如何在 Go 中从用户名切换用户？

发布于 2024-09-27 05:08:50 字数 1167 浏览 1 评论 0原文

我必须使用给定的用户名执行此命令；在 bash 中，

$su devrim -c "touch miki"

我猜，首先我需要从用户名中获取 uid，并在执行 ForkExec 之前使用 setuid。

你可以建议吗？我该怎么做？（ps：我没有 uid，只有用户名）

func exec(cmd *Command, async bool) os.Error {
    parts := strings.Fields(cmd.Command)
    command := parts[0]

    // cmd.Su holds the username "root" or "myUser"

    pid, err := os.ForkExec(command, parts, os.Environ(), "", []*os.File{nil, cmd.Stdout, cmd.Stderr})
    cmd.Pid = pid

    if !async {
        os.Wait(pid, 0)
    }
    return nil
}

编辑：因为 sysuser 的东西不起作用，而且我看到它只是解析 /etc/passwd 我决定自己做：

func getUid(su string) int{

    passwd,_ := os.Open("/etc/passwd", os.O_RDONLY , 0600)

    reader := bufio.NewReader(passwd)

    for {
        line,err := reader.ReadString('\n')
        if err != nil { 
            println(err.String()) 
            break
        }

        parsed := strings.Split(line,":",4)

        if parsed[0] == su {
            value,_ := strconv.Atoi(parsed[2])
            return value
        }
    }

    return -1
}

我不确定是否所有 /etc/passwd 的构成与 *nix 的相同，我们使用 debian 和 ubuntu，请小心操作。

原文

I have to execute this command with given username; in bash it'd be,

$su devrim -c "touch miki"

i guess, first i need to get the uid from the username and use setuid before doing ForkExec.

can u advice? how do i do this ? (ps: i don't have the uid, only username)

func exec(cmd *Command, async bool) os.Error {
    parts := strings.Fields(cmd.Command)
    command := parts[0]

    // cmd.Su holds the username "root" or "myUser"

    pid, err := os.ForkExec(command, parts, os.Environ(), "", []*os.File{nil, cmd.Stdout, cmd.Stderr})
    cmd.Pid = pid

    if !async {
        os.Wait(pid, 0)
    }
    return nil
}

edit: since that sysuser thing didn't work, and i saw that it's only parsing the /etc/passwd i decided to do it myself:

func getUid(su string) int{

    passwd,_ := os.Open("/etc/passwd", os.O_RDONLY , 0600)

    reader := bufio.NewReader(passwd)

    for {
        line,err := reader.ReadString('\n')
        if err != nil { 
            println(err.String()) 
            break
        }

        parsed := strings.Split(line,":",4)

        if parsed[0] == su {
            value,_ := strconv.Atoi(parsed[2])
            return value
        }
    }

    return -1
}

i'm not sure if all /etc/passwd's are formed the same accross *nix's, we use debian and ubuntu, proceed with care.

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