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Fix MagicDNS base domain #174

Merged
merged 7 commits into from
Oct 18, 2021
Merged

Fix MagicDNS base domain #174

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061efa1
Do not include BaseDomain as full route in DNSConfig + code reorg
juanfont Oct 17, 2021
8094e6f
Preload the Namespace from SharedMachines
juanfont Oct 17, 2021
01f755e
Send UserProfile info for the peers' namespaces
juanfont Oct 17, 2021
687e8d1
Do not use the full application for getMapResponseDNSConfig
juanfont Oct 17, 2021
ddf042c
Merge branch 'main' into fix-magic-dns-base-domain
kradalby Oct 17, 2021
01a5fe3
Added tests, solved some bugs, and code reorg
juanfont Oct 17, 2021
37e191a
Solved merge
juanfont Oct 17, 2021
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25 changes: 10 additions & 15 deletions api.go
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -243,11 +243,7 @@ func (h *Headscale) getMapResponse(mKey wgkey.Key, req tailcfg.MapRequest, m *Ma
return nil, err
}

profile := tailcfg.UserProfile{
ID: tailcfg.UserID(m.NamespaceID),
LoginName: m.Namespace.Name,
DisplayName: m.Namespace.Name,
}
profiles := getMapResponseUserProfiles(*m, peers)

nodePeers, err := peers.toNodes(h.cfg.BaseDomain, h.cfg.DNSConfig, true)
if err != nil {
Expand All @@ -258,13 +254,13 @@ func (h *Headscale) getMapResponse(mKey wgkey.Key, req tailcfg.MapRequest, m *Ma
return nil, err
}

var dnsConfig *tailcfg.DNSConfig
if h.cfg.DNSConfig != nil && h.cfg.DNSConfig.Proxied { // if MagicDNS is enabled
// Only inject the Search Domain of the current namespace - shared nodes should use their full FQDN
dnsConfig = h.cfg.DNSConfig.Clone()
dnsConfig.Domains = append(dnsConfig.Domains, fmt.Sprintf("%s.%s", m.Namespace.Name, h.cfg.BaseDomain))
} else {
dnsConfig = h.cfg.DNSConfig
dnsConfig, err := getMapResponseDNSConfig(h.cfg.DNSConfig, h.cfg.BaseDomain, *m, peers)
if err != nil {
log.Error().
Str("func", "getMapResponse").
Err(err).
Msg("Failed generate the DNSConfig")
return nil, err
}

resp := tailcfg.MapResponse{
Expand All @@ -275,10 +271,9 @@ func (h *Headscale) getMapResponse(mKey wgkey.Key, req tailcfg.MapRequest, m *Ma
Domain: h.cfg.BaseDomain,
PacketFilter: *h.aclRules,
DERPMap: h.cfg.DerpMap,

// TODO(juanfont): We should send the profiles of all the peers (this own namespace + those from the shared peers)
UserProfiles: []tailcfg.UserProfile{profile},
UserProfiles: profiles,
}

log.Trace().
Str("func", "getMapResponse").
Str("machine", req.Hostinfo.Hostname).
Expand Down
31 changes: 25 additions & 6 deletions dns.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,9 @@ import (
"fmt"
"strings"

"github.com/fatih/set"
"inet.af/netaddr"
"tailscale.com/tailcfg"
"tailscale.com/util/dnsname"
)

Expand All @@ -29,15 +31,10 @@ import (
// From the netmask we can find out the wildcard bits (the bits that are not set in the netmask).
// This allows us to then calculate the subnets included in the subsequent class block and generate the entries.
func generateMagicDNSRootDomains(ipPrefix netaddr.IPPrefix, baseDomain string) ([]dnsname.FQDN, error) {
base, err := dnsname.ToFQDN(baseDomain)
if err != nil {
return nil, err
}

// TODO(juanfont): we are not handing out IPv6 addresses yet
// and in fact this is Tailscale.com's range (note the fd7a:115c:a1e0: range in the fc00::/7 network)
ipv6base := dnsname.FQDN("0.e.1.a.c.5.1.1.a.7.d.f.ip6.arpa.")
fqdns := []dnsname.FQDN{base, ipv6base}
fqdns := []dnsname.FQDN{ipv6base}

