snapshot of project "lynx", label v2-8-8dev_11

1 files changed, 766 insertions, 0 deletions

diff --git a/WWW/Library/Implementation/HTGroup.c b/WWW/Library/Implementation/HTGroup.c
new file mode 100644
index 00000000..34c8b32e
--- /dev/null
+++ b/WWW/Library/Implementation/HTGroup.c
@@ -0,0 +1,766 @@
+/* MODULE							HTGroup.c
+ *		GROUP FILE ROUTINES
+ *
+ *	Contains group file parser and routines to match IP
+ *	address templates and to find out group membership.
+ *
+ *
+ * AUTHORS:
+ *	AL	Ari Luotonen	luotonen@dxcern.cern.ch
+ *
+ * HISTORY:
+ *
+ *
+ * BUGS:
+ *
+ *
+ *
+ * GROUP DEFINITION GRAMMAR:
+ *
+ *	string = "sequence of alphanumeric characters"
+ *	user_name ::= string
+ *	group_name ::= string
+ *	group_ref ::= group_name
+ *	user_def ::= user_name | group_ref
+ *	user_def_list ::= user_def { ',' user_def }
+ *	user_part = user_def | '(' user_def_list ')'
+ *
+ *	templ = "sequence of alphanumeric characters and '*'s"
+ *	ip_number_mask ::= templ '.' templ '.' templ '.' templ
+ *	domain_name_mask ::= templ { '.' templ }
+ *	address ::= ip_number_mask | domain_name_mask
+ *	address_def ::= address
+ *	address_def_list ::= address_def { ',' address_def }
+ *	address_part = address_def | '(' address_def_list ')'
+ *
+ *	item ::= [user_part] ['@' address_part]
+ *	item_list ::= item { ',' item }
+ *	group_def ::= item_list
+ *	group_decl ::= group_name ':' group_def
+ *
+ */
+
+#include <HTUtils.h>
+
+#include <HTAAUtil.h>
+#include <HTLex.h>		/* Lexical analysor     */
+#include <HTGroup.h>		/* Implemented here     */
+
+#include <LYUtils.h>
+#include <LYLeaks.h>
+
+/*
+ * Group file parser
+ */
+
+typedef HTList UserDefList;
+typedef HTList AddressDefList;
+
+typedef struct {
+    UserDefList *user_def_list;
+    AddressDefList *address_def_list;
+} Item;
+
+typedef struct {
+    char *name;
+    GroupDef *translation;
+} Ref;
+
+static void syntax_error(FILE *fp, const char *msg,
+			 LexItem lex_item)
+{
+    char buffer[41];
+    int cnt = 0;
+    int ch;
+
+    while ((ch = getc(fp)) != EOF && ch != '\n')
+	if (cnt < 40)
+	    buffer[cnt++] = (char) ch;
+    buffer[cnt] = (char) 0;
+
+    CTRACE((tfp, "%s %d before: '%s'\nHTGroup.c: %s (got %s)\n",
+	    "HTGroup.c: Syntax error in rule file at line",
+	    HTlex_line, buffer, msg, lex_verbose(lex_item)));
+    HTlex_line++;
+}
+
+static AddressDefList *parse_address_part(FILE *fp)
+{
+    AddressDefList *address_def_list = NULL;
+    LexItem lex_item;
+    BOOL only_one = NO;
+
+    lex_item = lex(fp);
+    if (lex_item == LEX_ALPH_STR || lex_item == LEX_TMPL_STR)
+	only_one = YES;
+    else if (lex_item != LEX_OPEN_PAREN ||
+	     ((lex_item = lex(fp)) != LEX_ALPH_STR &&
+	      lex_item != LEX_TMPL_STR)) {
+	syntax_error(fp, "Expecting a single address or '(' beginning list",
+		     lex_item);
+	return NULL;
+    }
+    address_def_list = HTList_new();
+
+    for (;;) {
+	Ref *ref = typecalloc(Ref);
+
+	if (ref == NULL)
+	    outofmem(__FILE__, "parse_address_part");
+
+	assert(ref != NULL);
+
+	ref->name = NULL;
+	ref->translation = NULL;
+	StrAllocCopy(ref->name, HTlex_buffer);
+
+	HTList_addObject(address_def_list, (void *) ref);
+
+	if (only_one || (lex_item = lex(fp)) != LEX_ITEM_SEP)
+	    break;
+	/*
+	 * Here lex_item == LEX_ITEM_SEP; after item separator it
+	 * is ok to have one or more newlines (LEX_REC_SEP) and
+	 * they are ignored (continuation line).
