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+/*
+ * $LynxId: HTAAUtil.c,v 1.36 2016/11/24 15:29:50 tom Exp $
+ *
+ * MODULE HTAAUtil.c
+ * COMMON PARTS OF ACCESS AUTHORIZATION MODULE
+ * FOR BOTH SERVER AND BROWSER
+ *
+ * IMPORTANT:
+ * Routines in this module use dynamic allocation, but free
+ * automatically all the memory reserved by them.
+ *
+ * Therefore the caller never has to (and never should)
+ * free() any object returned by these functions.
+ *
+ * Therefore also all the strings returned by this package
+ * are only valid until the next call to the same function
+ * is made. This approach is selected, because of the nature
+ * of access authorization: no string returned by the package
+ * needs to be valid longer than until the next call.
+ *
+ * This also makes it easy to plug the AA package in:
+ * you don't have to ponder whether to free() something
+ * here or is it done somewhere else (because it is always
+ * done somewhere else).
+ *
+ * The strings that the package needs to store are copied
+ * so the original strings given as parameters to AA
+ * functions may be freed or modified with no side effects.
+ *
+ * The AA package does not free() anything else than what
+ * it has itself allocated.
+ *
+ * AA (Access Authorization) package means modules which
+ * names start with HTAA.
+ *
+ * AUTHORS:
+ * AL Ari Luotonen luotonen@dxcern.cern.ch
+ * MD Mark Donszelmann duns@vxdeop.cern.ch
+ *
+ * HISTORY:
+ * 8 Nov 93 MD (VMS only) Added case insensitive comparison in HTAA_templateCaseMatch
+ *
+ *
+ * BUGS:
+ *
+ *
+ */
+
+#include <HTUtils.h>
+
+#include <HTAAUtil.h> /* Implemented here */
+#include <HTAssoc.h> /* Assoc list */
+#include <HTTCP.h>
+#include <HTTP.h>
+
+#include <LYStrings.h>
+#include <LYUtils.h>
+#include <LYLeaks.h>
+
+/* PUBLIC HTAAScheme_enum()
+ * TRANSLATE SCHEME NAME INTO
+ * A SCHEME ENUMERATION
+ *
+ * ON ENTRY:
+ * name is a string representing the scheme name.
+ *
+ * ON EXIT:
+ * returns the enumerated constant for that scheme.
+ */
+HTAAScheme HTAAScheme_enum(const char *name)
+{
+ char *upcased = NULL;
+
+ if (!name)
+ return HTAA_UNKNOWN;
+
+ StrAllocCopy(upcased, name);
+ LYUpperCase(upcased);
+
+ if (!StrNCmp(upcased, "NONE", 4)) {
+ FREE(upcased);
+ return HTAA_NONE;
+ } else if (!StrNCmp(upcased, "BASIC", 5)) {
+ FREE(upcased);
+ return HTAA_BASIC;
+ } else if (!StrNCmp(upcased, "PUBKEY", 6)) {
+ FREE(upcased);
+ return HTAA_PUBKEY;
+ } else if (!StrNCmp(upcased, "KERBEROSV4", 10)) {
+ FREE(upcased);
+ return HTAA_KERBEROS_V4;
+ } else if (!StrNCmp(upcased, "KERBEROSV5", 10)) {
+ FREE(upcased);
+ return HTAA_KERBEROS_V5;
+ } else {
+ FREE(upcased);
+ return HTAA_UNKNOWN;
+ }
+}
+
+/* PUBLIC HTAAScheme_name()
+ * GET THE NAME OF A GIVEN SCHEME
+ * ON ENTRY:
+ * scheme is one of the scheme enum values:
+ * HTAA_NONE, HTAA_BASIC, HTAA_PUBKEY, ...
+ *
+ * ON EXIT:
+ * returns the name of the scheme, i.e.
+ * "None", "Basic", "Pubkey", ...
