From 84dbb723d5bc4119b336ed3444a243063b1e959c Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@sbcglobal.net>
Date: Sat, 4 Feb 2017 17:56:49 -0500
Subject: nshd: Centralize all config-var substitutions into a `paths.go`.

I'm tired of accidentally editing the wrong file.
---
 go/src/nshd/nshd_files/users.go | 143 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 go/src/nshd/nshd_files/users.go

(limited to 'go/src/nshd/nshd_files/users.go')

diff --git a/go/src/nshd/nshd_files/users.go b/go/src/nshd/nshd_files/users.go
new file mode 100644
index 0000000..4fd3cd1
--- /dev/null
+++ b/go/src/nshd/nshd_files/users.go
@@ -0,0 +1,143 @@
+// Copyright 2015-2016 Luke Shumaker <lukeshu@sbcglobal.net>.
+//
+// This is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of
+// the License, or (at your option) any later version.
+//
+// This software is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public
+// License along with this manual; if not, see
+// <http://www.gnu.org/licenses/>.
+
+package nshd_files
+
+import (
+	"fmt"
+	"os/exec"
+
+	"nshd/util"
+
+	yaml "gopkg.in/yaml.v2"
+	p "git.lukeshu.com/go/libnslcd/nslcd_proto"
+	"git.lukeshu.com/go/libsystemd/sd_daemon"
+)
+
+/* Note that the password hash value should be one of:
+   <empty> - no password set, allow login without password
+   !       - used to prevent logins
+   x       - "valid" encrypted password that does not match any valid password
+             often used to indicate that the password is defined elsewhere
+   other   - encrypted password, in crypt(3) format */
+
+type User struct {
+	Passwd p.Passwd
+	Groups []string
+}
+
+func LoadAllUsers() (users map[int32]User, err error) {
+	contents, err := exec.Command(BinDir + "/meta-cat").Output()
+	if err != nil {
+		return
+	}
+
+	var _data interface{}
+	err = yaml.Unmarshal(contents, &_data)
+	if err != nil {
+		return
+	}
+
+	data, isMap := _data.(map[interface{}]interface{})
+	errs := []string{}
+	if !isMap {
+		errs = append(errs, "root node is not a map")
+	} else {
+		users = make(map[int32]User, len(data))
+		for _uid, _user := range data {
+			uid, isInt := _uid.(int)
+			if !isInt {
+				errs = append(errs, fmt.Sprintf("UID is not an int: %T ( %#v )", _uid, _uid))
+				continue
+			}
+			user, _err := parseUser(_user)
+			if _err != nil {
+				errs = append(errs, fmt.Sprintf("Could not parse data for UID %d: %v", uid, _err))
+				continue
+			}
+			user.Passwd.UID = int32(uid)
+			sd_daemon.Log.Debug(fmt.Sprintf("hackers.git:  -> User %d(%s) parsed", user.Passwd.UID, user.Passwd.Name))
+			users[user.Passwd.UID] = user
+		}
+	}
+	if len(errs) > 0 {
+		users = nil
+		err = &yaml.TypeError{Errors: errs}
+	}
+	return
+}
+
+func parseUser(_data interface{}) (ret User, err error) {
+	data, isMap := _data.(map[interface{}]interface{})
+	errs := []string{}
+	if !isMap {
+		errs = append(errs, "root node is not a map")
+	} else {
+		if iface, isSet := data["username"]; !isSet {
+			errs = append(errs, "\"username\" is not set")
+		} else if str, isTyp := iface.(string); !isTyp {
+			errs = append(errs, "\"username\" is not a string")
+		} else {
+			ret.Passwd.Name = str
+			ret.Passwd.HomeDir = "/home/" + str
+		}
+
+		if iface, isSet := data["fullname"]; !isSet {
+			errs = append(errs, "\"fullname\" is not set")
+		} else if str, isTyp := iface.(string); !isTyp {
+			errs = append(errs, "\"fullname\" is not a string")
+		} else {
+			ret.Passwd.GECOS = str
+		}
+
+		if iface, isSet := data["shell"]; !isSet {
+			errs = append(errs, "\"shell\" is not set")
+		} else if str, isTyp := iface.(string); !isTyp {
+			errs = append(errs, "\"shell\" is not a string")
+		} else {
+			ret.Passwd.Shell = str
+		}
+
+		if iface, isSet := data["groups"]; !isSet {
+			ret.Groups = make([]string, 0)
+		} else if ary, isTyp := iface.([]interface{}); !isTyp {
+			errs = append(errs, "\"groups\" is not an array")
+		} else {
+			groups := make(map[string]bool, len(ary))
+			e := false
+			for _, iface := range ary {
+				if str, isTyp := iface.(string); !isTyp {
+					errs = append(errs, "\"group\" item is not an array")
+					e = true
+					break
+				} else {
+					groups[str] = true
+				}
+			}
+			if !e {
+				ret.Groups = util.Set2list(groups)
+			}
+		}
+	}
+	if len(errs) > 0 {
+		err = &yaml.TypeError{Errors: errs}
+	}
+
+	ret.Passwd.PwHash = string("x") // look in shadow for the password hash
+	ret.Passwd.GID = -1
+
+	return
+}
-- 
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