Adding upstream version 1.5.2.upstream/1.5.2upstream

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

1 files changed, 392 insertions, 0 deletions

diff --git a/libpam/pam_env.c b/libpam/pam_env.c
new file mode 100644
index 0000000..1c8403d
--- /dev/null
+++ b/libpam/pam_env.c
@@ -0,0 +1,392 @@
+/*
+ * pam_env.c
+ *
+ * Copyright (c) Andrew G. Morgan <morgan@parc.power.net> 1996,1997
+ * All rights reserved.
+ *
+ * This file was written from a "hint" provided by the people at SUN.
+ * and the X/Open XSSO draft of March 1997.
+ *
+ * $Id$
+ */
+
+#include "pam_private.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+#ifdef sunos
+#define memmove(x,y,z) bcopy(y,x,z)
+#endif
+
+/* helper functions */
+
+#ifdef PAM_DEBUG
+static void _pam_dump_env(pam_handle_t *pamh)
+{
+    int i;
+
+    D(("Listing environment of pamh=%p", pamh));
+    D(("pamh->env = %p", pamh->env));
+    D(("environment entries used = %d [of %d allocated]"
+       , pamh->env->requested, pamh->env->entries));
+
+    for (i=0; i<pamh->env->requested; ++i) {
+	_pam_output_debug(">%-3d [%9p]:[%s]"
+			  , i, pamh->env->list[i], pamh->env->list[i]);
+    }
+    _pam_output_debug("*NOTE* the last item should be (nil)");
+}
+#else
+#define _pam_dump_env(x)
+#endif
+
+/*
+ * Create the environment
+ */
+
+int _pam_make_env(pam_handle_t *pamh)
+{
+    D(("called."));
+
+    IF_NO_PAMH("_pam_make_env", pamh, PAM_ABORT);
+
+    /*
+     * get structure memory
+     */
+
+    pamh->env = (struct pam_environ *) malloc(sizeof(struct pam_environ));
+    if (pamh->env == NULL) {
+	pam_syslog(pamh, LOG_CRIT, "_pam_make_env: out of memory");
+	return PAM_BUF_ERR;
+    }
+
+    /*
+     * get list memory
+     */
+
+    pamh->env->list = (char **)calloc( PAM_ENV_CHUNK, sizeof(char *) );
+    if (pamh->env->list == NULL) {
+	pam_syslog(pamh, LOG_CRIT, "_pam_make_env: no memory for list");
+	_pam_drop(pamh->env);
+	return PAM_BUF_ERR;
+    }
+
+    /*
+     * fill entries in pamh->env
+     */
+
+    pamh->env->entries = PAM_ENV_CHUNK;
+    pamh->env->requested = 1;
+    pamh->env->list[0] = NULL;
+
+    _pam_dump_env(pamh);                    /* only active when debugging */
+
+    return PAM_SUCCESS;
+}
+
+/*
+ * purge the environment
+ */
+
+void _pam_drop_env(pam_handle_t *pamh)
+{
+    D(("called."));
+    IF_NO_PAMH("_pam_make_env", pamh, /* nothing to return */);
+
+    if (pamh->env != NULL) {
+	int i;
+	/* we will only purge the pamh->env->requested number of elements */
+
+	for (i=pamh->env->requested-1; i-- > 0; ) {
+	    D(("dropping #%3d>%s<", i, pamh->env->list[i]));
+	    _pam_overwrite(pamh->env->list[i]);          /* clean */
+	    _pam_drop(pamh->env->list[i]);              /* forget */
+	}
+	pamh->env->requested = 0;
+	pamh->env->entries = 0;
+	_pam_drop(pamh->env->list);                     /* forget */
+	_pam_drop(pamh->env);                           /* forget */
+    } else {
+	D(("no environment present in pamh?"));
+    }
+}
+
+/*
+ * Return the item number of the given variable = first 'length' chars
+ * of 'name_value'. Since this is a static function, it is safe to
+ * assume its supplied arguments are well defined.
