diff options
Diffstat (limited to 'src/nslcd')
| -rw-r--r-- | src/nslcd/proto/.gitignore | 4 | ||||
| -rw-r--r-- | src/nslcd/proto/Makefile | 56 | ||||
| -rw-r--r-- | src/nslcd/proto/doc.go | 22 | ||||
| -rw-r--r-- | src/nslcd/proto/io.go | 172 | ||||
| -rw-r--r-- | src/nslcd/proto/nslcd_h.go | 454 | ||||
| -rw-r--r-- | src/nslcd/proto/server/doc.go | 23 | ||||
| -rwxr-xr-x | src/nslcd/proto/server/func_handlerequest.go.sh | 101 | ||||
| -rwxr-xr-x | src/nslcd/proto/server/interface_backend.go.sh | 39 | ||||
| -rwxr-xr-x | src/nslcd/proto/server/type_nilbackend.go.sh | 40 | ||||
| -rw-r--r-- | src/nslcd/systemd/disable_nss_module.go | 60 | ||||
| -rw-r--r-- | src/nslcd/systemd/nslcd_systemd.go | 165 |
11 files changed, 1136 insertions, 0 deletions
diff --git a/src/nslcd/proto/.gitignore b/src/nslcd/proto/.gitignore new file mode 100644 index 0000000..b3f9749 --- /dev/null +++ b/src/nslcd/proto/.gitignore @@ -0,0 +1,4 @@ +/requests.txt +/server/func_handlerequest.go +/server/interface_backend.go +/server/type_nilbackend.go diff --git a/src/nslcd/proto/Makefile b/src/nslcd/proto/Makefile new file mode 100644 index 0000000..2335374 --- /dev/null +++ b/src/nslcd/proto/Makefile @@ -0,0 +1,56 @@ +# Copyright (C) 2015 Luke Shumaker <lukeshu@sbcglobal.net> +# +# This library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2.1 of the License, or (at your option) any later version. +# +# This library 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 +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with this library; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +# 02110-1301 USA + +d := $(patsubst %/,%,$(dir $(lastword $(MAKEFILE_LIST)))) + +generate += $d/server/interface_backend.go +generate += $d/server/func_handlerequest.go +generate += $d/server/type_nilbackend.go +secondary += $d/requests.txt + +ifeq (1,$(words $(MAKEFILE_LIST))) + +all: generate +.PHONY: all + +generate: $(generate) +.PHONY: generate + +clean: + rm -f -- $(generate) $(secondary) +.PHONY: clean + +.DELETE_ON_ERROR: +.SECONDARY: + +else + +# fix these to the current value of `d` +generate := $(generate) +secondary := $(secondary) + +endif + +$d/requests.txt: $d/nslcd_h.go $d/Makefile + < $< grep -Eo '\btype Request_([^_ ]+)(_\S+)?' | sed 's/^type Request_//' > $@ + +%.go: %.go.sh + ./$^ > $@ + +$d/server/interface_backend.go: $d/requests.txt +$d/server/func_handlerequest.go: $d/requests.txt +$d/server/type_nilbackend.go: $d/server/interface_backend.go diff --git a/src/nslcd/proto/doc.go b/src/nslcd/proto/doc.go new file mode 100644 index 0000000..70929f3 --- /dev/null +++ b/src/nslcd/proto/doc.go @@ -0,0 +1,22 @@ +// Copyright (C) 2015 Luke Shumaker <lukeshu@sbcglobal.net> +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2.1 of the License, or (at your option) any later version. +// +// This library 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 +// Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public +// License along with this library; if not, write to the Free Software +// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +// 02110-1301 USA + +// Package nslcd_proto implements the nslcd protocol of nss-pam-ldapd. +// +// The godoc documentation for this packages isn't very good; you +// should look at the source file nslcd_h.go. +package nslcd_proto diff --git a/src/nslcd/proto/io.go b/src/nslcd/proto/io.go new file mode 100644 index 0000000..3c0c5be --- /dev/null +++ b/src/nslcd/proto/io.go @@ -0,0 +1,172 @@ +// Copyright (C) 2015 Luke Shumaker <lukeshu@sbcglobal.net> +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2.1 of the License, or (at your option) any later version. +// +// This library 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 +// Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public +// License along with this library; if not, write to the Free Software +// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +// 02110-1301 USA + +package nslcd_proto + +import ( + "encoding/binary" + "fmt" + "io" + "net" + "reflect" + "syscall" +) + +type NslcdError string + +func (o NslcdError) Error() string { + return string(o) +} + +type nslcdObject interface { + nslcdWrite(fd io.Writer) +} + +type nslcdObjectPtr interface { + nslcdRead(fd io.Reader) +} + +// Write an object to a stream. In the event of an error, this +// function may panic! Handle it! +func Write(fd io.Writer, data interface{}) { + switch data := data.