From 9ada0093e92388590c7368600ca4e9e3e376f0d0 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 16:22:51 +0200
Subject: Adding upstream version 1.5.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 modules/pam_group/pam_group.c | 815 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 815 insertions(+)
 create mode 100644 modules/pam_group/pam_group.c

(limited to 'modules/pam_group/pam_group.c')

diff --git a/modules/pam_group/pam_group.c b/modules/pam_group/pam_group.c
new file mode 100644
index 0000000..d9a35ea
--- /dev/null
+++ b/modules/pam_group/pam_group.c
@@ -0,0 +1,815 @@
+/*
+ * pam_group module
+ *
+ * Written by Andrew Morgan <morgan@linux.kernel.org> 1996/7/6
+ * Field parsing rewritten by Tomas Mraz <tm@t8m.info>
+ */
+
+#include "config.h"
+
+#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>
+
+#include <grp.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <netdb.h>
+
+#define PAM_GROUP_BUFLEN        1000
+#define FIELD_SEPARATOR         ';'   /* this is new as of .02 */
+
+#ifndef TRUE
+# define TRUE 1
+#endif
+#ifndef FALSE
+# define FALSE 0
+#endif
+
+typedef enum { AND, OR } operator;
+
+#include <security/pam_modules.h>
+#include <security/_pam_macros.h>
+#include <security/pam_modutil.h>
+#include <security/pam_ext.h>
+
+/* --- static functions for checking whether the user should be let in --- */
+
+static char *
+shift_buf(char *mem, int from)
+{
+    char *start = mem;
+    while ((*mem = mem[from]) != '\0')
+	++mem;
+    memset(mem, '\0', PAM_GROUP_BUFLEN - (mem - start));
+    return mem;
+}
+
+static void
+trim_spaces(char *buf, char *from)
+{
+    while (from > buf) {
+	--from;
+	if (*from == ' ')
+	    *from = '\0';
+	else
+	    break;
+    }
+}
+
+#define STATE_NL       0 /* new line starting */
+#define STATE_COMMENT  1 /* inside comment */
+#define STATE_FIELD    2 /* field following */
+#define STATE_EOF      3 /* end of file or error */
+
+static int
+read_field(const pam_handle_t *pamh, int fd, char **buf, int *from, int *state)
+{
+    char *to;
+    char *src;
+    int i;
+    char c;
+    int onspace;
+
+    /* is buf set ? */
+    if (! *buf) {
+	*buf = (char *) calloc(1, PAM_GROUP_BUFLEN+1);
+	if (! *buf) {
+	    pam_syslog(pamh, LOG_CRIT, "out of memory");
+	    D(("no memory"));
+	    *state = STATE_EOF;
+	    return -1;
+	}
+	*from = 0;
+        *state = STATE_NL;
+	fd = open(PAM_GROUP_CONF, O_RDONLY);
+	if (fd < 0) {
+	    pam_syslog(pamh, LOG_ERR, "error opening %s: %m", PAM_GROUP_CONF);
+	    _pam_drop(*buf);
+	    *state = STATE_EOF;
+	    return -1;
+	}
+    }
+
+    if (*from > 0)
+	to = shift_buf(*buf, *from);
+    else
+	to = *buf;
+
+    while (fd != -1 && to - *buf < PAM_GROUP_BUFLEN) {
+	i = pam_modutil_read(fd, to, PAM_GROUP_BUFLEN - (to - *buf));
+	if (i < 0) {
+	    pam_syslog(pamh, LOG_ERR, "error reading %s: %m", PAM_GROUP_CONF);
+	    close(fd);
+	    memset(*buf, 0, PAM_GROUP_BUFLEN);
+	    _pam_drop(*buf);
+	    *state = STATE_EOF;
+	    return -1;
+	} else if (!i) {
+	    close(fd);
+	    fd = -1;          /* end of file reached */
+	}
+
+	to += i;
+    }
+
+    if (to == *buf) {
+	/* nothing previously in buf, nothing read */
+	_pam_drop(*buf);
+	*state = STATE_EOF;
+	return -1;
+    }
+
+    memset(to, '\0', PAM_GROUP_BUFLEN - (to - *buf));
+
+    to = *buf;
+    onspace = 1; /* delete any leading spaces */
+
+    for (src = to; (c=*src) != '\0'; ++src) {
+	if (*state == STATE_COMMENT && c != '\n') {
+		continue;
+	}
+
+	switch (c) {
+	    case '\n':
+		*state = STATE_NL;
+                *to = '\0';
+		*from = (src - *buf) + 1;
+		trim_spaces(*buf, to);
+		return fd;
+
+	    case '\t':
+            case ' ':
+		if (!onspace) {
+		    onspace = 1;
+		    *to++ = ' ';
+		}
+		break;
+
+            case '!':
+		onspace = 1; /* ignore following spaces */
+		*to++ = '!';
+		break;
+
+	    case '#':
+		*state = STATE_COMMENT;
+		break;
+
+	    case FIELD_SEPARATOR:
+		*state = STATE_FIELD;
+                *to = '\0';
+		*from = (src - *buf) + 1;
+		trim_spaces(*buf, to);
+		return fd;
+
+	    case '\\':
+		if (src[1] == '\n') {
+		    ++src; /* skip it */
+		    break;
+		}
+	    /* fallthrough */
+	    default:
+		*to++ = c;
+		onspace = 0;
+	}
+	if (src > to)
+	    *src = '\0'; /* clearing */
+    }
+
+    if (*state != STATE_COMMENT) {
+	*state = STATE_COMMENT;
