suricata
output-json-krb5.c
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1 /* Copyright (C) 2018 Open Information Security Foundation
2  *
3  * You can copy, redistribute or modify this Program under the terms of
4  * the GNU General Public License version 2 as published by the Free
5  * Software Foundation.
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10  * GNU General Public License for more details.
11  *
12  * You should have received a copy of the GNU General Public License
13  * version 2 along with this program; if not, write to the Free Software
14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
15  * 02110-1301, USA.
16  */
17 
18 /**
19  * \file
20  *
21  * \author Pierre Chifflier <chifflier@wzdftpd.net>
22  *
23  * Implement JSON/eve logging app-layer KRB5.
24  */
25 
26 #include "suricata-common.h"
27 #include "debug.h"
28 #include "detect.h"
29 #include "pkt-var.h"
30 #include "conf.h"
31 
32 #include "threads.h"
33 #include "threadvars.h"
34 #include "tm-threads.h"
35 
36 #include "util-unittest.h"
37 #include "util-buffer.h"
38 #include "util-debug.h"
39 #include "util-byte.h"
40 
41 #include "output.h"
42 #include "output-json.h"
43 
44 #include "app-layer.h"
45 #include "app-layer-parser.h"
46 
47 #include "app-layer-krb5.h"
48 #include "output-json-krb5.h"
49 
50 #ifdef HAVE_RUST
51 #ifdef HAVE_LIBJANSSON
52 
53 #include "rust.h"
54 #include "rust-krb-log-gen.h"
55 
56 typedef struct LogKRB5FileCtx_ {
57  LogFileCtx *file_ctx;
58  OutputJsonCommonSettings cfg;
59 } LogKRB5FileCtx;
60 
61 typedef struct LogKRB5LogThread_ {
62  LogKRB5FileCtx *krb5log_ctx;
63  MemBuffer *buffer;
64 } LogKRB5LogThread;
65 
66 static int JsonKRB5Logger(ThreadVars *tv, void *thread_data,
67  const Packet *p, Flow *f, void *state, void *tx, uint64_t tx_id)
68 {
69  KRB5Transaction *krb5tx = tx;
70  LogKRB5LogThread *thread = thread_data;
71  json_t *js, *krb5js;
72 
73  js = CreateJSONHeader(p, LOG_DIR_PACKET, "krb5");
74  if (unlikely(js == NULL)) {
75  return TM_ECODE_FAILED;
76  }
77 
78  JsonAddCommonOptions(&thread->krb5log_ctx->cfg, p, f, js);
79 
80  krb5js = rs_krb5_log_json_response(state, krb5tx);
81  if (unlikely(krb5js == NULL)) {
82  goto error;
83  }
84  json_object_set_new(js, "krb5", krb5js);
85 
86  MemBufferReset(thread->buffer);
87  OutputJSONBuffer(js, thread->krb5log_ctx->file_ctx, &thread->buffer);
88 
89  json_decref(js);
90  return TM_ECODE_OK;
91 
92 error:
93  json_decref(js);
94  return TM_ECODE_FAILED;
95 }
96 
97 static void OutputKRB5LogDeInitCtxSub(OutputCtx *output_ctx)
98 {
99  LogKRB5FileCtx *krb5log_ctx = (LogKRB5FileCtx *)output_ctx->data;
100  SCFree(krb5log_ctx);
101  SCFree(output_ctx);
102 }
103 
104 static OutputInitResult OutputKRB5LogInitSub(ConfNode *conf,
105  OutputCtx *parent_ctx)
106 {
107  OutputInitResult result = { NULL, false };
108  OutputJsonCtx *ajt = parent_ctx->data;
109 
110  LogKRB5FileCtx *krb5log_ctx = SCCalloc(1, sizeof(*krb5log_ctx));
111  if (unlikely(krb5log_ctx == NULL)) {
112  return result;
113  }
114  krb5log_ctx->file_ctx = ajt->file_ctx;
115  krb5log_ctx->cfg = ajt->cfg;
116 
117  OutputCtx *output_ctx = SCCalloc(1, sizeof(*output_ctx));