(type) { + // basic data types + case nslcdObject: + data.nslcdWrite(fd) + case []byte: + _, err := fd.Write(data) + if err != nil { + panic(err) + } + case int32: + err := binary.Write(fd, binary.BigEndian, data) + if err != nil { + panic(err) + } + // composite datatypes + case string: + Write(fd, int32(len(data))) + Write(fd, []byte(data)) + case []string: + Write(fd, int32(len(data))) + for _, item := range data { + Write(fd, item) + } + case net.IP: + var af int32 = -1 + switch len(data) { + case net.IPv4len: + af = syscall.AF_INET + case net.IPv6len: + af = syscall.AF_INET6 + } + var bytes []byte + if af < 0 { + bytes = make([]byte, 0) + } else { + bytes = data + } + Write(fd, af) + Write(fd, int32(len(bytes))) + Write(fd, bytes) + case []net.IP: + Write(fd, int32(len(data))) + for _, item := range data { + Write(fd, item) + } + default: + v := reflect.ValueOf(data) + switch v.Kind() { + case reflect.Struct: + for i, n := 0, v.NumField(); i < n; i++ { + Write(fd, v.Field(i).Interface()) + } + default: + panic(fmt.Sprintf("Invalid structure to write NSLCD protocol data from: %T ( %#v )", data, data)) + } + } +} + +// Read an object from a stream. In the event of an error, this +// function may panic! Handle it! +func Read(fd io.Reader, data interface{}) { + switch data := data.(type) { + // basic data types + case nslcdObjectPtr: + data.nslcdRead(fd) + case *[]byte: + _, err := fd.Read(*data) + if err != nil { + panic(err) + } + case *int32: + err := binary.Read(fd, binary.BigEndian, data) + if err != nil { + panic(err) + } + // composite datatypes + case *string: + var len int32 + Read(fd, &len) + buf := make([]byte, len) + Read(fd, &buf) + *data = string(buf) + case *[]string: + var num int32 + Read(fd, &num) + *data = make([]string, num) + for i := 0; i < int(num); i++ { + Read(fd, &((*data)[i])) + } + case *net.IP: + var af int32 + Read(fd, &af) + var _len int32 + switch af { + case syscall.AF_INET: + _len = net.IPv4len + case syscall.AF_INET6: + _len = net.IPv6len + default: + panic(NslcdError(fmt.Sprintf("incorrect address family specified: %d", af))) + } + var len int32 + Read(fd, &len) + if len != _len { + panic(NslcdError(fmt.Sprintf("address length incorrect: %d", len))) + } + buf := make([]byte, len) + Read(fd, &buf) + *data = buf + case *[]net.IP: + var num int32 + Read(fd, &num) + *data = make([]net.IP, num) + for i := 0; i < int(num); i++ { + Read(fd, &((*data)[i])) + } + default: + p := reflect.ValueOf(data) + v := reflect.Indirect(p) + if p == v || v.Kind() != reflect.Struct { + panic(fmt.Sprintf("The argument to nslcd_proto/internal.Read() must be a pointer: %T ( %#v )", data, data)) + } + for i, n := 0, v.NumField(); i < n; i++ { + Read(fd, v.Field(i).Addr().Interface()) + } + } +} diff --git a/src/nslcd/proto/nslcd_h.go b/src/nslcd/proto/nslcd_h.go new file mode 100644 index 0000000..cb210cd --- /dev/null +++ b/src/nslcd/proto/nslcd_h.go @@ -0,0 +1,454 @@ +// This file is based heavily on nslcd.h from nss-pam-ldapd +// Copyright (C) 2015 Luke Shumaker +/* + nslcd.h - file describing client/server protocol + + Copyright (C) 2006 West Consulting + Copyright (C) 2006, 2007, 2009, 2010, 2011, 2012, 2013 Arthur de Jong + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + 02110-1301 USA +*/ + +package nslcd_proto + +import ( + "fmt" + "io" + "net" +) + +/* + The protocol used between the nslcd client and server is a simple binary + protocol. It is request/response based where the client initiates a + connection, does a single request and closes the connection again. Any + mangled or not understood messages will be silently ignored by the server. + + A request looks like: + INT32 NSLCD_VERSION + INT32 NSLCD_ACTION_* + [request parameters if any] + A response looks like: + INT32 NSLCD_VERSION + INT32 NSLCD_ACTION_* (the original request type) + [result(s)] + INT32 NSLCD_RESULT_END + A single result entry looks like: + NSLCD_RESULT_BEGIN int32 + [result value(s)] + If a response would return multiple values (e.g. for NSLCD_ACTION_*_ALL + functions) each return value will be preceded by a NSLCD_RESULT_BEGIN + value. After the last returned result the server sends + NSLCD_RESULT_END. If some error occurs (e.g. LDAP server unavailable, + error in the request, etc) the server terminates the connection to signal + an error condition (breaking the protocol). + + These are the available basic data types: + INT32 - 32-bit integer value + TYPE - a typed field that is transferred using sizeof() + STRING - a string length (32bit) followed by the string value (not + null-terminted) the string itself is assumed to be UTF-8 + STRINGLIST - a 32-bit number noting the number of strings followed by + the strings one at a time + + Furthermore the ADDRESS compound data type is defined as: + INT32 type of address: e.g. AF_INET or AF_INET6 + INT32 lenght of address + RAW the address itself + With the ADDRESSLIST using the same construct as with STRINGLIST. + + The protocol uses network byte order for all types. +*/ +// These basic data types are implemented in `io.go` + +/* The current version of the protocol. This protocol should only be + updated with major backwards-incompatible changes. */ +const NSLCD_VERSION int32 = 0x00000002 + +/* Get a NSLCD configuration option. There is one request parameter: */ +type Request_Config_Get struct { + Key int32 /* NSLCD_CONFIG_* */ +} +/* the result value is: */ +type Config struct { + Value string /* interpretation depending on request */ +} +const NSLCD_ACTION_CONFIG_GET int32 = 0x00010001 + +const ( + /* return the message, if any, that is presented to the user when password + modification through PAM is prohibited */ + NSLCD_CONFIG_PAM_PASSWORD_PROHIBIT_MESSAGE int32 = 1 +) + +/* Email alias (/etc/aliases) NSS requests. The result values for a + single entry are: */ +type Alias struct { + Name string + Recipients []string +} +const NSLCD_ACTION_ALIAS_BYNAME int32 = 0x00020001; type Request_Alias_ByName struct { Name string } +const NSLCD_ACTION_ALIAS_ALL int32 = 0x00020008; type Request_Alias_All struct {} + +/* Ethernet address/name mapping NSS requests. The result values for a + single entry are: */ +type Ether struct { + Name string + Address [6]byte +} +const NSLCD_ACTION_ETHER_BYNAME int32 = 0x00030001; type Request_Ether_ByName struct { Name string } +const NSLCD_ACTION_ETHER_BYETHER int32 = 0x00030002; type Request_Ether_ByEther struct { Ether [6]byte } +const NSLCD_ACTION_ETHER_ALL int32 = 0x00030008; type Request_Ether_All struct {} + +/* Group and group membership related NSS requests. The result values + for a single entry are: */ +type Group struct { + Name string + PwHash string + ID int32 + Members []string +} +/* (note that the BYMEMER call returns an emtpy members list) */ +const NSLCD_ACTION_GROUP_BYNAME int32 = 0x00040001; type Request_Group_ByName struct { Name string } +const NSLCD_ACTION_GROUP_BYGID int32 = 0x00040002; type Request_Group_ByGid struct { Gid int32 } +const NSLCD_ACTION_GROUP_BYMEMBER int32 = 0x00040006; type Request_Group_ByMember struct { Member string } +const NSLCD_ACTION_GROUP_ALL int32 = 0x00040008; type Request_Group_All struct {} + +/* Hostname (/etc/hosts) lookup NSS requests. The result values + for an entry are: */ +type Host struct { + Name string + Aliases []string + Addresses []net.IP +} +const NSLCD_ACTION_HOST_BYNAME int32 = 0x00050001; type Request_Host_ByName struct { Name string } +const NSLCD_ACTION_HOST_BYADDR int32 = 0x00050002; type Request_Host_ByAddr struct { Addr net.IP } +const NSLCD_ACTION_HOST_ALL int32 = 0x00050008; type Request_Host_All struct {} + +/* Netgroup NSS result entries contain a number of parts. A result entry + starts with: + STRING netgroup name + followed by zero or more references to other netgroups or netgroup + triples. A reference to another netgroup looks like: + INT32 NSLCD_NETGROUP_TYPE_NETGROUP + STRING other netgroup name + A a netgroup triple looks like: + INT32 NSLCD_NETGROUP_TYPE_TRIPLE + STRING host + STRING user + STRING domain + A netgroup result entry is terminated by: + INT32 NSLCD_NETGROUP_TYPE_END + */ +type Netgroup_Netgroup struct { + Name string +} +type Netgroup_Triple struct { + Host string + User string + Domain string +} +type Netgroup_PartList []interface{} +func (data Netgroup_PartList) nslcdWrite(fd io.Writer) { + for _, part := range data { + var t int32 = -1 + switch part.