+	pam_syslog(pamh, LOG_ERR, "field too long - ignored");
+	**buf = '\0';
+    } else {
+	*to = '\0';
+	trim_spaces(*buf, to);
+    }
+
+    *from = 0;
+    return fd;
+}
+
+/* read a member from a field */
+
+static int logic_member(const char *string, int *at)
+{
+     int c,to;
+     int done=0;
+     int token=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 == '.' || c == '/' || c == ':') {
+		    token = 1;
+	       } else if (token) {
+		    --to;
+		    done = 1;
+	       } else {
+		    ++*at;
+	       }
+	  }
+     } while (!done);
+
+     return to - *at;
+}
+
+typedef enum { VAL, OP } expect;
+
+static int
+logic_field (const pam_handle_t *pamh, const void *me,
+             const char *x, int rule,
+             int (*agrees)(const pam_handle_t *pamh, const void *,
+                               const char *, int, int))
+{
+     int 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 == '*' || isdigit(c) || c == '_'
+                    || c == '-' || c == '.' || c == '/' || c == ':') {
+		    right = not ^ agrees(pamh, me, x+at, l, rule);
+		    if (oper == AND)
+			 left &= right;
+		    else
+			 left |= right;
+		    next = OP;
+	       } else {
+		    pam_syslog(pamh, LOG_ERR,
+			       "garbled syntax; expected name (rule #%d)",
+			       rule);
+		    return FALSE;
+	       }
+	  } else {   /* OP */
+	       switch (c) {
+	       case '&':
+		    oper = AND;
+		    break;
+	       case '|':
+		    oper = OR;
+		    break;
+	       default:
+		    pam_syslog(pamh, LOG_ERR,
+			       "garbled syntax; expected & or | (rule #%d)",
+			       rule);
+		    D(("%c at %d",c,at));
+		    return FALSE;
+	       }
+	       next = VAL;
+	       not = FALSE;
+	  }
+	  at += l;
+     }
+
+     return left;
+}
+
+static int
+is_same (const pam_handle_t *pamh UNUSED,
+         const void *A, const char *b, int len, int rule UNUSED)
+{
+     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;
+	  }
+     }
+
+     /* Ok, we know that b is a substring from A and does not contain
+        wildcards, but now the length of both strings must be the same,
+        too. In this case it means, a[i] has to be the end of the string. */
+     if (a[i] != '\0')
+          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;
+
+static struct day {
+     const char *d;
+     int bit;
+} 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 int
+check_time (const pam_handle_t *pamh, const void *AT,
+            const char *times, int len, int rule)
+{
+     int 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 */
+	  pam_syslog(pamh, LOG_CRIT, "internal error in file %s at line %d",
+		     __FILE__, __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) {
+	       pam_syslog(pamh, LOG_ERR, "bad day specified (rule #%d)", rule);
+	       return FALSE;
+	  }
+	  marked_day ^= this_day;
+     }
+     if (marked_day == 0) {
+	  pam_syslog(pamh, 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) {
+	  pam_syslog(pamh, 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 c,to;
+     int done=0;
+     int token=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(pam_handle_t *pamh, 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 {
+		    pam_syslog(pamh, 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 */
+	  {
+	      const struct group *grp;
+
+	      grp = pam_modutil_getgrnam(pamh, buf+at);
+	      if (grp == NULL) {
+		  pam_syslog(pamh, LOG_ERR, "bad group: %s", buf+at);
+	      } else {
+		  D(("group %s exists", buf+at));
+		  (*list)[len++] = grp->gr_gid;
+	      }
+	  }
+
+	  /* next entry along */
+
+	  at += l + edge;
+     }
+     D(("returning with [%p/len=%d]->%p",list,len,*list));
+     return len;
+}
+
+
+static int check_account(pam_handle_t *pamh, const char *service,
+			 const char *tty, const char *user)
+{
+    int from=0, state=STATE_NL, 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)));
+	if (getgroups(no_grps, grps) < 0) {
+	    D(("getgroups call failed"));
+	    no_grps = 0;
+	    _pam_drop(grps);
+	}
+#ifdef PAM_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(pamh, fd, &buffer, &from, &state);
+	if (!buffer || !buffer[0]) {
+	    /* empty line .. ? */
+	    continue;
+	}
+	++count;
+	D(("working on rule #%d",count));
+
+	if (state != STATE_FIELD) {
+	    pam_syslog(pamh, LOG_ERR,
+		       "%s: malformed rule #%d", PAM_GROUP_CONF, count);
