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  1. Newsgroups: comp.sources.misc
  2. From: phil@pex.eecs.nwu.edu (William LeFebvre)
  3. Subject: v36i016:  securelib - Shared library control for network daemon access, Part02/03
  4. Message-ID: <1993Mar12.214505.8275@sparky.imd.sterling.com>
  5. X-Md4-Signature: ecdb364e8a6e9a5263147f970b6577e8
  6. Date: Fri, 12 Mar 1993 21:45:05 GMT
  7. Approved: kent@sparky.imd.sterling.com
  8.  
  9. Submitted-by: phil@pex.eecs.nwu.edu (William LeFebvre)
  10. Posting-number: Volume 36, Issue 16
  11. Archive-name: securelib/part02
  12. Environment: SunOS 4.1.x
  13.  
  14. #! /bin/sh
  15. # This is a shell archive.  Remove anything before this line, then feed it
  16. # into a shell via "sh file" or similar.  To overwrite existing files,
  17. # type "sh file -c".
  18. # Contents:  _okaddr.c extract_lib patchlevel.h securelib.ps.B start.X
  19. # Wrapped by kent@sparky on Fri Mar 12 09:49:53 1993
  20. PATH=/bin:/usr/bin:/usr/ucb:/usr/local/bin:/usr/lbin ; export PATH
  21. echo If this archive is complete, you will see the following message:
  22. echo '          "shar: End of archive 2 (of 3)."'
  23. if test -f '_okaddr.c' -a "${1}" != "-c" ; then 
  24.   echo shar: Will not clobber existing file \"'_okaddr.c'\"
  25. else
  26.   echo shar: Extracting \"'_okaddr.c'\" \(7948 characters\)
  27.   sed "s/^X//" >'_okaddr.c' <<'END_OF_FILE'
