Annotation of www/anoncvs.shar, Revision 1.9
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
32: Xappropriate place.
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
39: Xanoncvssh as it's shell. Decide on a user that will run sup to maintain
40: Xthe archive (this is a different user, NOT the anoncvs user)
41: X
42: X4) Make a home directory for the anoncvs user. The anoncvs user's home
43: Xdirectory is a chroot jail in which the anoncvssh processes run when
44: Xservicing anoncvs requests. The jail must contain the cvs binary and
45: Xrelated programs (rcs, etc) as well as whatever shared libraries and
46: Xsupport files are needed to run them unless you compile and link
47: Xeverything staticly. This example shows what is needed for OpenBSD. If
48: Xyou use another platform you'll need to be familiar with what needs
49: Xto go in a chroot jail for your platform.
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.
64: X you need roughly 500MB.
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
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"
76: Xto maintain the archive. The anoncvs account should *NOT* be the one
77: Xrunning 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
1.9 ! beck 83: Xyes, that is right. the account has no password. Be sure that the uid
! 84: Xand gid are unique for your system, if the ones above aren't, pick different
! 85: Xvalues.
! 86: X
! 87: XDecide on who will run sup to maintain the archive. call that user $SUPUSER.
1.7 beck 88: XOh, and in case it hasn't been previously mentioned, $SUPUSER should *NOT*
89: Xbe the anoncvs user :)
90: X
91: X**********************************************************************
92: XSTEP 4) Build the anoncvs user's home directory chroot jail. This example
93: Xassumes that you're using OpenBSD. If you're not you may need different
94: Xfiles 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
1.7 beck 101: Xstart filling the account up with nice stuff. You are building a chroot
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
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
114: X chown root.wheel .hushlogin .profile .plan
115: X
116: X mkdir bin dev tmp usr var etc
117: X cp /bin/{cat,pwd,rm,sh} bin/
118: X
119: Xusing mknod, make a dev/null that has the same major/minor numbers as
120: X your /dev/null, and make it mode 666.
121: X
122: Xsome shared library systems require a dev/zero created in the same way
123: X
124: Xfill etc space for the account
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
1.3 deraadt 129: Xanoncvssh (by setting the environment variable CVSREADONLYFS) uses an
130: Xtiny extension provided in the openbsd cvs server code which permits
131: Xthe use of read-only cvs repositories. therefore you MUST compile the
132: Xopenbsd version of cvs. luckily this is not a problem on a
133: Xnon-openbsd machine since the cvs sources are imported verbatim into
134: Xthe openbsd tree. they are in gnu/usr.bin/cvs. The sources are
135: Xintegrated such that Makefile.bsd-wrapper knows how to build the
136: Xsources on an OpenBSD machine, using obj directories.
1.1 deraadt 137: X
138: Xcreate tmp space for the account
139: X cd var; ln -s ../tmp tmp
140: X chmod a+rwx tmp
141: X
142: X mkdir usr/{bin,lib}
143: X cp /usr/bin/{ci,co,cvs,diff,diff3,gzip,rcs,rcsclean} usr/bin/
144: X cp /usr/bin/{rcsdiff,rcsfreeze,rcsmerge,rlog,sdiff,zdiff} usr/bin/
1.6 deraadt 145: X cp /usr/bin/grep usr/bin
1.1 deraadt 146: X
147: Xif your system has ld.so in /usr/libexec,
148: X mkdir usr/libexec
149: X cp /usr/libexec/ld.so usr/libexec/
150: X
151: Xif using shared libraries, copy the shared libs you might need:
152: X cp /usr/lib/lib*.so.* usr/lib/
153: X
154: Xas a final pass, make sure that all the files you have just created are
1.7 beck 155: Xnot world writable (except dev/null)
1.1 deraadt 156: X
1.7 beck 157: XFor :pserver: support (optional)
158: X - Create an entry in /etc/services
159: X cvspserver 2401/tcp # CVS client/server operations
160: X - Create an entry in /etc/inetd.conf
161: X cvspserver stream tcp nowait anoncvs /open/anoncvssh anoncvssh pserver
162: X
163: XSee the example layout below for full details.