118  if (unlikely(output_ctx == NULL)) {
119  SCFree(krb5log_ctx);
120  return result;
121  }
122  output_ctx->data = krb5log_ctx;
123  output_ctx->DeInit = OutputKRB5LogDeInitCtxSub;
124 
125  SCLogDebug("KRB5 log sub-module initialized.");
126 
129 
130  result.ctx = output_ctx;
131  result.ok = true;
132  return result;
133 }
134 
135 #define OUTPUT_BUFFER_SIZE 65535
136 
137 static TmEcode JsonKRB5LogThreadInit(ThreadVars *t, const void *initdata, void **data)
138 {
139  LogKRB5LogThread *thread = SCCalloc(1, sizeof(*thread));
140  if (unlikely(thread == NULL)) {
141  return TM_ECODE_FAILED;
142  }
143 
144  if (initdata == NULL) {
145  SCLogDebug("Error getting context for EveLogKRB5. \"initdata\" is NULL.");
146  SCFree(thread);
147  return TM_ECODE_FAILED;
148  }
149 
150  thread->buffer = MemBufferCreateNew(OUTPUT_BUFFER_SIZE);
151  if (unlikely(thread->buffer == NULL)) {
152  SCFree(thread);
153  return TM_ECODE_FAILED;
154  }
155 
156  thread->krb5log_ctx = ((OutputCtx *)initdata)->data;
157  *data = (void *)thread;
158 
159  return TM_ECODE_OK;
160 }
161 
162 static TmEcode JsonKRB5LogThreadDeinit(ThreadVars *t, void *data)
163 {
164  LogKRB5LogThread *thread = (LogKRB5LogThread *)data;
165  if (thread == NULL) {
166  return TM_ECODE_OK;
167  }
168  if (thread->buffer != NULL) {
169  MemBufferFree(thread->buffer);
170  }
171  SCFree(thread);
172  return TM_ECODE_OK;
173 }
174 
175 void JsonKRB5LogRegister(void)
176 {
177  /* Register as an eve sub-module. */
178  OutputRegisterTxSubModule(LOGGER_JSON_KRB5, "eve-log", "JsonKRB5Log",
179  "eve-log.krb5", OutputKRB5LogInitSub, ALPROTO_KRB5,
180  JsonKRB5Logger, JsonKRB5LogThreadInit,
181  JsonKRB5LogThreadDeinit, NULL);
182 
183  SCLogDebug("KRB5 JSON logger registered.");
184 }
185 
186 #else /* No JSON support. */
187 
188 void JsonKRB5LogRegister(void)
189 {
190 }
191 
192 #endif /* HAVE_LIBJANSSON */
193 #else /* No rust support. */
194 
196 {
197 }
198 
199 #endif /* HAVE_RUST */
void JsonKRB5LogRegister(void)
MemBuffer * MemBufferCreateNew(uint32_t size)
Definition: util-buffer.c:32
#define SCLogDebug(...)
Definition: util-debug.h:335
#define unlikely(expr)
Definition: util-optimize.h:35
#define MemBufferReset(mem_buffer)
Reset the mem buffer.
Definition: util-buffer.h:42
void(* DeInit)(struct OutputCtx_ *)
Definition: tm-modules.h:84
#define SCCalloc(nm, a)
Definition: util-mem.h:197
void AppLayerParserRegisterLogger(uint8_t ipproto, AppProto alproto)
void OutputRegisterTxSubModule(LoggerId id, const char *parent_name, const char *name, const char *conf_name, OutputInitSubFunc InitFunc, AppProto alproto, TxLogger TxLogFunc, ThreadInitFunc ThreadInit, ThreadDeinitFunc ThreadDeinit, ThreadExitPrintStatsFunc ThreadExitPrintStats)
Definition: output.c:397
Definition: conf.h:32
OutputCtx * ctx
Definition: output.h:42
#define SCFree(a)
Definition: util-mem.h:228
uint16_t tx_id
void * data
Definition: tm-modules.h:81
Per thread variable structure.
Definition: threadvars.h:57
struct KRB5Transaction_ KRB5Transaction
#define OUTPUT_BUFFER_SIZE
Definition: log-httplog.c:58
Flow data structure.
Definition: flow.h:324
void MemBufferFree(MemBuffer *buffer)
Definition: util-buffer.c:82