Adding upstream version 1:4.13+dfsg1.upstream/1%4.13+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 506 insertions, 0 deletions

diff --git a/lib/gshadow.c b/lib/gshadow.c
new file mode 100644
index 0000000..2e12923
--- /dev/null
+++ b/lib/gshadow.c
@@ -0,0 +1,506 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008 - 2009, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+/* Newer versions of Linux libc already have shadow support.  */
+#if defined(SHADOWGRP) && !defined(HAVE_SHADOWGRP)	/*{ */
+
+#ident "$Id$"
+
+#include <stdio.h>
+#include "prototypes.h"
+#include "defines.h"
+static /*@null@*/FILE *shadow;
+static /*@null@*//*@only@*/char **members = NULL;
+static size_t nmembers = 0;
+static /*@null@*//*@only@*/char **admins = NULL;
+static size_t nadmins = 0;
+static struct sgrp sgroup;
+
+#define	FIELDS	4
+
+#ifdef	USE_NIS
+static bool nis_used;
+static bool nis_ignore;
+static enum { native, start, middle, native2 } nis_state;
+static bool nis_bound;
+static char *nis_domain;
+static char *nis_key;
+static int nis_keylen;
+static char *nis_val;
+static int nis_vallen;
+
+#define	IS_NISCHAR(c) ((c)=='+')
+#endif
+
+#ifdef	USE_NIS
+/*
+ * bind_nis - bind to NIS server
+ */
+
+static int bind_nis (void)
+{
+	if (yp_get_default_domain (&nis_domain))
+		return -1;
+
+	nis_bound = true;
+	return 0;
+}
+#endif
+
+static /*@null@*/char **build_list (char *s, char **list[], size_t * nlist)
+{
+	char **ptr = *list;
+	size_t nelem = *nlist, size;
+
+	while (s != NULL && *s != '\0') {
+		size = (nelem + 1) * sizeof (ptr);
+		ptr = realloc (*list, size);
+		if (NULL != ptr) {
+			ptr[nelem] = s;
+			nelem++;
+			*list = ptr;
+			*nlist = nelem;
+			s = strchr (s, ',');
+			if (NULL != s) {
+				*s = '\0';
+				s++;
+			}
+		}
+	}
+	size = (nelem + 1) * sizeof (ptr);
+	ptr = realloc (*list, size);
+	if (NULL != ptr) {
+		ptr[nelem] = NULL;
+		*list = ptr;
+	}
+	return ptr;
+}
+
+void setsgent (void)
+{
+#ifdef	USE_NIS
+	nis_state = native;
+#endif
+	if (NULL != shadow) {
+		rewind (shadow);
+	} else {
+		shadow = fopen (SGROUP_FILE, "r");
+	}
+}
+
+void endsgent (void)
+{
+	if (NULL != shadow) {
+		(void) fclose (shadow);
+	}
+
+	shadow = (FILE *) 0;
+}
+
+/*@observer@*//*@null@*/struct sgrp *sgetsgent (const char *string)
+{
+	static char *sgrbuf = NULL;
+	static size_t sgrbuflen = 0;
+
+	char *fields[FIELDS];
+	char *cp;
+	int i;
+	size_t len = strlen (string) + 1;
+
+	if (len > sgrbuflen) {
+		char *buf = (char *) realloc (sgrbuf, sizeof (char) * len);
+		if (NULL == buf) {
+			return NULL;
+		}
+		sgrbuf = buf;
+		sgrbuflen = len;
+	}
+
+	strncpy (sgrbuf, string, len);
+	sgrbuf[len-1] = '\0';
+
+	cp = strrchr (sgrbuf, '\n');
+	if (NULL != cp) {
+		*cp = '\0';
+	}
+
+	/*
+	 * There should be exactly 4 colon separated fields.  Find
+	 * all 4 of them and save the starting addresses in fields[].
+	 */
+
+	for (cp = sgrbuf, i = 0; (i < FIELDS) && (NULL != cp); i++) {
+		fields[i] = cp;
+		cp = strchr (cp, ':');
+		if (NULL != cp) {
+			*cp++ = '\0';
+		}
+	}
+
+	/*
+	 * If there was an extra field somehow, or perhaps not enough,
+	 * the line is invalid.
