Annotation of www/anoncvs.shar, Revision 1.15
1.1 deraadt 1: # This is a shell archive. Save it in a file, remove anything before
2: # this line, and then unpack it by entering "sh file". Note, it may
3: # create directories; files and directories will be owned by you and
4: # have default permissions.
5: #
6: # This archive contains:
7: #
1.6 deraadt 8: # Makefile
1.1 deraadt 9: # README
10: # anoncvssh.c
11: #
1.6 deraadt 12: echo x - Makefile
13: sed 's/^X//' >Makefile << 'END-of-Makefile'
14: X#CVSROOT=anoncvs@anoncvs1.usa.openbsd.org:/cvs
15: XPROG= anoncvssh
16: XBINOWN= root
17: XBINMODE=4111
18: XBINDIR=/open
19: XNOMAN=
20: X
21: X.include <bsd.prog.mk>
22: X
23: END-of-Makefile
1.1 deraadt 24: echo x - README
25: sed 's/^X//' >README << 'END-of-README'
26: X
1.7 beck 27: X So, you want to run an anoncvs server.
28: X
29: X A summary of the steps you'll need to do is:
30: X
31: X1) Find enough disk space to hold the anoncvs tree, and mount it in an
1.14 millert 32: X appropriate place.
1.7 beck 33: X
34: X2) Compile and install anoncvssh, the shell used for the anoncvs user.
35: X ( If you aren't using OpenBSD you'll probably need to compile a sup
36: X client as well. The easier path is to use OpenBSD ;)
37: X
38: X3) Add the anoncvs user to the password file, with no password, and
1.14 millert 39: X anoncvssh as it's shell. Decide on a user that will run sup to maintain
40: X the archive (this is a different user, NOT the anoncvs user)
1.7 beck 41: X
1.14 millert 42: X4) Make a home directory for the anoncvs user. The anoncvs user's
43: X home directory is a chroot jail in which the anoncvssh processes
44: X run when servicing anoncvs requests. The jail must contain the
45: X cvs binary as well as whatever shared libraries and support files
46: X are needed to run them unless you compile and link everything
47: X staticly. This example shows what is needed for OpenBSD. If you
48: X use another platform you'll need to be familiar with what needs
49: X to go in a chroot jail for your platform.
1.7 beck 50: X
51: X5) Get permission to use sup to obtain the cvs tree from a server.
1.1 deraadt 52: X
1.7 beck 53: X6) Set up sup to retrieve the cvs tree from an appropriate place.
54: X (If you aren't using OpenBSD you will need to compile and install
55: X a sup client).
1.6 deraadt 56: X
1.7 beck 57: X7) Run sup to retrieve the distribution from the server
1.3 deraadt 58: X
1.7 beck 59: X8) Once you get the distribution in, set up a cron job to run sup
60: X periodically to keep your server up to date.
1.6 deraadt 61: X
1.7 beck 62: X**********************************************************************
63: XSTEP 1) find enough disk space.
1.14 millert 64: X You need roughly 1.6GB.
65: X Mount it on /open.
66: X If you are not able to mount it as /open, substitute it's location
67: X throughout the rest of this description.
1.6 deraadt 68: X
1.7 beck 69: X**********************************************************************
70: XSTEP 2) compile the anoncvssh binary
1.14 millert 71: X In the Makefile, change the variable CVSROOT
72: X Install the binary setuid-root in /open/anoncvssh.
1.1 deraadt 73: X
1.7 beck 74: X**********************************************************************
75: XSTEP 3) Create the anoncvs account. and decide who will run "sup"
1.14 millert 76: X to maintain the archive. The anoncvs account should *NOT* be the one
77: X running sup to maintain the archive.
1.1 deraadt 78: X
1.9 beck 79: Xcreate an account similar to:
80: X
1.7 beck 81: X anoncvs::32766:32766:Anonymous CVS User:/open/anoncvs:/open/anoncvssh
1.4 deraadt 82: X
1.14 millert 83: XYes, that is right. the account has no password. Be sure that the
84: Xuid and gid are unique for your system, if the ones above aren't,
85: Xpick different values.
