Daniel P. Berrange | c8c9988 | 2015-10-21 14:54:59 +0100 | [diff] [blame] | 1 | /* |
| 2 | * QEMU access control list 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 |
| 9 | * version 2 of the License, or (at your option) any later version. |
| 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/list.h" |
Markus Armbruster | 45b1f68 | 2019-03-15 15:51:17 +0100 | [diff] [blame] | 23 | #include "trace.h" |
Daniel P. Berrange | c8c9988 | 2015-10-21 14:54:59 +0100 | [diff] [blame] | 24 | #include "qom/object_interfaces.h" |
| 25 | #include "qapi/qapi-visit-authz.h" |
Markus Armbruster | 0b8fa32 | 2019-05-23 16:35:07 +0200 | [diff] [blame] | 26 | #include "qemu/module.h" |
Daniel P. Berrange | c8c9988 | 2015-10-21 14:54:59 +0100 | [diff] [blame] | 27 | |
| 28 | static bool qauthz_list_is_allowed(QAuthZ *authz, |
| 29 | const char *identity, |
| 30 | Error **errp) |
| 31 | { |
| 32 | QAuthZList *lauthz = QAUTHZ_LIST(authz); |
| 33 | QAuthZListRuleList *rules = lauthz->rules; |
| 34 | |
| 35 | while (rules) { |
| 36 | QAuthZListRule *rule = rules->value; |
| 37 | QAuthZListFormat format = rule->has_format ? rule->format : |
| 38 | QAUTHZ_LIST_FORMAT_EXACT; |
| 39 | |
| 40 | trace_qauthz_list_check_rule(authz, rule->match, identity, |
| 41 | format, rule->policy); |
| 42 | switch (format) { |
| 43 | case QAUTHZ_LIST_FORMAT_EXACT: |
| 44 | if (g_str_equal(rule->match, identity)) { |
| 45 | return rule->policy == QAUTHZ_LIST_POLICY_ALLOW; |
| 46 | } |
| 47 | break; |
| 48 | case QAUTHZ_LIST_FORMAT_GLOB: |
| 49 | if (g_pattern_match_simple(rule->match, identity)) { |
| 50 | return rule->policy == QAUTHZ_LIST_POLICY_ALLOW; |
| 51 | } |
| 52 | break; |
| 53 | default: |
| 54 | g_warn_if_reached(); |
| 55 | return false; |
| 56 | } |
| 57 | rules = rules->next; |
| 58 | } |
| 59 | |
| 60 | trace_qauthz_list_default_policy(authz, identity, lauthz->policy); |
| 61 | return lauthz->policy == QAUTHZ_LIST_POLICY_ALLOW; |
| 62 | } |
| 63 | |
| 64 | |
| 65 | static void |
| 66 | qauthz_list_prop_set_policy(Object *obj, |
| 67 | int value, |
| 68 | Error **errp G_GNUC_UNUSED) |
| 69 | { |
| 70 | QAuthZList *lauthz = QAUTHZ_LIST(obj); |
| 71 | |
| 72 | lauthz->policy = value; |
| 73 | } |
| 74 | |
| 75 | |
| 76 | static int |
| 77 | qauthz_list_prop_get_policy(Object *obj, |
| 78 | Error **errp G_GNUC_UNUSED) |
| 79 | { |
| 80 | QAuthZList *lauthz = QAUTHZ_LIST(obj); |
| 81 | |
| 82 | return lauthz->policy; |
| 83 | } |
| 84 | |
| 85 | |
| 86 | static void |
| 87 | qauthz_list_prop_get_rules(Object *obj, Visitor *v, const char *name, |
| 88 | void *opaque, Error **errp) |
| 89 | { |
| 90 | QAuthZList *lauthz = QAUTHZ_LIST(obj); |
| 91 | |
| 92 | visit_type_QAuthZListRuleList(v, name, &lauthz->rules, errp); |
| 93 | } |
| 94 | |
| 95 | static void |
| 96 | qauthz_list_prop_set_rules(Object *obj, Visitor *v, const char *name, |
| 97 | void *opaque, Error **errp) |
| 98 | { |
| 99 | QAuthZList *lauthz = QAUTHZ_LIST(obj); |
| 100 | QAuthZListRuleList *oldrules; |
| 101 | |
| 102 | oldrules = lauthz->rules; |
| 103 | visit_type_QAuthZListRuleList(v, name, &lauthz->rules, errp); |
| 104 | |
| 105 | qapi_free_QAuthZListRuleList(oldrules); |
| 106 | } |
| 107 | |
| 108 | |
| 109 | static void |
| 110 | qauthz_list_finalize(Object *obj) |
| 111 | { |
| 112 | QAuthZList *lauthz = QAUTHZ_LIST(obj); |
| 113 | |
| 114 | qapi_free_QAuthZListRuleList(lauthz->rules); |
| 115 | } |
| 116 | |
| 117 | |
| 118 | static void |
| 119 | qauthz_list_class_init(ObjectClass *oc, void *data) |
| 120 | { |
| 121 | QAuthZClass *authz = QAUTHZ_CLASS(oc); |
| 122 | |
| 123 | object_class_property_add_enum(oc, "policy", |
| 124 | "QAuthZListPolicy", |
| 125 | &QAuthZListPolicy_lookup, |
| 126 | qauthz_list_prop_get_policy, |
Markus Armbruster | d262312 | 2020-05-05 17:29:22 +0200 | [diff] [blame] | 127 | qauthz_list_prop_set_policy); |
Daniel P. Berrange | c8c9988 | 2015-10-21 14:54:59 +0100 | [diff] [blame] | 128 | |
| 129 | object_class_property_add(oc, "rules", "QAuthZListRule", |