// Conversion to the std lib net.IPnet, a bit easier to operate
netRange := ipPrefix.IPNet()
Expand Down Expand Up @@ -71,3 +68,25 @@ func generateMagicDNSRootDomains(ipPrefix netaddr.IPPrefix, baseDomain string) (
}
return fqdns, nil
}

func getMapResponseDNSConfig(dnsConfigOrig *tailcfg.DNSConfig, baseDomain string, m Machine, peers Machines) (*tailcfg.DNSConfig, error) {
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var dnsConfig *tailcfg.DNSConfig
if dnsConfigOrig != nil && dnsConfigOrig.Proxied { // if MagicDNS is enabled
// Only inject the Search Domain of the current namespace - shared nodes should use their full FQDN
dnsConfig = dnsConfigOrig.Clone()
dnsConfig.Domains = append(dnsConfig.Domains, fmt.Sprintf("%s.%s", m.Namespace.Name, baseDomain))

namespaceSet := set.New(set.ThreadSafe)
namespaceSet.Add(m.Namespace)
for _, p := range peers {
namespaceSet.Add(p.Namespace)
}
for _, namespace := range namespaceSet.List() {
dnsRoute := fmt.Sprintf("%s.%s", namespace.(Namespace).Name, baseDomain)
dnsConfig.Routes[dnsRoute] = nil
}
} else {
dnsConfig = dnsConfigOrig
}
return dnsConfig, nil
}
245 changes: 244 additions & 1 deletion dns_test.go
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Original file line number Diff line number Diff line change
@@ -1,13 +1,17 @@
package headscale

import (
"fmt"

"gopkg.in/check.v1"
"inet.af/netaddr"
"tailscale.com/tailcfg"
"tailscale.com/types/dnstype"
)

func (s *Suite) TestMagicDNSRootDomains100(c *check.C) {
prefix := netaddr.MustParseIPPrefix("100.64.0.0/10")
domains, err := generateMagicDNSRootDomains(prefix, "headscale.net")
domains, err := generateMagicDNSRootDomains(prefix, "foobar.headscale.net")
c.Assert(err, check.IsNil)

found := false
Expand Down Expand Up @@ -61,3 +65,242 @@ func (s *Suite) TestMagicDNSRootDomains172(c *check.C) {
}
c.Assert(found, check.Equals, true)
}

func (s *Suite) TestDNSConfigMapResponseWithMagicDNS(c *check.C) {
n1, err := h.CreateNamespace("shared1")
c.Assert(err, check.IsNil)

n2, err := h.CreateNamespace("shared2")
c.Assert(err, check.IsNil)

n3, err := h.CreateNamespace("shared3")
c.Assert(err, check.IsNil)

pak1n1, err := h.CreatePreAuthKey(n1.Name, false, false, nil)
c.Assert(err, check.IsNil)

pak2n2, err := h.CreatePreAuthKey(n2.Name, false, false, nil)
c.Assert(err, check.IsNil)

pak3n3, err := h.CreatePreAuthKey(n3.Name, false, false, nil)
c.Assert(err, check.IsNil)

pak4n1, err := h.CreatePreAuthKey(n1.Name, false, false, nil)
c.Assert(err, check.IsNil)

_, err = h.GetMachine(n1.Name, "test_get_shared_nodes_1")
c.Assert(err, check.NotNil)

m1 := &Machine{
ID: 1,
MachineKey: "686824e749f3b7f2a5927ee6c1e422aee5292592d9179a271ed7b3e659b44a66",
NodeKey: "686824e749f3b7f2a5927ee6c1e422aee5292592d9179a271ed7b3e659b44a66",
DiscoKey: "686824e749f3b7f2a5927ee6c1e422aee5292592d9179a271ed7b3e659b44a66",
Name: "test_get_shared_nodes_1",
NamespaceID: n1.ID,
Namespace: *n1,
Registered: true,
RegisterMethod: "authKey",
IPAddress: "100.64.0.1",
AuthKeyID: uint(pak1n1.ID),
}
h.db.Save(m1)