1.9 beck 86: X
1.14 millert 87: XDecide who will run sup to maintain the archive. call that user
88: X$SUPUSER. Oh, and in case it hasn't been previously mentioned,
89: X$SUPUSER should *NOT* be the anoncvs user :)
1.7 beck 90: X
91: X**********************************************************************
1.14 millert 92: XSTEP 4) Build the anoncvs user's home directory chroot jail. This
93: X example assumes that you're using OpenBSD. If you're not you
94: X may need different files in the chroot.
1.4 deraadt 95: X
1.1 deraadt 96: Xmkdir /open/anoncvs
97: Xmkdir /open/anoncvs/cvs
1.6 deraadt 98: Xmkdir /open/anoncvs/sup
99: Xchown -R $SUPUSER /open/anoncvs/cvs /open/anoncvs/sup /open/anoncvs
1.1 deraadt 100: X
1.14 millert 101: XStart filling the account up with nice stuff. You are building a chroot
1.7 beck 102: Xjail for anoncvs in /open/anoncvs.
103: X
1.1 deraadt 104: X cd /open/anoncvs
105: X touch .hushlogin
106: X touch .profile
107: X
1.14 millert 108: XPut a message like the following in .plan:
1.6 deraadt 109: X To use anonymous CVS install the latest version of CVS on your local
110: X machine.
1.1 deraadt 111: X Then set your CVSROOT environment variable to the following value:
112: X anoncvs@anoncvs.openbsd.org:/cvs
113: X
1.14 millert 114: X chown root:wheel .hushlogin .profile .plan
1.1 deraadt 115: X
116: X mkdir bin dev tmp usr var etc
117: X cp /bin/{cat,pwd,rm,sh} bin/
118: X
1.14 millert 119: XUsing mknod, make a dev/null that has the same major/minor numbers as
1.1 deraadt 120: X your /dev/null, and make it mode 666.
121: X
1.14 millert 122: XSome shared library systems require a dev/zero created in the same way
1.1 deraadt 123: X
1.14 millert 124: XFill etc space for the account
1.1 deraadt 125: X cp /etc/{group,hosts,passwd,protocols} etc/
126: X cp /etc/{pwd.db,resolv.conf,services,ttys} etc/
127: X modify these files to suit your idea of system security
128: X
1.14 millert 129: Xanoncvssh (by setting the environment variable CVSREADONLYFS) uses
130: Xan tiny extension provided in the openbsd cvs server code which
131: Xpermits the use of read-only cvs repositories. therefore you MUST
132: Xcompile the openbsd version of cvs. luckily this is not a problem
133: Xon a non-openbsd machine since the cvs sources are imported verbatim
134: Xinto the openbsd tree. they are in gnu/usr.bin/cvs. The sources
135: Xare integrated such that Makefile.bsd-wrapper knows how to build
136: Xthe sources on an OpenBSD machine, using obj directories.
1.1 deraadt 137: X
1.14 millert 138: XCreate tmp space for the account
1.13 millert 139: X # cd var; ln -s ../tmp tmp
140: X # chmod a+rwx tmp
1.1 deraadt 141: X
1.13 millert 142: X # mkdir usr/{bin,lib}
143: X # cp /usr/bin/cvs usr/bin/
1.1 deraadt 144: X
1.14 millert 145: XIf your system has ld.so in /usr/libexec,
1.13 millert 146: X # mkdir usr/libexec
147: X # cp /usr/libexec/ld.so usr/libexec/
1.1 deraadt 148: X
1.14 millert 149: XIf using shared libraries, use ldd to find out which shared libs you need:
1.13 millert 150: X # ldd /usr/bin/cvs
151: X /usr/bin/cvs:
152: X -lz.1 => /usr/lib/libz.so.1.4 (0x40097000)
153: X -lgssapi.1 => /usr/lib/libgssapi.so.1.0 (0x400a4000)
154: X -lkrb.10 => /usr/lib/libkrb.so.10.0 (0x400ae000)
155: X -lkrb5.4 => /usr/lib/libkrb5.so.4.0 (0x400c8000)
156: X -lasn1.2 => /usr/lib/libasn1.so.2.0 (0x400ff000)
157: X -lcrypto.6 => /usr/lib/libcrypto.so.6.0 (0x4011d000)
158: X -ldes.7 => /usr/lib/libdes.so.7.0 (0x40203000)
159: X -lkafs.10 => /usr/lib/libkafs.so.10.0 (0x4020d000)
160: X -lc.28 => /usr/lib/libc.so.28.5 (0x40210000)
161: X
162: X and then copy the required libraries to usr/lib/
1.1 deraadt 163: X
1.14 millert 164: XAs a final pass, make sure that all the files you have just created are
165: Xnot world writable (except dev/null).