164: X
165: X**********************************************************************
166: XSTEP 5): Get sup permission.
167: Xsend mail to sup@openbsd.org
168: X1) to have sup permissions granted on an appropriate machine for you
169: X to sup from.
1.3 deraadt 170: X2) to have an anoncvsN.COUNTRY.openbsd.org alias created
171: X3) to have your site mentioned in the http://www.openbsd.org page.
172: X
1.7 beck 173: X**********************************************************************
174: XSTEP 6): Configure sup
175: X
176: XIf you're running OpenBSD, you already have a sup client in
177: X/usr/bin/sup. If not you may need to build it. On an IRIX or other
178: XSYSV machine, ensure that your kernel does not allow a user to chown a
179: Xfile to another user (You may have heard of this particular brand of
180: Xevil referred to as "chown giveaway"). this will cause sup to give
181: Xaway the files to root before chmod'ing them
182: Xreadable. michaels@openbsd.org knows how to fix this.
183: X
184: XThe file /open/sup/ss contains a line that tells sup where to get the
185: Xcvs tree from. it can contain *one* of:
186: X
187: X cvs host=anoncvs1.ca.openbsd.org hostbase=/usr/OpenBSD base=/open/anoncvs delete
188: X cvs host=cvs.openbsd.org hostbase=/ base=/open/anoncvs delete
189: X
190: X You should ask which one to use when obtaining sup permission.
191: X
192: XThe file /open/sup/cvs/refuse tells sup what files it should not get.
193: XIt should contain the single line:
194: X
195: X cvs/CVSROOT/history
196: X
197: Xif you ever fetch the file cvs/CVSROOT/history, delete it. it will
198: Xcause you problems.
199: X
200: X**********************************************************************
201: XSTEP 7): Run sup to retrieve the tree for the first time
202: X
203: XLog in as or become the $SUPUSER, and run
204: X
205: Xsup -v /open/anoncvs/sup/ss > /tmp/suplog &; tail -f /tmp/suplog
206: X
207: XIf you have sup permission, and have specified the correct host and
208: Xhostbase in /open/anoncvs/sup/ss you should see a list of files start
209: Xcoming in after a short while. Don't panic if nothing happens
210: Ximmediately. Watch for errors (sup can timeout or die). If you can't
211: Xaccess files contact the sup server maintainer, If you get a timeout
212: Xor if sup dies you can restart and it should continue where it left off.
213: X
214: XIt can take a good while (and a couple of restarts) to obtain the
215: Xwhole tree for the first time.
216: X
217: X**********************************************************************
218: XSTEP 8): Set up cron to keep the tree up to date.
219: X
220: XYou run sup periodically from the cron by setting up the crontab file
221: Xof the $SUPUSER.
222: X
223: XFor example: To run every three hours 'sup -v supfile', and thrice
224: Xweekly 'sup -vo supfile' .. because sup is not reliable ..
225: X
226: X0 0,3,6,9,12,15,18,21 * * 0,2,4,5 sup -v /open/anoncvs/sup/ss > /dev/null
227: X0 0,12,15,18,21 * * 1,3,6 sup -v /open/anoncvs/sup/ss > /dev/null
228: X0 3 * * 1,3,6 sup -vo /open/anoncvs/sup/ss > /dev/null
229: X
230: Xanoncvs5.usa.openbsd.org uses this particular set of entries. A `sup
231: X-o' is done every few days because sup is not very robust.
232: X
233: X**********************************************************************
234: XEXAMPLE LAYOUT
235: X
236: XExample layout for OpenBSD. In this example "deraadt" is the $SUPUSER.
