtable)vtable; + + vt->name = "welcomer"; + vt->addprinc = welcomer_addprinc; + vt->modprinc = welcomer_modprinc; + vt->setstr = welcomer_setstr; + vt->delprinc = welcomer_delprinc; + vt->renprinc = welcomer_renprinc; + vt->getprinc = welcomer_getprinc; + vt->addpol = welcomer_addpol; + vt->modpol = welcomer_modpol; + vt->getpol = welcomer_getpol; + vt->end = welcomer_end; + return 0; +} + +krb5_error_code +kadm5_auth_bouncer_initvt(krb5_context context, int maj_ver, int min_ver, + krb5_plugin_vtable vtable) +{ + kadm5_auth_vtable vt = (kadm5_auth_vtable)vtable; + + vt->name = "bouncer"; + vt->addprinc = bouncer_addprinc; + vt->modprinc = bouncer_modprinc; + vt->setstr = bouncer_setstr; + vt->delprinc = bouncer_delprinc; + vt->renprinc = bouncer_renprinc; + vt->addpol = bouncer_addpol; + vt->modpol = bouncer_modpol; + vt->getpol = bouncer_getpol; + return 0; +} |