Crash when trying to return wrapped token with userpass auth CLI

[lauradiane]

When I try to return a wrapped token from the userpass auth login using the typical -wrap-ttl parameter, it causes a SIGSEGV.

Example:

$ vault auth -wrap-ttl=1m -method=userpass username=luva

// OR:

$ vault auth -method=userpass -wrap-ttl=1m username=luva
Password (will be hidden):

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x1935d99]

goroutine 1 [running]:
github.com/hashicorp/vault/builtin/credential/userpass.(*CLIHandler).Auth(0xc420209530, 0xc4206c5d40, 0xc420203170, 0x0, 0x0, 0x0, 0x0)
/gopath/src/github.com/hashicorp/vault/builtin/credential/userpass/cli.go:64 +0x329
github.com/hashicorp/vault/command.(*AuthCommand).Run(0xc42006f040, 0xc42000e1b0, 0x1, 0x1, 0xc420208f20)
/gopath/src/github.com/hashicorp/vault/command/auth.go:169 +0xe76
github.com/hashicorp/vault/vendor/github.com/mitchellh/cli.(*CLI).Run(0xc4200898c0, 0xc4200898c0, 0x27, 0x297c698)
/gopath/src/github.com/hashicorp/vault/vendor/github.com/mitchellh/cli/cli.go:235 +0x2d1
github.com/hashicorp/vault/cli.RunCustom(0xc42000e1a0, 0x4, 0x4, 0xc420150510, 0x0)
/gopath/src/github.com/hashicorp/vault/cli/main.go:44 +0x4ea
github.com/hashicorp/vault/cli.Run(0xc42000e1a0, 0x4, 0x4, 0xc420000340)
/gopath/src/github.com/hashicorp/vault/cli/main.go:11 +0x56
main.main()
/gopath/src/github.com/hashicorp/vault/main.go:10 +0x64

Environment:

• Vault Version: 0.8.1 and 0.8.1+ent

Expected Behavior:
Should return a wrapped token

Workaround:
Able to workaround this with vault write command for now. This successfully returns a wrapped token:

$ vault write -wrap-ttl=1m auth/userpass/login/luva password=foo