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sftpfs: map path resolution error to permission denied

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we do the same for os fs so that the problematic directory is excluded
from the webdav listing instead of failing the whole directory listing
This commit is contained in:
Nicola Murino 2021-10-16 10:32:18 +02:00
parent a80ac80fcd
commit 4a6a4ce28d
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GPG key ID: 2F1FB59433D5A8CB
5 changed files with 20 additions and 16 deletions
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4
docs/webdav.md
View file

@ -25,8 +25,8 @@ Know issues:
- removing a directory tree on Cloud Storage backends could generate a `not found` error when removing the last (virtual) directory. This happens if the client cycles the directories tree itself and removes files and directories one by one instead of issuing a single remove command
- the used [WebDAV library](https://pkg.go.dev/golang.org/x/net/webdav?tab=doc) asks to open a file to execute a `stat` and sometimes reads some bytes to find the content type. Stat calls are executed before and after a download too, so to be able to properly list a directory you need to grant both `list` and `download` permissions and to be able to upload files you need to gran both `list` and `upload` permissions
- the used `WebDAV library` not always returns a proper error code/message, most of the times it simply returns `Method not Allowed`. I'll try to improve the library error codes in the future
- if a file or a directory cannot be accessed, for example due to OS permissions issues or because a mapped path for a virtual folder is a missing, it will be omitted from the directory listing. This behavior is different from SFTP/FTP where you will be able to see the problematic file/directory in the directory listing, you will only get an error if you try to access it.
- the used [WebDAV library](https://pkg.go.dev/golang.org/x/net/webdav?tab=doc) not always returns a proper error code/message, most of the times it simply returns `Method not Allowed`. I'll try to improve the library error codes in the future
- if a file or a directory cannot be accessed, for example due to OS permissions issues or because a mapped path for a virtual folder is a missing, it will be omitted from the directory listing. If there is a different error then the whole directory listing will fail. This behavior is different from SFTP/FTP where you will be able to see the problematic file/directory in the directory listing, you will only get an error if you try to access it.
We plan to add [Dead Properties](https://tools.ietf.org/html/rfc4918#section-3) support in future releases. We need a design decision here, probably the best solution is to store dead properties inside the data provider but this could increase a lot its size. Alternately we could store them on disk for local filesystem and add as metadata for Cloud Storage, this means that we need to do a separate `HEAD` request to retrieve dead properties for an S3 file. For big folders will do a lot of requests to the Cloud Provider, I don't like this solution. Another option is to expose a hook and allow you to implement `dead properties` outside SFTPGo.

8
go.mod
View file

@ -3,11 +3,11 @@ module github.com/drakkan/sftpgo/v2
go 1.17
require (
cloud.google.com/go/storage v1.18.0
cloud.google.com/go/storage v1.18.1
github.com/Azure/azure-storage-blob-go v0.14.0
github.com/GehirnInc/crypt v0.0.0-20200316065508-bb7000b8a962
github.com/alexedwards/argon2id v0.0.0-20210511081203-7d35d68092b8
github.com/aws/aws-sdk-go v1.41.1
github.com/aws/aws-sdk-go v1.41.4
github.com/cockroachdb/cockroach-go/v2 v2.2.1
github.com/eikenb/pipeat v0.0.0-20210603033007-44fc3ffce52b
github.com/fatih/color v1.13.0 // indirect
@ -63,7 +63,7 @@ require (
gocloud.dev v0.24.0
golang.org/x/crypto v0.0.0-20210915214749-c084706c2272
golang.org/x/net v0.0.0-20211005215030-d2e5035098b3
golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac
golang.org/x/sys v0.0.0-20211015200801-69063c4bb744
golang.org/x/time v0.0.0-20210723032227-1f47c861a9ac
google.golang.org/api v0.58.0
google.golang.org/genproto v0.0.0-20211013025323-ce878158c4d4 // indirect
@ -85,7 +85,7 @@ require (
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.0 // indirect
github.com/fsnotify/fsnotify v1.5.1 // indirect
github.com/go-ole/go-ole v1.2.5 // indirect
github.com/go-ole/go-ole v1.2.6 // indirect
github.com/goccy/go-json v0.7.9 // indirect
github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
github.com/golang/protobuf v1.5.2 // indirect