+	    continue;
+	}
+
+	good = logic_field(pamh,service, buffer, count, is_same);
+	D(("with service: %s", good ? "passes":"fails" ));
+
+	/* here we get the terminal name field */
+
+	fd = read_field(pamh, fd, &buffer, &from, &state);
+	if (state != STATE_FIELD) {
+	    pam_syslog(pamh, LOG_ERR,
+		       "%s: malformed rule #%d", PAM_GROUP_CONF, count);
+	    continue;
+	}
+	good &= logic_field(pamh,tty, buffer, count, is_same);
+	D(("with tty: %s", good ? "passes":"fails" ));
+
+	/* here we get the username field */
+
+	fd = read_field(pamh, fd, &buffer, &from, &state);
+	if (state != STATE_FIELD) {
+	    pam_syslog(pamh, LOG_ERR,
+		       "%s: malformed rule #%d", PAM_GROUP_CONF, count);
+	    continue;
+	}
+	/* If buffer starts with @, we are using netgroups */
+	if (buffer[0] == '@')
+#ifdef HAVE_INNETGR
+	  good &= innetgr (&buffer[1], NULL, user, NULL);
+#else
+	  pam_syslog (pamh, LOG_ERR, "pam_group does not have netgroup support");
+#endif
+	/* otherwise, if the buffer starts with %, it's a UNIX group */
+	else if (buffer[0] == '%')
+          good &= pam_modutil_user_in_group_nam_nam(pamh, user, &buffer[1]);
+	else
+	  good &= logic_field(pamh,user, buffer, count, is_same);
+	D(("with user: %s", good ? "passes":"fails" ));
+
+	/* here we get the time field */
+
+	fd = read_field(pamh, fd, &buffer, &from, &state);
+	if (state != STATE_FIELD) {
+	    pam_syslog(pamh, LOG_ERR,
+		       "%s: malformed rule #%d", PAM_GROUP_CONF, count);
+	    continue;
+	}
+
+	good &= logic_field(pamh,&here_and_now, buffer, count, check_time);
+	D(("with time: %s", good ? "passes":"fails" ));
+
+	fd = read_field(pamh, fd, &buffer, &from, &state);
+	if (state == STATE_FIELD) {
+	    pam_syslog(pamh, LOG_ERR,
+		       "%s: poorly terminated rule #%d", PAM_GROUP_CONF, 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(pamh, buffer, &grps, no_grps);
+	    if (good < 0) {
+		no_grps = 0;
+	    } else {
+		no_grps = good;
+	    }
+	}
+
+	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 (state != STATE_EOF);
+
+    /* now set the groups for the user */
+
+    if (no_grps > 0) {
+#ifdef PAM_DEBUG
+	int err;
+#endif
+	D(("trying to set %d groups", no_grps));
+#ifdef PAM_DEBUG
+	for (err=0; err<no_grps; ++err) {
+	    D(("gid[%d]=%d", err, grps[err]));
+	}
+#endif
+	if (setgroups(no_grps, grps) != 0) {
+	    D(("but couldn't set groups %m"));
+	    pam_syslog(pamh, LOG_ERR,
+		       "unable to set the group membership for user: %m");
+	    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 --- */
+
+int
+pam_sm_authenticate (pam_handle_t *pamh UNUSED, int flags UNUSED,
+		     int argc UNUSED, const char **argv UNUSED)
+{
+    return PAM_IGNORE;
+}
+
+int
+pam_sm_setcred (pam_handle_t *pamh, int flags,
+		int argc UNUSED, const char **argv UNUSED)
+{
+    const void *service=NULL, *void_tty=NULL;
+    const char *user=NULL;
+    const char *tty;
+    int retval;
+    unsigned setting;
+
+    /* only interested in establishing credentials */
+
+    setting = flags;
+    if (!(setting & (PAM_ESTABLISH_CRED | PAM_REINITIALIZE_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, &service)
+	!= PAM_SUCCESS || service == NULL) {
+	pam_syslog(pamh, LOG_ERR, "cannot find the current service name");
+	return PAM_ABORT;
+    }
+
+    /* set username */
+
+    if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || *user == '\0') {
+	pam_syslog(pamh, LOG_NOTICE, "cannot determine user name");
+	return PAM_USER_UNKNOWN;
+    }
+
+    /* set tty name */
+
+    if (pam_get_item(pamh, PAM_TTY, &void_tty) != PAM_SUCCESS
+	|| void_tty == NULL) {
+	D(("PAM_TTY not set, probing stdin"));
+	tty = ttyname(STDIN_FILENO);
+	if (tty == NULL) {
+	    tty = "";
+	}
+	if (pam_set_item(pamh, PAM_TTY, tty) != PAM_SUCCESS) {
+	    pam_syslog(pamh, LOG_ERR, "couldn't set tty name");
+	    return PAM_ABORT;
+	}
+    }
+    else
+      tty = (const char *) void_tty;
+
+    if (tty[0] == '/') {   /* full path */
+	const char *t;
+        tty++;
+        if ((t = strchr(tty, '/')) != NULL) {
+	    tty = t + 1;
+	}
+    }
+
+    /* 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));
+
+    retval = check_account(pamh,service,tty,user);          /* get groups */
+
+    return retval;
+}
+
+/* end of module definition */
-- 
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