summaryrefslogtreecommitdiff
path: root/src/services/vyos-http-api-server
blob: aa7ac670858014ddb538cc42e959dcc936fb91cd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
#!/usr/share/vyos-http-api-tools/bin/python3
#
# Copyright (C) 2019-2021 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
#

import os
import sys
import grp
import copy
import json
import logging
import traceback
import threading
from typing import List, Union, Callable, Dict

import uvicorn
from fastapi import FastAPI, Depends, Request, Response, HTTPException
from fastapi.responses import HTMLResponse
from fastapi.exceptions import RequestValidationError
from fastapi.routing import APIRoute
from pydantic import BaseModel, StrictStr, validator
from starlette.datastructures import FormData
from starlette.formparsers import FormParser, MultiPartParser
from multipart.multipart import parse_options_header

from ariadne.asgi import GraphQL

import vyos.config
from vyos.configsession import ConfigSession, ConfigSessionError

import api.graphql.state

DEFAULT_CONFIG_FILE = '/etc/vyos/http-api.conf'
CFG_GROUP = 'vyattacfg'

debug = True

logger = logging.getLogger(__name__)
logs_handler = logging.StreamHandler()
logger.addHandler(logs_handler)

if debug:
    logger.setLevel(logging.DEBUG)
else:
    logger.setLevel(logging.INFO)

# Giant lock!
lock = threading.Lock()

def load_server_config():
    with open(DEFAULT_CONFIG_FILE) as f:
        config = json.load(f)
    return config

def check_auth(key_list, key):
    key_id = None
    for k in key_list:
        if k['key'] == key:
            key_id = k['id']
    return key_id

def error(code, msg):
    resp = {"success": False, "error": msg, "data": None}
    resp = json.dumps(resp)
    return HTMLResponse(resp, status_code=code)

def success(data):
    resp = {"success": True, "data": data, "error": None}
    resp = json.dumps(resp)
    return HTMLResponse(resp)

# Pydantic models for validation
# Pydantic will cast when possible, so use StrictStr
# validators added as needed for additional constraints
# schema_extra adds anotations to OpenAPI, to add examples

class ApiModel(BaseModel):
    key: StrictStr

class BaseConfigureModel(BaseModel):
    op: StrictStr
    path: List[StrictStr]
    value: StrictStr = None

    @validator("path", pre=True, always=True)
    def check_non_empty(cls, path):
        assert len(path) > 0
        return path

class ConfigureModel(ApiModel):
    op: StrictStr
    path: List[StrictStr]
    value: StrictStr = None

    @validator("path", pre=True, always=True)
    def check_non_empty(cls, path):
        assert len(path) > 0
        return path

    class Config:
        schema_extra = {
            "example": {
                "key": "id_key",
                "op": "set | delete | comment",
                "path": ['config', 'mode', 'path'],
            }
        }

class ConfigureListModel(ApiModel):
    commands: List[BaseConfigureModel]

    class Config:
        schema_extra = {
            "example": {
                "key": "id_key",
                "commands": "list of commands",
            }
        }

class RetrieveModel(ApiModel):
    op: StrictStr
    path: List[StrictStr]
    configFormat: StrictStr = None

    class Config:
        schema_extra = {
            "example": {
                "key": "id_key",
                "op": "returnValue | returnValues | exists | showConfig",
                "path": ['config', 'mode', 'path'],
                "configFormat": "json (default) | json_ast | raw",

            }
        }

class ConfigFileModel(ApiModel):
    op: StrictStr
    file: StrictStr = None

    class Config:
        schema_extra = {
            "example": {
                "key": "id_key",
                "op": "save | load",
                "file": "filename",
            }
        }

class ImageModel(ApiModel):
    op: StrictStr
    url: StrictStr = None
    name: StrictStr = None

    class Config:
        schema_extra = {
            "example": {
                "key": "id_key",
                "op": "add | delete",
                "url": "imagelocation",
                "name": "imagename",
            }
        }

class GenerateModel(ApiModel):
    op: StrictStr
    path: List[StrictStr]

    class Config:
        schema_extra = {
            "example": {
                "key": "id_key",
                "op": "generate",
                "path": ["op", "mode", "path"],
            }
        }

class ShowModel(ApiModel):
    op: StrictStr
    path: List[StrictStr]

    class Config:
        schema_extra = {
            "example": {
                "key": "id_key",
                "op": "show",
                "path": ["op", "mode", "path"],
            }
        }

class Success(BaseModel):
    success: bool
    data: Union[str, bool, Dict]
    error: str

class Error(BaseModel):
    success: bool = False
    data: Union[str, bool, Dict]
    error: str

responses = {
    200: {'model': Success},
    400: {'model': Error},
    422: {'model': Error, 'description': 'Validation Error'},
    500: {'model': Error}
}

def auth_required(data: ApiModel):
    key = data.key
    api_keys = app.state.vyos_keys
    key_id = check_auth(api_keys, key)
    if not key_id:
        raise HTTPException(status_code=401, detail="Valid API key is required")
    app.state.vyos_id = key_id

