diff options
Diffstat (limited to 'contrib/libpam/modules/pam_group/pam_group.c')
-rw-r--r-- | contrib/libpam/modules/pam_group/pam_group.c | 862 |
1 files changed, 0 insertions, 862 deletions
diff --git a/contrib/libpam/modules/pam_group/pam_group.c b/contrib/libpam/modules/pam_group/pam_group.c deleted file mode 100644 index 9e2cf88..0000000 --- a/contrib/libpam/modules/pam_group/pam_group.c +++ /dev/null @@ -1,862 +0,0 @@ -/* pam_group module */ - -/* - * $Id: pam_group.c,v 1.7 1997/02/15 17:31:48 morgan Exp morgan $ - * - * Written by Andrew Morgan <morgan@parc.power.net> 1996/7/6 - * - * $Log: pam_group.c,v $ - * Revision 1.7 1997/02/15 17:31:48 morgan - * time parsing more robust - * - * Revision 1.6 1997/01/04 21:57:49 morgan - * fixed warning about setgroups not being defined - * - * Revision 1.5 1997/01/04 20:26:49 morgan - * can be compiled with and without libpwdb. fixed buffer underwriting - * pays attention to PAM_CRED flags(!) - * - * Revision 1.4 1996/12/01 02:54:37 morgan - * mostly debugging now uses D(()) - * - * Revision 1.3 1996/11/10 21:01:22 morgan - * compatability and pam_get_user changes - */ - -const static char rcsid[] = -"$Id: pam_group.c,v 1.7 1997/02/15 17:31:48 morgan Exp morgan $;\n" -"Version 0.5 for Linux-PAM\n" -"Copyright (c) Andrew G. Morgan 1996 <morgan@parc.power.net>\n"; - -#include <sys/file.h> -#include <stdio.h> -#include <stdlib.h> -#include <ctype.h> -#include <unistd.h> -#include <stdarg.h> -#include <time.h> -#include <syslog.h> -#include <string.h> - -#define __USE_BSD -#include <grp.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <fcntl.h> - -#ifdef WANT_PWDB -#include <pwdb/pwdb_public.h> -#endif - -#define PAM_GROUP_CONF CONFILE /* from external define */ -#define PAM_GROUP_BUFLEN 1000 -#define FIELD_SEPARATOR ';' /* this is new as of .02 */ - -typedef enum { FALSE, TRUE } boolean; -typedef enum { AND, OR } operator; - -/* - * here, we make definitions for the externally accessible functions - * in this file (these definitions are required for static modules - * but strongly encouraged generally) they are used to instruct the - * modules include file to define their prototypes. - */ - -#define PAM_SM_AUTH - -#include <security/pam_modules.h> -#include <security/_pam_macros.h> - -/* --- static functions for checking whether the user should be let in --- */ - -static void _log_err(const char *format, ... ) -{ - va_list args; - - va_start(args, format); - openlog("pam_group", LOG_CONS|LOG_PID, LOG_AUTH); - vsyslog(LOG_CRIT, format, args); - va_end(args); - closelog(); -} - -static void shift_bytes(char *mem, int from, int by) -{ - while (by-- > 0) { - *mem = mem[from]; - ++mem; - } -} - -static int read_field(int fd, char **buf, int *from, int *to) -{ - /* is buf set ? */ - - if (! *buf) { - *buf = (char *) malloc(PAM_GROUP_BUFLEN); - if (! *buf) { - _log_err("out of memory"); - return -1; - } - *from = *to = 0; - fd = open(PAM_GROUP_CONF, O_RDONLY); - } - - /* do we have a file open ? return error */ - - if (fd < 0 && *to <= 0) { - _log_err( PAM_GROUP_CONF " not opened"); - memset(*buf, 0, PAM_GROUP_BUFLEN); - _pam_drop(*buf); - return -1; - } - - /* check if there was a newline last time */ - - if ((*to > *from) && (*to > 0) - && ((*buf)[*from] == '\0')) { /* previous line ended */ - (*from)++; - (*buf)[0] = '\0'; - return fd; - } - - /* ready for more data: first shift the buffer's remaining data */ - - *to -= *from; - shift_bytes(*buf, *from, *to); - *from = 0; - (*buf)[*to] = '\0'; - - while (fd >= 0 && *to < PAM_GROUP_BUFLEN) { - int i; - - /* now try to fill the remainder of the buffer */ - - i = read(fd, *to + *buf, PAM_GROUP_BUFLEN - *to); - if (i < 0) { - _log_err("error reading " PAM_GROUP_CONF); - return -1; - } else if (!i) { - fd = -1; /* end of file reached */ - } else - *to += i; - - /* - * contract the buffer. Delete any comments, and replace all - * multiple spaces with single commas - */ - - i = 0; -#ifdef DEBUG_DUMP - D(("buffer=<%s>",*buf)); -#endif - while (i < *to) { - if ((*buf)[i] == ',') { - int j; - - for (j=++i; j<*to && (*buf)[j] == ','; ++j); - if (j!