  28. X/*
  29. X *  securelib:  a package to enhance network security.
  30. X *
  31. X *  Written by William LeFebvre, EECS Department, Northwestern University
  32. X *  Internet address:  phil@eecs.nwu.edu
  33. X *
  34. X *  Configuration file code added by Sam Horrocks (sam@ics.uci.edu).
  35. X */
  36. X
  37. X/* Edit these def's to customize for your site. */
  38. X
  39. X#ifndef CONF_FILE
  40. X#define CONF_FILE "/etc/securelib.conf" /* Name of the config file           *
  41. X                     * (may be overridden by cc)         */
  42. X#endif
  43. X
  44. X#define MAX_LINES 8                     /* Maximum number of config lines    *
  45. X                                         * that can apply to one process     */
  46. X
  47. X#define ENV_NAME "SL_NAME"              /* Name of the environment variable  *
  48. X                                         * to use to filter the config file. */
  49. X
  50. X#define ALL_NAME "all"                  /* Name used in config file for      *
  51. X                                         * lines that apply to all processes */
  52. X
  53. X#define STAT_TIMEOUT (60*60)            /* Time to wait before stat'ing      *
  54. X                                         * the config file again.            */
  55. X
  56. X#define MAX_TOKEN 40                    /* Maximum size of one token in the  *
  57. X                                         * configuration file                */
  58. X
  59. X#define BUF_SIZE 80                     /* Size of buffer used to read file. */
  60. X
  61. X
  62. X#include <sys/types.h>
  63. X#include <sys/socket.h>
  64. X#include <netinet/in.h>
  65. X#include <sys/stat.h>
  66. X#include <sys/time.h>
  67. X#include <stdio.h>
  68. X#include <ctype.h>
  69. X
  70. Xstruct conf_line {                      /* Info about config file line */
  71. X    u_long adr, mask
  72. X};
  73. X
  74. Xstatic int next_token();
  75. Xextern char *getenv();
  76. Xextern time_t time();
  77. Xextern u_long inet_addr();
  78. X
  79. X
  80. X/*
  81. X * _ok_address - check the sockaddr "addr" (of length "addrlen") to see
  82. X *               if it corresponds to an acceptable host.  Return true
  83. X *               (non-zero) if acceptable, otherwise return false (zero).
  84. X *               If "addr" is NULL or if "addrlen" is not long enough,
  85. X *               then use "getpeername" on socket "s" to determine the
  86. X *               address of the connecting host.
  87. X */
  88. X
  89. X_ok_address(s, addr, addrlen)
  90. X
  91. Xint s;
  92. Xstruct sockaddr *addr;
  93. Xint addrlen;
  94. X
  95. X{
  96. X    struct sockaddr peername;    /* in case we need to use getpeername */
  97. X    int peernamelen;             /* ditto */
  98. X    u_long ip_addr;
  99. X
  100. X    /* was addr actually used and was it sufficient? */
  101. X    if (addr == (struct sockaddr *)0 || addrlen < (2+2+sizeof(struct in_addr)))
  102. X    {
  103. X    /* no, so get the info with getpeername */
  104. X    peernamelen = sizeof(peername);
  105. X    if (getpeername(s, &peername, &peernamelen) < 0)
  106. X    {
  107. X        /* not sure what the appropriate thing to do here is... */
  108. X        /* so we will return "not ok" just to be safe */
  109. X        return(0);
  110. X    }
  111. X
  112. X    /* for remainder of this function: */
  113. X    addr = &peername;
  114. X    }
  115. X
  116. X    /* now, verify the socket type */
  117. X    if (addr->sa_family == AF_INET)
  118. X    {
  119. X    static struct conf_line conf[MAX_LINES];
  120. X    static int nconf;
  121. X    static time_t last_stat_time, last_mtime;
  122. X    struct timeval now;
  123. X    int i;
  124. X
  125. X    (void) gettimeofday(&now, (struct timezone*)0);
  126. X
  127. X    /* Decide whether to read our config file */
  128. X    if (last_stat_time == 0 ||
  129. X        (now.tv_sec - last_stat_time) > STAT_TIMEOUT)
  130. X    {
  131. X        struct stat stbuf;
  132. X        char *conf_file = CONF_FILE;
  133. X        char *my_name = getenv(ENV_NAME);
  134. X        char fil_buf[BUF_SIZE], buf[MAX_TOKEN];
  135. X        FILE fil;
  136. X
  137. X        last_stat_time = now.tv_sec;
  138. X        bzero((char*)&fil, sizeof(fil));
  139. X
  140. X        /* Stat the config file.  If it changed, open it */
  141. X        if (stat(conf_file, &stbuf) != -1 &&
  142. X        last_mtime != stbuf.st_mtime &&
  143. X        freopen(conf_file, "r", &fil) == &fil)
  144. X        {
  145. X        /* Update the timestamp */
  146. X        last_mtime = stbuf.st_mtime;
  147. X        nconf = 0;
  148. X
  149. X        /* Use the buffer on the stack instead of malloc'ing */
  150. X        setbuffer(&fil, fil_buf, sizeof(fil_buf));
  151. X
  152. X        /* Grab the "name" */
  153. X        while ((i = next_token(&fil, buf, sizeof(buf))) != EOF)
  154. X        {
  155. X            /* If only token on the line, ignore */
  156. X            if (i == '\n') continue;
  157. X
  158. X            /* Comment -- read until end of line then next line */
  159. X            if (buf[0] == '#') {
  160. X            while (next_token(&fil, buf, sizeof(buf)) == 0) ;
  161. X            continue;
  162. X            }
  163. X
  164. X            /*