+ */
+const char *HTAAScheme_name(HTAAScheme scheme)
+{
+ switch (scheme) {
+ case HTAA_NONE:
+ return "None";
+ case HTAA_BASIC:
+ return "Basic";
+ case HTAA_PUBKEY:
+ return "Pubkey";
+ case HTAA_KERBEROS_V4:
+ return "KerberosV4";
+ case HTAA_KERBEROS_V5:
+ return "KerberosV5";
+ case HTAA_UNKNOWN:
+ return "UNKNOWN";
+ default:
+ return "THIS-IS-A-BUG";
+ }
+}
+
+/* PUBLIC HTAAMethod_enum()
+ * TRANSLATE METHOD NAME INTO AN ENUMERATED VALUE
+ * ON ENTRY:
+ * name is the method name to translate.
+ *
+ * ON EXIT:
+ * returns HTAAMethod enumerated value corresponding
+ * to the given name.
+ */
+HTAAMethod HTAAMethod_enum(const char *name)
+{
+ if (!name)
+ return METHOD_UNKNOWN;
+
+ if (0 == strcasecomp(name, "GET"))
+ return METHOD_GET;
+ else if (0 == strcasecomp(name, "PUT"))
+ return METHOD_PUT;
+ else
+ return METHOD_UNKNOWN;
+}
+
+/* PUBLIC HTAAMethod_name()
+ * GET THE NAME OF A GIVEN METHOD
+ * ON ENTRY:
+ * method is one of the method enum values:
+ * METHOD_GET, METHOD_PUT, ...
+ *
+ * ON EXIT:
+ * returns the name of the scheme, i.e.
+ * "GET", "PUT", ...
+ */
+const char *HTAAMethod_name(HTAAMethod method)
+{
+ switch (method) {
+ case METHOD_GET:
+ return "GET";
+ case METHOD_PUT:
+ return "PUT";
+ case METHOD_UNKNOWN:
+ return "UNKNOWN";
+ default:
+ return "THIS-IS-A-BUG";
+ }
+}
+
+/* PUBLIC HTAAMethod_inList()
+ * IS A METHOD IN A LIST OF METHOD NAMES
+ * ON ENTRY:
+ * method is the method to look for.
+ * list is a list of method names.
+ *
+ * ON EXIT:
+ * returns YES, if method was found.
+ * NO, if not found.
+ */
+BOOL HTAAMethod_inList(HTAAMethod method, HTList *list)
+{
+ HTList *cur = list;
+ char *item;
+
+ while (NULL != (item = (char *) HTList_nextObject(cur))) {
+ CTRACE((tfp, " %s", item));
+ if (method == HTAAMethod_enum(item))
+ return YES;
+ }
+
+ return NO; /* Not found */
+}
+
+/* PUBLIC HTAA_templateMatch()
+ * STRING COMPARISON FUNCTION FOR FILE NAMES
+ * WITH ONE WILDCARD * IN THE TEMPLATE
+ * NOTE:
+ * This is essentially the same code as in HTRules.c, but it
+ * cannot be used because it is embedded in between other code.
+ * (In fact, HTRules.c should use this routine, but then this
+ * routine would have to be more sophisticated... why is life
+ * sometimes so hard...)
+ *
+ * ON ENTRY:
+ * ctemplate is a template string to match the file name
+ * against, may contain a single wildcard
+ * character * which matches zero or more
+ * arbitrary characters.
+ * filename is the filename (or pathname) to be matched
+ * against the template.
+ *
+ * ON EXIT:
+ * returns YES, if filename matches the template.
+ * NO, otherwise.
+ */
+BOOL HTAA_templateMatch(const char *ctemplate,
+ const char *filename)
+{
+ const char *p = ctemplate;
+ const char *q = filename;
+ int m;
+
+ for (; *p && *q && *p == *q; p++, q++) /* Find first mismatch */
+ ; /* do nothing else */
+
+ if (!*p && !*q)
+ return YES; /* Equally long equal strings */
+ else if ('*' == *p) { /* Wildcard */
+ p++; /* Skip wildcard character */
+ m = (int) (strlen(q) - strlen(p)); /* Amount to match to wildcard */
+ if (m < 0)
+ return NO; /* No match, filename too short */
+ else { /* Skip the matched characters and compare */
+ if (strcmp(p, q + m))
+ return NO; /* Tail mismatch */
+ else
+ return YES; /* Tail match */
+ }
+ /* if wildcard */
+ } else
+ return NO; /* Length or character mismatch */
+}
+
+/* PUBLIC HTAA_templateCaseMatch()
+ * STRING COMPARISON FUNCTION FOR FILE NAMES
+ * WITH ONE WILDCARD * IN THE TEMPLATE (Case Insensitive)
+ * NOTE:
+ * This is essentially the same code as in HTAA_templateMatch, but
+ * it compares case insensitive (for VMS). Reason for this routine
+ * is that HTAA_templateMatch gets called from several places, also
+ * there where a case sensitive match is needed, so one cannot just
+ * change the HTAA_templateMatch routine for VMS.