=i) { - shift_bytes(i + (*buf), j-i, (*to) - j); - *to -= j-i; - } - } - switch ((*buf)[i]) { - int j,c; - case '#': - for (j=i; j < *to && (c = (*buf)[j]) != '\n'; ++j); - if (j >= *to) { - (*buf)[*to = ++i] = '\0'; - } else if (c == '\n') { - shift_bytes(i + (*buf), j-i, (*to) - j); - *to -= j-i; - ++i; - } else { - _log_err("internal error in " __FILE__ - " at line %d", __LINE__ ); - return -1; - } - break; - case '\\': - if ((*buf)[i+1] == '\n') { - shift_bytes(i + *buf, 2, *to - (i+2)); - *to -= 2; - } - break; - case '!': - case ' ': - case '\t': - if ((*buf)[i] != '!') - (*buf)[i] = ','; - /* delete any trailing spaces */ - for (j=++i; j < *to && ( (c = (*buf)[j]) == ' ' - || c == '\t' ); ++j); - shift_bytes(i + *buf, j-i, (*to)-j ); - *to -= j-i; - break; - default: - ++i; - } - } - } - - (*buf)[*to] = '\0'; - - /* now return the next field (set the from/to markers) */ - { - int i; - - for (i=0; i<*to; ++i) { - switch ((*buf)[i]) { - case '#': - case '\n': /* end of the line/file */ - (*buf)[i] = '\0'; - *from = i; - return fd; - case FIELD_SEPARATOR: /* end of the field */ - (*buf)[i] = '\0'; - *from = ++i; - return fd; - } - } - *from = i; - (*buf)[*from] = '\0'; - } - - if (*to <= 0) { - D(("[end of text]")); - *buf = NULL; - } - return fd; -} - -/* read a member from a field */ - -static int logic_member(const char *string, int *at) -{ - int len,c,to; - int done=0; - int token=0; - - len=0; - to=*at; - do { - c = string[to++]; - - switch (c) { - - case '\0': - --to; - done = 1; - break; - - case '&': - case '|': - case '!': - if (token) { - --to; - } - done = 1; - break; - - default: - if (isalpha(c) || c == '*' || isdigit(c) || c == '_' - || c == '-' || c == '.') { - token = 1; - } else if (token) { - --to; - done = 1; - } else { - ++*at; - } - } - } while (!done); - - return to - *at; -} - -typedef enum { VAL, OP } expect; - -static boolean logic_field(const void *me, const char *x, int rule, - boolean (*agrees)(const void *, const char * - , int, int)) -{ - boolean left=FALSE, right, not=FALSE; - operator oper=OR; - int at=0, l; - expect next=VAL; - - while ((l = logic_member(x,&at))) { - int c = x[at]; - - if (next == VAL) { - if (c == '!') - not = !not; - else if (isalpha(c) || c == '*') { - right = not ^ agrees(me, x+at, l, rule); - if (oper == AND) - left &= right; - else - left |= right; - next = OP; - } else { - _log_err("garbled syntax; expected name (rule #%d)", rule); - return FALSE; - } - } else { /* OP */ - switch (c) { - case '&': - oper = AND; - break; - case '|': - oper = OR; - break; - default: - _log_err("garbled syntax; expected & or | (rule #%d)" - , rule); - D(("%c at %d",c,at)); - return FALSE; - } - next = VAL; - } - at += l; - } - - return left; -} - -static boolean is_same(const void *A, const char *b, int len, int rule) -{ - int i; - const char *a; - - a = A; - for (i=0; len > 0; ++i, --len) { - if (b[i] != a[i]) { - if (b[i++] == '*') { - return (!