_, err = h.GetMachine(n1.Name, m1.Name)
c.Assert(err, check.IsNil)

m2 := &Machine{
ID: 2,
MachineKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
NodeKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
DiscoKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
Name: "test_get_shared_nodes_2",
NamespaceID: n2.ID,
Namespace: *n2,
Registered: true,
RegisterMethod: "authKey",
IPAddress: "100.64.0.2",
AuthKeyID: uint(pak2n2.ID),
}
h.db.Save(m2)

_, err = h.GetMachine(n2.Name, m2.Name)
c.Assert(err, check.IsNil)

m3 := &Machine{
ID: 3,
MachineKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
NodeKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
DiscoKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
Name: "test_get_shared_nodes_3",
NamespaceID: n3.ID,
Namespace: *n3,
Registered: true,
RegisterMethod: "authKey",
IPAddress: "100.64.0.3",
AuthKeyID: uint(pak3n3.ID),
}
h.db.Save(m3)

_, err = h.GetMachine(n3.Name, m3.Name)
c.Assert(err, check.IsNil)

m4 := &Machine{
ID: 4,
MachineKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
NodeKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
DiscoKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
Name: "test_get_shared_nodes_4",
NamespaceID: n1.ID,
Namespace: *n1,
Registered: true,
RegisterMethod: "authKey",
IPAddress: "100.64.0.4",
AuthKeyID: uint(pak4n1.ID),
}
h.db.Save(m4)

err = h.AddSharedMachineToNamespace(m2, n1)
c.Assert(err, check.IsNil)

baseDomain := "foobar.headscale.net"
dnsConfigOrig := tailcfg.DNSConfig{
Routes: make(map[string][]dnstype.Resolver),
Domains: []string{baseDomain},
Proxied: true,
}

m1peers, err := h.getPeers(m1)
c.Assert(err, check.IsNil)

dnsConfig, err := getMapResponseDNSConfig(&dnsConfigOrig, baseDomain, *m1, m1peers)
c.Assert(err, check.IsNil)
c.Assert(dnsConfig, check.NotNil)
c.Assert(len(dnsConfig.Routes), check.Equals, 2)

routeN1 := fmt.Sprintf("%s.%s", n1.Name, baseDomain)
_, ok := dnsConfig.Routes[routeN1]
c.Assert(ok, check.Equals, true)

routeN2 := fmt.Sprintf("%s.%s", n2.Name, baseDomain)
_, ok = dnsConfig.Routes[routeN2]
c.Assert(ok, check.Equals, true)

routeN3 := fmt.Sprintf("%s.%s", n3.Name, baseDomain)
_, ok = dnsConfig.Routes[routeN3]
c.Assert(ok, check.Equals, false)
}

func (s *Suite) TestDNSConfigMapResponseWithoutMagicDNS(c *check.C) {
n1, err := h.CreateNamespace("shared1")
c.Assert(err, check.IsNil)

n2, err := h.CreateNamespace("shared2")
c.Assert(err, check.IsNil)

n3, err := h.CreateNamespace("shared3")
c.Assert(err, check.IsNil)

pak1n1, err := h.CreatePreAuthKey(n1.Name, false, false, nil)
c.Assert(err, check.IsNil)

pak2n2, err := h.CreatePreAuthKey(n2.Name, false, false, nil)
c.Assert(err, check.IsNil)

pak3n3, err := h.CreatePreAuthKey(n3.Name, false, false, nil)
c.Assert(err, check.IsNil)

pak4n1, err := h.CreatePreAuthKey(n1.Name, false, false, nil)
c.Assert(err, check.IsNil)

