diff options
Diffstat (limited to 'go/src')
| m--------- | go/src/git.lukeshu.com/go/libgnulinux | 0 | ||||
| m--------- | go/src/git.lukeshu.com/go/libnslcd | 0 | ||||
| m--------- | go/src/git.lukeshu.com/go/libsystemd | 0 | ||||
| m--------- | go/src/golang.org/x/sys | 0 | ||||
| m--------- | go/src/gopkg.in/yaml.v2 | 0 | ||||
| -rw-r--r-- | go/src/nshd/.gitignore | 1 | ||||
| -rw-r--r-- | go/src/nshd/main.go.in | 33 | ||||
| -rw-r--r-- | go/src/nshd/nshd_files/.gitignore | 2 | ||||
| -rw-r--r-- | go/src/nshd/nshd_files/passwords.go.in | 97 | ||||
| -rw-r--r-- | go/src/nshd/nshd_files/users.go.in | 143 | ||||
| -rw-r--r-- | go/src/nshd/nslcd_backend/db_config.go | 39 | ||||
| -rw-r--r-- | go/src/nshd/nslcd_backend/db_group.go | 141 | ||||
| -rw-r--r-- | go/src/nshd/nslcd_backend/db_pam.go | 204 | ||||
| -rw-r--r-- | go/src/nshd/nslcd_backend/db_passwd.go | 88 | ||||
| -rw-r--r-- | go/src/nshd/nslcd_backend/db_shadow.go | 77 | ||||
| -rw-r--r-- | go/src/nshd/nslcd_backend/hackers.go | 124 | ||||
| -rw-r--r-- | go/src/nshd/nslcd_backend/util.go | 58 | ||||
| -rw-r--r-- | go/src/nshd/util/util.go | 47 |
18 files changed, 1054 insertions, 0 deletions
diff --git a/go/src/git.lukeshu.com/go/libgnulinux b/go/src/git.lukeshu.com/go/libgnulinux new file mode 160000 +Subproject b2bae3c73817740b48a4698c6aa863d70234a64 diff --git a/go/src/git.lukeshu.com/go/libnslcd b/go/src/git.lukeshu.com/go/libnslcd new file mode 160000 +Subproject 939ef442f33dadf17f60ebf9f0c1fbaaa27f0c6 diff --git a/go/src/git.lukeshu.com/go/libsystemd b/go/src/git.lukeshu.com/go/libsystemd new file mode 160000 +Subproject 1ac9db65fda0693d13336e6471a858914348f2f diff --git a/go/src/golang.org/x/sys b/go/src/golang.org/x/sys new file mode 160000 +Subproject d75a52659825e75fff6158388dddc6a5b04f9ba diff --git a/go/src/gopkg.in/yaml.v2 b/go/src/gopkg.in/yaml.v2 new file mode 160000 +Subproject f7716cbe52baa25d2e9b0d0da546fcf909fc16b diff --git a/go/src/nshd/.gitignore b/go/src/nshd/.gitignore new file mode 100644 index 0000000..00870e2 --- /dev/null +++ b/go/src/nshd/.gitignore @@ -0,0 +1 @@ +/main.go diff --git a/go/src/nshd/main.go.in b/go/src/nshd/main.go.in new file mode 100644 index 0000000..5564128 --- /dev/null +++ b/go/src/nshd/main.go.in @@ -0,0 +1,33 @@ +// 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/>. + +// Command nshd is an implementation of nslcd that talks to +// hackers.git instead of LDAP. +package main + +import ( + "os" + "nshd/nslcd_backend" + + "git.lukeshu.com/go/libnslcd/nslcd_systemd" +) + +func main() { + backend := &nslcd_backend.Hackers{ + CfgFilename: "@conf_file@", + } + os.Exit(int(nslcd_systemd.Main(backend))) +} diff --git a/go/src/nshd/nshd_files/.gitignore b/go/src/nshd/nshd_files/.gitignore new file mode 100644 index 0000000..3be3f08 --- /dev/null +++ b/go/src/nshd/nshd_files/.gitignore @@ -0,0 +1,2 @@ +/users.go +/passwords.go diff --git a/go/src/nshd/nshd_files/passwords.go.in b/go/src/nshd/nshd_files/passwords.go.in new file mode 100644 index 0000000..679f7c0 --- /dev/null +++ b/go/src/nshd/nshd_files/passwords.go.in @@ -0,0 +1,97 @@ +// 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" + "io/ioutil" + "os" + "sort" + "strings" + + "git.lukeshu.com/go/libgnulinux/crypt" + "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 */ + +const shadow_file = "@shadow_file@" + +func LoadAllPasswords() (map[string]string, error) { + file, err := os.Open(shadow_file) + if err != nil { + return nil, err + } + contents, err := ioutil.ReadAll(file) + if