--len || !strncmp(b+i,a+strlen(a)-len,len)); - } else - return FALSE; - } - } - return ( !len ); -} - -typedef struct { - int day; /* array of 7 bits, one set for today */ - int minute; /* integer, hour*100+minute for now */ -} TIME; - -struct day { - const char *d; - int bit; -} static const days[11] = { - { "su", 01 }, - { "mo", 02 }, - { "tu", 04 }, - { "we", 010 }, - { "th", 020 }, - { "fr", 040 }, - { "sa", 0100 }, - { "wk", 076 }, - { "wd", 0101 }, - { "al", 0177 }, - { NULL, 0 } -}; - -static TIME time_now(void) -{ - struct tm *local; - time_t the_time; - TIME this; - - the_time = time((time_t *)0); /* get the current time */ - local = localtime(&the_time); - this.day = days[local->tm_wday].bit; - this.minute = local->tm_hour*100 + local->tm_min; - - D(("day: 0%o, time: %.4d", this.day, this.minute)); - return this; -} - -/* take the current date and see if the range "date" passes it */ -static boolean check_time(const void *AT, const char *times, int len, int rule) -{ - boolean not,pass; - int marked_day, time_start, time_end; - const TIME *at; - int i,j=0; - - at = AT; - D(("checking: 0%o/%.4d vs. %s", at->day, at->minute, times)); - - if (times == NULL) { - /* this should not happen */ - _log_err("internal error: " __FILE__ " line %d", __LINE__); - return FALSE; - } - - if (times[j] == '!') { - ++j; - not = TRUE; - } else { - not = FALSE; - } - - for (marked_day = 0; len > 0 && isalpha(times[j]); --len) { - int this_day=-1; - - D(("%c%c ?", times[j], times[j+1])); - for (i=0; days[i].d != NULL; ++i) { - if (tolower(times[j]) == days[i].d[0] - && tolower(times[j+1]) == days[i].d[1] ) { - this_day = days[i].bit; - break; - } - } - j += 2; - if (this_day == -1) { - _log_err("bad day specified (rule #%d)", rule); - return FALSE; - } - marked_day ^= this_day; - } - if (marked_day == 0) { - _log_err("no day specified"); - return FALSE; - } - D(("day range = 0%o", marked_day)); - - time_start = 0; - for (i=0; len > 0 && i < 4 && isdigit(times[i+j]); ++i, --len) { - time_start *= 10; - time_start += times[i+j]-'0'; /* is this portable? */ - } - j += i; - - if (times[j] == '-') { - time_end = 0; - for (i=1; len > 0 && i < 5 && isdigit(times[i+j]); ++i, --len) { - time_end *= 10; - time_end += times[i+j]-'0'; /* is this portable? */ - } - j += i; - } else - time_end = -1; - - D(("i=%d, time_end=%d, times[j]='%c'", i, time_end, times[j])); - if (i != 5 || time_end == -1) { - _log_err("no/bad times specified (rule #%d)", rule); - return TRUE; - } - D(("times(%d to %d)", time_start,time_end)); - D(("marked_day = 0%o", marked_day)); - - /* compare with the actual time now */ - - pass = FALSE; - if (time_start < time_end) { /* start < end ? --> same day */ - if ((at->day & marked_day) && (at->minute >= time_start) - && (at->minute < time_end)) { - D(("time is listed")); - pass = TRUE; - } - } else { /* spans two days */ - if ((at->day & marked_day) && (at->minute >= time_start)) { - D(("caught on first day")); - pass = TRUE; - } else { - marked_day <<= 1; - marked_day |= (marked_day & 0200) ? 1:0; - D(("next day = 0%o", marked_day)); - if ((at->day & marked_day) && (at->minute <= time_end)) { - D(("caught on second day")); - pass = TRUE; - } - } - } - - return (not ^ pass); -} - -static int find_member(const char *string, int *at) -{ - int len,c,to; - int done=0; - int token=0; - - len=0; - to=*at; - do { - c = string[to++]; - - switch (c) { - - case '\0': - --to; - done = 1; - break; - - case '&': - case '|': - case '!': - if (token) { - --to; - } - done = 1; - break; - - default: - if (isalpha(c) || isdigit(c) || c == '_' || c == '*' - || c == '-') { - token = 1; - } else if (token) { - --to; - done = 1; - } else { - ++*at; - } - } - } while (!done); - - return to - *at; -} - -#define GROUP_BLK 10 -#define blk_size(len) (((len-1 + GROUP_BLK)/GROUP_BLK)*GROUP_BLK) - -static int mkgrplist(char *buf, gid_t **list, int len) -{ - int l,at=0; - int blks; - - blks = blk_size(len); - D(("cf. blks=%d and len=%d", blks,len)); - - while ((l = find_member(buf,&at))) { - int edge; - - if (len >= blks) { - gid_t *tmp; - - D(("allocating new block")); - tmp = (gid_t *) realloc((*list) - , sizeof(gid_t) * (blks += GROUP_BLK)); - if (tmp != NULL) { - (*list) = tmp; - } else { - _log_err("out of memory for group list"); - free(*list); - (*list) = NULL; - return -1; - } - } - - /* '\0' terminate the entry */ - - edge = (buf[at+l]) ? 