pw(8) -- a backend utility to manage the user and group databases.

sysinstall's new User&group menu will use it, hence it's a 2.2
candidate despite of providing new functionality.

Submitted by:	David L. Nugent, <davidn@blaze.net.au>

1 files changed, 273 insertions, 0 deletions

diff --git a/pw/pw_group.c b/pw/pw_group.c
new file mode 100644
index 0000000..d189ccc
--- /dev/null
+++ b/pw/pw_group.c
@@ -0,0 +1,273 @@
+/*-
+ * Copyright (c) 1996 by David L. Nugent <davidn@blaze.net.au>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer as
+ *    the first lines of this file unmodified.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by David L. Nugent.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DAVID L. NUGENT ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	$Id$
+ */
+
+#include <unistd.h>
+#include <ctype.h>
+#include <termios.h>
+
+#include "pw.h"
+#include "bitmap.h"
+
+
+static int      print_group(struct group * grp, int pretty);
+static gid_t    gr_gidpolicy(struct userconf * cnf, struct cargs * args);
+
+int
+pw_group(struct userconf * cnf, int mode, struct cargs * args)
+{
+	struct carg    *a_name = getarg(args, 'n');
+	struct carg    *a_gid = getarg(args, 'g');
+	struct carg    *arg;
+	struct group   *grp = NULL;
+	char           *members[_UC_MAXGROUPS];
+
+	static struct group fakegroup =
+	{
+		"nogroup",
+		"*",
+		-1,
+		NULL
+	};
+
+	if (mode == M_PRINT && getarg(args, 'a')) {
+		int             pretty = getarg(args, 'p') != NULL;
+
+		setgrent();
+		while ((grp = getgrent()) != NULL)
+			print_group(grp, pretty);
+		endgrent();
+		return X_ALLOK;
+	}
+	if (a_gid == NULL) {
+		if (a_name == NULL)
+			cmderr(X_CMDERR, "group name or id required\n");
+
+		if (mode != M_ADD && grp == NULL && isdigit(*a_name->val)) {
+			(a_gid = a_name)->ch = 'g';
+			a_name = NULL;
+		}
+	}
+	grp = (a_name != NULL) ? getgrnam(a_name->val) : getgrgid((gid_t) atoi(a_gid->val));
+
+	if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
+		if (a_name == NULL && grp == NULL)	/* Try harder */
+			grp = getgrgid(atoi(a_gid->val));
+
+		if (grp == NULL) {
+			if (mode == M_PRINT && getarg(args, 'F')) {
+				fakegroup.gr_name = a_name ? a_name->val : "nogroup";
+				fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1;
+				return print_group(&fakegroup, getarg(args, 'p') != NULL);
+			}
+			cmderr(X_CMDERR, "unknown group `%s'\n", a_name ? a_name->val : a_gid->val);
+		}
+		if (a_name == NULL)	/* Needed later */
+			a_name = addarg(args, 'n', grp->gr_name);
+
+		/*
+		 * Handle deletions now
+		 */
+		if (mode == M_DELETE) {
+			gid_t           gid = grp->gr_gid;
+
+			if (delgrent(grp) == -1)
+				cmderr(X_NOUPDATE, "Error updating group file: %s\n", strerror(errno));
+			pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid);
+			return X_ALLOK;
+		} else if (mode == M_PRINT)
+			return print_group(grp, getarg(args, 'p') != NULL);
+
+		if (a_gid)
+			grp->gr_gid = (gid_t) atoi(a_gid->val);
+
+		if ((arg = getarg(args, 'l')) != NULL)
+			grp->gr_name = arg->val;
+	} else {
+		if (a_name == NULL)	/* Required */
+			cmderr(X_CMDERR, "group name required\n");
+		else if (grp != NULL)	/* Exists */
+			cmderr(X_EXISTS, "group name `%s' already exists\n", a_name->val);
+
+		memset(members, 0, sizeof members);
+		grp = &fakegroup;
+		grp->gr_name = a_name->val;
+		grp->gr_passwd = "*";
+		grp->gr_gid = gr_gidpolicy(cnf, args);
+		grp->gr_mem = members;
+	}
+
+	/*
+	 * This allows us to set a group password Group passwords is an
+	 * antique idea, rarely used and insecure (no secure database) Should
+	 * be discouraged, but it is apparently still supported by some