+ *
+ * ON ENTRY:
+ * template is a template string to match the file name
+ * against, may contain a single wildcard
+ * character * which matches zero or more
+ * arbitrary characters.
+ * filename is the filename (or pathname) to be matched
+ * against the template.
+ *
+ * ON EXIT:
+ * returns YES, if filename matches the template.
+ * NO, otherwise.
+ */
+BOOL HTAA_templateCaseMatch(const char *ctemplate,
+ const char *filename)
+{
+ const char *p = ctemplate;
+ const char *q = filename;
+ int m;
+
+ /* Find first mismatch */
+ for (; *p && *q && TOUPPER(*p) == TOUPPER(*q); p++, q++) ; /* do nothing else */
+
+ if (!*p && !*q)
+ return YES; /* Equally long equal strings */
+ else if ('*' == *p) { /* Wildcard */
+ p++; /* Skip wildcard character */
+ m = (int) (strlen(q) - strlen(p)); /* Amount to match to wildcard */
+ if (m < 0)
+ return NO; /* No match, filename too short */
+ else { /* Skip the matched characters and compare */
+ if (strcasecomp(p, q + m))
+ return NO; /* Tail mismatch */
+ else
+ return YES; /* Tail match */
+ }
+ /* if wildcard */
+ } else
+ return NO; /* Length or character mismatch */
+}
+
+/* PUBLIC HTAA_makeProtectionTemplate()
+ * CREATE A PROTECTION TEMPLATE FOR THE FILES
+ * IN THE SAME DIRECTORY AS THE GIVEN FILE
+ * (Used by server if there is no fancier way for
+ * it to tell the client, and by browser if server
+ * didn't send WWW-ProtectionTemplate: field)
+ * ON ENTRY:
+ * docname is the document pathname (from URL).
+ *
+ * ON EXIT:
+ * returns a template matching docname, and other files
+ * files in that directory.
+ *
+ * E.g. /foo/bar/x.html => /foo/bar/ *
+ * ^
+ * Space only to prevent it from
+ * being a comment marker here,
+ * there really isn't any space.
+ */
+char *HTAA_makeProtectionTemplate(const char *docname)
+{
+ char *ctemplate = NULL;
+ char *slash = NULL;
+
+ if (docname) {
+ StrAllocCopy(ctemplate, docname);
+ slash = strrchr(ctemplate, '/');
+ if (slash)
+ slash++;
+ else
+ slash = ctemplate;
+ *slash = '\0';
+ StrAllocCat(ctemplate, "*");
+ } else
+ StrAllocCopy(ctemplate, "*");
+
+ CTRACE((tfp, "make_template: made template `%s' for file `%s'\n",
+ ctemplate, docname));
+
+ return ctemplate;
+}
+
+/*
+ * Skip leading whitespace from *s forward
+ */
+#define SKIPWS(s) while (*s==' ' || *s=='\t') s++;
+
+/*
+ * Kill trailing whitespace starting from *(s-1) backwards
+ */
+#define KILLWS(s) {char *c=s-1; while (*c==' ' || *c=='\t') *(c--)='\0';}
+
+/* PUBLIC HTAA_parseArgList()
+ * PARSE AN ARGUMENT LIST GIVEN IN A HEADER FIELD
+ * ON ENTRY:
+ * str is a comma-separated list:
+ *
+ * item, item, item
+ * where
+ * item ::= value
+ * | name=value
+ * | name="value"
+ *
+ * Leading and trailing whitespace is ignored
+ * everywhere except inside quotes, so the following
+ * examples are equal:
+ *
+ * name=value,foo=bar
+ * name="value",foo="bar"
+ * name = value , foo = bar
+ * name = "value" , foo = "bar"
+ *
+ * ON EXIT:
+ * returns a list of name-value pairs (actually HTAssocList*).