+	 */
+	do {
+	    lex_item = lex(fp);
+	} while (lex_item == LEX_REC_SEP);
+
+	if (lex_item != LEX_ALPH_STR && lex_item != LEX_TMPL_STR) {
+	    syntax_error(fp, "Expecting an address template", lex_item);
+	    HTList_delete(address_def_list);
+	    address_def_list = NULL;
+	    return NULL;
+	}
+    }
+
+    if (!only_one && lex_item != LEX_CLOSE_PAREN) {
+	HTList_delete(address_def_list);
+	address_def_list = NULL;
+	syntax_error(fp, "Expecting ')' closing address list", lex_item);
+	return NULL;
+    }
+    return address_def_list;
+}
+
+static UserDefList *parse_user_part(FILE *fp)
+{
+    UserDefList *user_def_list = NULL;
+    LexItem lex_item;
+    BOOL only_one = NO;
+
+    lex_item = lex(fp);
+    if (lex_item == LEX_ALPH_STR)
+	only_one = YES;
+    else if (lex_item != LEX_OPEN_PAREN ||
+	     (lex_item = lex(fp)) != LEX_ALPH_STR) {
+	syntax_error(fp, "Expecting a single name or '(' beginning list",
+		     lex_item);
+	return NULL;
+    }
+    user_def_list = HTList_new();
+
+    for (;;) {
+	Ref *ref = typecalloc(Ref);
+
+	if (ref == NULL)
+	    outofmem(__FILE__, "parse_user_part");
+
+	assert(ref != NULL);
+
+	ref->name = NULL;
+	ref->translation = NULL;
+	StrAllocCopy(ref->name, HTlex_buffer);
+
+	HTList_addObject(user_def_list, (void *) ref);
+
+	if (only_one || (lex_item = lex(fp)) != LEX_ITEM_SEP)
+	    break;
+	/*
+	 * Here lex_item == LEX_ITEM_SEP; after item separator it
+	 * is ok to have one or more newlines (LEX_REC_SEP) and
+	 * they are ignored (continuation line).
+	 */
+	do {
+	    lex_item = lex(fp);
+	} while (lex_item == LEX_REC_SEP);
+
+	if (lex_item != LEX_ALPH_STR) {
+	    syntax_error(fp, "Expecting user or group name", lex_item);
+	    HTList_delete(user_def_list);
+	    user_def_list = NULL;
+	    return NULL;
+	}
+    }
+
+    if (!only_one && lex_item != LEX_CLOSE_PAREN) {
+	HTList_delete(user_def_list);
+	user_def_list = NULL;
+	syntax_error(fp, "Expecting ')' closing user/group list", lex_item);
+	return NULL;
+    }
+    return user_def_list;
+}
+
+static Item *parse_item(FILE *fp)
+{
+    Item *item = NULL;
+    UserDefList *user_def_list = NULL;
+    AddressDefList *address_def_list = NULL;
+    LexItem lex_item;
+
+    lex_item = lex(fp);
+    if (lex_item == LEX_ALPH_STR || lex_item == LEX_OPEN_PAREN) {
+	unlex(lex_item);
+	user_def_list = parse_user_part(fp);
+	lex_item = lex(fp);
+    }
+
+    if (lex_item == LEX_AT_SIGN) {
+	lex_item = lex(fp);
+	if (lex_item == LEX_ALPH_STR || lex_item == LEX_TMPL_STR ||
+	    lex_item == LEX_OPEN_PAREN) {
+	    unlex(lex_item);
+	    address_def_list = parse_address_part(fp);
+	} else {
+	    if (user_def_list) {
+		HTList_delete(user_def_list);	/* @@@@ */
+		user_def_list = NULL;
+	    }
+	    syntax_error(fp, "Expected address part (single address or list)",
+			 lex_item);
+	    return NULL;
+	}
+    } else
+	unlex(lex_item);
+
+    if (!user_def_list && !address_def_list) {
+	syntax_error(fp, "Empty item not allowed", lex_item);
+	return NULL;
+    }
+    item = typecalloc(Item);
+    if (item == NULL)
+	outofmem(__FILE__, "parse_item");
+
+    assert(item != NULL);
+
+    item->user_def_list = user_def_list;
+    item->address_def_list = address_def_list;
+    return item;
+}
+
+static ItemList *parse_item_list(FILE *fp)
+{
+    ItemList *item_list = HTList_new();
+    Item *item;
+    LexItem lex_item;
+
+    for (;;) {
+	if (!(item = parse_item(fp))) {
+	    HTList_delete(item_list);	/* @@@@ */
+	    item_list = NULL;
+	    return NULL;
+	}
+	HTList_addObject(item_list, (void *) item);
+	lex_item = lex(fp);
+	if (lex_item != LEX_ITEM_SEP) {
+	    unlex(lex_item);
+	    return item_list;
+	}
+	/*
+	 * Here lex_item == LEX_ITEM_SEP; after item separator it
+	 * is ok to have one or more newlines (LEX_REC_SEP) and
+	 * they are ignored (continuation line).
