view_sign.go

Documentation: github.com/sassoftware/relic/server

     1  //
     2  // Copyright (c) SAS Institute Inc.
     3  //
     4  // Licensed under the Apache License, Version 2.0 (the "License");
     5  // you may not use this file except in compliance with the License.
     6  // You may obtain a copy of the License at
     7  //
     8  //     http://www.apache.org/licenses/LICENSE-2.0
     9  //
    10  // Unless required by applicable law or agreed to in writing, software
    11  // distributed under the License is distributed on an "AS IS" BASIS,
    12  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  // See the License for the specific language governing permissions and
    14  // limitations under the License.
    15  //
    16  
    17  package server
    18  
    19  import (
    20  	"crypto"
    21  	"fmt"
    22  	"net/http"
    23  
    24  	"github.com/sassoftware/relic/internal/signinit"
    25  	"github.com/sassoftware/relic/lib/readercounter"
    26  	"github.com/sassoftware/relic/lib/x509tools"
    27  	"github.com/sassoftware/relic/signers"
    28  )
    29  
    30  const defaultHash = crypto.SHA256
    31  
    32  func (s *Server) serveSign(request *http.Request, writer http.ResponseWriter) (res Response, err error) {
    33  	if request.Method != "POST" {
    34  		return ErrorResponse(http.StatusMethodNotAllowed), nil
    35  	}
    36  	// parse parameters
    37  	query := request.URL.Query()
    38  	keyName := query.Get("key")
    39  	if keyName == "" {
    40  		return StringResponse(http.StatusBadRequest, "'key' query parameter is required"), nil
    41  	}
    42  	filename := query.Get("filename")
    43  	if filename == "" {
    44  		return StringResponse(http.StatusBadRequest, "'filename' query parameter is required"), nil
    45  	}
    46  	sigType := query.Get("sigtype")
    47  	keyConf := s.CheckKeyAccess(request, keyName)
    48  	if keyConf == nil {
    49  		s.Logr(request, "access denied to key %s\n", keyName)
    50  		return AccessDeniedResponse, nil
    51  	}
    52  	mod := signers.ByName(sigType)
    53  	if mod == nil {
    54  		s.Logr(request, "error: unknown sigtype: sigtype=%s key=%s", sigType, keyName)
    55  		return StringResponse(http.StatusBadRequest, "unknown sigtype"), nil
    56  	}
    57  	hash := defaultHash
    58  	if digest := request.URL.Query().Get("digest"); digest != "" {
    59  		hash = x509tools.HashByName(digest)
    60  		if hash == 0 {
    61  			s.Logr(request, "error: unknown digest %s", digest)
    62  			return StringResponse(http.StatusBadRequest, "unknown digest"), nil
    63  		}
    64  	}
    65  	flags, err := mod.FlagsFromQuery(query)
    66  	if err != nil {
    67  		s.Logr(request, "error: parsing arguments: %s", err)
    68  		return StringResponse(http.StatusBadRequest, "invalid parameters"), nil
    69  	}
    70  	// get key from token and initialize signer context
    71  	tok := s.tokens[keyConf.Token]
    72  	if tok == nil {
    73  		return nil, fmt.Errorf("missing token \"%s\" for key \"%s\"", keyConf.Token, keyName)
    74  	}
    75  	cert, opts, err := signinit.Init(request.Context(), mod, tok, keyName, hash, flags)
    76  	if err != nil {
    77  		return nil, err
    78  	}
    79  	opts.Audit.Attributes["client.ip"] = GetClientIP(request)
    80  	opts.Audit.Attributes["client.name"] = GetClientName(request)
    81  	opts.Audit.Attributes["client.dn"] = GetClientDN(request)
    82  	opts.Audit.Attributes["client.filename"] = filename
    83  	// sign the request stream and output a binpatch or signature blob
    84  	counter := readercounter.New(request.Body)
    85  	blob, err := mod.Sign(counter, cert, *opts)
    86  	if err != nil {
    87  		return nil, err
    88  	}
    89  	opts.Audit.Attributes["perf.size.in"] = counter.N
    90  	opts.Audit.Attributes["perf.size.patch"] = len(blob)
    91  	var extra string
    92  	if mod.FormatLog != nil {
    93  		extra = mod.FormatLog(opts.Audit)
    94  	}
    95  	if extra != "" {
    96  		extra = " " + extra
    97  	}
    98  	if err := signinit.PublishAudit(opts.Audit); err != nil {
    99  		return nil, err
   100  	}
   101  	s.Logr(request, "Signed package: filename=%s key=%s%s", filename, keyConf.Name(), extra)
   102  	return BytesResponse(blob, opts.Audit.GetMimeType()), nil
   103  }
   104
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