(type) { + case Netgroup_Netgroup: + t = NSLCD_NETGROUP_TYPE_NETGROUP + case Netgroup_Triple: + t = NSLCD_NETGROUP_TYPE_TRIPLE + } + if t < 0 { + panic("unrecognized netgroup type") + } + Write(fd, t) + Write(fd, part) + } + Write(fd, NSLCD_NETGROUP_TYPE_END) +} +func (data *Netgroup_PartList) nslcdRead(fd io.Reader) { + *data = make([]interface{}, 0) + for { + var t int32 + var v interface{} + Read(fd, &t) + switch t { + case NSLCD_NETGROUP_TYPE_NETGROUP: + v = Netgroup_Netgroup{} + case NSLCD_NETGROUP_TYPE_TRIPLE: + v = Netgroup_Triple{} + case NSLCD_NETGROUP_TYPE_END: + return + default: + panic(NslcdError(fmt.Sprintf("unrecognized netgroup type: %#08x", t))) + } + Read(fd, &v) + *data = append(*data, v) + } +} +var _ nslcdObject = Netgroup_PartList{} +var _ nslcdObjectPtr = &Netgroup_PartList{} +type Netgroup struct { + Name string + Parts Netgroup_PartList +} +const NSLCD_ACTION_NETGROUP_BYNAME int32 = 0x00060001; type Request_Netgroup_ByName struct { Name string } +const NSLCD_ACTION_NETGROUP_ALL int32 = 0x00060008; type Request_Netgroup_All struct {} +const ( + NSLCD_NETGROUP_TYPE_NETGROUP int32 = 1 + NSLCD_NETGROUP_TYPE_TRIPLE int32 = 2 + NSLCD_NETGROUP_TYPE_END int32 = 3 +) + +/* Network name (/etc/networks) NSS requests. Result values for a single + entry are: */ +type Network struct { + Name string + Aliases []string + Addresses []net.IP +} +const NSLCD_ACTION_NETWORK_BYNAME int32 = 0x00070001; type Request_Network_ByName struct { Name string } +const NSLCD_ACTION_NETWORK_BYADDR int32 = 0x00070002; type Request_Network_ByAddr struct { Addr net.IP } +const NSLCD_ACTION_NETWORK_ALL int32 = 0x00070008; type Request_Network_All struct {} + +/* User account (/etc/passwd) NSS requests. Result values are: */ +type Passwd struct { + Name string + PwHash string + UID int32 + GID int32 + GECOS string + HomeDir string + Shell string +} +const NSLCD_ACTION_PASSWD_BYNAME int32 = 0x00080001; type Request_Passwd_ByName struct { Name string } +const NSLCD_ACTION_PASSWD_BYUID int32 = 0x00080002; type Request_Passwd_ByUID struct { UID int32 } +const NSLCD_ACTION_PASSWD_ALL int32 = 0x00080008; type Request_Passwd_All struct {} + +/* Protocol information requests. Result values are: */ +type Protocol struct { + Name string + Aliases []string + Number int32 +} +const NSLCD_ACTION_PROTOCOL_BYNAME int32 = 0x00090001; type Request_Protocol_ByName struct { Name string } +const NSLCD_ACTION_PROTOCOL_BYNUMBER int32 = 0x00090002; type Request_Protocol_ByNumber struct { Number int32 } +const NSLCD_ACTION_PROTOCOL_ALL int32 = 0x00090008; type Request_Protocol_All struct {} + +/* RPC information requests. Result values are: */ +type RPC struct { + Name string + Aliases []string + Number int32 +} +const NSLCD_ACTION_RPC_BYNAME int32 = 0x000a0001; type Request_RPC_ByName struct { Name string } +const NSLCD_ACTION_RPC_BYNUMBER int32 = 0x000a0002; type Request_RPC_ByNumber struct { Number int32 } +const NSLCD_ACTION_RPC_ALL int32 = 0x000a0008; type Request_RPC_All struct {} + +/* Service (/etc/services) information requests. The BYNAME and BYNUMBER + requests contain an extra protocol string in the request which, if not + blank, will filter the services by this protocol. Result values are: */ +type Service struct { + Name string + Aliases []string + PortNumber int32 + Protocol string +} +const NSLCD_ACTION_SERVICE_BYNAME int32 = 0x000b0001; type Request_Service_ByName struct { Name string } +const NSLCD_ACTION_SERVICE_BYNUMBER int32 = 0x000b0002; type Request_Service_ByNumber struct { Number int32 } +const NSLCD_ACTION_SERVICE_ALL int32 = 0x000b0008; type Request_Service_All struct {} + +/* Extended user account (/etc/shadow) information requests. Result + values for a single entry are: */ +type Shadow struct { + // It is my understanding that an empty value for an INT32 + // field is expressed with a negative number. -- lukeshu + Name string + PwHash string + LastChangeDate int32 + MinDays int32 + MaxDays int32 + WarnDays int32 + InactDays int32 + ExpireDate int32 + Flag int32 +} +const NSLCD_ACTION_SHADOW_BYNAME int32 = 0x000c0001; type Request_Shadow_ByName struct { Name string } +const NSLCD_ACTION_SHADOW_ALL int32 = 0x000c0008; type Request_Shadow_All struct {} + +/* PAM-related requests. The request parameters for all these requests + begin with: */ +type PAM_Base struct { + UserName string + ServiceName