# override Request and APIRoute classes in order to convert form request to json;
# do all explicit validation here, for backwards compatability of error messages;
# the explicit validation may be dropped, if desired, in favor of native
# validation by FastAPI/Pydantic, as is used for application/json requests
class MultipartRequest(Request):
    ERR_MISSING_KEY = False
    ERR_MISSING_DATA = False
    ERR_NOT_JSON = False
    ERR_NOT_DICT = False
    ERR_NO_OP = False
    ERR_NO_PATH = False
    ERR_EMPTY_PATH = False
    ERR_PATH_NOT_LIST = False
    ERR_VALUE_NOT_STRING = False
    ERR_PATH_NOT_LIST_OF_STR = False
    offending_command = {}
    exception = None

    @property
    def orig_headers(self):
        self._orig_headers = super().headers
        return self._orig_headers

    @property
    def headers(self):
        self._headers = super().headers.mutablecopy()
        self._headers['content-type'] = 'application/json'
        return self._headers

    async def form(self) -> FormData:
        if not hasattr(self, "_form"):
            assert (
                parse_options_header is not None
            ), "The `python-multipart` library must be installed to use form parsing."
            content_type_header = self.orig_headers.get("Content-Type")
            content_type, options = parse_options_header(content_type_header)
            if content_type == b"multipart/form-data":
                multipart_parser = MultiPartParser(self.orig_headers, self.stream())
                self._form = await multipart_parser.parse()
            elif content_type == b"application/x-www-form-urlencoded":
                form_parser = FormParser(self.orig_headers, self.stream())
                self._form = await form_parser.parse()
            else:
                self._form = FormData()
        return self._form

    async def body(self) -> bytes:
        if not hasattr(self, "_body"):
            forms = {}
            merge = {}
            body = await super().body()
            self._body = body

            form_data = await self.form()
            if form_data:
                logger.debug("processing form data")
                for k, v in form_data.multi_items():
                    forms[k] = v

                if 'data' not in forms:
                    self.ERR_MISSING_DATA = True
                else:
                    try:
                        tmp = json.loads(forms['data'])
                    except json.JSONDecodeError as e:
                        self.ERR_NOT_JSON = True
                        self.exception = e
                        tmp = {}
                    if isinstance(tmp, list):
                        merge['commands'] = tmp
                    else:
                        merge = tmp

                if 'commands' in merge:
                    cmds = merge['commands']
                else:
                    cmds = copy.deepcopy(merge)
                    cmds = [cmds]

                for c in cmds:
                    if not isinstance(c, dict):
                        self.ERR_NOT_DICT = True
                        self.offending_command = c
                    elif 'op' not in c:
                        self.ERR_NO_OP = True
                        self.offending_command = c
                    elif 'path' not in c:
                        self.ERR_NO_PATH = True
                        self.offending_command = c
                    elif not c['path']:
                        self.ERR_EMPTY_PATH = True
                        self.offending_command = c
                    elif not isinstance(c['path'], list):
                        self.ERR_PATH_NOT_LIST = True
                        self.offending_command = c
                    elif not all(isinstance(el, str) for el in c['path']):
                        self.ERR_PATH_NOT_LIST_OF_STR = True
                        self.offending_command = c
                    elif 'value' in c and not isinstance(c['value'], str):
                        self.ERR_VALUE_NOT_STRING = True
                        self.offending_command = c

                if 'key' not in forms and 'key' not in merge:
                    self.ERR_MISSING_KEY = True
                if 'key' in forms and 'key' not in merge:
                    merge['key'] = forms['key']

                new_body = json.dumps(merge)
                new_body = new_body.encode()
                self._body = new_body

        return self._body

class MultipartRoute(APIRoute):
    def get_route_handler(self) -> Callable:
        original_route_handler = super().get_route_handler()

