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Automated cherry pick of #65751: fix smb mount security issue #65806

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merged 1 commit into from
Jul 6, 2018
Merged

Automated cherry pick of #65751: fix smb mount security issue #65806

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18 changes: 12 additions & 6 deletions pkg/util/mount/mount_windows.go
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Original file line number Diff line number Diff line change
Expand Up @@ -81,14 +81,20 @@ func (mounter *Mounter) Mount(source string, target string, fstype string, optio
return fmt.Errorf("azureMount: only cifs mount is supported now, fstype: %q, mounting source (%q), target (%q), with options (%q)", fstype, source, target, options)
}

cmdLine := fmt.Sprintf(`$User = "%s";$PWord = ConvertTo-SecureString -String "%s" -AsPlainText -Force;`+
`$Credential = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $User, $PWord`,
options[0], options[1])

bindSource = source
cmdLine += fmt.Sprintf(";New-SmbGlobalMapping -RemotePath %s -Credential $Credential", source)

if output, err := exec.Command("powershell", "/c", cmdLine).CombinedOutput(); err != nil {
// use PowerShell Environment Variables to store user input string to prevent command line injection
// https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_environment_variables?view=powershell-5.1
cmdLine := fmt.Sprintf(`$PWord = ConvertTo-SecureString -String $Env:smbpassword -AsPlainText -Force` +
`;$Credential = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $Env:smbuser, $PWord` +
`;New-SmbGlobalMapping -RemotePath $Env:smbremotepath -Credential $Credential`)

cmd := exec.Command("powershell", "/c", cmdLine)
cmd.Env = append(os.Environ(),
fmt.Sprintf("smbuser=%s", options[0]),
fmt.Sprintf("smbpassword=%s", options[1]),
fmt.Sprintf("smbremotepath=%s", source))
if output, err := cmd.CombinedOutput(); err != nil {
return fmt.Errorf("azureMount: SmbGlobalMapping failed: %v, only SMB mount is supported now, output: %q", err, string(output))
}
}
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