1.1 deraadt 166: X
1.7 beck 167: XFor :pserver: support (optional)
168: X - Create an entry in /etc/services
169: X cvspserver 2401/tcp # CVS client/server operations
170: X - Create an entry in /etc/inetd.conf
171: X cvspserver stream tcp nowait anoncvs /open/anoncvssh anoncvssh pserver
1.11 millert 172: X - Create a file /open/anoncvs/cvs/CVSROOT/passwd with the following entry
173: X anoncvs:AHDysQkJIubEc
174: X which would be a password of "anoncvs" (as per anoncvs.html)
175: X - Create a file /open/anoncvs/cvs/CVSROOT/readers with a single entry:
176: X anoncvs
177: X which tells cvs that user "anoncvs" is allowed readonly access.
178: X - Create a zero-length file /open/anoncvs/cvs/CVSROOT/writers since you don't
179: X want anyone to be able to write to the mirror.
180: X % cp /dev/null /open/anoncvs/cvs/CVSROOT/writers
1.7 beck 181: X
182: XSee the example layout below for full details.
183: X
184: X**********************************************************************
185: XSTEP 5): Get sup permission.
186: Xsend mail to sup@openbsd.org
187: X1) to have sup permissions granted on an appropriate machine for you
1.10 beck 188: X to sup from. We will need to know your host's real hostname and
189: X IP address.
1.3 deraadt 190: X2) to have an anoncvsN.COUNTRY.openbsd.org alias created
191: X3) to have your site mentioned in the http://www.openbsd.org page.
192: X
1.7 beck 193: X**********************************************************************
194: XSTEP 6): Configure sup
195: X
196: XIf you're running OpenBSD, you already have a sup client in
197: X/usr/bin/sup. If not you may need to build it. On an IRIX or other
1.14 millert 198: XSYSV machine, ensure that your kernel does not allow a user to chown
199: Xa file to another user (You may have heard of this particular brand
200: Xof evil referred to as "chown giveaway"). this will cause sup to
201: Xgive away the files to root before chmod'ing them readable.
202: Xmichaels@openbsd.org knows how to fix this.
1.7 beck 203: X
1.14 millert 204: XThe file /open/anoncvs/sup/ss contains a line that tells sup where
205: Xto get the cvs tree from. it will normally contain:
1.7 beck 206: X
1.14 millert 207: X cvs host=anoncvs.ca.openbsd.org hostbase=/usr/OpenBSD base=/open/anoncvs delete
1.7 beck 208: X
1.14 millert 209: XThe file /open/anoncvs/sup/cvs/refuse tells sup what files it should not get.
1.11 millert 210: XIt should contain the following lines:
1.7 beck 211: X
212: X cvs/CVSROOT/history
1.11 millert 213: X cvs/CVSROOT/readers
214: X cvs/CVSROOT/writers
215: X cvs/CVSROOT/passwd
1.7 beck 216: X
217: Xif you ever fetch the file cvs/CVSROOT/history, delete it. it will
218: Xcause you problems.
219: X
220: X**********************************************************************
221: XSTEP 7): Run sup to retrieve the tree for the first time
222: X
223: XLog in as or become the $SUPUSER, and run
224: X
225: Xsup -v /open/anoncvs/sup/ss > /tmp/suplog &; tail -f /tmp/suplog
226: X
227: XIf you have sup permission, and have specified the correct host and
228: Xhostbase in /open/anoncvs/sup/ss you should see a list of files start
229: Xcoming in after a short while. Don't panic if nothing happens
230: Ximmediately. Watch for errors (sup can timeout or die). If you can't
231: Xaccess files contact the sup server maintainer, If you get a timeout
232: Xor if sup dies you can restart and it should continue where it left off.