+ */
+
+static int _pam_search_env(const struct pam_environ *env
+			   , const char *name_value, int length)
+{
+    int i;
+
+    for (i=env->requested-1; i-- > 0; ) {
+	if (strncmp(name_value,env->list[i],length) == 0
+	    && env->list[i][length] == '=') {
+
+	    return i;                                   /* Got it! */
+
+	}
+    }
+
+    return -1;                                          /* no luck */
+}
+
+/*
+ * externally visible functions
+ */
+
+/*
+ *  pam_putenv(): Add/replace/delete a PAM-environment variable.
+ *
+ *  Add/replace:
+ *      name_value = "NAME=VALUE" or "NAME=" (for empty value="\0")
+ *
+ *  delete:
+ *      name_value = "NAME"
+ */
+
+int pam_putenv(pam_handle_t *pamh, const char *name_value)
+{
+    int l2eq, item, retval;
+
+    D(("called."));
+    IF_NO_PAMH("pam_putenv", pamh, PAM_ABORT);
+
+    if (name_value == NULL) {
+	pam_syslog(pamh, LOG_ERR, "pam_putenv: no variable indicated");
+	return PAM_PERM_DENIED;
+    }
+
+    /*
+     * establish if we are setting or deleting; scan for '='
+     */
+
+    for (l2eq=0; name_value[l2eq] && name_value[l2eq] != '='; ++l2eq);
+    if (l2eq <= 0) {
+	pam_syslog(pamh, LOG_ERR, "pam_putenv: bad variable");
+	return PAM_BAD_ITEM;
+    }
+
+    /*
+     *  Look first for environment.
+     */
+
+    if (pamh->env == NULL || pamh->env->list == NULL) {
+	pam_syslog(pamh, LOG_ERR, "pam_putenv: no env%s found",
+		       pamh->env == NULL ? "":"-list");
+	return PAM_ABORT;
+    }
+
+    /* find the item to replace */
+
+    item = _pam_search_env(pamh->env, name_value, l2eq);
+
+    if (name_value[l2eq]) {                     /* (re)setting */
+
+	if (item == -1) {                      /* new variable */
+	    D(("adding item: %s", name_value));
+	    /* enough space? */
+	    if (pamh->env->entries <= pamh->env->requested) {
+		register int i;
+		register char **tmp;
+
+		/* get some new space */
+		tmp = calloc( pamh->env->entries + PAM_ENV_CHUNK
+				     , sizeof(char *) );
+		if (tmp == NULL) {
+		    /* nothing has changed - old env intact */
+		    pam_syslog(pamh, LOG_CRIT,
+			       "pam_putenv: cannot grow environment");
+		    return PAM_BUF_ERR;
+		}
+
+		/* copy old env-item pointers/forget old */
+		for (i=0; i<pamh->env->requested; ++i) {
+		    tmp[i] = pamh->env->list[i];
+		    pamh->env->list[i] = NULL;
+		}
+
+		/* drop old list and replace with new */
+		_pam_drop(pamh->env->list);
+		pamh->env->list = tmp;
+		pamh->env->entries += PAM_ENV_CHUNK;
+
+		D(("resized env list"));
+		_pam_dump_env(pamh);              /* only when debugging */
+	    }
+
+	    item = pamh->env->requested-1;        /* old last item (NULL) */
+
+	    /* add a new NULL entry at end; increase counter */
+	    pamh->env->list[pamh->env->requested++] = NULL;
+
+	} else {                                /* replace old */
+	    D(("replacing item: %s\n          with: %s"
+	       , pamh->env->list[item], name_value));
+	    _pam_overwrite(pamh->env->list[item]);
+	    _pam_drop(pamh->env->list[item]);
+	}
+
+	/*
+	 * now we have a place to put the new env-item, insert at 'item'
+	 */
+
+	pamh->env->list[item] = _pam_strdup(name_value);
+	if (pamh->env->list[item] != NULL) {
+	    _pam_dump_env(pamh);                   /* only when debugging */
+	    return PAM_SUCCESS;
+	}
+
+	/* something went wrong; we should delete the item - fall through */
+
+	retval = PAM_BUF_ERR;                        /* an error occurred */
+    } else {
+	retval = PAM_SUCCESS;                      /* we requested delete */
+    }
+
+    /* getting to here implies we are deleting an item */
+
+    if (item < 0) {
+	pam_syslog(pamh, LOG_ERR,
+		   "pam_putenv: delete non-existent entry; %s", name_value);
+	return PAM_BAD_ITEM;
+    }
+
+    /*
+     * remove item: purge memory; reset counter; resize [; display-env]
+     */
+
+    D(("deleting: env#%3d:[%s]", item, pamh->env->list[item]));
+    _pam_overwrite(pamh->env->list[item]);
+    _pam_drop(pamh->env->list[item]);
+    --(pamh->env->requested);
+    D(("mmove: item[%d]+%d -> item[%d]"
+       , item+1, ( pamh->env->requested - item ), item));
+    (void) memmove(&pamh->env->list[item], &pamh->env->list[item+1]
+		   , ( pamh->env->requested - item )*sizeof(char *) );
+
+    _pam_dump_env(pamh);                   /* only when debugging */
+
+    /*
+     * deleted.