1.3 deraadt 237: X
238: X[eap open 5 ]> cd /open
239: X[eap open 6 ]> ls -alF
240: Xtotal 46
241: Xdrwxr-xr-x 7 root wheel 512 Feb 20 09:58 ./
242: Xdrwxr-xr-x 17 root wheel 512 Jun 14 14:05 ../
243: Xdrwxr-xr-x 9 root wheel 512 Jan 3 21:55 anoncvs/
244: X---s--x--x 1 root bin 16384 Nov 30 1995 anoncvssh*
245: Xlrwxr-xr-x 1 root wheel 11 Jan 3 21:52 cvs@ -> anoncvs/cvs
246: Xdrwxr-xr-x 5 root wheel 512 Feb 22 13:22 ftp/
247: Xdrwxrwxrwt 2 anoncvs wheel 1024 Jan 1 13:18 lost+found/
248: Xdrwxr-xr-x 4 root wheel 512 Nov 30 1995 src/
249: Xdrwxrwxr-x 3 deraadt wheel 512 Dec 4 1995 sup/
250: X[eap open 7 ]> cd anoncvs
251: X[eap anoncvs 8 ]> ls -alF
252: Xtotal 20
253: Xdrwxr-xr-x 9 root wheel 512 Jan 3 21:55 ./
254: Xdrwxr-xr-x 7 root wheel 512 Feb 20 09:58 ../
255: X-r--r--r-- 1 root wheel 0 Nov 30 1995 .hushlogin
256: X-r--r--r-- 1 root wheel 188 Nov 30 1995 .plan
257: X-r--r--r-- 1 root wheel 0 Nov 29 1995 .profile
258: Xdrwxrwxrwx 2 deraadt wheel 512 Nov 29 1995 bin/
259: Xdrwxrwxr-x 6 deraadt cvs 512 Jun 16 20:28 cvs/
260: Xdrwxr-xr-x 2 root wheel 512 Nov 30 1995 dev/
261: Xdrwxr-xr-x 2 root wheel 512 Nov 29 1995 etc/
262: Xdrwxrwxrwx 3 root wheel 512 Jun 22 07:42 tmp/
263: Xdrwxr-xr-x 5 deraadt wheel 512 Nov 30 1995 usr/
264: Xdrwxr-xr-x 2 root wheel 512 Jan 3 21:55 var/
265: X[eap anoncvs 8 ]> ls -alFR bin usr tmp etc dev
266: Xbin:
267: Xtotal 948
268: Xdrwxrwxrwx 2 deraadt wheel 512 Nov 29 1995 ./
269: Xdrwxr-xr-x 9 root wheel 512 Jan 3 21:55 ../
270: X--wx--x--x 1 deraadt wheel 40960 Jun 18 09:45 cat*
271: X--wx--x--x 1 deraadt wheel 40960 Jun 18 09:45 pwd*
272: X--wx--x--x 1 deraadt wheel 122880 Jun 18 09:45 rm*
273: X--wx--x--x 1 deraadt wheel 262144 Jun 18 09:45 sh*
274: X
275: Xdev:
276: Xtotal 4
277: Xdrwxr-xr-x 2 root wheel 512 Nov 30 1995 ./
278: Xdrwxr-xr-x 9 root wheel 512 Jan 3 21:55 ../
279: Xcrw-rw-rw- 1 root wheel 2, 2 Nov 30 1995 null
280: X
281: Xetc:
282: Xtotal 112
283: Xdrwxr-xr-x 2 root wheel 512 Nov 29 1995 ./
284: Xdrwxr-xr-x 9 root wheel 512 Jan 3 21:55 ../
285: X-rw-r--r-- 1 root wheel 252 Nov 29 1995 group
286: X-rw-r--r-- 1 root wheel 296 Nov 29 1995 hosts
287: X-rw-r--r-- 1 root wheel 540 Nov 29 1995 passwd
288: X-rw-r--r-- 1 root wheel 1094 Nov 29 1995 protocols
289: X-rw-r--r-- 1 root wheel 40960 Nov 29 1995 pwd.db
290: X-rw-r--r-- 1 root wheel 89 Nov 29 1995 resolv.conf
291: X-rw-r--r-- 1 root wheel 5529 Nov 29 1995 services
292: X-rw-r--r-- 1 root wheel 1361 Nov 29 1995 ttys