  165. X             * Check to make sure this says "all" or that it matches
  166. X             * the name given in the environment variable.
  167. X             */
  168. X            if (strcmp(buf, ALL_NAME) == 0 ||
  169. X                (my_name != NULL && strcmp(buf, my_name) == 0))
  170. X            {
  171. X            /* Get next token, if last on line, ignore */
  172. X            if (next_token(&fil, buf, sizeof(buf)) != 0)
  173. X                continue;
  174. X
  175. X            /* Got address */
  176. X            conf[nconf].adr = inet_addr(buf);
  177. X
  178. X            /* Get next token (mask) */
  179. X            i = next_token(&fil, buf, sizeof(buf));
  180. X
  181. X            /* Only ignore if we got no text at all */
  182. X            if (i != EOF)
  183. X            {
  184. X                /* Add to list, quit if array is full */
  185. X                conf[nconf++].mask = inet_addr(buf);
  186. X                if (nconf == MAX_LINES) break;
  187. X            }
  188. X
  189. X            /* If not at end-of-line, keep reading til we are */
  190. X            /* why isn't this outside the if(strcmp...) ??? */
  191. X            while (i == 0)
  192. X            {
  193. X                i = next_token(&fil, buf, sizeof(buf));
  194. X            }
  195. X            }
  196. X        }
  197. X        (void) fclose(&fil);
  198. X        }
  199. X    }
  200. X
  201. X    /* Config lines now in memory so start checking address */
  202. X    /* grab just the address */
  203. X    ip_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
  204. X
  205. X    /*
  206. X     * Go through the conf array, turn off the bits given by the mask
  207. X     * and then compare the result with the address.  A match means
  208. X     * that this address is ok.
  209. X     */
  210. X    for (i = 0; i < nconf; ++i)
  211. X    {
  212. X        if ((ip_addr & ~conf[i].mask) == conf[i].adr) return 1;
  213. X    }
  214. X
  215. X    /* no match, so we can't approve the address */
  216. X    return 0;
  217. X    }
  218. X    else
  219. X    {
  220. X    /* we don't know how to handle non-Internet connections, so
  221. X       we will give them all blanket approval */
  222. X    return 1;
  223. X    }
  224. X    /*NOTREACHED*/
  225. X}
  226. X
  227. X/*
  228. X * Grab one token out of fp.  Defined as the next string of non-whitespace
  229. X * in the file.  After we get the token, continue reading until EOF, end of
  230. X * line or the next token.  If it's the last token on the line, return '\n'
  231. X * for the value.  If we get EOF before reading a token, return EOF.  In all
  232. X * other cases return 0.
  233. X */
  234. Xstatic int next_token(fp, buf, bufsz)
  235. X
  236. XFILE *fp;
  237. Xchar *buf;
  238. Xint bufsz;
  239. X
  240. X{
  241. X    int c;
  242. X    char *eb = buf+(bufsz-1);
  243. X
  244. X    /* Discard inital whitespace */
  245. X    while (isspace(c = getc(fp))) ;
  246. X
  247. X    /* EOF seen before any token so return EOF */
  248. X    if (c == EOF) return -1;
  249. X
  250. X    /* Form a token in buf */
  251. X    do {
  252. X    if (buf < eb) *buf++ = c;
  253. X    c = getc(fp);
  254. X    } while (!isspace(c) && c != EOF);
  255. X    *buf = '\0';
  256. X
  257. X    /* Discard trailing tabs and spaces */
  258. X    while (c == ' ' || c == '\t') c = getc(fp);
  259. X
  260. X    /* Put back the char that was non-whitespace (putting back EOF is ok) */
  261. X    (void) ungetc(c, fp);
  262. X
  263. X    /* If we ended with a newline, return that, otherwise return 0 */
  264. X    return (c == '\n' ? '\n' : 0);
  265. X}
  266. X
  267. X/*
  268. X * _addrcpy(to, tolenptr, from, fromlen)
  269. X *
  270. X * copy an address from "from" to "to".  "fromlen" is the length of the
  271. X * from address.  "tolenptr" points to the length that is available in
  272. X * the buffer "to" and will be modified the reflect the actual number of
  273. X * bytes copied.  Under no circumstances will more than *tolenptr bytes
  274. X * be copied (even if *tolenptr == 0).
  275. X *
  276. X * This is a global routine and is used in the modified accept call.
  277. X */
  278. X
  279. X_addrcpy(to, tolenp, from, fromlen)
  280. X
  281. Xstruct sockaddr *to, *from;
  282. Xint *tolenp;
  283. Xint fromlen;
  284. X
  285. X{
  286. X    register int amt = 0;
  287. X
  288. X    /*
  289. X     *  Explanation:  amt is initialized to 0.  If to is null, then the
  290. X     *  second half of the && conditional is not done (K&R guarantees
  291. X     *  this).  Therefore, amt gets set to *tolenp iff amt != NULL.
  292. X     *  Then, if *tolenp is greater than 0, the lesser of amt (*tolenp)
  293. X     *  and fromlen is used as the length of the copy.  Thus, amt is always
  294. X     *  the number of bytes copied, even if that number is 0 (indicating
  295. X     *  that no copying was done).
  296. X     */
  297. X
  298. X    if (to != (struct sockaddr *)0 && (amt = *tolenp) > 0)
  299. X    {
  300. X    if (fromlen < amt)
  301. X    {
  302. X        amt = fromlen;
  303. X    }
  304. X    bcopy((char *)from, (char *)to, amt);
  305. X    }
  306. X    *tolenp = amt;
  307. X}
  308. END_OF_FILE
  309.   if test 7948 -ne `wc -c <'_okaddr.c'`; then
  310.     echo shar: \"'_okaddr.c'\" unpacked with wrong size!