+	 */
+	do {
+	    lex_item = lex(fp);
+	} while (lex_item == LEX_REC_SEP);
+	unlex(lex_item);
+    }
+}
+
+GroupDef *HTAA_parseGroupDef(FILE *fp)
+{
+    ItemList *item_list = NULL;
+    GroupDef *group_def = NULL;
+    LexItem lex_item;
+
+    if (!(item_list = parse_item_list(fp))) {
+	return NULL;
+    }
+    group_def = typecalloc(GroupDef);
+    if (group_def == NULL)
+	outofmem(__FILE__, "HTAA_parseGroupDef");
+
+    assert(group_def != NULL);
+
+    group_def->group_name = NULL;
+    group_def->item_list = item_list;
+
+    if ((lex_item = lex(fp)) != LEX_REC_SEP) {
+	syntax_error(fp, "Garbage after group definition", lex_item);
+    }
+
+    return group_def;
+}
+
+#if 0
+static GroupDef *parse_group_decl(FILE *fp)
+{
+    char *group_name = NULL;
+    GroupDef *group_def = NULL;
+    LexItem lex_item;
+
+    do {
+	lex_item = lex(fp);
+    } while (lex_item == LEX_REC_SEP);	/* Ignore empty lines */
+
+    if (lex_item != LEX_ALPH_STR) {
+	if (lex_item != LEX_EOF)
+	    syntax_error(fp, "Expecting group name", lex_item);
+	return NULL;
+    }
+    StrAllocCopy(group_name, HTlex_buffer);
+
+    if (LEX_FIELD_SEP != (lex_item = lex(fp))) {
+	syntax_error(fp, "Expecting field separator", lex_item);
+	FREE(group_name);
+	return NULL;
+    }
+
+    if (!(group_def = HTAA_parseGroupDef(fp))) {
+	FREE(group_name);
+	return NULL;
+    }
+    group_def->group_name = group_name;
+
+    return group_def;
+}
+
+/*
+ * Group manipulation routines
+ */
+
+static GroupDef *find_group_def(GroupDefList *group_list,
+				const char *group_name)
+{
+    if (group_list && group_name) {
+	GroupDefList *cur = group_list;
+	GroupDef *group_def;
+
+	while (NULL != (group_def = (GroupDef *) HTList_nextObject(cur))) {
+	    if (!strcmp(group_name, group_def->group_name)) {
+		return group_def;
+	    }
+	}
+    }
+    return NULL;
+}
+
+void HTAA_resolveGroupReferences(GroupDef *group_def,
+				 GroupDefList *group_def_list)
+{
+    if (group_def && group_def->item_list && group_def_list) {
+	ItemList *cur1 = group_def->item_list;
+	Item *item;
+
+	while (NULL != (item = (Item *) HTList_nextObject(cur1))) {
+	    UserDefList *cur2 = item->user_def_list;
+	    Ref *ref;
+
+	    while (NULL != (ref = (Ref *) HTList_nextObject(cur2)))
+		ref->translation = find_group_def(group_def_list, ref->name);
+
+	    /* Does NOT translate address_def_list */
+	}
+    }
+}
+
+static void add_group_def(GroupDefList *group_def_list,
+			  GroupDef *group_def)
+{
+    HTAA_resolveGroupReferences(group_def, group_def_list);
+    HTList_addObject(group_def_list, (void *) group_def);
+}
+
+static GroupDefList *parse_group_file(FILE *fp)
+{
+    GroupDefList *group_def_list = HTList_new();
