Daniel P. Berrange | 8953caf | 2016-07-27 14:13:56 +0100 | [diff] [blame] | 1 | /* |
| 2 | * QEMU PAM authorization driver |
| 3 | * |
| 4 | * Copyright (c) 2018 Red Hat, Inc. |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
Chetan Pant | 036a80c | 2020-10-14 13:49:02 +0000 | [diff] [blame] | 9 | * version 2.1 of the License, or (at your option) any later version. |
Daniel P. Berrange | 8953caf | 2016-07-27 14:13:56 +0100 | [diff] [blame] | 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | #include "qemu/osdep.h" |
| 22 | #include "authz/pamacct.h" |
Markus Armbruster | 45b1f68 | 2019-03-15 15:51:17 +0100 | [diff] [blame] | 23 | #include "trace.h" |
Markus Armbruster | 0b8fa32 | 2019-05-23 16:35:07 +0200 | [diff] [blame] | 24 | #include "qemu/module.h" |
Daniel P. Berrange | 8953caf | 2016-07-27 14:13:56 +0100 | [diff] [blame] | 25 | #include "qom/object_interfaces.h" |
| 26 | |
| 27 | #include <security/pam_appl.h> |
| 28 | |
| 29 | |
| 30 | static bool qauthz_pam_is_allowed(QAuthZ *authz, |
| 31 | const char *identity, |
| 32 | Error **errp) |
| 33 | { |
| 34 | QAuthZPAM *pauthz = QAUTHZ_PAM(authz); |
| 35 | const struct pam_conv pam_conversation = { 0 }; |
| 36 | pam_handle_t *pamh = NULL; |
| 37 | int ret; |
| 38 | |
| 39 | trace_qauthz_pam_check(authz, identity, pauthz->service); |
| 40 | ret = pam_start(pauthz->service, |
| 41 | identity, |
| 42 | &pam_conversation, |
| 43 | &pamh); |
| 44 | if (ret != PAM_SUCCESS) { |
| 45 | error_setg(errp, "Unable to start PAM transaction: %s", |
| 46 | pam_strerror(NULL, ret)); |
| 47 | return false; |
| 48 | } |
| 49 | |
| 50 | ret = pam_acct_mgmt(pamh, PAM_SILENT); |
| 51 | pam_end(pamh, ret); |
| 52 | if (ret != PAM_SUCCESS) { |
| 53 | error_setg(errp, "Unable to authorize user '%s': %s", |
| 54 | identity, pam_strerror(pamh, ret)); |
| 55 | return false; |
| 56 | } |
| 57 | |
| 58 | return true; |
| 59 | } |
| 60 | |
| 61 | |
| 62 | static void |
| 63 | qauthz_pam_prop_set_service(Object *obj, |
| 64 | const char *service, |
| 65 | Error **errp G_GNUC_UNUSED) |
| 66 | { |
| 67 | QAuthZPAM *pauthz = QAUTHZ_PAM(obj); |
| 68 | |
| 69 | g_free(pauthz->service); |
| 70 | pauthz->service = g_strdup(service); |
| 71 | } |
| 72 | |
| 73 | |
| 74 | static char * |
| 75 | qauthz_pam_prop_get_service(Object *obj, |
| 76 | Error **errp G_GNUC_UNUSED) |
| 77 | { |
| 78 | QAuthZPAM *pauthz = QAUTHZ_PAM(obj); |
| 79 | |
| 80 | return g_strdup(pauthz->service); |
| 81 | } |
| 82 | |
| 83 | |
| 84 | static void |
| 85 | qauthz_pam_complete(UserCreatable *uc, Error **errp) |
| 86 | { |
Kevin Wolf | 3428455 | 2020-11-17 17:30:44 +0100 | [diff] [blame] | 87 | QAuthZPAM *pauthz = QAUTHZ_PAM(uc); |
| 88 | |
| 89 | if (!pauthz->service) { |
| 90 | error_setg(errp, "The 'service' property must be set"); |
| 91 | return; |
| 92 | } |
Daniel P. Berrange | 8953caf | 2016-07-27 14:13:56 +0100 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | |
| 96 | static void |
| 97 | qauthz_pam_finalize(Object *obj) |
| 98 | { |
| 99 | QAuthZPAM *pauthz = QAUTHZ_PAM(obj); |
| 100 | |
| 101 | g_free(pauthz->service); |
| 102 | } |
| 103 | |
| 104 | |
| 105 | static void |
| 106 | qauthz_pam_class_init(ObjectClass *oc, void *data) |
| 107 | { |
| 108 | UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); |
| 109 | QAuthZClass *authz = QAUTHZ_CLASS(oc); |
| 110 | |
| 111 | ucc->complete = qauthz_pam_complete; |
| 112 | authz->is_allowed = qauthz_pam_is_allowed; |
| 113 | |
| 114 | object_class_property_add_str(oc, "service", |
| 115 | qauthz_pam_prop_get_service, |
Markus Armbruster | d262312 | 2020-05-05 17:29:22 +0200 | [diff] [blame] | 116 | qauthz_pam_prop_set_service); |
Daniel P. Berrange | 8953caf | 2016-07-27 14:13:56 +0100 | [diff] [blame] | 117 | } |
| 118 | |
| 119 | |
| 120 | QAuthZPAM *qauthz_pam_new(const char *id, |
| 121 | const char *service, |
| 122 | Error **errp) |
| 123 | { |
| 124 | return QAUTHZ_PAM( |
| 125 | object_new_with_props(TYPE_QAUTHZ_PAM, |
| 126 | object_get_objects_root(), |
| 127 | id, errp, |
| 128 | "service", service, |
| 129 | NULL)); |
| 130 | } |
| 131 | |
| 132 | |
| 133 | static const TypeInfo qauthz_pam_info = { |
| 134 | .parent = TYPE_QAUTHZ, |
| 135 | .name = TYPE_QAUTHZ_PAM, |
| 136 | .instance_size = sizeof(QAuthZPAM), |
| 137 | .instance_finalize = qauthz_pam_finalize, |
Daniel P. Berrange | 8953caf | 2016-07-27 14:13:56 +0100 | [diff] [blame] | 138 | .class_init = qauthz_pam_class_init, |
| 139 | .interfaces = (InterfaceInfo[]) { |
| 140 | { TYPE_USER_CREATABLE }, |
| 141 | { } |
| 142 | } |
| 143 | }; |
| 144 | |
| 145 | |
| 146 | static void |
| 147 | qauthz_pam_register_types(void) |
| 148 | { |
| 149 | type_register_static(&qauthz_pam_info); |
| 150 | } |
| 151 | |
| 152 | |
| 153 | type_init(qauthz_pam_register_types); |