  311.   fi
  312.   # end of '_okaddr.c'
  313. fi
  314. if test -f 'extract_lib' -a "${1}" != "-c" ; then 
  315.   echo shar: Will not clobber existing file \"'extract_lib'\"
  316. else
  317.   echo shar: Extracting \"'extract_lib'\" \(371 characters\)
  318.   sed "s/^X//" >'extract_lib' <<'END_OF_FILE'
  319. X#!/bin/csh -fv
  320. Xcd $1
  321. Xif (! -e tmp) then
  322. X    mkdir tmp
  323. X    cd tmp
  324. X    ar x ../libc_pic.a
  325. X    rm __.SYMDEF
  326. X    mv rpc_dtablesize. rpc_dtablesize.o
  327. X    mv rpc_commondata. rpc_commondata.o
  328. X        mv xccs.multibyte. xccs.multibyte.o
  329. X    cd ..
  330. Xendif
  331. Xgrep _okaddr.o lorder-sparc >/dev/null
  332. Xif ($status == 1) then
  333. X    mv lorder-sparc lorder-sparc.orig
  334. X    cat <<'EOF' >>lorder-sparc
  335. X_okaddr.o
  336. X'EOF'
  337. Xendif
  338. END_OF_FILE
  339.   if test 371 -ne `wc -c <'extract_lib'`; then
  340.     echo shar: \"'extract_lib'\" unpacked with wrong size!
  341.   fi
  342.   # end of 'extract_lib'
  343. fi
  344. if test -f 'patchlevel.h' -a "${1}" != "-c" ; then 
  345.   echo shar: Will not clobber existing file \"'patchlevel.h'\"
  346. else
  347.   echo shar: Extracting \"'patchlevel.h'\" \(21 characters\)
  348.   sed "s/^X//" >'patchlevel.h' <<'END_OF_FILE'
  349. X#define PATCHLEVEL 4
  350. END_OF_FILE
  351.   if test 21 -ne `wc -c <'patchlevel.h'`; then
  352.     echo shar: \"'patchlevel.h'\" unpacked with wrong size!
  353.   fi
  354.   # end of 'patchlevel.h'
  355. fi
  356. if test -f 'securelib.ps.B' -a "${1}" != "-c" ; then 
  357.   echo shar: Will not clobber existing file \"'securelib.ps.B'\"
  358. else
  359.   echo shar: Extracting \"'securelib.ps.B'\" \(46421 characters\)
  360.   sed "s/^X//" >'securelib.ps.B' <<'END_OF_FILE'
  361. X0007800000078000000780000007800000078000000FC00000FFFC0000191F7E9E1F>I<FFFF80
  362. X000F80F0000780780007803C0007801E0007801E0007801F0007801F0007801F0007801F000780
  363. X1E0007801E0007803C00078078000780F00007FF80000781C0000780E0000780F0000780700007
  364. X807800078078000780780007807C0007807C0007807C0007807C0407807E0407803E040FC01E08
  365. XFFFC0F10000003E01E207E9E21>82 D<07E0800C1980100780300380600180600180E00180E000
  366. X80E00080E00080F00000F000007800007F00003FF0001FFC000FFE0003FF00001F800007800003
  367. XC00003C00001C08001C08001C08001C08001C0C00180C00380E00300F00600CE0C0081F8001221
  368. X7D9F19>I<7FFFFFE0780F01E0600F0060400F0020400F0020C00F0030800F0010800F0010800F
  369. X0010800F0010000F0000000F0000000F0000000F0000000F0000000F0000000F0000000F000000
  370. X0F0000000F0000000F0000000F0000000F0000000F0000000F0000000F0000000F0000000F0000
  371. X000F0000001F800007FFFE001C1F7E9E21>I<FFFC3FF80FC007C0078003800780010007800100
  372. X078001000780010007800100078001000780010007800100078001000780010007800100078001