293: X
294: Xusr:
295: Xtotal 10
296: Xdrwxr-xr-x 5 deraadt wheel 512 Nov 30 1995 ./
297: Xdrwxr-xr-x 9 root wheel 512 Jan 3 21:55 ../
298: Xdrwxr-xr-x 2 deraadt wheel 512 Nov 30 1995 bin/
299: Xdrwxr-xr-x 2 deraadt wheel 1024 Jun 18 09:50 lib/
300: Xdrwxr-xr-x 2 deraadt wheel 512 Nov 29 1995 libexec/
301: X
302: Xusr/bin:
303: Xtotal 1968
304: Xdrwxr-xr-x 2 deraadt wheel 512 Nov 30 1995 ./
305: Xdrwxr-xr-x 5 deraadt wheel 512 Nov 30 1995 ../
306: X--wx--x--x 1 deraadt wheel 73728 Jun 18 09:46 ci*
307: X--wx--x--x 1 deraadt wheel 73728 Jun 18 09:46 co*
308: X--wx--x--x 1 deraadt wheel 317787 Jun 18 09:46 cvs*
309: X--wx--x--x 1 deraadt wheel 73728 Jun 18 09:46 diff*
310: X--wx--x--x 1 deraadt wheel 24576 Jun 18 09:46 diff3*
311: X--wx--x--x 1 deraadt wheel 90112 Jun 18 09:46 gzip*
312: X--wx--x--x 1 deraadt wheel 73728 Jun 18 09:46 rcs*
313: X--wx--x--x 1 deraadt wheel 65536 Jun 18 09:46 rcsclean*
314: X--wx--x--x 1 deraadt wheel 57344 Jun 18 09:46 rcsdiff*
315: X--wx--x--x 1 deraadt wheel 3228 Jun 18 09:46 rcsfreeze*
316: X--wx--x--x 1 deraadt wheel 57344 Jun 18 09:46 rcsmerge*
317: X--wx--x--x 1 deraadt wheel 57344 Jun 18 09:46 rlog*
318: X--wx--x--x 1 deraadt wheel 24576 Jun 18 09:46 sdiff*
319: X--wx--x--x 1 deraadt wheel 2006 Jun 18 09:46 zdiff*
320: X
321: Xusr/lib:
322: Xtotal 5594
323: Xdrwxr-xr-x 2 deraadt wheel 1024 Jun 18 09:50 ./
324: Xdrwxr-xr-x 5 deraadt wheel 512 Nov 30 1995 ../
325: X-rw-r--r-- 1 deraadt wheel 16665 Jun 18 09:50 libacl.so.4.0
326: X-rw-r--r-- 1 deraadt wheel 351730 Jun 18 09:50 libc.so.12.3
327: X-rw-r--r-- 1 deraadt wheel 377359 Jun 18 09:50 libc.so.12.6
328: X-rw-r--r-- 1 deraadt wheel 16608 Jun 18 09:50 libcrypt.so.0.0
329: X-rw-r--r-- 1 deraadt wheel 16465 Jun 18 09:50 libcrypt.so.1.0
330: X-rw-r--r-- 1 deraadt wheel 44424 Jun 18 09:50 libcurses.so.2.1
331: X-rw-r--r-- 1 deraadt wheel 86198 Jun 18 09:50 libcurses.so.3.0
332: X-rw-r--r-- 1 deraadt wheel 42254 Jun 18 09:50 libdes.so.4.1
333: X-rw-r--r-- 1 deraadt wheel 66099 Jun 18 09:50 libedit.so.0.0
334: X-rw-r--r-- 1 deraadt wheel 43131 Jun 18 09:50 libform.so.0.0
335: X-rw-r--r-- 1 deraadt wheel 387976 Jun 18 09:50 libg++.so.2.0
336: X-rw-r--r-- 1 deraadt wheel 305738 Jun 18 09:50 libg++.so.27.1
337: X-rw-r--r-- 1 deraadt wheel 25544 Jun 18 09:50 libgnumalloc.so.0.0
338: X-rw-r--r-- 1 deraadt wheel 42696 Jun 18 09:50 libiberty.so.0.0
339: X-rw-r--r-- 1 deraadt wheel 25282 Jun 18 09:50 libkadm.so.4.0