_, err = h.GetMachine(n1.Name, "test_get_shared_nodes_1")
c.Assert(err, check.NotNil)

m1 := &Machine{
ID: 1,
MachineKey: "686824e749f3b7f2a5927ee6c1e422aee5292592d9179a271ed7b3e659b44a66",
NodeKey: "686824e749f3b7f2a5927ee6c1e422aee5292592d9179a271ed7b3e659b44a66",
DiscoKey: "686824e749f3b7f2a5927ee6c1e422aee5292592d9179a271ed7b3e659b44a66",
Name: "test_get_shared_nodes_1",
NamespaceID: n1.ID,
Namespace: *n1,
Registered: true,
RegisterMethod: "authKey",
IPAddress: "100.64.0.1",
AuthKeyID: uint(pak1n1.ID),
}
h.db.Save(m1)

_, err = h.GetMachine(n1.Name, m1.Name)
c.Assert(err, check.IsNil)

m2 := &Machine{
ID: 2,
MachineKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
NodeKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
DiscoKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
Name: "test_get_shared_nodes_2",
NamespaceID: n2.ID,
Namespace: *n2,
Registered: true,
RegisterMethod: "authKey",
IPAddress: "100.64.0.2",
AuthKeyID: uint(pak2n2.ID),
}
h.db.Save(m2)

_, err = h.GetMachine(n2.Name, m2.Name)
c.Assert(err, check.IsNil)

m3 := &Machine{
ID: 3,
MachineKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
NodeKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
DiscoKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
Name: "test_get_shared_nodes_3",
NamespaceID: n3.ID,
Namespace: *n3,
Registered: true,
RegisterMethod: "authKey",
IPAddress: "100.64.0.3",
AuthKeyID: uint(pak3n3.ID),
}
h.db.Save(m3)

_, err = h.GetMachine(n3.Name, m3.Name)
c.Assert(err, check.IsNil)

m4 := &Machine{
ID: 4,
MachineKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
NodeKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
DiscoKey: "dec46ef9dc45c7d2f03bfcd5a640d9e24e3cc68ce3d9da223867c9bc6d5e9863",
Name: "test_get_shared_nodes_4",
NamespaceID: n1.ID,
Namespace: *n1,
Registered: true,
RegisterMethod: "authKey",
IPAddress: "100.64.0.4",
AuthKeyID: uint(pak4n1.ID),
}
h.db.Save(m4)

err = h.AddSharedMachineToNamespace(m2, n1)
c.Assert(err, check.IsNil)

baseDomain := "foobar.headscale.net"
dnsConfigOrig := tailcfg.DNSConfig{
Routes: make(map[string][]dnstype.Resolver),
Domains: []string{baseDomain},
Proxied: false,
}

m1peers, err := h.getPeers(m1)
c.Assert(err, check.IsNil)

dnsConfig, err := getMapResponseDNSConfig(&dnsConfigOrig, baseDomain, *m1, m1peers)
c.Assert(err, check.IsNil)
c.Assert(dnsConfig, check.NotNil)
c.Assert(len(dnsConfig.Routes), check.Equals, 0)
c.Assert(len(dnsConfig.Domains), check.Equals, 1)
}
4 changes: 2 additions & 2 deletions machine.go
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -86,7 +86,7 @@ func (h *Headscale) getShared(m *Machine) (Machines, error) {
Msg("Finding shared peers")

sharedMachines := []SharedMachine{}
if err := h.db.Preload("Namespace").Preload("Machine").Where("namespace_id = ?",
if err := h.db.Preload("Namespace").Preload("Machine").Preload("Machine.Namespace").Where("namespace_id = ?",
m.NamespaceID).Find(&sharedMachines).Error; err != nil {
return Machines{}, err
}
Expand All @@ -113,7 +113,7 @@ func (h *Headscale) getSharedTo(m *Machine) (Machines, error) {
Msg("Finding peers in namespaces this machine is shared with")

sharedMachines := []SharedMachine{}
if err := h.db.Preload("Namespace").Preload("Machine").Where("machine_id = ?",
if err := h.db.Preload("Namespace").Preload("Machine").Preload("Machine.Namespace").Where("machine_id = ?",
m.ID).Find(&sharedMachines).Error; err != nil {
return Machines{}, err
}
Expand Down
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