  373. X000780010007800100078001000780010007800100078001000780010007800100078001000380
  374. X02000380020001C0020001C0040000E008000070180000382000000FC0001D207E9E22>I<FFF0
  375. X03FE1F8000F80F0000600F800060078000400780004003C0008003C0008003C0008001E0010001
  376. XE0010001F0010000F0020000F0020000F806000078040000780400003C0800003C0800003C0800
  377. X001E1000001E1000001F3000000F2000000F20000007C0000007C0000007C00000038000000380
  378. X0000038000000100001F207F9E22>I<FFF07FF81FF01F800FC007C00F00078003800F00078001
  379. X000F0007C00100078007C00200078007C00200078007C0020003C009E0040003C009E0040003C0
  380. X09E0040003E010F00C0001E010F0080001E010F0080001F02078080000F02078100000F0207810
  381. X0000F0403C10000078403C20000078403C20000078C03E2000003C801E4000003C801E4000003C
  382. X801E4000001F000F8000001F000F8000001F000F8000001E00078000000E00070000000E000700
  383. X00000C000300000004000200002C207F9E2F>I<7FF83FF80FE00FC007C0070003C0020001E004
  384. X0001F00C0000F0080000781000007C1000003C2000003E4000001E4000000F8000000F80000007
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  921. XFFFF0FFFF01FFE0FF0007E0001F00FF8007F0001E007F8007F0001C007F8003F8003C003FC003F
  922. X80038003FC007FC0038003FE007FC0078001FE00FFC0070001FF00EFE00F0000FF00EFE00E0000
  923. XFF01C7F00E00007F81C7F01C00007F83C7F01C00007FC383F83C00003FC383F83800003FC701FC
  924. X3800001FE701FC7000001FEF01FC7000001FFE00FEF000000FFE00FEE000000FFC007FE0000007
  925. XFC007FC0000007FC007FC0000007F8003FC0000003F8003F80000003F0001F80000001F0001F00
  926. X000001E0000F00000000E0000E000037207E9F3C>119 D<FFFF801FFEFFFF801FFEFFFF801FFE
  927. X07F80003E007F80001C007FC0003C003FC00038003FE00078001FE00070001FF000F0000FF000E
  928. X0000FF801E00007F801C00007FC03C00003FC03800003FE03800001FE07000001FE07000000FF0
  929. XE000000FF0E000000FF9E0000007F9C0000007FFC0000003FF80000003FF80000001FF00000001
  930. XFF00000000FE00000000FE000000007C000000007C000000003800000000380000000070000000
  931. X007000000000F000003C00E000007E01E00000FF01C00000FF03800000FF07800000FF0F000000
  932. X7A3E0000007FFC0000003FF80000000FC0000000272E7E9F2C>121 D E
  933. Xend
  934. X%%EndProlog
  935. X%%BeginSetup
  936. X%%Feature: *Resolution 300
  937. XTeXDict begin 
  938. X%%EndSetup
  939. X%%Page: 1 1
  940. Xbop 101 190 a Fs(Restricting)27 b(Net)n(w)n(ork)e(Access)h(to)i(System)e
  941. X(Daemons)734 281 y(under)h(SunOS)785 407 y Fr(William)14 b(LeF)l(eb)o(vre)778
  942. X511 y Fq(EECS)j(Dep)n(artment)715 567 y(Northwestern)h(University)884
  943. X735 y Fp(Abstract)251 811 y Fo(The)d(implemen)o(tation)d(of)j(most)f(net)o(w)
  944. Xo(ork)h(daemons)f(giv)o(es)h(little)f(consideration)i(to)f(the)g(im-)189
  945. X861 y(plications)h(of)h(w)o(orldwide)f(access.)30 b(In)18 b(some)e(cases,)j
  946. X(suc)o(h)f(access)h(can)f(p)q(ermit)e(the)i(w)o(orldwide)189
  947. X911 y(distribution)12 b(of)g(sensitiv)o(e)h(information,)c(suc)o(h)k(as)g