+    GroupDef *group_def;
+
+    while (NULL != (group_def = parse_group_decl(fp)))
+	add_group_def(group_def_list, group_def);
+
+    return group_def_list;
+}
+#endif
+
+/*
+ * Trace functions
+ */
+
+static void print_item(Item *item)
+{
+    if (!item)
+	fprintf(tfp, "\tNULL-ITEM\n");
+    else {
+	UserDefList *cur1 = item->user_def_list;
+	AddressDefList *cur2 = item->address_def_list;
+	Ref *user_ref = (Ref *) HTList_nextObject(cur1);
+	Ref *addr_ref = (Ref *) HTList_nextObject(cur2);
+
+	if (user_ref) {
+	    fprintf(tfp, "\t[%s%s", user_ref->name,
+		    (user_ref->translation ? "*REF*" : ""));
+	    while (NULL != (user_ref = (Ref *) HTList_nextObject(cur1)))
+		fprintf(tfp, "; %s%s", user_ref->name,
+			(user_ref->translation ? "*REF*" : ""));
+	    fprintf(tfp, "] ");
+	} else
+	    fprintf(tfp, "\tANYBODY ");
+
+	if (addr_ref) {
+	    fprintf(tfp, "@ [%s", addr_ref->name);
+	    while (NULL != (addr_ref = (Ref *) HTList_nextObject(cur2)))
+		fprintf(tfp, "; %s", addr_ref->name);
+	    fprintf(tfp, "]\n");
+	} else
+	    fprintf(tfp, "@ ANYADDRESS\n");
+    }
+}
+
+static void print_item_list(ItemList *item_list)
+{
+    ItemList *cur = item_list;
+    Item *item;
+
+    if (!item_list)
+	fprintf(tfp, "EMPTY");
+    else
+	while (NULL != (item = (Item *) HTList_nextObject(cur)))
+	    print_item(item);
+}
+
+void HTAA_printGroupDef(GroupDef *group_def)
+{
+    if (!group_def) {
+	fprintf(tfp, "\nNULL RECORD\n");
+	return;
+    }
+
+    fprintf(tfp, "\nGroup %s:\n",
+	    (group_def->group_name ? group_def->group_name : "NULL"));
+
+    print_item_list(group_def->item_list);
+    fprintf(tfp, "\n");
+}
+
+#if 0
+static void print_group_def_list(GroupDefList *group_list)
+{
+    GroupDefList *cur = group_list;
+    GroupDef *group_def;
+
+    while (NULL != (group_def = (GroupDef *) HTList_nextObject(cur)))
+	HTAA_printGroupDef(group_def);
+}
+
+/*
+ * IP address template matching
+ */
+
+/* static						part_match()
+ *		MATCH ONE PART OF INET ADDRESS AGAIST
+ *		A PART OF MASK (inet address has 4 parts)
+ * ON ENTRY:
+ *	tcur	pointer to the beginning of template part.
+ *	icur	pointer to the beginning of actual inet
+ *		number part.
+ *
+ * ON EXIT:
+ *	returns	YES, if match.
+ */
+static BOOL part_match(const char *tcur,
+		       const char *icur)
+{
+    char required[4];
+    char actual[4];
+    const char *cur;
+    int cnt;
+    BOOL status;
+
+    if (!tcur || !icur)
+	return NO;
+
+    cur = tcur;
+    cnt = 0;
+    while (cnt < 3 && *cur && *cur != '.')
+	required[cnt++] = *(cur++);
+    required[cnt] = (char) 0;
+
+    cur = icur;
+    cnt = 0;
+    while (cnt < 3 && *cur && *cur != '.')