233: X
234: XIt can take a good while (and a couple of restarts) to obtain the
235: Xwhole tree for the first time.
236: X
237: X**********************************************************************
238: XSTEP 8): Set up cron to keep the tree up to date.
239: X
240: XYou run sup periodically from the cron by setting up the crontab file
241: Xof the $SUPUSER.
242: X
243: XFor example: To run every three hours 'sup -v supfile', and thrice
244: Xweekly 'sup -vo supfile' .. because sup is not reliable ..
245: X
246: X0 0,3,6,9,12,15,18,21 * * 0,2,4,5 sup -v /open/anoncvs/sup/ss > /dev/null
247: X0 0,12,15,18,21 * * 1,3,6 sup -v /open/anoncvs/sup/ss > /dev/null
248: X0 3 * * 1,3,6 sup -vo /open/anoncvs/sup/ss > /dev/null
249: X
250: Xanoncvs5.usa.openbsd.org uses this particular set of entries. A `sup
251: X-o' is done every few days because sup is not very robust.
252: X
253: X**********************************************************************
254: XEXAMPLE LAYOUT
255: X
256: XExample layout for OpenBSD. In this example "deraadt" is the $SUPUSER.
1.3 deraadt 257: X
258: X[eap open 5 ]> cd /open
259: X[eap open 6 ]> ls -alF
260: Xtotal 46
261: Xdrwxr-xr-x 7 root wheel 512 Feb 20 09:58 ./
262: Xdrwxr-xr-x 17 root wheel 512 Jun 14 14:05 ../
263: Xdrwxr-xr-x 9 root wheel 512 Jan 3 21:55 anoncvs/
264: X---s--x--x 1 root bin 16384 Nov 30 1995 anoncvssh*
265: Xlrwxr-xr-x 1 root wheel 11 Jan 3 21:52 cvs@ -> anoncvs/cvs
266: Xdrwxr-xr-x 5 root wheel 512 Feb 22 13:22 ftp/
267: Xdrwxrwxrwt 2 anoncvs wheel 1024 Jan 1 13:18 lost+found/
268: Xdrwxr-xr-x 4 root wheel 512 Nov 30 1995 src/
269: Xdrwxrwxr-x 3 deraadt wheel 512 Dec 4 1995 sup/
270: X[eap open 7 ]> cd anoncvs
271: X[eap anoncvs 8 ]> ls -alF
272: Xtotal 20
273: Xdrwxr-xr-x 9 root wheel 512 Jan 3 21:55 ./
274: Xdrwxr-xr-x 7 root wheel 512 Feb 20 09:58 ../
275: X-r--r--r-- 1 root wheel 0 Nov 30 1995 .hushlogin
276: X-r--r--r-- 1 root wheel 188 Nov 30 1995 .plan
277: X-r--r--r-- 1 root wheel 0 Nov 29 1995 .profile
1.10 beck 278: Xdrwxrwxr-x 2 deraadt wheel 512 Nov 29 1995 bin/
1.3 deraadt 279: Xdrwxrwxr-x 6 deraadt cvs 512 Jun 16 20:28 cvs/
280: Xdrwxr-xr-x 2 root wheel 512 Nov 30 1995 dev/
281: Xdrwxr-xr-x 2 root wheel 512 Nov 29 1995 etc/
282: Xdrwxrwxrwx 3 root wheel 512 Jun 22 07:42 tmp/
283: Xdrwxr-xr-x 5 deraadt wheel 512 Nov 30 1995 usr/
284: Xdrwxr-xr-x 2 root wheel 512 Jan 3 21:55 var/
285: X[eap anoncvs 8 ]> ls -alFR bin usr tmp etc dev
286: Xbin:
287: Xtotal 948
1.10 beck 288: Xdrwxrwxr-x 2 deraadt wheel 512 Nov 29 1995 ./
1.3 deraadt 289: Xdrwxr-xr-x 9 root wheel 512 Jan 3 21:55 ../
290: X--wx--x--x 1 deraadt wheel 40960 Jun 18 09:45 cat*
291: X--wx--x--x 1 deraadt wheel 40960 Jun 18 09:45 pwd*
292: X--wx--x--x 1 deraadt wheel 122880 Jun 18 09:45 rm*
293: X--wx--x--x 1 deraadt wheel 262144 Jun 18 09:45 sh*
294: X
295: Xdev:
296: Xtotal 4
297: Xdrwxr-xr-x 2 root wheel 512 Nov 30 1995 ./
298: Xdrwxr-xr-x 9 root wheel 512 Jan 3 21:55 ../
299: Xcrw-rw-rw- 1 root wheel 2, 2 Nov 30 1995 null