  948. X(encrypted)h(passw)o(ords.)19 b(In)12 b(other)h(cases,)h(lo)q(cal)189
  949. X960 y(c)o(hanges)k(can)g(b)q(e)g(e\013ected)i(b)o(y)d(pro)q(cesses)k(running)
  950. Xc(an)o(ywhere)h(on)g(the)g(net)o(w)o(ork.)29 b(The)18 b(shared)189
  951. X1010 y(library)c(mec)o(hanism)f(of)i(SunOS)h(can)f(b)q(e)h(used)g(to)f(pro)o
  952. X(vide)g(a)g(\\wrapp)q(er")h(around)f(certain)h(dae-)189 1060
  953. Xy(mons.)22 b(This)16 b(wrapp)q(er)g(tak)o(es)g(the)h(form)d(of)h(an)g
  954. X(alternate)i Fn(libc)d Fo(shared)j(library)m(.)22 b(Rather)16
  955. Xb(than)189 1110 y(linking)e(against)h(the)i(standard)f Fn(libc)p
  956. XFo(,)f(a)h(daemon)e(is)i(directed)h(to)f(link)f(against)g(this)h(alternate)
  957. X189 1160 y Fm(se)n(cur)n(e)10 b Fo(library)m(.)16 b(The)11
  958. Xb(secure)i(library)d(has)h(an)f(augmen)o(ted)g(form)f(of)h(certain)h(net)o(w)
  959. Xo(ork-related)h(sys-)189 1210 y(tem)f(calls)h(whic)o(h)g(\014rst)h(p)q
  960. X(erform)f(the)h(true)g(system)f(call)g(then)h(c)o(hec)o(k)g(the)g(so)q(c)o(k)
  961. END_OF_FILE
  962.   if test 46421 -ne `wc -c <'securelib.ps.B'`; then
  963.     echo shar: \"'securelib.ps.B'\" unpacked with wrong size!
  964.   elif test -f 'securelib.ps.A' && test -f 'securelib.ps.C'; then
  965.     echo shar: Combining  \"'securelib.ps'\" \(131349 characters\)
  966.     cat 'securelib.ps.A' 'securelib.ps.B' 'securelib.ps.C' > 'securelib.ps'
  967.     if test 131349 -ne `wc -c <'securelib.ps'`; then
  968.       echo shar: \"'securelib.ps'\" combined with wrong size!
  969.     else
  970.       rm securelib.ps.A securelib.ps.B securelib.ps.C
  971.     fi
  972.   fi
  973.   # end of 'securelib.ps.B'
  974. fi
  975. if test -f 'start.X' -a "${1}" != "-c" ; then 
  976.   echo shar: Will not clobber existing file \"'start.X'\"
  977. else
  978.   echo shar: Extracting \"'start.X'\" \(183 characters\)
  979.   sed "s/^X//" >'start.X' <<'END_OF_FILE'
  980. X#!/bin/sh
  981. X#
  982. X# Start a daemon with the secure library.
  983. X#
  984. X# Usage: %DESTDIR%/start program args
  985. X#
  986. XSL_NAME=`basename $1`
  987. XLD_LIBRARY_PATH=%DESTDIR%
  988. Xexport LD_LIBRARY_PATH SL_NAME
  989. Xexec $@
  990. END_OF_FILE
  991.   if test 183 -ne `wc -c <'start.X'`; then
  992.     echo shar: \"'start.X'\" unpacked with wrong size!
  993.   fi
  994.   # end of 'start.X'
  995. fi
  996. echo shar: End of archive 2 \(of 3\).
  997. cp /dev/null ark2isdone
  998. MISSING=""
  999. for I in 1 2 3 ; do
  1000.     if test ! -f ark${I}isdone ; then
  1001.     MISSING="${MISSING} ${I}"
  1002.     fi
  1003. done
  1004. if test "${MISSING}" = "" ; then
  1005.     echo You have unpacked all 3 archives.
  1006.     rm -f ark[1-9]isdone
  1007. else
  1008.     echo You still must unpack the following archives:
  1009.     echo "        " ${MISSING}
  1010. fi
  1011. exit 0
  1012. exit 0 # Just in case...
  1013.