string + RUser string + RHost string + TTY string +} +/* If the user is not known in LDAP no result may be returned (immediately + return NSLCD_RESULT_END instead of a PAM error code). */ + +/* PAM authentication check request. The extra request values are: */ +type Request_PAM_Authentication struct { + PAM_Base + Password string +} +/* and the result value consists of: */ +type PAM_Authentication struct { + AuthenticationResult int32 + UserName string + AuthorizationResult int32 + AuthorizationError string +} +/* If the username is empty in this request an attempt is made to + authenticate as the administrator (set using rootpwmoddn). + Some authorisation checks are already done during authentication so the + response also includes authorisation information. */ +const NSLCD_ACTION_PAM_AUTHENTICATION int32 = 0x000d0001 + +/* PAM authorisation check request. The result value consists of: */ +type PAM_Authorization struct { + Result int32 + Error string +} +/* The authentication check may have already returned some authorisation + information. The authorisation error message, if supplied, will be used + by the PAM module instead of a message that is generated by the PAM + module itself. */ +const NSLCD_ACTION_PAM_AUTHORIZATION int32 = 0x000d0002; type Request_PAM_Authorization PAM_Base + +/* PAM session open request. The result value consists of: */ +type PAM_SessionOpen struct { + SessionID string +} +/* This session id may be used to close this session with. */ +const NSLCD_ACTION_PAM_SESSIONOPEN int32 = 0x000d0003; type Request_PAM_SessionOpen PAM_Base + +/* PAM session close request. This request has the following + extra request value: */ +type Request_PAM_SessionClose struct { + PAM_Base + SessionID string +} +/* and this calls only returns an empty response value. */ +type PAM_SessionClose struct {} +const NSLCD_ACTION_PAM_SESSIONCLOSE int32 = 0x000d0004 + +/* PAM password modification request. This requests has the following extra + request values: */ +type Request_PAM_PwMod struct { + PAM_Base + AsRoot int32 /* 0=oldpasswd is user passwd, 1=oldpasswd is root passwd */ + OldPassword string + NewPassword string +} +/* and returns the result values: */ +type PAM_PwMod struct { + Result int32 + Error string +} +const NSLCD_ACTION_PAM_PWMOD int32 = 0x000d0005 + +/* User information change request. This request allows one to change + their full name and other information. The request parameters for this + request are: + STRING user name + INT32 asroot: 0=passwd is user passwd, 1=passwd is root passwd + STRING password + followed by one or more of the below, terminated by NSLCD_USERMOD_END + INT32 NSLCD_USERMOD_* + STRING new value + the response consists of one or more of the entries below, terminated + by NSLCD_USERMOD_END: + INT32 NSLCD_USERMOD_* + STRING response + (if the response is blank, the change went OK, otherwise the string + contains an error message) + */ +type UserMod_Item struct { + Key int32 + Value string +} +type UserMod_ItemList []UserMod_Item +func (data UserMod_ItemList) nslcdWrite(fd io.Writer) { + for _, item := range data { + Write(fd, item) + } + Write(fd, NSLCD_USERMOD_END) +} +func (data *UserMod_ItemList) nslcdRead(fd io.Reader) { + *data = make([]UserMod_Item, 0) + for { + var t int32 + Read(fd, &t) + if t == NSLCD_USERMOD_END { + return + } + var v UserMod_Item + Read(fd, &v) + *data = append(*data, v) + } +} +var _ nslcdObject = UserMod_ItemList{} +var _ nslcdObjectPtr = &UserMod_ItemList{} +type Request_UserMod struct { + UserName string + AsRoot int32 + Password string + Items UserMod_ItemList +} +type UserMod struct { + Items []UserMod_Item +} +const NSLCD_ACTION_USERMOD int32 = 0x000e0001 + +/* These are the possible values for the NSLCD_ACTION_USERMOD operation + above. */ +const ( + NSLCD_USERMOD_END int32 = 0 /* end of change values */ + NSLCD_USERMOD_RESULT int32 = 1 /* global result value */ + NSLCD_USERMOD_FULLNAME int32 = 2 /* full name */ + NSLCD_USERMOD_ROOMNUMBER int32 = 3 /* room number */ + NSLCD_USERMOD_WORKPHONE int32 = 4 /* office phone number */ + NSLCD_USERMOD_HOMEPHONE int32 = 5 /* home phone number */ + NSLCD_USERMOD_OTHER int32 = 6 /* other info */ + NSLCD_USERMOD_HOMEDIR int32 = 7 /* home directory */ + NSLCD_USERMOD_SHELL int32 = 8 /* login shell */ +) + +/* Request result codes. */ +const ( + NSLCD_RESULT_BEGIN int32 = 1 + NSLCD_RESULT_END int32 = 2 +) + +/* Partial list of PAM result codes. */ +const ( + NSLCD_PAM_SUCCESS int32 = 0 /* everything ok */ + NSLCD_PAM_PERM_DENIED int32 = 6 /* Permission denied */ + NSLCD_PAM_AUTH_ERR int32 = 7 /* Authc failure */ + NSLCD_PAM_CRED_INSUFFICIENT int32 = 8 /* Cannot access authc data */ + NSLCD_PAM_AUTHINFO_UNAVAIL int32 = 9 /* Cannot retrieve authc info */ + NSLCD_PAM_USER_UNKNOWN int32 = 10 /* User not known */ + NSLCD_PAM_MAXTRIES int32 = 11 /* Retry limit reached */ + NSLCD_PAM_NEW_AUTHTOK_REQD int32 = 12 /* Password expired */ + NSLCD_PAM_ACCT_EXPIRED int32 = 13 /* Account expired */ + NSLCD_PAM_SESSION_ERR int32 = 14 /* Cannot make/remove session record */ + NSLCD_PAM_AUTHTOK_ERR int32 = 20 /* Authentication token manipulation error */ + NSLCD_PAM_AUTHTOK_DISABLE_AGING int32 = 23 /* Password aging disabled */ + NSLCD_PAM_IGNORE int32 = 25 /* Ignore module */ + NSLCD_PAM_ABORT int32 = 26 /* Fatal error */ + NSLCD_PAM_AUTHTOK_EXPIRED int32 = 27 /* authentication token has expired */ +) diff --git a/src/nslcd/proto/server/doc.go b/src/nslcd/proto/server/doc.go new file mode 100644 index 0000000..72ae2fe --- /dev/null +++ b/src/nslcd/proto/server/doc.go @@ -0,0 +1,23 @@ +// Copyright (C) 2015 Luke Shumaker <lukeshu@sbcglobal.net> +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2.1 of the License, or (at your option) any later version. +// +// This library 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 +// Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public +// License along with this library; if not, write to the Free Software +// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +// 02110-1301 USA + +// Package nslcd_server is a framework for implementing an nslcd +// server. +// +// You write an implementation of the Backend interface, then pass +// that to the HandleRequest function for each connection. +package nslcd_server diff --git a/src/nslcd/proto/server/func_handlerequest.go.sh b/src/nslcd/proto/server/func_handlerequest.go.sh new file mode 100755 index 0000000..3ef2758 --- /dev/null +++ b/src/nslcd/proto/server/func_handlerequest.go.sh @@ -0,0 +1,101 @@ +#!/usr/bin/env bash +# -*- Mode: Go -*- +# Copyright (C) 2015 Luke Shumaker <lukeshu@sbcglobal.net> +# +# This library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2.1 of the License, or (at your option) any later version. +# +# This library 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 +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with this library; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +# 02110-1301 USA + +requests=$1 +printf '//' +printf ' %q' "$0" "$@" +printf '\n// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT\n\n' +cat <<EOF | gofmt +package nslcd_server + +import ( + "fmt" + "io" + p "nslcd/proto" + "os" + s "syscall" +) + +// Handle a request to nslcd +func HandleRequest(backend Backend, in io.Reader, out io.Writer, cred s.Ucred) (err error) { + err = nil + defer func() { + if r := recover(); r != nil { + switch r := r.(type) { + case error: + err = r + default: + panic(r) + } + } + }() + handleRequest(backend, in, out, cred) + return +} + +func handleRequest(backend Backend, in io.Reader, out io.Writer, cred s.Ucred) { + var version int32 + p.Read(in, &version) + if version != p.NSLCD_VERSION { + panic(p.NslcdError(fmt.Sprintf("Version mismatch: server=%#08x client=%#08x", p.NSLCD_VERSION, version))) + } + var action int32 + p.Read(in, &action) + + ch := make(chan interface{}) + switch action { +$( +while read -r request; do + cat <<EOT + case p.NSLCD_ACTION_${request^^}: + var req p.Request_${request} + p.Read(in, &req) + $( + if [[ $request == PAM_Authentication ]]; then + echo '_req := req' + echo '_req.Password = "<omitted-from-log>"' + echo 'fmt.Fprintf(os.Stderr, "Request: %#v\n", _req)' + else + echo 'fmt.Fprintf(os.Stderr, "Request: %#v\n", req)' + fi + ) + _ch := backend.