300: X
301: Xetc:
302: Xtotal 112
303: Xdrwxr-xr-x 2 root wheel 512 Nov 29 1995 ./
304: Xdrwxr-xr-x 9 root wheel 512 Jan 3 21:55 ../
305: X-rw-r--r-- 1 root wheel 252 Nov 29 1995 group
306: X-rw-r--r-- 1 root wheel 296 Nov 29 1995 hosts
307: X-rw-r--r-- 1 root wheel 540 Nov 29 1995 passwd
308: X-rw-r--r-- 1 root wheel 1094 Nov 29 1995 protocols
309: X-rw-r--r-- 1 root wheel 40960 Nov 29 1995 pwd.db
310: X-rw-r--r-- 1 root wheel 89 Nov 29 1995 resolv.conf
311: X-rw-r--r-- 1 root wheel 5529 Nov 29 1995 services
312: X-rw-r--r-- 1 root wheel 1361 Nov 29 1995 ttys
313: X
314: Xusr:
315: Xtotal 10
316: Xdrwxr-xr-x 5 deraadt wheel 512 Nov 30 1995 ./
317: Xdrwxr-xr-x 9 root wheel 512 Jan 3 21:55 ../
318: Xdrwxr-xr-x 2 deraadt wheel 512 Nov 30 1995 bin/
319: Xdrwxr-xr-x 2 deraadt wheel 1024 Jun 18 09:50 lib/
320: Xdrwxr-xr-x 2 deraadt wheel 512 Nov 29 1995 libexec/
321: X
322: Xusr/bin:
323: Xtotal 1968
324: Xdrwxr-xr-x 2 deraadt wheel 512 Nov 30 1995 ./
325: Xdrwxr-xr-x 5 deraadt wheel 512 Nov 30 1995 ../
326: X--wx--x--x 1 deraadt wheel 317787 Jun 18 09:46 cvs*
327: X
328: Xusr/lib:
329: Xtotal 5594
330: Xdrwxr-xr-x 2 deraadt wheel 1024 Jun 18 09:50 ./
331: Xdrwxr-xr-x 5 deraadt wheel 512 Nov 30 1995 ../
1.13 millert 332: X-rw-r--r-- 1 deraadt wheel 351730 Jun 18 09:50 libasn1.so.2.0
333: X-rw-r--r-- 1 deraadt wheel 351730 Jun 18 09:50 libc.so.28.5
334: X-rw-r--r-- 1 deraadt wheel 16608 Jun 18 09:50 libcrypto.so.6.0
335: X-rw-r--r-- 1 deraadt wheel 44424 Jun 18 09:50 libdes.so.7.0
336: X-rw-r--r-- 1 deraadt wheel 16665 Jun 18 09:50 libgssapi.so.1.0
337: X-rw-r--r-- 1 deraadt wheel 86198 Jun 18 09:50 libkafs.so.10.0
338: X-rw-r--r-- 1 deraadt wheel 42254 Jun 18 09:50 libkrb.so.10.0
339: X-rw-r--r-- 1 deraadt wheel 66099 Jun 18 09:50 libkrb5.so.4.0
340: X-rw-r--r-- 1 deraadt wheel 387976 Jun 18 09:50 libz.so.1.4
1.3 deraadt 341: X
342: Xusr/libexec:
343: Xtotal 100
344: Xdrwxr-xr-x 2 deraadt wheel 512 Nov 29 1995 ./
345: Xdrwxr-xr-x 5 deraadt wheel 512 Nov 30 1995 ../
346: X-rwxr-xr-x 1 deraadt wheel 49152 Jun 18 09:47 ld.so*
347: X
348: X[eap anoncvs 14 ]> ls cvs
349: XCVSROOT/ src/ sup/ www/
1.6 deraadt 350: X[eap anoncvs 15 ]> cd /open
1.3 deraadt 351: X[eap anoncvs 16 ]> ls -alF sup
352: Xtotal 8
353: Xdrwxrwxr-x 3 deraadt wheel 512 Dec 4 1995 ./
354: Xdrwxr-xr-x 7 root wheel 512 Feb 20 09:58 ../
355: Xdrwxr-xr-x 2 deraadt wheel 512 Jun 22 06:05 cvs/
356: X-rw-rw-r-- 1 deraadt wheel 54 Dec 4 1995 ss
357: X
358: X
1.7 beck 359: X***************************************************************
360: XNOTES FOR OTHER PLATFORMS:
361: X
362: XIf you're not that familiar with your other platform (i.e. you haven't
1.13 millert 363: Xbuilt a chroot jail for a server on it) you may be better off
1.7 beck 364: Xfinding an OpenBSD machine to use. (and duplicating the example above)
365: X
366: X**SunOS 5)
1.10 beck 367: XBob Beck <Bob.Beck@ualberta.ca> has done this. E-mail for
1.7 beck 368: Xhelp if you need it.
