add Kerberos auth support #702
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,5 +1,43 @@ | ||
| github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8= | ||
| github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= | ||
| github.com/golang-sql/civil v0.0.0-20190719163853-cb61b32ac6fe h1:lXe2qZdvpiX5WZkZR4hgp4KJVfY3nMkvmwbVkpv1rVY= | ||
| github.com/golang-sql/civil v0.0.0-20190719163853-cb61b32ac6fe/go.mod h1:8vg3r2VgvsThLBIFL93Qb5yWzgyZWhEmBwUJWevAkK0= | ||
| github.com/gorilla/securecookie v1.1.1 h1:miw7JPhV+b/lAHSXz4qd/nN9jRiAFV5FwjeKyCS8BvQ= | ||
| github.com/gorilla/securecookie v1.1.1/go.mod h1:ra0sb63/xPlUeL+yeDciTfxMRAA+MP+HVt/4epWDjd4= | ||
| github.com/gorilla/sessions v1.2.1 h1:DHd3rPN5lE3Ts3D8rKkQ8x/0kqfeNmBAaiSi+o7FsgI= | ||
| github.com/gorilla/sessions v1.2.1/go.mod h1:dk2InVEVJ0sfLlnXv9EAgkf6ecYs/i80K/zI+bUmuGM= | ||
| github.com/hashicorp/go-uuid v1.0.2 h1:cfejS+Tpcp13yd5nYHWDI6qVCny6wyX2Mt5SGur2IGE= | ||
| github.com/hashicorp/go-uuid v1.0.2/go.mod h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/bN7x4byOro= | ||
| github.com/jcmturner/aescts/v2 v2.0.0 h1:9YKLH6ey7H4eDBXW8khjYslgyqG2xZikXP0EQFKrle8= | ||
| github.com/jcmturner/aescts/v2 v2.0.0/go.mod h1:AiaICIRyfYg35RUkr8yESTqvSy7csK90qZ5xfvvsoNs= | ||
| github.com/jcmturner/dnsutils/v2 v2.0.0 h1:lltnkeZGL0wILNvrNiVCR6Ro5PGU/SeBvVO/8c/iPbo= | ||
| github.com/jcmturner/dnsutils/v2 v2.0.0/go.mod h1:b0TnjGOvI/n42bZa+hmXL+kFJZsFT7G4t3HTlQ184QM= | ||
| github.com/jcmturner/gofork v1.0.0 h1:J7uCkflzTEhUZ64xqKnkDxq3kzc96ajM1Gli5ktUem8= | ||
| github.com/jcmturner/gofork v1.0.0/go.mod h1:MK8+TM0La+2rjBD4jE12Kj1pCCxK7d2LK/UM3ncEo0o= | ||
| github.com/jcmturner/goidentity/v6 v6.0.1 h1:VKnZd2oEIMorCTsFBnJWbExfNN7yZr3EhJAxwOkZg6o= | ||
| github.com/jcmturner/goidentity/v6 v6.0.1/go.mod h1:X1YW3bgtvwAXju7V3LCIMpY0Gbxyjn/mY9zx4tFonSg= | ||
| github.com/jcmturner/gokrb5/v8 v8.4.2 h1:6ZIM6b/JJN0X8UM43ZOM6Z4SJzla+a/u7scXFJzodkA= | ||
| github.com/jcmturner/gokrb5/v8 v8.4.2/go.mod h1:sb+Xq/fTY5yktf/VxLsE3wlfPqQjp0aWNYyvBVK62bc= | ||
| github.com/jcmturner/rpc/v2 v2.0.3 h1:7FXXj8Ti1IaVFpSAziCZWNzbNuZmnvw/i6CqLNdWfZY= | ||
| github.com/jcmturner/rpc/v2 v2.0.3/go.mod h1:VUJYCIDm3PVOEHw8sgt091/20OJjskO/YJki3ELg/Hc= | ||
| github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= | ||
| github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= | ||
| github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= | ||
| github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4= | ||
| github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg= | ||
| github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY= | ||
| github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg= | ||
| golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= | ||
| golang.org/x/crypto v0.0.0-20201112155050-0c6587e931a9 h1:umElSU9WZirRdgu2yFHY0ayQkEnKiOC1TtM3fWXFnoU= | ||
| golang.org/x/crypto v0.0.0-20201112155050-0c6587e931a9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto= | ||
| golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= | ||
| golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa h1:F+8P+gmewFQYRk6JoLQLwjBCTu3mcIURZfNkVweuRKA= | ||
| golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= | ||
| golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= | ||
| golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= | ||
| golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= | ||
| gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM= | ||
| gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= | ||
| gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= | ||
| gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo= | ||
| gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| package mssql | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| "github.com/jcmturner/gokrb5/v8/client" | ||
| "github.com/jcmturner/gokrb5/v8/config" | ||
| "github.com/jcmturner/gokrb5/v8/credentials" | ||
| "github.com/jcmturner/gokrb5/v8/keytab" | ||
| "github.com/jcmturner/gokrb5/v8/spnego" | ||
| ) | ||
|
|
||
| type krb5Auth struct { | ||
| username string | ||
| realm string | ||
| serverSPN string | ||
| password string | ||
| port uint64 | ||
| krb5Config *config.Config | ||
| krbKeytab *keytab.Keytab | ||
| krbCache *credentials.CCache | ||
| initkrbwithkeytab bool | ||
| krb5Client *client.Client | ||
| state krb5ClientState | ||
| } | ||
|
|
||
| func getKRB5Auth(user, password, serverSPN string, krb5Conf *config.Config, keytabContent *keytab.Keytab, cacheContent *credentials.CCache, initkrbwithkeytab bool) (auth, bool) { | ||
| var port uint64 | ||
| var realm, serviceStr string | ||
| var err error | ||
|
|
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| params1 := strings.Split(serverSPN, ":") | ||
| if len(params1) != 2 { | ||
| return nil, false | ||
| } | ||
|
|
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| params2 := strings.Split(params1[1], "@") | ||
| switch len(params2) { | ||
| case 1: | ||
| port, err = strconv.ParseUint(params1[1], 10, 16) | ||
| if err != nil { | ||
| return nil, false | ||
| } | ||
| case 2: | ||
| port, err = strconv.ParseUint(params2[0], 10, 16) | ||
| if err != nil { | ||
| return nil, false | ||
| } | ||
| default: | ||
| return nil, false | ||
| } | ||
|
|
||
| params3 := strings.Split(serverSPN, "@") | ||
| switch len(params3) { | ||
| case 1: | ||
| serviceStr = params3[0] | ||
| params3 = strings.Split(params1[0], "/") | ||
| params3 = strings.Split(params3[1], ".") | ||
| realm = params3[1] + "." + params3[2] | ||
| case 2: | ||
| realm = params3[1] | ||
| serviceStr = params3[0] | ||
| default: | ||
| return nil, false | ||
| } | ||
|
|
||
| return &krb5Auth{ | ||
| username: user, | ||
| serverSPN: serviceStr, | ||
| port: port, | ||
| realm: realm, | ||
| krb5Config: krb5Conf, | ||
| krbKeytab: keytabContent, | ||
| krbCache: cacheContent, | ||
| password: password, | ||
| initkrbwithkeytab: initkrbwithkeytab, | ||
| }, true | ||
| } | ||
|
|
||
| func (auth *krb5Auth) InitialBytes() ([]byte, error) { | ||
| // Set to lookup KDCs in DNS | ||
| auth.krb5Config.LibDefaults.DNSLookupKDC = false | ||
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|
||
| var cl *client.Client | ||
| var err error | ||
| // Init keytab from conf | ||
| if auth.initkrbwithkeytab { | ||
| // Init krb5 client and login | ||
| cl = client.NewWithKeytab(auth.username, auth.realm, auth.krbKeytab, auth.krb5Config, client.DisablePAFXFAST(true)) | ||
| } else { | ||
| cl, err = client.NewFromCCache(auth.krbCache, auth.krb5Config) | ||
| if err != nil { | ||
| return []byte{}, err | ||
| } | ||
| } | ||
| auth.krb5Client = cl | ||
| auth.state = initiatorStart | ||
| tkt, sessionKey, err := cl.GetServiceTicket(auth.serverSPN) | ||
| if err != nil { | ||
| return []byte{}, err | ||
| } | ||
|
|
||
| negTok, err := spnego.NewNegTokenInitKRB5(auth.krb5Client, tkt, sessionKey) | ||
| if err != nil { | ||
| return []byte{}, err | ||
| } | ||
|
|
||
| outToken, err := negTok.Marshal() | ||
| if err != nil { | ||
| return []byte{}, err | ||
| } | ||
| auth.state = initiatorWaitForMutal | ||
| return outToken, nil | ||
| } | ||
|
|
||
| func (auth *krb5Auth) Free() { | ||