        async def custom_route_handler(request: Request) -> Response:
            request = MultipartRequest(request.scope, request.receive)
            endpoint = request.url.path
            try:
                response: Response = await original_route_handler(request)
            except HTTPException as e:
                return error(e.status_code, e.detail)
            except Exception as e:
                if request.ERR_MISSING_KEY:
                    return error(422, "Valid API key is required")
                if request.ERR_MISSING_DATA:
                    return error(422, "Non-empty data field is required")
                if request.ERR_NOT_JSON:
                    return error(400, "Failed to parse JSON: {0}".format(request.exception))
                if endpoint == '/configure':
                    if request.ERR_NOT_DICT:
                        return error(400, "Malformed command \"{0}\": any command must be a dict".format(json.dumps(request.offending_command)))
                    if request.ERR_NO_OP:
                        return error(400, "Malformed command \"{0}\": missing \"op\" field".format(json.dumps(request.offending_command)))
                    if request.ERR_NO_PATH:
                        return error(400, "Malformed command \"{0}\": missing \"path\" field".format(json.dumps(request.offending_command)))
                    if request.ERR_EMPTY_PATH:
                        return error(400, "Malformed command \"{0}\": empty path".format(json.dumps(request.offending_command)))
                    if request.ERR_PATH_NOT_LIST:
                        return error(400, "Malformed command \"{0}\": \"path\" field must be a list".format(json.dumps(request.offending_command)))
                    if request.ERR_VALUE_NOT_STRING:
                        return error(400, "Malformed command \"{0}\": \"value\" field must be a string".format(json.dumps(request.offending_command)))
                    if request.ERR_PATH_NOT_LIST_OF_STR:
                        return error(400, "Malformed command \"{0}\": \"path\" field must be a list of strings".format(json.dumps(request.offending_command)))
                if endpoint in ('/retrieve','/generate','/show'):
                    if request.ERR_NO_OP or request.ERR_NO_PATH:
                        return error(400, "Missing required field. \"op\" and \"path\" fields are required")
                if endpoint in ('/config-file', '/image'):
                    if request.ERR_NO_OP:
                        return error(400, "Missing required field \"op\"")

                raise e

            return response

        return custom_route_handler

app = FastAPI(debug=True,
              title="VyOS API",
              version="0.1.0",
              responses={**responses},
              dependencies=[Depends(auth_required)])

app.router.route_class = MultipartRoute

@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request, exc):
    return error(400, str(exc.errors()[0]))

@app.post('/configure')
def configure_op(data: Union[ConfigureModel, ConfigureListModel]):
    session = app.state.vyos_session
    env = session.get_session_env()
    config = vyos.config.Config(session_env=env)

    # Allow users to pass just one command
    if not isinstance(data, ConfigureListModel):
        data = [data]
    else:
        data = data.commands

    # We don't want multiple people/apps to be able to commit at once,
    # or modify the shared session while someone else is doing the same,
    # so the lock is really global
    lock.acquire()

    status = 200
    error_msg = None
    try:
        for c in data:
            op = c.op
            path = c.path

            if c.value:
                value = c.value
            else:
                value = ""

            # For vyos.configsession calls that have no separate value arguments,
            # and for type checking too
            cfg_path = " ".join(path + [value]).strip()

            if op == 'set':
                # XXX: it would be nice to do a strict check for "path already exists",
                # but there's probably no way to do that
                session.set(path, value=value)
            elif op == 'delete':
                if app.state.vyos_strict and not config.exists(cfg_path):
                    raise ConfigSessionError("Cannot delete [{0}]: path/value does not exist".format(cfg_path))
                session.delete(path, value=value)
            elif op == 'comment':
                session.comment(path, value=value)
            else:
                raise ConfigSessionError("\"{0}\" is not a valid operation".format(op))
        # end for
        session.commit()
        logger.info(f"Configuration modified via HTTP API using key '{app.state.vyos_id}'")
    except ConfigSessionError as e:
        session.discard()
        status = 400
        if app.state.vyos_debug:
            logger.critical(f"ConfigSessionError:\n {traceback.format_exc()}")
        error_msg = str(e)
    except Exception as e:
        session.discard()
        logger.critical(traceback.format_exc())
        status = 500

        # Don't give the details away to the outer world
        error_msg = "An internal error occured. Check the logs for details."
    finally:
        lock.release()

    if status != 200:
        return error(status, error_msg)

    return success(None)