1.6 deraadt 369: X
1.7 beck 370: X**OSF 1)
1.6 deraadt 371: XFrom Todd Fries <toddf@acm.org> to the adventurous.
372: XA note for those installing anoncvs on non-OpenBSD operating systems.
373: XYou are in for some fun.
374: X
375: XFor OSF1, on a DEC alpha, I had to do the following in addition to the
376: Xabove:
377: X
378: X- I do not know how to setup dynamic libraries on osf1 and as a result
379: X everything had to be compiled statically.
380: X- Therefore, everything but /bin/sh I had to recmpile in order to
381: X get the chroot setup. In order that there be no guesswork
382: X involved, the following packages' binaries must exist in the chroot
383: X environment:
384: X
385: X GNU
386: X cvs (from the OpenBSD source tree)
387: X
388: XSome notes on compiling.
389: X
390: X cvs fails to install if you don't have makeinfo ... just search for the
391: X string ' install-info$' with regex and remove it from the Makefile for the
392: X install and you'll be fine, or install 'texinfo', your choice.
1.1 deraadt 393: END-of-README
394: echo x - anoncvssh.c
395: sed 's/^X//' >anoncvssh.c << 'END-of-anoncvssh.c'
396: X/*
1.15 ! millert 397: X * Copyright (c) 2002 Todd C. Miller <Todd.Miller@courtesan.com>
! 398: X * Copyright (c) 1997 Bob Beck <beck@obtuse.com>
! 399: X * Copyright (c) 1996 Thorsten Lockert <tholo@sigmasoft.com>
! 400: X *
! 401: X * Permission to use, copy, modify, and distribute this software for any
! 402: X * purpose with or without fee is hereby granted, provided that the above
! 403: X * copyright notice and this permission notice appear in all copies.