1:0; - buf[at+l] = '\0'; - D(("found group: %s",buf+at)); - - /* this is where we convert a group name to a gid_t */ -#ifdef WANT_PWDB - { - int retval; - const struct pwdb *pw=NULL; - - retval = pwdb_locate("group", PWDB_DEFAULT, buf+at - , PWDB_ID_UNKNOWN, &pw); - if (retval != PWDB_SUCCESS) { - _log_err("bad group: %s; %s", buf+at, pwdb_strerror(retval)); - } else { - const struct pwdb_entry *pwe=NULL; - - D(("group %s exists", buf+at)); - retval = pwdb_get_entry(pw, "gid", &pwe); - if (retval == PWDB_SUCCESS) { - D(("gid = %d [%p]",* (const gid_t *) pwe->value,list)); - (*list)[len++] = * (const gid_t *) pwe->value; - pwdb_entry_delete(&pwe); /* tidy up */ - } else { - _log_err("%s group entry is bad; %s" - , pwdb_strerror(retval)); - } - pw = NULL; /* break link - cached for later use */ - } - } -#else - { - const struct group *grp; - - grp = getgrnam(buf+at); - if (grp == NULL) { - _log_err("bad group: %s", buf+at); - } else { - D(("group %s exists", buf+at)); - (*list)[len++] = grp->gr_gid; - } - } -#endif - - /* next entry along */ - - at += l + edge; - } - D(("returning with [%p/len=%d]->%p",list,len,*list)); - return len; -} - - -static int check_account(const char *service, const char *tty - , const char *user) -{ - int from=0,to=0,fd=-1; - char *buffer=NULL; - int count=0; - TIME here_and_now; - int retval=PAM_SUCCESS; - gid_t *grps; - int no_grps; - - /* - * first we get the current list of groups - the application - * will have previously done an initgroups(), or equivalent. - */ - - D(("counting supplementary groups")); - no_grps = getgroups(0, NULL); /* find the current number of groups */ - if (no_grps > 0) { - grps = calloc( blk_size(no_grps) , sizeof(gid_t) ); - D(("copying current list into grps [%d big]",blk_size(no_grps))); - (void) getgroups(no_grps, grps); -#ifdef DEBUG - { - int z; - for (z=0; z<no_grps; ++z) { - D(("gid[%d]=%d", z, grps[z])); - } - } -#endif - } else { - D(("no supplementary groups known")); - no_grps = 0; - grps = NULL; - } - - here_and_now = time_now(); /* find current time */ - - /* parse the rules in the configuration file */ - do { - int good=TRUE; - - /* here we get the service name field */ - - fd = read_field(fd,&buffer,&from,&to); - if (!buffer || !buffer[0]) { - /* empty line .. ? */ - continue; - } - ++count; - D(("working on rule #%d",count)); - - good = logic_field(service, buffer, count, is_same); - D(("with service: %s", good ? "passes":"fails" )); - - /* here we get the terminal name field */ - - fd = read_field(fd,&buffer,&from,&to); - if (!buffer || !buffer[0]) { - _log_err(PAM_GROUP_CONF "; no tty entry #%d", count); - continue; - } - good &= logic_field(tty, buffer, count, is_same); - D(("with tty: %s", good ? "passes":"fails" )); - - /* here we get the username field */ - - fd = read_field(fd,&buffer,&from,&to); - if (!buffer || !buffer[0]) { - _log_err(PAM_GROUP_CONF "; no user entry #%d", count); - continue; - } - good &= logic_field(user, buffer, count, is_same); - D(("with user: %s", good ? "passes":"fails" )); - - /* here we get the time field */ - - fd = read_field(fd,&buffer,&from,&to); - if (!buffer || !buffer[0]) { - _log_err(PAM_GROUP_CONF "; no time entry #%d", count); - continue; - } - - good &= logic_field(&here_and_now, buffer, count, check_time); - D(("with time: %s", good ? "passes":"fails" )); - - fd = read_field(fd,&buffer,&from,&to); - if (!buffer || !buffer[0]) { - _log_err(PAM_GROUP_CONF "; no listed groups for rule #%d" - , count); - continue; - } - - /* - * so we have a list of groups, we need to turn it into - * something to send to setgroups(2) - */ - - if (good) { - D(("adding %s to gid list", buffer)); - good = mkgrplist(buffer, &grps, no_grps); - if (good < 0) { - no_grps = 0; - } else { - no_grps = good; - } - } - - /* check the line is terminated correctly */ - - fd = read_field(fd,&buffer,&from,&to); - if (buffer && buffer[0]) { - _log_err(PAM_GROUP_CONF "; poorly terminated rule #%d", count); - } - - if (good > 0) { - D(("rule #%d passed, added %d groups", count, good)); - } else if (good < 0) { - retval = PAM_BUF_ERR; - } else { - D(("rule #%d failed", count)); - } - - } while (buffer); - - /* now set the groups for the user */ - - if (no_grps > 0) { - int err; - D(("trying to set %d groups", no_grps)); -#ifdef DEBUG - for (err=0; err<no_grps; ++err) { - D(("gid[%d]=%d", err, grps[err])); - } -#endif - if ((err = setgroups(no_grps, grps))) { - D(("but couldn't set groups %d", err)); - _log_err("unable to set the group membership for user (err=%d)" - , err); - retval = PAM_CRED_ERR; - } - } - - if (grps) { /* tidy up */ - memset(grps, 0, sizeof(gid_t) * blk_size(no_grps)); - _pam_drop(grps); - no_grps = 0; - } - - return retval; -} - -/* --- public authentication management functions --- */ - -PAM_EXTERN int pam_sm_authenticate(pam_handle_t *pamh, int flags - , int argc, const char **argv) -{ - return PAM_IGNORE; -} - -PAM_EXTERN int pam_sm_setcred(pam_handle_t *pamh, int flags - , int argc, const char **argv) -{ - const char *service=NULL, *tty=NULL; - const char *user=NULL; - int retval; - unsigned setting; - - /* only interested in establishing credentials */ - - setting = flags; - if (!(setting & PAM_ESTABLISH_CRED)) { - D(("ignoring call - not for establishing credentials")); - return PAM_SUCCESS; /* don't fail because of this */ - } - - /* set service name */ - - if (pam_get_item(pamh, PAM_SERVICE, (const void **)&service) - != PAM_SUCCESS || service == NULL) { - _log_err("cannot find the current service name"); - return PAM_ABORT; - } - - /* set username */ - - if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL - || *user == '\0') { - _log_err("cannot determine the user's name"); - return PAM_USER_UNKNOWN; - } - - /* set tty name */ - - if (pam_get_item(pamh, PAM_TTY, (const void **)&tty) != PAM_SUCCESS - || tty == NULL) { - D(("PAM_TTY not set, probing stdin")); - tty = ttyname(STDIN_FILENO); - if (tty == NULL) { - _log_err("couldn't get the tty name"); - return PAM_ABORT; - } - if (pam_set_item(pamh, PAM_TTY, tty) != PAM_SUCCESS) { - _log_err("couldn't set tty name"); - return PAM_ABORT; - } - } - - if (strncmp("/dev/",tty,5) == 0) { /* strip leading /dev/ */ - tty += 5; - } - - /* good, now we have the service name, the user and the terminal name */ - - D(("service=%s", service)); - D(("user=%s", user)); - D(("tty=%s", tty)); - -#ifdef WANT_PWDB - - /* We initialize the pwdb library and check the account */ - retval = pwdb_start(); /* initialize */ - if (retval == PWDB_SUCCESS) { - retval = check_account(service,tty,user); /* get groups */ - (void) pwdb_end(); /* tidy up */ - } else { - D(("failed to initialize pwdb; %s", pwdb_strerror(retval))); - _log_err("unable to initialize libpwdb"); - retval = PAM_ABORT; - } - -#else /* WANT_PWDB */ - retval = check_account(service,tty,user); /* get groups */ -#endif /* WANT_PWDB */ - - return retval; -} - -/* end of module definition */ - -#ifdef PAM_STATIC - -/* static module data */ - -struct pam_module _pam_group_modstruct = { - "pam_group", - pam_sm_authenticate, - pam_sm_setcred, - NULL, - NULL, - NULL, - NULL -}; -#endif |