+	 */
+
+	if ((NULL != cp) || (i != FIELDS)) {
+#ifdef	USE_NIS
+		if (!IS_NISCHAR (fields[0][0])) {
+			return 0;
+		} else {
+			nis_used = true;
+		}
+#else
+		return 0;
+#endif
+	}
+
+	sgroup.sg_name = fields[0];
+	sgroup.sg_passwd = fields[1];
+	if (0 != nadmins) {
+		nadmins = 0;
+		free (admins);
+		admins = NULL;
+	}
+	if (0 != nmembers) {
+		nmembers = 0;
+		free (members);
+		members = NULL;
+	}
+	sgroup.sg_adm = build_list (fields[2], &admins, &nadmins);
+	sgroup.sg_mem = build_list (fields[3], &members, &nmembers);
+
+	return &sgroup;
+}
+
+/*
+ * fgetsgent - convert next line in stream to (struct sgrp)
+ *
+ * fgetsgent() reads the next line from the provided stream and
+ * converts it to a (struct sgrp).  NULL is returned on EOF.
+ */
+
+/*@observer@*//*@null@*/struct sgrp *fgetsgent (/*@null@*/FILE * fp)
+{
+	static size_t buflen = 0;
+	static char *buf = NULL;
+
+	char *cp;
+
+	if (0 == buflen) {
+		buf = (char *) malloc (BUFSIZ);
+		if (NULL == buf) {
+			return NULL;
+		}
+		buflen = BUFSIZ;
+	}
+
+	if (NULL == fp) {
+		return NULL;
+	}
+
+#ifdef	USE_NIS
+	while (fgetsx (buf, (int) buflen, fp) == buf)
+#else
+	if (fgetsx (buf, (int) buflen, fp) == buf)
+#endif
+	{
+		while (   ((cp = strrchr (buf, '\n')) == NULL)
+		       && (feof (fp) == 0)) {
+			size_t len;
+
+			cp = (char *) realloc (buf, buflen*2);
+			if (NULL == cp) {
+				return NULL;
+			}
+			buf = cp;
+			buflen *= 2;
+
+			len = strlen (buf);
+			if (fgetsx (&buf[len],
+			            (int) (buflen - len),
+			            fp) != &buf[len]) {
+				return NULL;
+			}
+		}
+		cp = strrchr (buf, '\n');
+		if (NULL != cp) {
+			*cp = '\0';
+		}
+#ifdef	USE_NIS
+		if (nis_ignore && IS_NISCHAR (buf[0])) {
+			continue;
+		}
+#endif
+		return (sgetsgent (buf));
+	}
+	return NULL;
+}
+
+/*
+ * getsgent - get a single shadow group entry
+ */
+
+/*@observer@*//*@null@*/struct sgrp *getsgent (void)
+{
+#ifdef	USE_NIS
+	bool nis_1_group = false;
+	struct sgrp *val;
+#endif
+	if (NULL == shadow) {
+		setsgent ();
+	}
+
+#ifdef	USE_NIS
+      again:
+	/*
+	 * See if we are reading from the local file.
+	 */
+
+	if (nis_state == native || nis_state == native2) {
+
+		/*
+		 * Get the next entry from the shadow group file.  Return
+		 * NULL right away if there is none.
+		 */
+
+		val = fgetsgent (shadow);
+		if (NULL == val) {
+			return 0;
+		}
+
+		/*
+		 * If this entry began with a NIS escape character, we have
+		 * to see if this is just a single group, or if the entire
+		 * map is being asked for.
+		 */
+
+		if (IS_NISCHAR (val->sg_name[0])) {
+			if ('\0' != val->sg_name[1]) {
+				nis_1_group = true;
+			} else {
+				nis_state = start;
+			}
+		}
+
+		/*
+		 * If this isn't a NIS group and this isn't an escape to go
+		 * use a NIS map, it must be a regular local group.
+		 */
+
+		if (!nis_1_group && (nis_state != start)) {
+			return val;
+		}
+
+		/*
+		 * If this is an escape to use an NIS map, switch over to
+		 * that bunch of code.
+		 */
+
+		if (nis_state == start) {
+			goto again;
+		}
+
+		/*
+		 * NEEDSWORK.  Here we substitute pieces-parts of this entry.