| auth.krb5Client.Destroy() | ||
| } | ||
|
|
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| func (auth *krb5Auth) NextBytes(token []byte) ([]byte, error) { | ||
| var spnegoToken spnego.SPNEGOToken | ||
| if err := spnegoToken.Unmarshal(token); err != nil { | ||
| err := fmt.Errorf("unmarshal APRep token failed: %w", err) | ||
| return []byte{}, err | ||
| } | ||
| auth.state = initiatorReady | ||
| return []byte{}, nil | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,162 @@ | ||
| package mssql | ||
|
|
||
| import ( | ||
| "reflect" | ||
| "testing" | ||
|
|
||
| "github.com/jcmturner/gokrb5/v8/client" | ||
| "github.com/jcmturner/gokrb5/v8/config" | ||
| "github.com/jcmturner/gokrb5/v8/credentials" | ||
| "github.com/jcmturner/gokrb5/v8/keytab" | ||
| ) | ||
|
|
||
| func TestGetKRB5Auth(t *testing.T) { | ||
| krbConf := &config.Config{} | ||
| krbKeytab := &keytab.Keytab{} | ||
| krbCache := &credentials.CCache{} | ||
|
|
||
| got, _ := getKRB5Auth("", "", "MSSQLSvc/mssql.domain.com:1433", krbConf, krbKeytab, krbCache, true) | ||
| keytab := &krb5Auth{username: "", | ||
| realm: "domain.com", | ||
| serverSPN: "MSSQLSvc/mssql.domain.com:1433", | ||
| password: "", | ||
| port: 1433, | ||
| krb5Config: krbConf, | ||
| krbKeytab: krbKeytab, | ||
| krbCache: krbCache, | ||
| initkrbwithkeytab: true, | ||
| state: 0} | ||
|
|
||
| res := reflect.DeepEqual(got, keytab) | ||
| if !res { | ||
| t.Errorf("Failed to get correct krb5Auth object\nExpected:%v\nRecieved:%v", keytab, got) | ||
| } | ||
|
|
||
| got, _ = getKRB5Auth("", "", "MSSQLSvc/mssql.domain.com:1433", krbConf, krbKeytab, krbCache, false) | ||
| keytab = &krb5Auth{username: "", | ||
| realm: "domain.com", | ||
| serverSPN: "MSSQLSvc/mssql.domain.com:1433", | ||
| password: "", | ||
| port: 1433, | ||
| krb5Config: krbConf, | ||
| krbKeytab: krbKeytab, | ||
| krbCache: krbCache, | ||
| initkrbwithkeytab: false, | ||
| state: 0} | ||
|
|
||
| res = reflect.DeepEqual(got, keytab) | ||
| if !res { | ||
| t.Errorf("Failed to get correct krb5Auth object\nExpected:%v\nRecieved:%v", keytab, got) | ||
| } | ||
|
|
||
| _, val := getKRB5Auth("", "", "MSSQLSvc/mssql.domain.com", krbConf, krbKeytab, krbCache, true) | ||
| if val { | ||
| t.Errorf("Failed to get correct krb5Auth object: no port defined") | ||
| } | ||
|
|
||
| got, _ = getKRB5Auth("", "", "MSSQLSvc/mssql.domain.com:1433@DOMAIN.COM", krbConf, krbKeytab, krbCache, true) | ||
| keytab = &krb5Auth{username: "", | ||
| realm: "DOMAIN.COM", | ||
| serverSPN: "MSSQLSvc/mssql.domain.com:1433", | ||
| password: "", | ||
| port: 1433, | ||
| krb5Config: krbConf, | ||
| krbKeytab: krbKeytab, | ||
| krbCache: krbCache, | ||
| initkrbwithkeytab: true, | ||
| state: 0} | ||
|
|
||
| res = reflect.DeepEqual(got, keytab) | ||
| if !res { | ||
| t.Errorf("Failed to get correct krb5Auth object\nExpected:%v\nRecieved:%v", keytab, got) | ||
| } | ||
|
|
||
| _, val = getKRB5Auth("", "", "MSSQLSvc/mssql.domain.com:1433@domain.com@test", krbConf, krbKeytab, krbCache, true) | ||
| if val { | ||
| t.Errorf("Failed to get correct krb5Auth object due to incorrect serverSPN name") | ||
| } | ||
|
|
||
| _, val = getKRB5Auth("", "", "MSSQLSvc/mssql.domain.com:port@domain.com", krbConf, krbKeytab, krbCache, true) | ||
| if val { | ||
| t.Errorf("Failed to get correct krb5Auth object due to incorrect port") | ||
| } | ||
|
|
||
| _, val = getKRB5Auth("", "", "MSSQLSvc/mssql.domain.com:port", krbConf, krbKeytab, krbCache, true) | ||
| if val { | ||
| t.Errorf("Failed to get correct krb5Auth object due to incorrect port") | ||
| } | ||
| } | ||
|
|
||