err != nil { + return nil, err + } + lines := strings.Split(string(contents), "\n") + passwords := make(map[string]string, len(lines)) + for i, line := range lines { + if line == "" { + continue + } + cols := strings.SplitN(line, ":", 2) + if len(cols) != 2 { + sd_daemon.Log.Err(fmt.Sprintf("hackers.git %s:%d: malformed line", shadow_file, i+1)) + continue + } + username := cols[0] + hash := cols[1] + if hash != "!" && !crypt.SaltOk(hash) { + hash = "!" + sd_daemon.Log.Err(fmt.Sprintf("%s:%d: malformed hash for user: %s", shadow_file, i+1, username)) + } + passwords[username] = hash + } + return passwords, nil +} + +func SaveAllPasswords(passwords map[string]string) error { + usernames := make([]string, len(passwords)) + i := 0 + for username, _ := range passwords { + usernames[i] = username + i++ + } + sort.Strings(usernames) + + file, err := os.OpenFile(shadow_file+"-", os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600) + if err != nil { + return err + } + + for _, username := range usernames { + fmt.Fprintf(file, "%s:%s\n", username, passwords[username]) + } + err = file.Sync() + if err != nil { + return err + } + err = file.Close() + if err != nil { + return err + } + + return os.Rename(shadow_file+"-", shadow_file) +} diff --git a/go/src/nshd/nshd_files/users.go.in b/go/src/nshd/nshd_files/users.go.in new file mode 100644 index 0000000..51703fd --- /dev/null +++ b/go/src/nshd/nshd_files/users.go.in @@ -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 +} diff --git a/go/src/nshd/nslcd_backend/db_config.go b/go/src/nshd/nslcd_backend/db_config.go new file mode 100644 index 0000000..d00bf02 --- /dev/null +++ b/go/src/nshd/nslcd_backend/db_config.go @@ -0,0 +1,39 @@ +// 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 nslcd_backend + +import ( + p "git.lukeshu.com/go/libnslcd/nslcd_proto" + s "golang.org/x/sys/unix" +) + +func (o *Hackers) Config_Get(cred s.Ucred, req p.Request_Config_Get) <-chan p.Config { + o.lock.RLock() + ret := make(chan p.Config) + go func() { + defer o.lock.RUnlock() + defer close(ret) + + switch req.Key { + case p.NSLCD_CONFIG_PAM_PASSWORD_PROHIBIT_MESSAGE: + if o.cfg.Pam_password_prohibit_message != "" { + ret <- p.Config{Value: o.cfg.Pam_password_prohibit_message} + } + } + }() + return ret +} diff --git a/go/src/nshd/nslcd_backend/db_group.go b/go/src/nshd/nslcd_backend/db_group.go new file mode 100644 index 0000000..04c7e3b --- /dev/null +++ b/go/src/nshd/nslcd_backend/db_group.go @@ -0,0 +1,141 @@ +// 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 nslcd_backend + +import ( + "nshd/util" + + p "git.lukeshu.com/go/libnslcd/nslcd_proto" + s "golang.org/x/sys/unix" +) + +func (o *Hackers) groupByName(name string, users bool) p.Group { + members_set, found := o.groups[name] + if !found { + return p.Group{ID: -1} + } + gid := name2gid(name) + if gid < 0 { + return p.Group{ID: -1} + } + var members_list []string + if users { + members_list = util.Set2list(members_set) + } else { + members_list = make([]string, 0) + } + return p.Group{ + Name: name, + PwHash: "x", + ID: gid, + Members: members_list, + } +} + +func (o *Hackers) groupByGid(gid int32, users bool) p.Group { + name, found := gid2name(gid) + if !found { + return p.Group{ID: -1} + } + members_set, found := o.groups[name] + if !found { + return p.Group{ID: -1} + } + var members_list []string + if users { + members_list = util.Set2list(members_set) + } else { + members_list = make([]string, 0) + } + return p.Group{ + Name: name, + PwHash: "x", + ID: gid, + Members: members_list, + } +} + +func (o *Hackers) Group_ByName(cred s.Ucred, req p.Request_Group_ByName) <-chan p.Group { + o.lock.RLock() + ret := make(chan p.Group) + go func() { + defer o.lock.RUnlock() + defer close(ret) + + group := o.groupByName(req.Name, true) + if group.ID < 0 { + return + } + ret <- group + }() + return ret +} + +func (o *Hackers) Group_ByGid(cred s.Ucred, req p.Request_Group_ByGid) <-chan p.Group { + o.lock.RLock() + ret := make(chan p.Group) + go func() { + defer o.lock.RUnlock() + defer close(ret) + + group := o.groupByGid(req.Gid, true) + if group.ID < 0 { + return + } + ret <- group + }() + return ret +} + +// note that the BYMEMBER call returns an empty members list +func (o *Hackers) Group_ByMember(cred s.Ucred, req p.Request_Group_ByMember) <-chan p.Group { + o.lock.RLock() + ret := make(chan p.Group) + go func() { + defer o.lock.RUnlock() + defer close(ret) + + uid := o.name2uid(req.Member) + if uid < 0 { + return + } + for _, name := range o.users[uid].Groups { + group := o.groupByName(name, false) + if group.ID >= 0 { + ret <- group + } + } + }() + return ret +} + +func (o *Hackers) Group_All(cred s.Ucred, req p.Request_Group_All) <-chan p.Group { + o.lock.RLock() + ret := make(chan p.Group) + go func() { + defer o.lock.RUnlock() + defer close(ret) + + for name, _ := range o.groups { + group := o.groupByName(name, true) + if group.ID >= 0 { + ret <- group + } + } + }() + return ret +} diff --git a/go/src/nshd/nslcd_backend/db_pam.go b/go/src/nshd/nslcd_backend/db_pam.go new file mode 100644 index 0000000..b704620 --- /dev/null +++ b/go/src/nshd/nslcd_backend/db_pam.go @@ -0,0 +1,204 @@ +// Copyright 2015-2016 Luke Shumaker <git.lukeshu@sbcglobal>. +// +// 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 nslcd_backend + +import ( + "fmt" + "os" + + "nshd/util" + "nshd/nshd_files" + + s "golang.org/x/sys/unix" + p "git.lukeshu.com/go/libnslcd/nslcd_proto" + + "git.lukeshu.com/go/libgnulinux/crypt" + "git.lukeshu.com/go/libsystemd/sd_daemon" +) + +func checkPassword(password string, hash string) bool { + return crypt.Crypt(password, hash) == hash +} + +func hashPassword(newPassword string, oldHash string) string { + salt := oldHash + if salt == "!" { + str, err := util.RandomString(crypt.SaltAlphabet, 8) + if err != nil { + sd_daemon.Log.Err("Could not generate a random string") + str = "" + } + salt = "$6$" + str + "$" + } + return crypt.Crypt(newPassword, salt) +} + +func dirExists(path string) bool { + stat, err := os.Stat(path) + if err != nil { + return false + } + return stat.IsDir() +} + +func (o *Hackers) PAM_Authentication(cred s.Ucred, req p.Request_PAM_Authentication) <-chan p.PAM_Authentication { + o.lock.RLock() + ret := make(chan p.PAM_Authentication) + go func() { + defer o.lock.RUnlock() + defer close(ret) + + if len(req.UserName) == 0 && len(req.Password) == 0 && cred.Uid == 0 { + ret <- p.PAM_Authentication{ + AuthenticationResult: p.NSLCD_PAM_SUCCESS, + UserName: "", + AuthorizationResult: p.NSLCD_PAM_SUCCESS, + AuthorizationError: "", + } + return + } + + uid := o.name2uid(req.UserName) + if uid < 0 { + return + } + + user := o.users[uid] + obj := p.PAM_Authentication{ + AuthenticationResult: p.NSLCD_PAM_AUTH_ERR, + UserName: "", + AuthorizationResult: p.NSLCD_PAM_AUTH_ERR, + AuthorizationError: "", + } + if checkPassword(req.Password, user.Passwd.PwHash) { + obj.AuthenticationResult = p.NSLCD_PAM_SUCCESS + obj.AuthorizationResult = obj.AuthenticationResult + obj.UserName = user.Passwd.Name + } + ret <- obj + }() + return ret +} + +func (o *Hackers) PAM_Authorization(cred s.Ucred, req p.Request_PAM_Authorization) <-chan p.PAM_Authorization { + o.lock.RLock() + ret := make(chan p.PAM_Authorization) + go func() { + defer o.lock.RUnlock() + defer close(ret) + + uid := o.name2uid(req.UserName) + if uid < 0 { + return + } + ret <- p.PAM_Authorization{ + Result: p.NSLCD_PAM_SUCCESS, + Error: "", + } + }() + return ret +} + +const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" + +func (o *Hackers) PAM_SessionOpen(cred s.Ucred, req p.Request_PAM_SessionOpen) <-chan p.PAM_SessionOpen { + ret := make(chan p.PAM_SessionOpen) + go func() { + defer close(ret) + + sessionid, err := util.RandomString(alphabet, 24) + if err != nil { + return + } + ret <- p.PAM_SessionOpen{SessionID: sessionid} + }() + return ret +} + +func (o *Hackers) PAM_SessionClose(cred s.Ucred, req p.Request_PAM_SessionClose) <-chan p.PAM_SessionClose { + ret := make(chan p.PAM_SessionClose) + go close(ret) + return ret +} + +func (o *Hackers) PAM_PwMod(cred s.Ucred, req p.Request_PAM_PwMod) <-chan p.PAM_PwMod { + ret := make(chan p.PAM_PwMod) + o.lock.Lock() + go func() { + defer close(ret) + defer o.lock.Unlock() + + uid := o.name2uid(req.UserName) + if uid < 0 { + return + } + user := o.users[uid] + + // Check the OldPassword + if req.AsRoot == 1 && cred.Uid == 0 { + goto update + } + // special hack: if the old password is not + // set, but the home directory exists, let the + // user set their password + if user.Passwd.PwHash == "!" && dirExists(user.Passwd.HomeDir) { + goto update + } + if !checkPassword(req.OldPassword, user.Passwd.PwHash) { + ret <- p.PAM_PwMod{ + Result: p.NSLCD_PAM_PERM_DENIED, + Error: fmt.Sprintf("password change failed: %s", "Old password did not match"), + } + return + } + update: + if len(req.NewPassword) == 0 { + ret <- p.PAM_PwMod{ + Result: p.NSLCD_PAM_PERM_DENIED, + Error: "password cannot be empty", + } + return + } + + // Update the PwHash in memory + user.Passwd.PwHash = hashPassword(req.NewPassword, user.Passwd.PwHash) + if len(user.Passwd.PwHash) == 0 { + sd_daemon.Log.Err("Password hashing failed") + return + } + + // Update the PwHash on disk + passwords := make(map[string]string, len(o.users)) + for _, ouser := range o.users { + passwords[ouser.Passwd.Name] = ouser.Passwd.PwHash + } + passwords[user.Passwd.Name] = user.Passwd.PwHash + err := nshd_files.SaveAllPasswords(passwords) + if err != nil { + sd_daemon.Log.Err(fmt.Sprintf("Writing passwords to disk: %v", err)) + return + } + + // Ok, we're done, commit the changes + o.users[uid] = user + ret <- p.PAM_PwMod{ + Result: p.NSLCD_PAM_SUCCESS, + Error: "", + } + }() + return ret +} diff --git a/go/src/nshd/nslcd_backend/db_passwd.go b/go/src/nshd/nslcd_backend/db_passwd.go new file mode 100644 index 0000000..ace127e --- /dev/null +++ b/go/src/nshd/nslcd_backend/db_passwd.go @@ -0,0 +1,88 @@ +// 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 nslcd_backend + +import ( + p "git.lukeshu.com/go/libnslcd/nslcd_proto" + s "golang.org/x/sys/unix" +) + +/* Note that the output 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 (i.e., in the shadow database) + other - encrypted password, in crypt(3) format + + A "!" prefix on a password hash "locks" the account; therefore a a + hash of "!" says "no login"; while a hash of "x" says "you may log + in", but fails to authorize; passing the buck to the next database. + + */ + +func (o *Hackers) Passwd_ByName(cred