340: X-rw-r--r-- 1 deraadt wheel 16610 Jun 18 09:50 libkafs.so.4.0
341: X-rw-r--r-- 1 deraadt wheel 25539 Jun 18 09:50 libkdb.so.4.0
342: X-rw-r--r-- 1 deraadt wheel 59943 Jun 18 09:50 libkrb.so.4.0
343: X-rw-r--r-- 1 deraadt wheel 25328 Jun 18 09:50 libkvm.so.4.0
344: X-rw-r--r-- 1 deraadt wheel 102104 Jun 18 09:50 libm.so.0.1
345: X-rw-r--r-- 1 deraadt wheel 26540 Jun 18 09:50 libmenu.so.0.0
346: X-rw-r--r-- 1 deraadt wheel 44424 Jun 18 09:50 libocurses.so.2.1
347: X-rw-r--r-- 1 deraadt wheel 16881 Jun 18 09:50 libpanel.so.0.0
348: X-rw-r--r-- 1 deraadt wheel 60222 Jun 18 09:50 libpcap.so.0.0
349: X-rw-r--r-- 1 deraadt wheel 25060 Jun 18 09:50 libresolv.so.1.0
350: X-rw-r--r-- 1 deraadt wheel 16465 Jun 18 09:50 libresolv.so.2.0
351: X-rw-r--r-- 1 deraadt wheel 33538 Jun 18 09:50 libskey.so.0.0
352: X-rw-r--r-- 1 deraadt wheel 25764 Jun 18 09:50 libss.so.4.0
353: X-rw-r--r-- 1 deraadt wheel 277954 Jun 18 09:50 libstdc++.so.27.1
354: X-rw-r--r-- 1 deraadt wheel 16835 Jun 18 09:50 libtelnet.so.1.0
355: X-rw-r--r-- 1 deraadt wheel 16691 Jun 18 09:50 libtermcap.so.0.0
356: X-rw-r--r-- 1 deraadt wheel 16691 Jun 18 09:50 libtermlib.so.0.0
357: X-rw-r--r-- 1 deraadt wheel 75039 Jun 18 09:50 libtermlib.so.1.0
358: X-rw-r--r-- 1 deraadt wheel 16625 Jun 18 09:50 libutil.so.3.1
359: X-rw-r--r-- 1 deraadt wheel 25628 Jun 18 09:50 libutil.so.3.2
360: X
361: Xusr/libexec:
362: Xtotal 100
363: Xdrwxr-xr-x 2 deraadt wheel 512 Nov 29 1995 ./
364: Xdrwxr-xr-x 5 deraadt wheel 512 Nov 30 1995 ../
365: X-rwxr-xr-x 1 deraadt wheel 49152 Jun 18 09:47 ld.so*
366: X
367: X[eap anoncvs 14 ]> ls cvs
368: XCVSROOT/ src/ sup/ www/
1.6 deraadt 369: X[eap anoncvs 15 ]> cd /open
1.3 deraadt 370: X[eap anoncvs 16 ]> ls -alF sup
371: Xtotal 8
372: Xdrwxrwxr-x 3 deraadt wheel 512 Dec 4 1995 ./
373: Xdrwxr-xr-x 7 root wheel 512 Feb 20 09:58 ../
374: Xdrwxr-xr-x 2 deraadt wheel 512 Jun 22 06:05 cvs/
375: X-rw-rw-r-- 1 deraadt wheel 54 Dec 4 1995 ss
376: X
377: X
1.7 beck 378: X***************************************************************
379: XNOTES FOR OTHER PLATFORMS:
380: X
381: XIf you're not that familiar with your other platform (i.e. you haven't
382: Xbuilt a chroot jail for a server on it) You may be better off
383: Xfinding an OpenBSD machine to use. (and duplicating the example above)
384: X
385: X**SunOS 5)
386: XBob Beck <beck@panopticon.ucs.ualberta.ca> has done this. E-mail for
387: Xhelp if you need it.