+	actual[cnt++] = *(cur++);
+    actual[cnt] = (char) 0;
+
+    status = HTAA_templateMatch(required, actual);
+    CTRACE((tfp, "part_match: req: '%s' act: '%s' match: %s\n",
+	    required, actual, (status ? "yes" : "no")));
+
+    return status;
+}
+
+/* static						ip_number_match()
+ *		MATCH INET NUMBER AGAINST AN INET NUMBER MASK
+ * ON ENTRY:
+ *	template	mask to match agaist, e.g., 128.141.*.*
+ *	the_inet_addr	actual inet address, e.g., 128.141.201.74
+ *
+ * ON EXIT:
+ *	returns		YES, if match;  NO, if not.
+ */
+static BOOL ip_number_match(const char *ctemplate,
+			    const char *the_inet_addr)
+{
+    const char *tcur = ctemplate;
+    const char *icur = the_inet_addr;
+    int cnt;
+
+    for (cnt = 0; cnt < 4; cnt++) {
+	if (!tcur || !icur || !part_match(tcur, icur))
+	    return NO;
+	if (NULL != (tcur = strchr(tcur, '.')))
+	    tcur++;
+	if (NULL != (icur = strchr(icur, '.')))
+	    icur++;
+    }
+    return YES;
+}
+
+/* static						is_domain_mask()
+ *		DETERMINE IF A GIVEN MASK IS A
+ *		DOMAIN NAME MASK OR AN INET NUMBER MASK
+ * ON ENTRY:
+ *	mask	either a domain name mask,
+ *		e.g.
+ *			*.cern.ch
+ *
+ *		or an inet number mask,
+ *		e.g.
+ *			128.141.*.*
+ *
+ * ON EXIT:
+ *	returns	YES, if mask is a domain name mask.
+ *		NO, if it is an inet number mask.
+ */
+static BOOL is_domain_mask(const char *mask)
+{
+    const char *cur = mask;
+
+    if (!mask)
+	return NO;
+
+    while (*cur) {
+	if (*cur != '.' && *cur != '*' && (*cur < '0' || *cur > '9'))
+	    return YES;		/* Even one non-digit makes it a domain name mask */
+	cur++;
+    }
+    return NO;			/* All digits and dots, so it is an inet number mask */
+}
+
+/* static							ip_mask_match()
+ *		MATCH AN IP NUMBER MASK OR IP NAME MASK
+ *		AGAINST ACTUAL IP NUMBER OR IP NAME
+ *
+ * ON ENTRY:
+ *	mask		mask.  Mask may be either an inet number
+ *			mask or a domain name mask,
+ *			e.g.
+ *				128.141.*.*
+ *			or
+ *				*.cern.ch
+ *
+ *	ip_number	IP number of connecting host.
+ *	ip_name		IP name of the connecting host.
+ *
+ * ON EXIT:
+ *	returns		YES, if hostname/internet number
+ *			matches the mask.
+ *			NO, if no match (no fire).
+ */
+static BOOL ip_mask_match(const char *mask,
+			  const char *ip_number,
+			  const char *ip_name)
+{
+    if (mask && (ip_number || ip_name)) {
+	if (is_domain_mask(mask)) {
+	    if (HTAA_templateMatch(mask, ip_name))
+		return YES;
+	} else {
+	    if (ip_number_match(mask, ip_number))
+		return YES;
+	}
+    }
+    return NO;
+}
+
+static BOOL ip_in_def_list(AddressDefList *address_def_list,
+			   char *ip_number,
+			   char *ip_name)
+{
+    if (address_def_list && (ip_number || ip_name)) {
+	AddressDefList *cur = address_def_list;
+	Ref *ref;
+
+	while (NULL != (ref = (Ref *) HTList_nextObject(cur))) {
+	    /* Value of ref->translation is ignored, i.e., */
+	    /* no recursion for ip address tamplates.     */
+	    if (ip_mask_match(ref->name, ip_number, ip_name))
+		return YES;
+	}
+    }
+    return NO;
+}
+
+/*
+ * Group file cached reading
+ */
+
+typedef struct {
+    char *group_filename;
+    GroupDefList *group_list;
+} GroupCache;
+
+typedef HTList GroupCacheList;
+
+static GroupCacheList *group_cache_list = NULL;
+
+GroupDefList *HTAA_readGroupFile(const char *filename)
+{
+    FILE *fp;
+    GroupCache *group_cache;
+
+    if (isEmpty(filename))
+	return NULL;
+
+    if (!group_cache_list)
+	group_cache_list = HTList_new();