! 404: X *
! 405: X * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
! 406: X * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 407: X * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
! 408: X * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 409: X * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 410: X * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
! 411: X * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1 deraadt 412: X */
413: X
1.4 deraadt 414: X#include <stdio.h>
415: X#include <stdlib.h>
416: X#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__)
417: X#include <paths.h>
418: X#endif
419: X#include <pwd.h>
420: X#include <unistd.h>
421: X#include <sys/types.h>
422: X
423: X#ifndef __CONCAT
424: X#if defined(__STDC__) || defined(__cplusplus)
425: X#define __CONCAT(x,y) x ## y
426: X#else
427: X#define __CONCAT(x,y) x/**/y
428: X#endif
429: X#endif
430: X
431: X#ifndef __CONCAT3
432: X#if defined(__STDC__) || defined(__cplusplus)
433: X#define __CONCAT3(x,y,z) x ## y ## z
434: X#else
435: X#define __CONCAT3(x,y,z) x/**/y/**/z
436: X#endif
437: X#endif
438: X
439: X#ifndef __P
440: X#if defined(__STDC__) || defined(__cplusplus)
441: X#define __P(protos) protos /* full-blown ANSI C */
442: X#else
443: X#define __P(protos) () /* traditional C preprocessor */
444: X#endif
445: X#endif
446: X
447: X/*
448: X * You may need to change this path to ensure that RCS, CVS and diff
449: X * can be found
450: X */
451: X#ifndef _PATH_DEFPATH
452: X#define _PATH_DEFPATH "/bin:/usr/bin"
453: X#endif
454: X
455: X/*
456: X * This should not normally have to be changed
457: X */
458: X#ifndef _PATH_BSHELL
459: X#define _PATH_BSHELL "/bin/sh"
460: X#endif
461: X
462: X/*
463: X * Location of CVS tree, relative to the anonymous CVS user's
464: X * home directory
465: X */
466: X#ifndef LOCALROOT
467: X#define LOCALROOT "/cvs"
468: X#endif
469: X
470: X/*
471: X * Account and host name to be used when accessing the
472: X * CVS repository remotely
473: X */
474: X#ifndef HOSTNAME
475: X#define HOSTNAME "anoncvs@anoncvs1.usa.openbsd.org"
476: X#endif
477: X
478: X/*
479: X * $CVSROOT is created based on HOSTNAME and LOCALROOT above
480: X */
1.1 deraadt 481: X#ifndef CVSROOT
1.4 deraadt 482: X#define CVSROOT __CONCAT3(HOSTNAME,":",LOCALROOT)
1.1 deraadt 483: X#endif
484: X
1.8 beck 485: X/*
486: X * We define PSERVER_SUPPORT to allow anoncvssh to spawn a "cvs pserver".
487: X * You may undefine this if you aren't going to be running pserver.
488: X */
489: X#ifndef PSERVER_SUPPORT
490: X#define PSERVER_SUPPORT
491: X#endif
492: X
493: X/*
494: X * Define USE_SYSLOG if you want anoncvssh to log pserver connections
495: X * using syslog()
496: X */
497: X#define USE_SYSLOG
498: X
499: X#ifdef USE_SYSLOG
500: X#include <string.h>
501: X#include <syslog.h>
502: X#include <netinet/in.h>
503: X#include <sys/socket.h>
504: X#include <arpa/inet.h>
505: X#define LOG_FACILITY LOG_DAEMON
506: X#define LOG_PRIO LOG_INFO
507: X#endif
508: X
509: X/* Define ANONCVS_USER if you want anoncvssh to complain if invoked by
510: X * anyone other than root or ANONCVS_USER.
511: X */
512: X/* #define ANONCVS_USER "anoncvs" */
513: X
1.4 deraadt 514: Xint main __P((int, char *[]));
515: X
516: Xchar * const env[] = {
517: X __CONCAT("PATH=",_PATH_DEFPATH),
518: X __CONCAT("SHELL=",_PATH_BSHELL),
519: X __CONCAT("CVSROOT=",LOCALROOT),
520: X "HOME=/",
521: X "CVSREADONLYFS=1",
522: X NULL
523: X};
1.1 deraadt 524: X
525: Xint
526: Xmain(argc, argv)
527: Xint argc;
528: Xchar *argv[];
529: X{
530: X struct passwd *pw;
1.5 deraadt 531: X#ifdef DEBUG
532: X int i;
533: X#endif /* DEBUG */
1.1 deraadt 534: X
535: X pw = getpwuid(getuid());
536: X if (pw == NULL) {
537: X fprintf(stderr, "no user for uid %d\n", getuid());
538: X exit(1);
539: X }
540: X if (pw->pw_dir == NULL) {
541: X fprintf(stderr, "no directory\n");
542: X exit(1);
543: X }
1.8 beck 544: X
545: X#ifdef USE_SYSLOG
546: X openlog("anoncvssh", LOG_PID | LOG_NDELAY, LOG_FACILITY);
547: X#endif /* USE_SYSLOG */
548: X
549: X#ifdef ANONCVS_USER
550: X /*
551: X * I love lusers who have to test every setuid binary on my machine.