1.6 deraadt 388: X
1.7 beck 389: X**OSF 1)
1.6 deraadt 390: XFrom Todd Fries <toddf@acm.org> to the adventurous.
391: XA note for those installing anoncvs on non-OpenBSD operating systems.
392: XYou are in for some fun.
393: X
394: XFor OSF1, on a DEC alpha, I had to do the following in addition to the
395: Xabove:
396: X
397: X- I do not know how to setup dynamic libraries on osf1 and as a result
398: X everything had to be compiled statically.
399: X- Therefore, everything but /bin/sh I had to recmpile in order to
400: X get the chroot setup. In order that there be no guesswork
401: X involved, the following packages' binaries must exist in the chroot
402: X environment:
403: X
404: X GNU
405: X cvs (from the OpenBSD source tree)
406: X diff[utils] (unless you're running *BSD, probably better get it from a gnu
407: X mirror...the Makefile doesn't work otherwise)
408: X rcs (from the OpenBSD source tree)
409: X
410: XSome notes on compiling.
411: X
412: X rcs must have diff3 capable of diff3 -m during configure.
413: X OSF doesn't by default, thus I had to compile diffutils first.
414: X
415: X cvs fails to install if you don't have makeinfo ... just search for the
416: X string ' install-info$' with regex and remove it from the Makefile for the
417: X install and you'll be fine, or install 'texinfo', your choice.
1.1 deraadt 418: END-of-README
419: echo x - anoncvssh.c
420: sed 's/^X//' >anoncvssh.c << 'END-of-anoncvssh.c'
421: X/*
422: X * anoncvssh
423: X */
424: X
1.4 deraadt 425: X#include <stdio.h>
426: X#include <stdlib.h>
427: X#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__)
428: X#include <paths.h>
429: X#endif
430: X#include <pwd.h>
431: X#include <unistd.h>
432: X#include <sys/types.h>
433: X
434: X#ifndef __CONCAT
435: X#if defined(__STDC__) || defined(__cplusplus)
436: X#define __CONCAT(x,y) x ## y
437: X#else
438: X#define __CONCAT(x,y) x/**/y
439: X#endif
440: X#endif
441: X
442: X#ifndef __CONCAT3
443: X#if defined(__STDC__) || defined(__cplusplus)
444: X#define __CONCAT3(x,y,z) x ## y ## z
445: X#else
446: X#define __CONCAT3(x,y,z) x/**/y/**/z
447: X#endif
448: X#endif
449: X
450: X#ifndef __P
451: X#if defined(__STDC__) || defined(__cplusplus)
452: X#define __P(protos) protos /* full-blown ANSI C */
453: X#else
454: X#define __P(protos) () /* traditional C preprocessor */
455: X#endif
456: X#endif
457: X
458: X/*
459: X * You may need to change this path to ensure that RCS, CVS and diff
460: X * can be found
461: X */
462: X#ifndef _PATH_DEFPATH
463: X#define _PATH_DEFPATH "/bin:/usr/bin"
464: X#endif
465: X
466: X/*
467: X * This should not normally have to be changed
468: X */
469: X#ifndef _PATH_BSHELL
470: X#define _PATH_BSHELL "/bin/sh"
471: X#endif
472: X
473: X/*
474: X * Location of CVS tree, relative to the anonymous CVS user's
475: X * home directory
476: X */
477: X#ifndef LOCALROOT
478: X#define LOCALROOT "/cvs"
479: X#endif
480: X
481: X/*
482: X * Account and host name to be used when accessing the
483: X * CVS repository remotely
484: X */
485: X#ifndef HOSTNAME
486: X#define HOSTNAME "anoncvs@anoncvs1.usa.openbsd.org"
487: X#endif
488: X
489: X/*
490: X * $CVSROOT is created based on HOSTNAME and LOCALROOT above
491: X */
1.1 deraadt 492: X#ifndef CVSROOT
1.4 deraadt 493: X#define CVSROOT __CONCAT3(HOSTNAME,":",LOCALROOT)
1.1 deraadt 494: X#endif
495: X
1.8 beck 496: X/*
497: X * We define PSERVER_SUPPORT to allow anoncvssh to spawn a "cvs pserver".