${request}(cred, req) + go func() { + defer close(ch) + for obj := range _ch { + ch <- obj + } + }() +EOT +done < "$requests" +) + default: + close(ch) + panic(p.NslcdError(fmt.Sprintf("Unknown request action: %#08x", action))) + } + p.Write(out, p.NSLCD_VERSION) + p.Write(out, action) + + for result := range ch { + p.Write(out, p.NSLCD_RESULT_BEGIN) + p.Write(out, result) + } + p.Write(out, p.NSLCD_RESULT_END) +} +EOF diff --git a/src/nslcd/proto/server/interface_backend.go.sh b/src/nslcd/proto/server/interface_backend.go.sh new file mode 100755 index 0000000..e6eeb66 --- /dev/null +++ b/src/nslcd/proto/server/interface_backend.go.sh @@ -0,0 +1,39 @@ +#!/usr/bin/env bash +# Copyright (C) 2015 Luke Shumaker <lukeshu@sbcglobal.net> +# +# This library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2.1 of the License, or (at your option) any later version. +# +# This library 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 +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with this library; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +# 02110-1301 USA + +requests=$1 +printf '//' +printf ' %q' "$0" "$@" +printf '\n// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT\n\n' +cat <<EOF | gofmt +package nslcd_server + +import ( + s "syscall" + p "nslcd/proto" +) + +// The Backend interface allows the backend store to be implemented +// separately from the protocol implementation. Each request type +// that the nslcd server may reply to is implemented simply as a +// method that returns a channel of the resulting values. +type Backend interface { + $(sed -rn 's/([^_]+)(.*)/\1\2(s.Ucred, p.Request_\1\2) <-chan p.\1/p' "$requests" | grep -v PAM) + $(sed -rn 's/(PAM)(.*)/\1\2(s.Ucred, p.Request_\1\2) <-chan p.\1\2/p' "$requests") +} +EOF diff --git a/src/nslcd/proto/server/type_nilbackend.go.sh b/src/nslcd/proto/server/type_nilbackend.go.sh new file mode 100755 index 0000000..17aad63 --- /dev/null +++ b/src/nslcd/proto/server/type_nilbackend.go.sh @@ -0,0 +1,40 @@ +#!/usr/bin/env bash +# Copyright (C) 2015 Luke Shumaker <lukeshu@sbcglobal.net> +# +# This library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2.1 of the License, or (at your option) any later version. +# +# This library 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 +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with this library; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +# 02110-1301 USA + +interface=$1 +printf '//' +printf ' %q' "$0" "$@" +printf '\n// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT\n\n' +cat <<EOF | gofmt +package nslcd_server + +import ( + p "nslcd/proto" + s "syscall" +) + +// NilBackend implements the Backend interface, but only returns empty +// responses. It is useful to add as an anonymous member of a backend +// implementation that does not return results for all of the +// databases. +type NilBackend struct{} + +$(< "$interface" sed -rn 's/^\t([^(]+)\(s.Ucred, ([^)]+)\) <-chan (\S+)$/func (o NilBackend) \1(s.Ucred, \2) <-chan \3 { r := make(chan \3); close(r); return r }/p') + +var _ Backend = NilBackend{} +EOF diff --git a/src/nslcd/systemd/disable_nss_module.go b/src/nslcd/systemd/disable_nss_module.go new file mode 100644 index 0000000..c19ba0c --- /dev/null +++ b/src/nslcd/systemd/disable_nss_module.go @@ -0,0 +1,60 @@ +// Copyright (C) 2015 Luke Shumaker <lukeshu@sbcglobal.net> +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2.1 of the License, or (at your option) any later version. +// +// This library 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 +// Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public +// License along with this library; if not, write to the Free Software +// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +// 02110-1301 USA + +package nslcd_systemd + +import ( + "dl" + "sd_daemon/logger" + "unsafe" +) + +//static char *strary(char **ary, unsigned int n) { return ary[n]; } +import "C" + +const ( + nss_module_soname = "libnss_ldap.so.2" + nss_module_sym_version = "_nss_ldap_version" + nss_module_sym_enablelookups = "_nss_ldap_enablelookups" +) + +func disable_nss_module() { + handle, err := dl.Open(nss_module_soname, dl.RTLD_LAZY|dl.RTLD_NODELETE) + if err == nil { + defer handle.Close() + } else { + logger.Warning("NSS module %s not loaded: %v", nss_module_soname, err) + return + } + + c_version_info, err := handle.Sym(nss_module_sym_version) + if err == nil { + g_version_info := (**C.char)(unsafe.Pointer(c_version_info)) + logger.Debug("NSS module %s version %s %s", nss_module_soname, + C.GoString(C.strary(g_version_info, 