+    else {
+	GroupCacheList *cur = group_cache_list;
+
+	while (NULL != (group_cache = (GroupCache *) HTList_nextObject(cur))) {
+	    if (!strcmp(filename, group_cache->group_filename)) {
+		CTRACE((tfp, "%s '%s' %s\n",
+			"HTAA_readGroupFile: group file",
+			filename, "already found in cache"));
+		return group_cache->group_list;
+	    }			/* if cache match */
+	}			/* while cached files remain */
+    }				/* cache exists */
+
+    CTRACE((tfp, "HTAA_readGroupFile: reading group file `%s'\n",
+	    filename));
+
+    if (!(fp = fopen(filename, TXT_R))) {
+	CTRACE((tfp, "%s '%s'\n",
+		"HTAA_readGroupFile: unable to open group file",
+		filename));
+	return NULL;
+    }
+
+    if ((group_cache = typecalloc(GroupCache)) == 0)
+	outofmem(__FILE__, "HTAA_readGroupFile");
+
+    group_cache->group_filename = NULL;
+    StrAllocCopy(group_cache->group_filename, filename);
+    group_cache->group_list = parse_group_file(fp);
+    HTList_addObject(group_cache_list, (void *) group_cache);
+    fclose(fp);
+
+    CTRACE((tfp, "Read group file '%s', results follow:\n", filename));
+    if (TRACE)
+	print_group_def_list(group_cache->group_list);
+
+    return group_cache->group_list;
+}
+
+/* PUBLIC					HTAA_userAndInetInGroup()
+ *		CHECK IF USER BELONGS TO TO A GIVEN GROUP
+ *		AND THAT THE CONNECTION COMES FROM AN
+ *		ADDRESS THAT IS ALLOWED BY THAT GROUP
+ * ON ENTRY:
+ *	group		the group definition structure.
+ *	username	connecting user.
+ *	ip_number	browser host IP number, optional.
+ *	ip_name		browser host IP name, optional.
+ *			However, one of ip_number or ip_name
+ *			must be given.
+ * ON EXIT:
+ *	returns		HTAA_IP_MASK, if IP address mask was
+ *			reason for failing.
+ *			HTAA_NOT_MEMBER, if user does not belong
+ *			to the group.
+ *			HTAA_OK if both IP address and user are ok.
+ */
+HTAAFailReasonType HTAA_userAndInetInGroup(GroupDef *group,
+					   char *username,
+					   char *ip_number,
+					   char *ip_name)
+{
+    HTAAFailReasonType reason = HTAA_NOT_MEMBER;
+
+    if (group && username) {
+	ItemList *cur1 = group->item_list;
+	Item *item;
+
+	while (NULL != (item = (Item *) HTList_nextObject(cur1))) {
+	    if (!item->address_def_list ||	/* Any address allowed */
+		ip_in_def_list(item->address_def_list, ip_number, ip_name)) {
+
+		if (!item->user_def_list)	/* Any user allowed */
+		    return HTAA_OK;
+		else {
+		    UserDefList *cur2 = item->user_def_list;
+		    Ref *ref;
+
+		    while (NULL != (ref = (Ref *) HTList_nextObject(cur2))) {
+
+			if (ref->translation) {		/* Group, check recursively */
+			    reason = HTAA_userAndInetInGroup(ref->translation,
+							     username,
+							     ip_number, ip_name);
+			    if (reason == HTAA_OK)
+				return HTAA_OK;
+			} else {	/* Username, check directly */
+			    if (username && *username &&
+				0 == strcmp(ref->name, username))
+				return HTAA_OK;
+			}
+			/* Every user/group name in this group */
+		    }
+		    /* search for username */
+		}
+		/* IP address ok */
+	    } else {
+		reason = HTAA_IP_MASK;
+	    }
+	}			/* while items in group */
+    }
+    /* valid parameters */
+    return reason;		/* No match, or invalid parameters */
+}
+
+void GroupDef_delete(GroupDef *group_def)
+{
+    if (group_def) {
+	FREE(group_def->group_name);
+	if (group_def->item_list) {
+	    HTList_delete(group_def->item_list);	/* @@@@ */
+	    group_def->item_list = NULL;
+	}
+	FREE(group_def);
+    }
+}
+#endif