+	 * software.
+	 */
+
+	if ((arg = getarg(args, 'h')) != NULL) {
+		if (strcmp(arg->val, "-") == 0)
+			grp->gr_passwd = "*";	/* No access */
+		else {
+			int             fd = atoi(arg->val);
+			int             b;
+			int             istty = isatty(fd);
+			struct termios  t;
+			char           *p, line[256];
+
+			if (istty) {
+				if (tcgetattr(fd, &t) == -1)
+					istty = 0;
+				else {
+					struct termios  n = t;
+
+					/* Disable echo */
+					n.c_lflag &= ~(ECHO);
+					tcsetattr(fd, TCSANOW, &n);
+					printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
+					fflush(stdout);
+				}
+			}
+			b = read(fd, line, sizeof(line) - 1);
+			if (istty) {	/* Restore state */
+				tcsetattr(fd, TCSANOW, &t);
+				fputc('\n', stdout);
+				fflush(stdout);
+			}
+			if (b < 0) {
+				perror("-h file descriptor");
+				return X_CMDERR;
+			}
+			line[b] = '\0';
+			if ((p = strpbrk(line, " \t\r\n")) != NULL)
+				*p = '\0';
+			if (!*line)
+				cmderr(X_CMDERR, "empty password read on file descriptor %d\n", fd);
+			grp->gr_passwd = pw_pwcrypt(line);
+		}
+	}
+	if ((mode == M_ADD && !addgrent(grp)) || (mode == M_UPDATE && !chggrent(a_name->val, grp))) {
+		perror("group update");
+		return X_NOUPDATE;
+	}
+	/* grp may have been invalidated */
+	if ((grp = getgrnam(a_name->val)) == NULL)
+		cmderr(X_NOTFOUND, "group disappeared during update\n");
+
+	pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);
+
+	return X_ALLOK;
+}
+
+
+static          gid_t
+gr_gidpolicy(struct userconf * cnf, struct cargs * args)
+{
+	struct group   *grp;
+	gid_t           gid = (gid_t) - 1;
+	struct carg    *a_gid = getarg(args, 'g');
+
+	/*
+	 * Check the given gid, if any
+	 */
+	if (a_gid != NULL) {
+		gid = (gid_t) atol(a_gid->val);
+
+		if ((grp = getgrgid(gid)) != NULL && getarg(args, 'o') == NULL)
+			cmderr(X_EXISTS, "gid `%ld' has already been allocated\n", (long) grp->gr_gid);
+	} else {
+		struct bitmap   bm;
+
+		/*
+		 * We need to allocate the next available gid under one of
+		 * two policies a) Grab the first unused gid b) Grab the
+		 * highest possible unused gid
+		 */
+		if (cnf->min_gid >= cnf->max_gid) {	/* Sanity claus^H^H^H^Hheck */
+			cnf->min_gid = 1000;
+			cnf->max_gid = 32000;
+		}
+		bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
+
+		/*
+		 * Now, let's fill the bitmap from the password file
+		 */
+		setgrent();
+		while ((grp = getgrent()) != NULL)
+			if (grp->gr_gid >= (int) cnf->min_gid && grp->gr_gid <= (int) cnf->max_gid)
+				bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
+		endgrent();
+
+		/*
+		 * Then apply the policy, with fallback to reuse if necessary
+		 */
+		if (cnf->reuse_gids)
+			gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
+		else {
+			gid = (gid_t) (bm_lastset(&bm) + 1);
+			if (!bm_isset(&bm, gid))
+				gid += cnf->min_gid;
+			else
+				gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
+		}
+
+		/*
+		 * Another sanity check
+		 */
+		if (gid < cnf->min_gid || gid > cnf->max_gid)
+			cmderr(X_EXISTS, "unable to allocate a new gid - range fully used\n");
+		bm_dealloc(&bm);
+	}
+	return gid;
+}
+
+
+static int
+print_group(struct group * grp, int pretty)
+{
+	if (!pretty) {
+		char            buf[_UC_MAXLINE];
+
+		fmtgrent(buf, grp);
+		fputs(buf, stdout);
+	} else {
+		int             i;
+
+		printf("Group Name : %-10s   #%lu\n"
+		       "   Members : ",
+		       grp->gr_name, (long) grp->gr_gid);
+		for (i = 0; i < _UC_MAXGROUPS && grp->gr_mem[i]; i++)
+			printf("%s%s", i ? "," : "", grp->gr_mem[i]);
+		fputs("\n\n", stdout);
+	}
+	return X_ALLOK;
+}