552: X */
553: X if (getuid() != 0 && (strcmp (pw->pw_name, ANONCVS_USER) != 0)) {
554: X fprintf(stderr, "You're not supposed to be running me!\n");
555: X#ifdef USE_SYSLOG
556: X syslog(LOG_NOTICE,
557: X "User %s(%d) invoked anoncvssh - Possible twink?",
558: X pw->pw_name, pw->pw_uid);
559: X#endif /* USE_SYSLOG */
560: X exit(1);
561: X }
562: X#endif /* ANONCVS_USER */
563: X
564: X
1.11 millert 565: X setuid(0);
1.1 deraadt 566: X if (chroot(pw->pw_dir) == -1) {
567: X perror("chroot");
568: X exit (1);
569: X }
570: X chdir("/");
1.11 millert 571: X setuid(pw->pw_uid);
1.1 deraadt 572: X
573: X /*
574: X * program now "safe"
575: X */
1.6 deraadt 576: X
1.8 beck 577: X#ifdef PSERVER_SUPPORT
1.6 deraadt 578: X /* If we want pserver functionality */
1.8 beck 579: X if ((argc == 2) && (strcmp("pserver", argv[1]) == 0)) {
580: X#ifdef USE_SYSLOG
581: X int slen;
582: X struct sockaddr_in my_sa, peer_sa;
583: X char *us, *them;
584: X
585: X slen = sizeof(my_sa);
586: X if (getsockname(0, (struct sockaddr *) &my_sa, &slen)
587: X != 0) {
588: X perror("getsockname");
589: X exit(1);
590: X }
591: X us = strdup(inet_ntoa(my_sa.sin_addr));
592: X if (us == NULL) {
593: X fprintf(stderr, "malloc failed\n");
594: X exit(1);
595: X }
596: X slen = sizeof(peer_sa);
597: X if (getpeername(0, (struct sockaddr *) &peer_sa, &slen)
598: X != 0) {
599: X perror("getpeername");
600: X exit(1);
601: X }
602: X them=strdup(inet_ntoa(peer_sa.sin_addr));
603: X if (them == NULL) {
604: X fprintf(stderr, "malloc failed\n");
605: X exit(1);
606: X }
607: X syslog(LOG_PRIO,
608: X "pserver connection from %s:%d to %s:%d\n",
609: X them, ntohs(peer_sa.sin_port),
610: X us, ntohs(my_sa.sin_port));
611: X#endif /* USE_SYSLOG */
1.11 millert 612: X execle("/usr/bin/cvs", "cvs",
613: X __CONCAT("--allow-root=",LOCALROOT), "pserver", NULL, env);
1.6 deraadt 614: X perror("execle: cvs");
615: X fprintf(stderr, "unable to exec CVS pserver!\n");
616: X exit(1);
617: X /* NOTREACHED */
618: X }
1.8 beck 619: X#endif
1.1 deraadt 620: X
621: X if (argc != 3 ||
622: X strcmp("anoncvssh", argv[0]) != 0 ||
623: X strcmp("-c", argv[1]) != 0 ||
1.5 deraadt 624: X (strcmp("cvs server", argv[2]) != 0 &&
625: X strcmp(__CONCAT3("cvs -d ",LOCALROOT," server"), argv[2]) != 0)) {
1.1 deraadt 626: X fprintf(stderr, "\nTo use anonymous CVS install the latest ");
627: X fprintf(stderr,"version of CVS on your local machine.\n");
628: X fprintf(stderr,"Then set your CVSROOT environment variable ");
629: X fprintf(stderr,"to the following value:\n");
630: X fprintf(stderr,"\t%s\n\n", CVSROOT);
1.5 deraadt 631: X#ifdef DEBUG
632: X fprintf(stderr, "argc = %d\n", argc);
633: X for (i = 0 ; i < argc ; i++)
634: X fprintf(stderr, "argv[%d] = \"%s\"\n", i, argv[i]);
635: X#endif /* DEBUG */
1.1 deraadt 636: X sleep(10);
637: X exit(0);
638: X }
1.4 deraadt 639: X execle("/usr/bin/cvs", "cvs", "server", NULL, env);
640: X perror("execle: cvs");
1.1 deraadt 641: X fprintf(stderr, "unable to exec CVS server!\n");
642: X exit(1);
1.5 deraadt 643: X /* NOTREACHED */
1.1 deraadt 644: X}
645: X
646: END-of-anoncvssh.c
647: exit
648:
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