+ * For items with no name, just value, the name is
+ * the number of order number of that item. E.g.
+ * "1" for the first, etc.
+ */
+HTAssocList *HTAA_parseArgList(char *str)
+{
+ HTAssocList *assoc_list = HTAssocList_new();
+ char *cur = NULL;
+ char *name = NULL;
+ int n = 0;
+
+ if (!str)
+ return assoc_list;
+
+ while (*str) {
+ SKIPWS(str); /* Skip leading whitespace */
+ cur = str;
+ n++;
+
+ while (*cur && *cur != '=' && *cur != ',')
+ cur++; /* Find end of name (or lonely value without a name) */
+ KILLWS(cur); /* Kill trailing whitespace */
+
+ if (*cur == '=') { /* Name followed by a value */
+ *(cur++) = '\0'; /* Terminate name */
+ StrAllocCopy(name, str);
+ SKIPWS(cur); /* Skip WS leading the value */
+ str = cur;
+ if (*str == '"') { /* Quoted value */
+ str++;
+ cur = str;
+ while (*cur && *cur != '"')
+ cur++;
+ if (*cur == '"')
+ *(cur++) = '\0'; /* Terminate value */
+ /* else it is lacking terminating quote */
+ SKIPWS(cur); /* Skip WS leading comma */
+ if (*cur == ',')
+ cur++; /* Skip separating colon */
+ } else { /* Unquoted value */
+ while (*cur && *cur != ',')
+ cur++;
+ KILLWS(cur); /* Kill trailing whitespace */
+ if (*cur == ',')
+ *(cur++) = '\0';
+ /* else *cur already NULL */
+ }
+ } else { /* No name, just a value */
+ if (*cur == ',')
+ *(cur++) = '\0'; /* Terminate value */
+ /* else last value on line (already terminated by NULL) */
+ HTSprintf0(&name, "%d", n); /* Item order number for name */
+ }
+ HTAssocList_add(assoc_list, name, str);
+ str = cur;
+ } /* while *str */
+
+ FREE(name);
+ return assoc_list;
+}
+
+/************** HEADER LINE READER -- DOES UNFOLDING *************************/
+
+#define BUFFER_SIZE 1024
+
+static size_t buffer_length;
+static char *buffer = 0;
+static char *start_pointer;
+static char *end_pointer;
+static int in_soc = -1;
+
+#ifdef LY_FIND_LEAKS
+static void FreeHTAAUtil(void)
+{
+ FREE(buffer);
+}
+#endif /* LY_FIND_LEAKS */
+
+/* PUBLIC HTAA_setupReader()
+ * SET UP HEADER LINE READER, i.e., give
+ * the already-read-but-not-yet-processed
+ * buffer of text to be read before more
+ * is read from the socket.
+ * ON ENTRY:
+ * start_of_headers is a pointer to a buffer containing
+ * the beginning of the header lines
+ * (rest will be read from a socket).
+ * length is the number of valid characters in
+ * 'start_of_headers' buffer.
+ * soc is the socket to use when start_of_headers
+ * buffer is used up.
+ * ON EXIT:
+ * returns nothing.
+ * Subsequent calls to HTAA_getUnfoldedLine()
+ * will use this buffer first and then
+ * proceed to read from socket.