498: X * You may undefine this if you aren't going to be running pserver.
499: X */
500: X#ifndef PSERVER_SUPPORT
501: X#define PSERVER_SUPPORT
502: X#endif
503: X
504: X/*
505: X * Define USE_SYSLOG if you want anoncvssh to log pserver connections
506: X * using syslog()
507: X */
508: X#define USE_SYSLOG
509: X
510: X#ifdef USE_SYSLOG
511: X#include <string.h>
512: X#include <syslog.h>
513: X#include <netinet/in.h>
514: X#include <sys/socket.h>
515: X#include <arpa/inet.h>
516: X#define LOG_FACILITY LOG_DAEMON
517: X#define LOG_PRIO LOG_INFO
518: X#endif
519: X
520: X/* Define ANONCVS_USER if you want anoncvssh to complain if invoked by
521: X * anyone other than root or ANONCVS_USER.
522: X */
523: X/* #define ANONCVS_USER "anoncvs" */
524: X
1.4 deraadt 525: Xint main __P((int, char *[]));
526: X
527: Xchar * const env[] = {
528: X __CONCAT("PATH=",_PATH_DEFPATH),
529: X __CONCAT("SHELL=",_PATH_BSHELL),
530: X __CONCAT("CVSROOT=",LOCALROOT),
531: X "HOME=/",
532: X "CVSREADONLYFS=1",
533: X NULL
534: X};
1.1 deraadt 535: X
536: Xint
537: Xmain(argc, argv)
538: Xint argc;
539: Xchar *argv[];
540: X{
541: X struct passwd *pw;
1.5 deraadt 542: X#ifdef DEBUG
543: X int i;
544: X#endif /* DEBUG */
1.1 deraadt 545: X
546: X pw = getpwuid(getuid());
547: X if (pw == NULL) {
548: X fprintf(stderr, "no user for uid %d\n", getuid());
549: X exit(1);
550: X }
551: X if (pw->pw_dir == NULL) {
552: X fprintf(stderr, "no directory\n");
553: X exit(1);
554: X }
1.8 beck 555: X
556: X#ifdef USE_SYSLOG
557: X openlog("anoncvssh", LOG_PID | LOG_NDELAY, LOG_FACILITY);
558: X#endif /* USE_SYSLOG */
559: X
560: X#ifdef ANONCVS_USER
561: X /*
562: X * I love lusers who have to test every setuid binary on my machine.