15
go.sum
View file

@ -60,8 +60,8 @@ cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohl
cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
cloud.google.com/go/storage v1.16.1/go.mod h1:LaNorbty3ehnU3rEjXSNV/NRgQA0O8Y+uh6bPe5UOk4=
cloud.google.com/go/storage v1.18.0 h1:HM5Hu/BqgmWbo7pT9KFYGUccwzA8ZWDICJww9m5t9UA=
cloud.google.com/go/storage v1.18.0/go.mod h1:h0NImijCz/2WHwLh03BvmWdrNe4I/pzUdvUHoxIUroU=
cloud.google.com/go/storage v1.18.1 h1:hfXX1gE2mvuwoS/weBfgH1Vr+efX0uLdxX2ETJ9g1JQ=
cloud.google.com/go/storage v1.18.1/go.mod h1:FPalGc7eWSCKf26f2JwjrZhVibDE6pCDP19d1Pe2lB8=
cloud.google.com/go/trace v0.1.0/go.mod h1:wxEwsoeRVPbeSkt7ZC9nWCgmoKQRAoySN7XHW2AmI7g=
contrib.go.opencensus.io/exporter/aws v0.0.0-20200617204711-c478e41e60e9/go.mod h1:uu1P0UCM/6RbsMrgPa98ll8ZcHM858i/AD06a9aLRCA=
contrib.go.opencensus.io/exporter/stackdriver v0.13.8/go.mod h1:huNtlWx75MwO7qMs0KrMxPZXzNNWebav1Sq/pm02JdQ=
@ -137,8 +137,8 @@ github.com/aws/aws-sdk-go v1.15.27/go.mod h1:mFuSZ37Z9YOHbQEwBWztmVzqXrEkub65tZo
github.com/aws/aws-sdk-go v1.37.0/go.mod h1:hcU610XS61/+aQV88ixoOzUoG7v3b31pl2zKMmprdro=
github.com/aws/aws-sdk-go v1.38.68/go.mod h1:hcU610XS61/+aQV88ixoOzUoG7v3b31pl2zKMmprdro=
github.com/aws/aws-sdk-go v1.40.34/go.mod h1:585smgzpB/KqRA+K3y/NL/oYRqQvpNJYvLm+LY1U59Q=
github.com/aws/aws-sdk-go v1.41.1 h1:TR9j7i73tzV8ELPMc0LkImSRLljRJ+gQeArKBC7IfVE=
github.com/aws/aws-sdk-go v1.41.1/go.mod h1:585smgzpB/KqRA+K3y/NL/oYRqQvpNJYvLm+LY1U59Q=
github.com/aws/aws-sdk-go v1.41.4 h1:5xRzZp8LfBFfowMPxmoNsxLBZOY/NTH4EeI7q2F5eWE=
github.com/aws/aws-sdk-go v1.41.4/go.mod h1:585smgzpB/KqRA+K3y/NL/oYRqQvpNJYvLm+LY1U59Q=
github.com/aws/aws-sdk-go-v2 v1.7.0/go.mod h1:tb9wi5s61kTDA5qCkcDbt3KRVV74GGslQkl/DRdX/P4=
github.com/aws/aws-sdk-go-v2 v1.9.0/go.mod h1:cK/D0BBs0b/oWPIcX/Z/obahJK1TT7IPVjy53i/mX/4=
github.com/aws/aws-sdk-go-v2/config v1.7.0/go.mod h1:w9+nMZ7soXCe5nT46Ri354SNhXDQ6v+V5wqDjnZE+GY=
@ -272,8 +272,9 @@ github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9
github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
github.com/go-logfmt/logfmt v0.5.0 h1:TrB8swr/68K7m9CcGut2g3UOihhbcbiMAYiuTXdEih4=
github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A=
github.com/go-ole/go-ole v1.2.5 h1:t4MGB5xEDZvXI+0rMjjsfBsD7yAgp/s9ZDkL1JndXwY=
github.com/go-ole/go-ole v1.2.5/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
github.com/go-ole/go-ole v1.2.6 h1:/Fpf6oFPoeFik9ty7siob0G6Ke8QvQEuVcuChpwXzpY=
github.com/go-ole/go-ole v1.2.6/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
github.com/go-playground/assert/v2 v2.0.1/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
github.com/go-playground/locales v0.12.1/go.mod h1:IUMDtCfWo/w/mtMfIE/IG2K+Ey3ygWanZIBtBW0W2TM=
github.com/go-playground/locales v0.13.0/go.mod h1:taPMhCMXrRLJO55olJkUXHZBHCxTMfnGwq/HNwmWNS8=
@ -963,8 +964,8 @@ golang.org/x/sys v0.0.0-20210831042530-f4d43177bf5e/go.mod h1:oPkhp1MJrh7nUepCBc
golang.org/x/sys v0.0.0-20210908233432-aa78b53d3365/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20210917161153-d61c044b1678/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac h1:oN6lz7iLW/YC7un8pq+9bOLyXrprv2+DKfkJY+2LJJw=
golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20211015200801-69063c4bb744 h1:KzbpndAYEM+4oHRp9JmB2ewj0NHHxO3Z0g7Gus2O1kk=
golang.org/x/sys v0.0.0-20211015200801-69063c4bb744/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 h1:v+OssWQX+hTHEmOBgwxdZxK4zHq3yOs8F9J7mk0PY8E=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

2
pkgs/build.sh
View file

@ -1,6 +1,6 @@
#!/bin/bash
NFPM_VERSION=2.7.0
NFPM_VERSION=2.7.1
NFPM_ARCH=${NFPM_ARCH:-amd64}
if [ -z ${SFTPGO_VERSION} ]
then

7
vfs/sftpfs.go
View file

@ -427,6 +427,9 @@ func (*SFTPFs) IsNotExist(err error) bool {
// IsPermission returns a boolean indicating whether the error is known to
// report that permission is denied.
func (*SFTPFs) IsPermission(err error) bool {
if _, ok := err.(*pathResolutionError); ok {
return true
}
return os.IsPermission(err)
}
@ -584,11 +587,11 @@ func (fs *SFTPFs) isSubDir(name string) error {
}
if len(name) < len(fs.config.Prefix) {
err := fmt.Errorf("path %#v is not inside: %#v", name, fs.config.Prefix)
return err
return &pathResolutionError{err: err.Error()}
}
if !strings.HasPrefix(name, fs.config.Prefix+"/") {
err := fmt.Errorf("path %#v is not inside: %#v", name, fs.config.Prefix)
return err
return &pathResolutionError{err: err.Error()}
}
return nil
}