+ */
+void HTAA_setupReader(char *start_of_headers,
+ size_t length,
+ int soc)
+{
+ if (!start_of_headers)
+ length = 0; /* initialize length (is this reached at all?) */
+ if (buffer == NULL) { /* first call? */
+ buffer_length = length;
+ if (buffer_length < BUFFER_SIZE) /* would fall below BUFFER_SIZE? */
+ buffer_length = BUFFER_SIZE;
+ buffer = (char *) malloc((size_t) (sizeof(char) * (buffer_length + 1)));
+ } else if (length > buffer_length) { /* need more space? */
+ buffer_length = length;
+ buffer = (char *) realloc((char *) buffer,
+ (size_t) (sizeof(char) * (buffer_length + 1)));
+ }
+ if (buffer == NULL)
+ outofmem(__FILE__, "HTAA_setupReader");
+
+#ifdef LY_FIND_LEAKS
+ atexit(FreeHTAAUtil);
+#endif
+ start_pointer = buffer;
+ if (start_of_headers) {
+ LYStrNCpy(buffer, start_of_headers, length);
+ end_pointer = buffer + length;
+ } else {
+ *start_pointer = '\0';
+ end_pointer = start_pointer;
+ }
+ in_soc = soc;
+}
+
+/* PUBLIC HTAA_getUnfoldedLine()
+ * READ AN UNFOLDED HEADER LINE FROM SOCKET
+ * ON ENTRY:
+ * HTAA_setupReader must absolutely be called before
+ * this function to set up internal buffer.
+ *
+ * ON EXIT:
+ * returns a newly-allocated character string representing
+ * the read line. The line is unfolded, i.e.
+ * lines that begin with whitespace are appended
+ * to current line. E.g.
+ *
+ * Field-Name: Blaa-Blaa
+ * This-Is-A-Continuation-Line
+ * Here-Is_Another
+ *
+ * is seen by the caller as:
+ *
+ * Field-Name: Blaa-Blaa This-Is-A-Continuation-Line Here-Is_Another
+ *
+ */
+char *HTAA_getUnfoldedLine(void)
+{
+ char *line = NULL;
+ char *cur;
+ int count;
+ BOOL peek_for_folding = NO;
+
+ if (in_soc < 0) {
+ CTRACE((tfp, "%s %s\n",
+ "HTAA_getUnfoldedLine: buffer not initialized",
+ "with function HTAA_setupReader()"));
+ return NULL;
+ }
+
+ for (;;) {
+
+ /* Reading from socket */
+
+ if (start_pointer >= end_pointer) { /*Read the next block and continue */
+#ifdef USE_SSL
+ if (SSL_handle)
+ count = SSL_read(SSL_handle, buffer, BUFFER_SIZE);
+ else
+ count = NETREAD(in_soc, buffer, BUFFER_SIZE);
+#else
+ count = NETREAD(in_soc, buffer, BUFFER_SIZE);
+#endif /* USE_SSL */
+ if (count <= 0) {
+ in_soc = -1;
+ return line;
+ }
+ if (count > (int) buffer_length)
+ count = (int) buffer_length;
+ start_pointer = buffer;
+ end_pointer = buffer + count;
+ *end_pointer = '\0';
+#ifdef NOT_ASCII
+ cur = start_pointer;
+ while (cur < end_pointer) {
+ *cur = TOASCII(*cur);
+ cur++;
+ }
+#endif /*NOT_ASCII */
+ }
+ cur = start_pointer;
+
+ /* Unfolding */
+
+ if (peek_for_folding) {
+ if (*cur != ' ' && *cur != '\t')
+ return line; /* Ok, no continuation line */
+ else /* So this is a continuation line, continue */
+ peek_for_folding = NO;
+ }
+
+ /* Finding end-of-line */
+
+ while (cur < end_pointer && *cur != '\n') /* Find the end-of-line */
+ cur++; /* (or end-of-buffer). */
+
+ /* Terminating line */
+
+ if (cur < end_pointer) { /* So *cur==LF, terminate line */
+ *cur = '\0'; /* Overwrite LF */
+ if (*(cur - 1) == '\r')
+ *(cur - 1) = '\0'; /* Overwrite CR */
+ peek_for_folding = YES; /* Check for a continuation line */
+ }
+
+ /* Copying the result */
+
+ if (line)
+ StrAllocCat(line, start_pointer); /* Append */
+ else
+ StrAllocCopy(line, start_pointer); /* A new line */
+
+ start_pointer = cur + 1; /* Skip the read line */
+
+ } /* forever */
+}
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