Getting started

This guide provides the basic information you need to start using the Wazuh API.

Starting and stopping the API

The API starts at boot time. To control or check the wazuh-api service, use the systemctl or service command.

Systemd systems

# systemctl start/status/stop/restart wazuh-api

SysVinit systems

# service wazuh-api start/status/stop/restart

Use the cURL command to send a request to confirm that everything is working as expected:

# curl -u foo:bar "http://localhost:55000?pretty"
{
    "error": 0,
    "data": {
        "msg": "Welcome to Wazuh HIDS API",
        "api_version": "v3.7.0",
        "hostname": "wazuh",
        "timestamp": "Fri Aug 03 2018 00:36:13 GMT+0000 (UTC)"
    }
}

Explanation:

  • curl: A command-line tool for sending requests and commands over HTTP and HTTPS.
  • -u foo:bar: The username and password to authenticate with the API.
  • http://localhost:55000: The API URL to use if you are running the command on the manager itself.
  • ?pretty: The parameter that makes the JSON output more human-readable.

Basic concepts

Here are some of the basic concepts related to making API requests and understanding their responses:

  • The base URL for each request is https://IP:55000/ or http://IP:55000/, depending on whether or not SSL is enabled and set up in the API.

  • All responses are in JSON format with the following structure:

    Field Description
    error 0 if everything was fine and an error code otherwise.
    data The data requested. Only if error is equal to 0.
    message The error description. Only if error is other than 0.
  • Example response without errors:
{
    "error":0,
    "data":{
        "msg":"Welcome to Wazuh HIDS API",
        "api_version":"v3.7.0",
        "hostname":"wazuh",
        "timestamp":"Fri Aug 03 2018 00:37:50 GMT+0000 (UTC)"
    }
}
  • Example response with errors:
{ "error": "603", "message": "The requested URL was not found on this server" }
  • Responses containing collections of data will return a maximum of 500 elements. The offset and limit parameters may be used to iterate through large collections.
  • All responses have an HTTP status code: 2xx (success), 4xx (client error), 5xx (server error), etc.
  • All requests accept the parameter pretty to convert the JSON response to a more human-readable format.
  • The API log is stored on the manager as /var/ossec/logs/api.log. The API logs are rotated daily. The rotations are stored in /var/ossec/logs/api/<year>/<month> and compressed using gzip.

Use cases

This section will present several use cases to give you a taste for the API’s potential. You can find details about all possible API requests in the reference section.

Exploring the ruleset

Often when an alert fires, it is helpful to know details about the rule itself. The following request enumerates the attributes of rule 1002:

# curl -u foo:bar "http://localhost:55000/rules/1002?pretty"
{
   "error": 0,
   "data": {
      "totalItems": 1,
      "items": [
         {
            "status": "enabled",
            "pci": [],
            "description": "Unknown problem somewhere in the system.",
            "file": "0020-syslog_rules.xml",
            "level": 2,
            "path": "/var/ossec/ruleset/rules",
            "details": {
               "match": "$BAD_WORDS"
            },
            "groups": [
               "gpg13_4.3",
               "syslog",
               "errors"
            ],
            "id": 1002,
            "gdpr": []
         }
      ]
   }
}

It can also be helpful to know what rules are available that match a specific criteria. For example, all the rules with a group of web, a PCI tag of 10.6.1, and containing the word failures can be showed using the command bellow:

# curl -u foo:bar "http://localhost:55000/rules?group=web&pci=10.6.1&search=failures&pretty"
{
   "error": 0,
   "data": {
      "totalItems": 1,
      "items": [
         {
            "status": "enabled",
            "pci": [
               "10.6.1",
               "10.2.4",
               "10.2.5",
               "11.4"
            ],
            "description": "Nginx: Multiple web authentication failures.",
            "file": "0260-nginx_rules.xml",
            "level": 10,
            "path": "/var/ossec/ruleset/rules",
            "details": {
               "same_source_ip": "",
               "frequency": "8",
               "if_matched_sid": "31315",
               "timeframe": "240"
            },
            "groups": [
               "authentication_failures",
               "gpg13_7.1",
               "nginx",
               "web"
            ],
            "id": 31316,
            "gdpr": [
               "IV_35.7.d",
               "IV_32.2"
            ]
         }
      ]
   }
}