+     */
+
+    return retval;
+}
+
+/*
+ *  Return the value of the requested environment variable
+ */
+
+const char *pam_getenv(pam_handle_t *pamh, const char *name)
+{
+    int item;
+
+    D(("called."));
+    IF_NO_PAMH("pam_getenv", pamh, NULL);
+
+    if (name == NULL) {
+	pam_syslog(pamh, LOG_ERR, "pam_getenv: no variable indicated");
+	return NULL;
+    }
+
+    if (pamh->env == NULL || pamh->env->list == NULL) {
+	pam_syslog(pamh, LOG_ERR, "pam_getenv: no env%s found",
+		   pamh->env == NULL ? "":"-list" );
+	return NULL;
+    }
+
+    /* find the requested item */
+
+    item = _pam_search_env(pamh->env, name, strlen(name));
+    if (item != -1) {
+
+	D(("env-item: %s, found!", name));
+	return (pamh->env->list[item] + 1 + strlen(name));
+
+    } else {
+
+	D(("env-item: %s, not found", name));
+	return NULL;
+
+    }
+}
+
+static char **_copy_env(pam_handle_t *pamh)
+{
+    char **dump;
+    int i = pamh->env->requested;          /* reckon size of environment */
+    char *const *env = pamh->env->list;
+
+    D(("now get some memory for dump"));
+
+    /* allocate some memory for this (plus the null tail-pointer) */
+    dump = (char **) calloc(i, sizeof(char *));
+    D(("dump = %p", dump));
+    if (dump == NULL) {
+	return NULL;
+    }
+
+    /* now run through entries and copy the variables over */
+    dump[--i] = NULL;
+    while (i-- > 0) {
+	D(("env[%d]=`%s'", i,env[i]));
+	dump[i] = _pam_strdup(env[i]);
+	D(("->dump[%d]=`%s'", i,dump[i]));
+	if (dump[i] == NULL) {
+	    /* out of memory */
+
+	    while (dump[++i]) {
+		_pam_overwrite(dump[i]);
+		_pam_drop(dump[i]);
+	    }
+	    _pam_drop(dump);
+	    return NULL;
+	}
+    }
+
+    env = NULL;                             /* forget now */
+
+    /* return transcribed environment */
+    return dump;
+}
+
+char **pam_getenvlist(pam_handle_t *pamh)
+{
+    int i;
+
+    D(("called."));
+    IF_NO_PAMH("pam_getenvlist", pamh, NULL);
+
+    if (pamh->env == NULL || pamh->env->list == NULL) {
+	pam_syslog(pamh, LOG_ERR, "pam_getenvlist: no env%s found",
+		   pamh->env == NULL ? "":"-list" );
+	return NULL;
+    }
+
+    /* some quick checks */
+
+    if (pamh->env->requested > pamh->env->entries) {
+	pam_syslog(pamh, LOG_ERR, "pam_getenvlist: environment corruption");
+	_pam_dump_env(pamh);                 /* only active when debugging */
+	return NULL;
+    }
+
+    for (i=pamh->env->requested-1; i-- > 0; ) {
+	if (pamh->env->list[i] == NULL) {
+	    pam_syslog(pamh, LOG_ERR, "pam_getenvlist: environment broken");
+	    _pam_dump_env(pamh);              /* only active when debugging */
+	    return NULL;          /* somehow we've broken the environment!? */
+	}
+    }
+
+    /* Seems fine; copy environment */
+
+    _pam_dump_env(pamh);                    /* only active when debugging */
+
+    return _copy_env(pamh);
+}