@app.post("/retrieve")
def retrieve_op(data: RetrieveModel):
    session = app.state.vyos_session
    env = session.get_session_env()
    config = vyos.config.Config(session_env=env)

    op = data.op
    path = " ".join(data.path)

    try:
        if op == 'returnValue':
            res = config.return_value(path)
        elif op == 'returnValues':
            res = config.return_values(path)
        elif op == 'exists':
            res = config.exists(path)
        elif op == 'showConfig':
            config_format = 'json'
            if data.configFormat:
                config_format = data.configFormat

            res = session.show_config(path=data.path)
            if config_format == 'json':
                config_tree = vyos.configtree.ConfigTree(res)
                res = json.loads(config_tree.to_json())
            elif config_format == 'json_ast':
                config_tree = vyos.configtree.ConfigTree(res)
                res = json.loads(config_tree.to_json_ast())
            elif config_format == 'raw':
                pass
            else:
                return error(400, "\"{0}\" is not a valid config format".format(config_format))
        else:
            return error(400, "\"{0}\" is not a valid operation".format(op))
    except ConfigSessionError as e:
        return error(400, str(e))
    except Exception as e:
        logger.critical(traceback.format_exc())
        return error(500, "An internal error occured. Check the logs for details.")

    return success(res)

@app.post('/config-file')
def config_file_op(data: ConfigFileModel):
    session = app.state.vyos_session

    op = data.op

    try:
        if op == 'save':
            if data.file:
                path = data.file
            else:
                path = '/config/config.boot'
            res = session.save_config(path)
        elif op == 'load':
            if data.file:
                path = data.file
            else:
                return error(400, "Missing required field \"file\"")
            res = session.migrate_and_load_config(path)
            res = session.commit()
        else:
            return error(400, "\"{0}\" is not a valid operation".format(op))
    except ConfigSessionError as e:
        return error(400, str(e))
    except Exception as e:
        logger.critical(traceback.format_exc())
        return error(500, "An internal error occured. Check the logs for details.")

    return success(res)

@app.post('/image')
def image_op(data: ImageModel):
    session = app.state.vyos_session

    op = data.op

    try:
        if op == 'add':
            if data.url:
                url = data.url
            else:
                return error(400, "Missing required field \"url\"")
            res = session.install_image(url)
        elif op == 'delete':
            if data.name:
                name = data.name
            else:
                return error(400, "Missing required field \"name\"")
            res = session.remove_image(name)
        else:
            return error(400, "\"{0}\" is not a valid operation".format(op))
    except ConfigSessionError as e:
        return error(400, str(e))
    except Exception as e:
        logger.critical(traceback.format_exc())
        return error(500, "An internal error occured. Check the logs for details.")

    return success(res)

@app.post('/generate')
def generate_op(data: GenerateModel):
    session = app.state.vyos_session

    op = data.op
    path = data.path

    try:
        if op == 'generate':
            res = session.generate(path)
        else:
            return error(400, "\"{0}\" is not a valid operation".format(op))
    except ConfigSessionError as e:
        return error(400, str(e))
    except Exception as e:
        logger.critical(traceback.format_exc())
        return error(500, "An internal error occured. Check the logs for details.")

    return success(res)

@app.post('/show')
def show_op(data: ShowModel):
    session = app.state.vyos_session

    op = data.op
    path = data.path

    try:
        if op == 'show':
            res = session.show(path)
        else:
            return error(400, "\"{0}\" is not a valid operation".format(op))
    except ConfigSessionError as e:
        return error(400, str(e))
    except Exception as e:
        logger.critical(traceback.format_exc())
        return error(500, "An internal error occured. Check the logs for details.")

    return success(res)

###
# GraphQL integration
###

from api.graphql.bindings import generate_schema

api.graphql.state.init()

schema = generate_schema()

app.add_route('/graphql', GraphQL(schema, debug=True))

###

if __name__ == '__main__':
    # systemd's user and group options don't work, do it by hand here,
    # else no one else will be able to commit
    cfg_group = grp.getgrnam(CFG_GROUP)
    os.setgid(cfg_group.gr_gid)

    # Need to set file permissions to 775 too so that every vyattacfg group member
    # has write access to the running config
    os.umask(0o002)

    try:
        server_config = load_server_config()
    except Exception as err:
        logger.critical(f"Failed to load the HTTP API server config: {err}")

    config_session = ConfigSession(os.getpid())

    app.state.vyos_session = config_session
    app.state.vyos_keys = server_config['api_keys']

    app.state.vyos_debug = bool(server_config['debug'] == 'true')
    app.state.vyos_strict = bool(server_config['strict'] == 'true')

    api.graphql.state.settings['app'] = app

    try:
        uvicorn.run(app, host=server_config["listen_address"],
                         port=int(server_config["port"]),
                         proxy_headers=True)
    except OSError as err:
        logger.critical(f"OSError {err}")
        sys.exit(1)