0)), + C.GoString(C.strary(g_version_info, 1))) + } else { + logger.Warning("NSS module %s version missing: %v", nss_module_soname, err) + } + c_enable_flag, err := handle.Sym(nss_module_sym_enablelookups) + if err != nil { + logger.Warning("Unable to disable NSS ldap module for nslcd process: %v", err) + return + } + g_enable_flag := (*C.int)(unsafe.Pointer(c_enable_flag)) + *g_enable_flag = 0 +} diff --git a/src/nslcd/systemd/nslcd_systemd.go b/src/nslcd/systemd/nslcd_systemd.go new file mode 100644 index 0000000..f5d4881 --- /dev/null +++ b/src/nslcd/systemd/nslcd_systemd.go @@ -0,0 +1,165 @@ +// Copyright (C) 2015 Luke Shumaker <lukeshu@sbcglobal.net> +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2.1 of the License, or (at your option) any later version. +// +// This library 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 +// Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public +// License along with this library; if not, write to the Free Software +// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +// 02110-1301 USA + +// Package nslcd_systemd does the legwork for implementing a systemd +// socket-activated nslcd server. +// +// You just need to implement the Backend interface, then pass it to +// Main, which will return the exit code for the process. Everything +// but the backend is taken care of for you! +// +// package main +// +// import "nslcd/systemd" +// +// func main() { +// backend := ... +// os.Exit(int(nslcd_systemd.Main(backend))) +// } +package nslcd_systemd + +import ( + "fmt" + "net" + "nslcd/proto/server" + "os" + "os/signal" + sd "sd_daemon" + "sd_daemon/logger" + "sd_daemon/lsb" + "sync" + "syscall" +) + +type Backend interface { + nslcd_server.Backend + Init() error + Reload() error + Close() +} + +func get_socket() (socket net.Listener, err error) { + socket = nil + err = nil + fds := sd.ListenFds(true) + if fds == nil { + err = fmt.Errorf("Failed to aquire sockets from systemd") + return + } + if len(fds) != 1 { + err = fmt.Errorf("Wrong number of sockets from systemd: expected %d but got %d", 1, len(fds)) + return + } + socket, err = net.FileListener(fds[0]) + fds[0].Close() + return +} + +func getpeercred(conn *net.UnixConn) (cred syscall.Ucred, err error) { + file, err := conn.File() + if err != nil { + return + } + defer file.Close() + _cred, err := syscall.GetsockoptUcred(int(file.Fd()), syscall.SOL_SOCKET, syscall.SO_PEERCRED) + cred = *_cred + return +} + +func handler(conn *net.UnixConn, backend nslcd_server.Backend) { + defer conn.Close() + cred, err := getpeercred(conn) + if err != nil { + logger.Debug("Connection from unknown client") + } else { + logger.Debug("Connection from pid=%v uid=%v gid=%v", + cred.Pid, cred.Uid, cred.Gid) + } + err = nslcd_server.HandleRequest(backend, conn, conn, cred) + if err != nil { + logger.Notice("Error while handling request: %v", err) + } +} + +func Main(backend Backend) uint8 { + var err error = nil + + sigs := make(chan os.Signal) + signal.Notify(sigs, syscall.SIGTERM, syscall.SIGHUP) + + disable_nss_module() + + err = backend.Init() + if err != nil { + logger.Err("Could not initialize backend: %v", err) + sd.Notify(false, "STOPPING=1") + return lsb.EXIT_FAILURE + } + defer backend.Close() + + socket, err := get_socket() + if err != nil { + logger.Err("%v", err) + sd.Notify(false, "STOPPING=1") + return lsb.EXIT_NOTRUNNING + } + defer socket.Close() + sock := make(chan *net.UnixConn) + go func() { + defer lsb.Recover() + for { + conn, err := socket.Accept() + if err != nil { + logger.Notice("%v", err) + } + if conn != nil { + sock <- conn.(*net.UnixConn) + } + } + }() + + var wg sync.WaitGroup + defer wg.Wait() + defer sd.Notify(false, "STOPPING=1") + sd.Notify(false, "READY=1") + for { + select { + case sig := <-sigs: + switch sig { + case syscall.SIGTERM: + logger.Notice("Received SIGTERM, shutting down") + return lsb.EXIT_SUCCESS + case syscall.SIGHUP: + sd.Notify(false, "RELOADING=1") + err := backend.Reload() + if err != nil { + logger.Notice("Could not reload backend: %s", err.Error()) + return lsb.EXIT_NOTRUNNING + } + sd.Notify(false, "READY=1") + } + case conn := <-sock: + wg.Add(1) + go func() { + defer lsb.Recover() + defer wg.Done() + handler(conn, backend) + }() + } + } + panic("not reached") +} |