| 130 | qauthz_list_prop_get_rules, |
| 131 | qauthz_list_prop_set_rules, |
Markus Armbruster | d262312 | 2020-05-05 17:29:22 +0200 | [diff] [blame] | 132 | NULL, NULL); |
Daniel P. Berrange | c8c9988 | 2015-10-21 14:54:59 +0100 | [diff] [blame] | 133 | |
| 134 | authz->is_allowed = qauthz_list_is_allowed; |
| 135 | } |
| 136 | |
| 137 | |
| 138 | QAuthZList *qauthz_list_new(const char *id, |
| 139 | QAuthZListPolicy policy, |
| 140 | Error **errp) |
| 141 | { |
| 142 | return QAUTHZ_LIST( |
| 143 | object_new_with_props(TYPE_QAUTHZ_LIST, |
| 144 | object_get_objects_root(), |
| 145 | id, errp, |
| 146 | "policy", QAuthZListPolicy_str(policy), |
| 147 | NULL)); |
| 148 | } |
| 149 | |
| 150 | ssize_t qauthz_list_append_rule(QAuthZList *auth, |
| 151 | const char *match, |
| 152 | QAuthZListPolicy policy, |
| 153 | QAuthZListFormat format, |
| 154 | Error **errp) |
| 155 | { |
| 156 | QAuthZListRule *rule; |
| 157 | QAuthZListRuleList *rules, *tmp; |
| 158 | size_t i = 0; |
| 159 | |
| 160 | rule = g_new0(QAuthZListRule, 1); |
| 161 | rule->policy = policy; |
| 162 | rule->match = g_strdup(match); |
| 163 | rule->format = format; |
| 164 | rule->has_format = true; |
| 165 | |
| 166 | tmp = g_new0(QAuthZListRuleList, 1); |
| 167 | tmp->value = rule; |
| 168 | |
| 169 | rules = auth->rules; |
| 170 | if (rules) { |
| 171 | while (rules->next) { |
| 172 | i++; |
| 173 | rules = rules->next; |
| 174 | } |
| 175 | rules->next = tmp; |
| 176 | return i + 1; |
| 177 | } else { |
| 178 | auth->rules = tmp; |
| 179 | return 0; |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | |
| 184 | ssize_t qauthz_list_insert_rule(QAuthZList *auth, |
| 185 | const char *match, |
| 186 | QAuthZListPolicy policy, |
| 187 | QAuthZListFormat format, |
| 188 | size_t index, |
| 189 | Error **errp) |
| 190 | { |
| 191 | QAuthZListRule *rule; |
| 192 | QAuthZListRuleList *rules, *tmp; |
| 193 | size_t i = 0; |
| 194 | |
| 195 | rule = g_new0(QAuthZListRule, 1); |
| 196 | rule->policy = policy; |
| 197 | rule->match = g_strdup(match); |
| 198 | rule->format = format; |
| 199 | rule->has_format = true; |
| 200 | |
| 201 | tmp = g_new0(QAuthZListRuleList, 1); |
| 202 | tmp->value = rule; |
| 203 | |
| 204 | rules = auth->rules; |
| 205 | if (rules && index > 0) { |
| 206 | while (rules->next && i < (index - 1)) { |
| 207 | i++; |
| 208 | rules = rules->next; |
| 209 | } |
| 210 | tmp->next = rules->next; |
| 211 | rules->next = tmp; |
| 212 | return i + 1; |
| 213 | } else { |
| 214 | tmp->next = auth->rules; |
| 215 | auth->rules = tmp; |
| 216 | return 0; |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | |
| 221 | ssize_t qauthz_list_delete_rule(QAuthZList *auth, const char *match) |
| 222 | { |
| 223 | QAuthZListRule *rule; |
| 224 | QAuthZListRuleList *rules, *prev; |
| 225 | size_t i = 0; |
| 226 | |
| 227 | prev = NULL; |
| 228 | rules = auth->rules; |
| 229 | while (rules) { |
| 230 | rule = rules->value; |
| 231 | if (g_str_equal(rule->match, match)) { |
| 232 | if (prev) { |
| 233 | prev->next = rules->next; |
| 234 | } else { |
| 235 | auth->rules = rules->next; |
| 236 | } |
| 237 | rules->next = NULL; |
| 238 | qapi_free_QAuthZListRuleList(rules); |
| 239 | return i; |
| 240 | } |
| 241 | prev = rules; |
| 242 | rules = rules->next; |
| 243 | i++; |
| 244 | } |
| 245 | |
| 246 | return -1; |
| 247 | } |
| 248 | |
| 249 | |
| 250 | static const TypeInfo qauthz_list_info = { |
| 251 | .parent = TYPE_QAUTHZ, |
| 252 | .name = TYPE_QAUTHZ_LIST, |
| 253 | .instance_size = sizeof(QAuthZList), |
| 254 | .instance_finalize = qauthz_list_finalize, |
| 255 | .class_size = sizeof(QAuthZListClass), |
| 256 | .class_init = qauthz_list_class_init, |
| 257 | .interfaces = (InterfaceInfo[]) { |
| 258 | { TYPE_USER_CREATABLE }, |
| 259 | { } |
| 260 | } |
| 261 | }; |
| 262 | |
| 263 | |
| 264 | static void |
| 265 | qauthz_list_register_types(void) |
| 266 | { |
| 267 | type_register_static(&qauthz_list_info); |
| 268 | } |
| 269 | |
| 270 | |
| 271 | type_init(qauthz_list_register_types); |