563: X */
564: X if (getuid() != 0 && (strcmp (pw->pw_name, ANONCVS_USER) != 0)) {
565: X fprintf(stderr, "You're not supposed to be running me!\n");
566: X#ifdef USE_SYSLOG
567: X syslog(LOG_NOTICE,
568: X "User %s(%d) invoked anoncvssh - Possible twink?",
569: X pw->pw_name, pw->pw_uid);
570: X#endif /* USE_SYSLOG */
571: X exit(1);
572: X }
573: X#endif /* ANONCVS_USER */
574: X
575: X
1.1 deraadt 576: X seteuid(0);
577: X if (chroot(pw->pw_dir) == -1) {
578: X perror("chroot");
579: X exit (1);
580: X }
581: X chdir("/");
1.4 deraadt 582: X setuid(getuid());
1.1 deraadt 583: X
584: X /*
585: X * program now "safe"
586: X */
1.6 deraadt 587: X
1.8 beck 588: X#ifdef PSERVER_SUPPORT
1.6 deraadt 589: X /* If we want pserver functionality */
1.8 beck 590: X if ((argc == 2) && (strcmp("pserver", argv[1]) == 0)) {
591: X#ifdef USE_SYSLOG
592: X int slen;
593: X struct sockaddr_in my_sa, peer_sa;
594: X char *us, *them;
595: X
596: X slen = sizeof(my_sa);
597: X if (getsockname(0, (struct sockaddr *) &my_sa, &slen)
598: X != 0) {
599: X perror("getsockname");
600: X exit(1);
601: X }
602: X us = strdup(inet_ntoa(my_sa.sin_addr));
603: X if (us == NULL) {
604: X fprintf(stderr, "malloc failed\n");
605: X exit(1);
606: X }
607: X slen = sizeof(peer_sa);
608: X if (getpeername(0, (struct sockaddr *) &peer_sa, &slen)
609: X != 0) {
610: X perror("getpeername");
611: X exit(1);
612: X }
613: X them=strdup(inet_ntoa(peer_sa.sin_addr));
614: X if (them == NULL) {
615: X fprintf(stderr, "malloc failed\n");
616: X exit(1);
617: X }
618: X syslog(LOG_PRIO,
619: X "pserver connection from %s:%d to %s:%d\n",
620: X them, ntohs(peer_sa.sin_port),
621: X us, ntohs(my_sa.sin_port));
622: X#endif /* USE_SYSLOG */
1.6 deraadt 623: X execle("/usr/bin/cvs", "cvs", "pserver", NULL, env);
624: X perror("execle: cvs");
625: X fprintf(stderr, "unable to exec CVS pserver!\n");
626: X exit(1);
627: X /* NOTREACHED */
628: X }
1.8 beck 629: X#endif
1.1 deraadt 630: X
631: X if (argc != 3 ||
632: X strcmp("anoncvssh", argv[0]) != 0 ||
633: X strcmp("-c", argv[1]) != 0 ||
1.5 deraadt 634: X (strcmp("cvs server", argv[2]) != 0 &&
635: X strcmp(__CONCAT3("cvs -d ",LOCALROOT," server"), argv[2]) != 0)) {
1.1 deraadt 636: X fprintf(stderr, "\nTo use anonymous CVS install the latest ");
637: X fprintf(stderr,"version of CVS on your local machine.\n");
638: X fprintf(stderr,"Then set your CVSROOT environment variable ");
639: X fprintf(stderr,"to the following value:\n");
640: X fprintf(stderr,"\t%s\n\n", CVSROOT);
1.5 deraadt 641: X#ifdef DEBUG
642: X fprintf(stderr, "argc = %d\n", argc);
643: X for (i = 0 ; i < argc ; i++)
644: X fprintf(stderr, "argv[%d] = \"%s\"\n", i, argv[i]);
645: X#endif /* DEBUG */
1.1 deraadt 646: X sleep(10);
647: X exit(0);
648: X }
1.4 deraadt 649: X execle("/usr/bin/cvs", "cvs", "server", NULL, env);
650: X perror("execle: cvs");
1.1 deraadt 651: X fprintf(stderr, "unable to exec CVS server!\n");
652: X exit(1);
1.5 deraadt 653: X /* NOTREACHED */
1.1 deraadt 654: X}
655: X
656: END-of-anoncvssh.c
657: exit
658:
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