+		 */
+
+		return 0;
+	} else {
+		if (!nis_bound) {
+			if (bind_nis ()) {
+				nis_state = native2;
+				goto again;
+			}
+		}
+		if (nis_state == start) {
+			if (yp_first (nis_domain, "gshadow.byname", &nis_key,
+				      &nis_keylen, &nis_val, &nis_vallen)) {
+				nis_state = native2;
+				goto again;
+			}
+			nis_state = middle;
+		} else if (nis_state == middle) {
+			if (yp_next (nis_domain, "gshadow.byname", nis_key,
+				     nis_keylen, &nis_key, &nis_keylen,
+				     &nis_val, &nis_vallen)) {
+				nis_state = native2;
+				goto again;
+			}
+		}
+		return sgetsgent (nis_val);
+	}
+#else
+	return (fgetsgent (shadow));
+#endif
+}
+
+/*
+ * getsgnam - get a shadow group entry by name
+ */
+
+/*@observer@*//*@null@*/struct sgrp *getsgnam (const char *name)
+{
+	struct sgrp *sgrp;
+
+#ifdef	USE_NIS
+	static char save_name[16];
+	int nis_disabled = 0;
+#endif
+
+	setsgent ();
+
+#ifdef	USE_NIS
+	if (nis_used) {
+	      again:
+
+		/*
+		 * Search the gshadow.byname map for this group.
+		 */
+
+		if (!nis_bound) {
+			bind_nis ();
+		}
+
+		if (nis_bound) {
+			char *cp;
+
+			if (yp_match (nis_domain, "gshadow.byname", name,
+				      strlen (name), &nis_val,
+				      &nis_vallen) == 0) {
+				cp = strchr (nis_val, '\n');
+				if (NULL != cp) {
+					*cp = '\0';
+				}
+
+				nis_state = middle;
+				sgrp = sgetsgent (nis_val);
+				if (NULL != sgrp) {
+					strcpy (save_name, sgrp->sg_name);
+					nis_key = save_name;
+					nis_keylen = strlen (save_name);
+				}
+				return sgrp;
+			}
+		}
+		nis_state = native2;
+	}
+#endif
+#ifdef	USE_NIS
+	if (nis_used) {
+		nis_ignore = true;
+		nis_disabled = true;
+	}
+#endif
+	while ((sgrp = getsgent ()) != (struct sgrp *) 0) {
+		if (strcmp (name, sgrp->sg_name) == 0) {
+			break;
+		}
+	}
+#ifdef	USE_NIS
+	nis_ignore = false;
+#endif
+	return sgrp;
+}
+
+/*
+ * putsgent - output shadow group entry in text form
+ *
+ * putsgent() converts the contents of a (struct sgrp) to text and
+ * writes the result to the given stream.  This is the logical
+ * opposite of fgetsgent.
+ */
+
+int putsgent (const struct sgrp *sgrp, FILE * fp)
+{
+	char *buf, *cp;
+	int i;
+	size_t size;
+
+	if ((NULL == fp) || (NULL == sgrp)) {
+		return -1;
+	}
+
+	/* calculate the required buffer size */
+	size = strlen (sgrp->sg_name) + strlen (sgrp->sg_passwd) + 10;
+	for (i = 0; (NULL != sgrp->sg_adm) && (NULL != sgrp->sg_adm[i]); i++) {
+		size += strlen (sgrp->sg_adm[i]) + 1;
+	}
+	for (i = 0; (NULL != sgrp->sg_mem) && (NULL != sgrp->sg_mem[i]); i++) {
+		size += strlen (sgrp->sg_mem[i]) + 1;
+	}
+
+	buf = malloc (size);
+	if (NULL == buf) {
+		return -1;
+	}
+	cp = buf;
+
+	/*
+	 * Copy the group name and passwd.
+	 */
+
+	strcpy (cp, sgrp->sg_name);
+	cp += strlen (cp);
+	*cp++ = ':';
+
+	strcpy (cp, sgrp->sg_passwd);
+	cp += strlen (cp);
+	*cp++ = ':';
+
+	/*
+	 * Copy the administrators, separating each from the other
+	 * with a ",".
+	 */
+
+	for (i = 0; NULL != sgrp->sg_adm[i]; i++) {
+		if (i > 0) {
+			*cp++ = ',';
+		}
+
+		strcpy (cp, sgrp->sg_adm[i]);
+		cp += strlen (cp);
+	}
+	*cp = ':';
+	cp++;
+
+	/*
+	 * Now do likewise with the group members.
+	 */
+
+	for (i = 0; NULL != sgrp->sg_mem[i]; i++) {
+		if (i > 0) {
+			*cp = ',';
+			cp++;
+		}
+
+		strcpy (cp, sgrp->sg_mem[i]);
+		cp += strlen (cp);
+	}
+	*cp = '\n';
+	cp++;
+	*cp = '\0';
+
+	/*
+	 * Output using the function which understands the line
+	 * continuation conventions.
+	 */
+
+	if (fputsx (buf, fp) == EOF) {
+		free (buf);
+		return -1;
+	}
+
+	free (buf);
+	return 0;
+}
+#else
+extern int errno;		/* warning: ANSI C forbids an empty source file */
+#endif				/*} SHADOWGRP */