s.Ucred, req p.Request_Passwd_ByName) <-chan p.Passwd { + o.lock.RLock() + ret := make(chan p.Passwd) + go func() { + defer o.lock.RUnlock() + defer close(ret) + + uid := o.name2uid(req.Name) + if uid < 0 { + return + } + passwd := o.users[uid].Passwd + passwd.PwHash = "x" // only put actual hashes in the Shadow DB + ret <- passwd + }() + return ret +} + +func (o *Hackers) Passwd_ByUID(cred s.Ucred, req p.Request_Passwd_ByUID) <-chan p.Passwd { + o.lock.RLock() + ret := make(chan p.Passwd) + go func() { + defer o.lock.RUnlock() + defer close(ret) + + user, found := o.users[req.UID] + if !found { + return + } + passwd := user.Passwd + passwd.PwHash = "x" // only put actual hashes in the Shadow DB + ret <- passwd + }() + return ret +} + +func (o *Hackers) Passwd_All(cred s.Ucred, req p.Request_Passwd_All) <-chan p.Passwd { + o.lock.RLock() + ret := make(chan p.Passwd) + go func() { + defer o.lock.RUnlock() + defer close(ret) + + for _, user := range o.users { + passwd := user.Passwd + passwd.PwHash = "x" // only put actual hashes in the Shadow DB + ret <- passwd + } + }() + return ret +} diff --git a/go/src/nshd/nslcd_backend/db_shadow.go b/go/src/nshd/nslcd_backend/db_shadow.go new file mode 100644 index 0000000..ab1d68f --- /dev/null +++ b/go/src/nshd/nslcd_backend/db_shadow.go @@ -0,0 +1,77 @@ +// Copyright 2015-2016 Luke Shumaker <git.lukeshu@sbcglobal>. +// +// 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 nslcd_backend + +import ( + p "git.lukeshu.com/go/libnslcd/nslcd_proto" + s "golang.org/x/sys/unix" +) + +func (o *Hackers) Shadow_ByName(cred s.Ucred, req p.Request_Shadow_ByName) <-chan p.Shadow { + o.lock.RLock() + ret := make(chan p.Shadow) + go func() { + defer o.lock.RUnlock() + defer close(ret) + + if cred.Uid != 0 { + return + } + uid := o.name2uid(req.Name) + user := o.users[uid] + ret <- p.Shadow{ + Name: user.Passwd.Name, + PwHash: user.Passwd.PwHash, + LastChangeDate: -1, + MinDays: -1, + MaxDays: -1, + WarnDays: -1, + InactDays: -1, + ExpireDate: -1, + Flag: -1, + } + }() + return ret +} + +func (o *Hackers) Shadow_All(cred s.Ucred, req p.Request_Shadow_All) <-chan p.Shadow { + o.lock.RLock() + ret := make(chan p.Shadow) + go func() { + defer o.lock.RUnlock() + defer close(ret) + + if cred.Uid != 0 { + return + } + + for _, user := range o.users { + ret <- p.Shadow{ + Name: user.Passwd.Name, + PwHash: user.Passwd.PwHash, + LastChangeDate: -1, + MinDays: -1, + MaxDays: -1, + WarnDays: -1, + InactDays: -1, + ExpireDate: -1, + Flag: -1, + } + } + }() + return ret +} diff --git a/go/src/nshd/nslcd_backend/hackers.go b/go/src/nshd/nslcd_backend/hackers.go new file mode 100644 index 0000000..44107b2 --- /dev/null +++ b/go/src/nshd/nslcd_backend/hackers.go @@ -0,0 +1,124 @@ +// 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 nslcd_backend is an nslcd_server Backend that +// speaks to hackers.git. +package nslcd_backend + +import ( + "fmt" + "sync" + + "nshd/nshd_files" + + "git.lukeshu.com/go/libnslcd/nslcd_server" + "git.lukeshu.com/go/libnslcd/nslcd_systemd" + "git.lukeshu.com/go/libsystemd/sd_daemon" +) + +type config struct { + Pam_password_prohibit_message string +} + +type Hackers struct { + nslcd_server.NilBackend + lock sync.RWMutex + + CfgFilename string + + cfg config + users map[int32]nshd_files.User + groups map[string]map[string]bool +} + +var _ nslcd_systemd.Backend = &Hackers{} +var _ nslcd_server.Backend = &Hackers{} + +func (o *Hackers) Init() error { + sd_daemon.Log.Debug(fmt.Sprintf("hackers.git: CfgFilename = %v", o.CfgFilename)) + err := o.Reload() + if err != nil { + sd_daemon.Log.Err(fmt.Sprintf("hackers.git: Could not initialize: %v", err)) + return err + } + return nil +} + +func (o *Hackers) Close() { + sd_daemon.Log.Info("hackers.git: Closing session") + o.lock.Lock() + defer o.lock.Unlock() + + o.users = make(map[int32]nshd_files.User, 0) + o.groups = make(map[string]map[string]bool) +} + +func (o *Hackers) Reload() error { + sd_daemon.Log.Info("hackers.git: Loading session") + o.lock.Lock() + defer o.lock.Unlock() + + var err error + o.cfg, err = parse_config(o.CfgFilename) + if err != nil { + return err + } + sd_daemon.Log.Info(fmt.Sprintf("hackers.git: pam_password_prohibit_message: %#v", o.cfg.Pam_password_prohibit_message)) + + sd_daemon.Log.Debug("hackers.git: Parsing user data") + o.users, err = nshd_files.LoadAllUsers() + if err != nil { + return err + } + + passwords, err := nshd_files.LoadAllPasswords() + if err != nil { + return err + } + + o.groups = make(map[string]map[string]bool) + for uid, user := range o.users { + user.Passwd.GID = usersGid + hash, hasHash := passwords[user.Passwd.Name] + if !hasHash { + hash = "!" + } + user.Passwd.PwHash = hash + o.users[uid] = user + for _, groupname := range user.Groups { + o.add_user_to_group(user.Passwd.Name, groupname) + } + } + return nil +} + +func (o *Hackers) name2uid(name string) int32 { + for uid, data := range o.users { + if data.Passwd.Name == name { + return uid + } + } + return -1 +} + +func (o *Hackers) add_user_to_group(username string, groupname string) { + group, found := o.groups[groupname] + if !found { + group = make(map[string]bool) + o.groups[groupname] = group + } + group[username] = true +} diff --git a/go/src/nshd/nslcd_backend/util.go b/go/src/nshd/nslcd_backend/util.go new file mode 100644 index 0000000..aa29b03 --- /dev/null +++ b/go/src/nshd/nslcd_backend/util.go @@ -0,0 +1,58 @@ +// 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 nslcd_backend + +import ( + "io/ioutil" + "os" + + yaml "gopkg.in/yaml.v2" + "git.lukeshu.com/go/libgnulinux/getgr" +) + +func name2gid(name string) int32 { + gr, err := getgr.ByName(name) + if gr == nil || err != nil { + return -1 + } else { + return int32(gr.Gid) + } +} + +func gid2name(gid int32) (string, bool) { + gr, err := getgr.ByGid(gid) + if gr == nil || err != nil { + return "", false + } else { + return gr.Name, true + } +} + +var usersGid = name2gid("users") + +func parse_config(filename string) (cfg config, err error) { + file, err := os.Open(filename) + if err != nil { + return + } + contents, err := ioutil.ReadAll(file) + if err != nil { + return + } + err = yaml.Unmarshal(contents, &cfg) + return +} diff --git a/go/src/nshd/util/util.go b/go/src/nshd/util/util.go new file mode 100644 index 0000000..4d3fd57 --- /dev/null +++ b/go/src/nshd/util/util.go @@ -0,0 +1,47 @@ +// 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 util + +import ( + "crypto/rand" + "math/big" +) + +func RandomString(alphabet string, n uint) (str string, err error) { + var alphabet_len = big.NewInt(int64(len(alphabet))) + var bigint *big.Int + _str := make([]byte, n) + for i := 0; i < len(_str); i++ { + bigint, err = rand.Int(rand.Reader, alphabet_len) + if err != nil { + return + } + _str[i] = alphabet[bigint.Int64()] + } + str = string(_str[:]) + return +} + +func Set2list(set map[string]bool) []string { + list := make([]string, len(set)) + i := uint(0) + for item, _ := range set { + list[i] = item + i++ + } + return list +} |