Mining the file integrity monitoring database of an agent

The API can be used to show information about all monitored files by syscheck. The following example shows all modified .py files in agent 000 (the manager):

# curl -u foo:bar "http://localhost:55000/syscheck/000?event=modified&search=.py&pretty"
{
    "error": 0,
    "data": {
        "totalItems": 2,
        "items": [
            {
                "sha1": "67b0a8ccf18bf5d2eb8c7f214b5a5d0d4a5e409d",
                "group": "root",
                "uid": 0,
                "scanDate": "2018-08-02 16:49:47",
                "gid": 0,
                "user": "root",
                "file": "/etc/python2.7/sitecustomize.py",
                "modificationDate": "2018-04-15 21:51:34",
                "octalMode": "100644",
                "permissions": "-rw-r--r--",
                "md5": "d6b276695157bde06a56ba1b2bc53670",
                "inode": 536845,
                "event": "modified",
                "size": 155
            },
            {
                "sha1": "67b0a8ccf18bf5d2eb8c7f214b5a5d0d4a5e409d",
                "group": "root",
                "uid": 0,
                "scanDate": "2018-08-02 16:49:33",
                "gid": 0,
                "user": "root",
                "file": "/etc/python3.6/sitecustomize.py",
                "modificationDate": "2018-04-01 05:46:30",
                "octalMode": "100644",
                "permissions": "-rw-r--r--",
                "md5": "d6b276695157bde06a56ba1b2bc53670",
                "inode": 394698,
                "event": "modified",
                "size": 155
            }
        ]
    }
}

You can find a file using its md5/sha1 hash. In the following examples, the same file is retrieved using both its md5 and sha1:

# curl -u foo:bar "http://localhost:55000/syscheck/000?pretty&hash=17f51705df5b61c53ef600fc1fcbe031e4d53c20"
{
   "error": 0,
   "data": {
      "totalItems": 1,
      "items": [
         {
            "sha1": "17f51705df5b61c53ef600fc1fcbe031e4d53c20",
            "group": "root",
            "uid": 0,
            "scanDate": "2018-08-02 16:50:12",
            "gid": 0,
            "user": "root",
            "file": "/sbin/swapon",
            "modificationDate": "2018-03-15 22:47:34",
            "octalMode": "100755",
            "permissions": "-rwxr-xr-x",
            "md5": "39b88ab3ddfaf00db53e5cf193051351",
            "inode": 584,
            "event": "modified",
            "size": 47184
         }
      ]
   }
}
# curl -u foo:bar "http://localhost:55000/syscheck/000?pretty&hash=39b88ab3ddfaf00db53e5cf193051351"
{
   "error": 0,
   "data": {
      "totalItems": 1,
      "items": [
         {
            "sha1": "17f51705df5b61c53ef600fc1fcbe031e4d53c20",
            "group": "root",
            "uid": 0,
            "scanDate": "2018-08-02 16:50:12",
            "gid": 0,
            "user": "root",
            "file": "/sbin/swapon",
            "modificationDate": "2018-03-15 22:47:34",
            "octalMode": "100755",
            "permissions": "-rwxr-xr-x",
            "md5": "39b88ab3ddfaf00db53e5cf193051351",
            "inode": 584,
            "event": "modified",
            "size": 47184
         }
      ]
   }
}

Listing outstanding rootcheck issues

Rootcheck requests are very similar to the syscheck requests. In order to get all rootcheck issues with the outstanding status, run this request:

# curl -u foo:bar "http://localhost:55000/rootcheck/000?status=outstanding&offset=10&limit=1&pretty"
{
   "error": 0,
   "data": {
      "totalItems": 14,
      "items": [
         {
            "status": "outstanding",
            "oldDay": "2018-08-02 16:50:41",
            "pci": "2.2.4",
            "readDay": "2018-08-03 00:27:29",
            "event": "System Audit: SSH Hardening - 6: Empty passwords allowed {PCI_DSS: 2.2.4}. File: /etc/ssh/sshd_config. Reference: 6 ."
         }
      ]
   }
}

Getting information about the manager

Some information about the manager can be retrieved using the API. Configuration, status, information, logs, etc. The following example retrieves the status of each daemon Wazuh runs:

# curl -u foo:bar "http://localhost:55000/manager/status?pretty"
{
    "error": 0,
    "data": {
      "wazuh-modulesd": "running",
      "ossec-authd": "stopped",
      "wazuh-clusterd": "running",
      "ossec-monitord": "running",
      "ossec-logcollector": "running",
      "ossec-execd": "running",
      "ossec-remoted": "running",
      "ossec-syscheckd": "running",
      "ossec-analysisd": "running",
      "ossec-maild": "stopped"
    }
}

You can even dump the manager’s current configuration with the request bellow (response shortened for brevity):

# curl -u foo:bar "http://localhost:55000/manager/configuration?pretty"
{
  "error": 0,
  "data": {
    "global": {
      "email_notification": "no",
      "white_list": [
        "127.0.0.1",
        "^localhost.localdomain$",
        "10.0.0.2"
      ],
      "jsonout_output": "yes",
      "logall": "yes"
    },
    "...": {"...": "..."}
  }
}

Playing with agents

Here are some commands for working with the agents.

This enumerates active agents:

# curl -u foo:bar "http://localhost:55000/agents?offset=1&limit=1&status=active&pretty"
{
   "error": 0,
   "data": {
      "totalItems": 2,
      "items": [
         {
            "status": "Active",
            "configSum": "ab73af41699f13fdd81903b5f23d8d00",
            "group": "default",
            "name": "ubuntu",
            "mergedSum": "f1a9e24e02ba4cc5ea80a9d3feb3bb9a",
            "ip": "192.168.185.7",
            "node_name": "node01",
            "dateAdd": "2018-08-02 16:52:04",
            "version": "Wazuh v3.7.0",
            "key": "ac7b7eddf95d65374cb82003024096effa8d90789d447805c375427cb62c75a2",
            "manager_host": "wazuh",
            "lastKeepAlive": "2018-08-03 01:27:33",
            "os": {
               "major": "16",
               "name": "Ubuntu",
               "uname": "Linux |ubuntu |4.4.0-131-generic |#157-Ubuntu SMP Thu Jul 12 15:51:36 UTC 2018 |x86_64",
               "platform": "ubuntu",
               "version": "16.04.5 LTS",
               "codename": "Xenial Xerus",
               "arch": "x86_64",
               "minor": "04"
            },
            "id": "001"
         }
      ]
   }
}

Adding an agent is now easier than ever. Simply send a request with the agent name and its IP.

# curl -u foo:bar -X POST -d '{"name":"NewHost","ip":"10.0.0.9"}' -H 'Content-Type:application/json' "http://localhost:55000/agents?pretty"
{
    "error": 0,
    "data": {
      "id": "007",
      "key": "MDA3IE5ld0hvc3QgMTAuMC4wLjkgYzc2YmZiOTEyYzI0MmMyYzFmMjY2ZTZiMzMyMDM4OTlkMzQ5M2E3OTRkOTMyMDU1MzAzZTE3ZDBkN2I0MmM5Yw=="
    }
}

Conclusion

We hope those examples have helped you to appreciate the potential of the Wazuh API. Remember to check out the reference document to discover all the available API requests. A nice summary can also be found here: summary.