| func TestInitialBytes(t *testing.T) { | ||
| krbConf := &config.Config{} | ||
| krbKeytab := &keytab.Keytab{} | ||
| krbCache := &credentials.CCache{} | ||
| krbObj := &krb5Auth{username: "", | ||
| realm: "domain.com", | ||
| serverSPN: "MSSQLSvc/mssql.domain.com:1433", | ||
| password: "", | ||
| port: 1433, | ||
| krb5Config: krbConf, | ||
| krbKeytab: krbKeytab, | ||
| krbCache: krbCache, | ||
| initkrbwithkeytab: false, | ||
| state: 0, | ||
| } | ||
|
|
||
| _, err := krbObj.InitialBytes() | ||
| if err == nil { | ||
|
There was a problem hiding this comment. If the test is expecting a nil err please change the |
||
| t.Errorf("Failed to get Initial bytes") | ||
| } | ||
|
|
||
| krbObj.initkrbwithkeytab = true | ||
| _, err = krbObj.InitialBytes() | ||
| if err == nil { | ||
| t.Errorf("Failed to get Initial bytes") | ||
| } | ||
| } | ||
|
|
||
| func TestNextBytes(t *testing.T) { | ||
| ans := []byte{} | ||
| krbConf := &config.Config{} | ||
| krbKeytab := &keytab.Keytab{} | ||
| krbCache := &credentials.CCache{} | ||
|
|
||
| var krbObj auth = &krb5Auth{username: "", | ||
| realm: "domain.com", | ||
| serverSPN: "MSSQLSvc/mssql.domain.com:1433", | ||
| password: "", | ||
| port: 1433, | ||
| krb5Config: krbConf, | ||
| krbKeytab: krbKeytab, | ||
| krbCache: krbCache, | ||
| initkrbwithkeytab: true, | ||
| state: 0} | ||
|
|
||
| _, err := krbObj.NextBytes(ans) | ||
| if err == nil { | ||
| t.Errorf("Error getting next byte") | ||
| } | ||
| } | ||
|
|
||
| func TestFree(t *testing.T) { | ||
|
There was a problem hiding this comment. a test should have at least one assertion |
||
| krbConf := &config.Config{} | ||
| krbKeytab := &keytab.Keytab{} | ||
| krbCache := &credentials.CCache{} | ||
| kt := &keytab.Keytab{} | ||
| c := &config.Config{} | ||
| cl := client.NewWithKeytab("Administrator", "DOMAIN.COM", kt, c, client.DisablePAFXFAST(true)) | ||
|
|
||
| var krbObj auth = &krb5Auth{username: "", | ||
| realm: "domain.com", | ||
| serverSPN: "MSSQLSvc/mssql.domain.com:1433", | ||
| password: "", | ||
| port: 1433, | ||
| krb5Config: krbConf, | ||
| krbKeytab: krbKeytab, | ||
| krbCache: krbCache, | ||
| initkrbwithkeytab: true, | ||
| state: 0, | ||
| krb5Client: cl, | ||
| } | ||
| krbObj.Free() | ||
| } | ||
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I agree 1.13 is probably a reasonable minimum requirement at this point.
That said - it may be worthwhile to decouple specific auth implementations like this one from msdsn in general and instead have each auth implementation inject itself into a discovery mechanism such as with some visitor pattern on the connection properties. I'm new enough to Go not to know the best way to have such dependency injection.
With such dependency injection you could mark the kerbauth files for 1.13+ only.
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How could this PR align with #718 ?
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@shueybubbles with 718, anyone using go-mssql driver for kerberos will have to implement their own custom logic and/or maintain their own repos to handle the entire kerberos authN process.
Moreover my PR provides with flexibility to use either krb cache or keytab file which I believe is missing from 718?
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My other comment re: coupling the config to the specific krb implementation is my main concern. The other PR at least avoids such coupling. I think there should be a way for the backend of the driver to manage krb more transparently than having the client use krb-specific packages to even define the connection.