+++ /dev/null
-/*
- * Copyright (c) 2004-2005 Sergey Lyubka <valenok@gmail.com>
- * All rights reserved
- *
- * "THE BEER-WARE LICENSE" (Revision 42):
- * Sergey Lyubka wrote this file. As long as you retain this notice you
- * can do whatever you want with this stuff. If we meet some day, and you think
- * this stuff is worth it, you can buy me a beer in return.
- */
-
-#include "defs.h"
-
-#if !defined(NO_AUTH)
-/*
- * Stringify binary data. Output buffer must be twice as big as input,
- * because each byte takes 2 bytes in string representation
- */
-static void
-bin2str(char *to, const unsigned char *p, size_t len)
-{
- const char *hex = "0123456789abcdef";
-
- for (;len--; p++) {
- *to++ = hex[p[0] >> 4];
- *to++ = hex[p[0] & 0x0f];
- }
-}
-
-/*
- * Return stringified MD5 hash for list of vectors.
- * buf must point to at least 32-bytes long buffer
- */
-static void
-md5(char *buf, ...)
-{
- unsigned char hash[16];
- const struct vec *v;
- va_list ap;
- MD5_CTX ctx;
- int i;
-
- MD5Init(&ctx);
-
- va_start(ap, buf);
- for (i = 0; (v = va_arg(ap, const struct vec *)) != NULL; i++) {
- assert(v->len >= 0);
- if (v->len == 0)
- continue;
- if (i > 0)
- MD5Update(&ctx, (unsigned char *) ":", 1);
- MD5Update(&ctx,(unsigned char *)v->ptr,(unsigned int)v->len);
- }
- va_end(ap);
-
- MD5Final(hash, &ctx);
- bin2str(buf, hash, sizeof(hash));
-}
-
-/*
- * Compare to vectors. Return 1 if they are equal
- */
-static int
-vcmp(const struct vec *v1, const struct vec *v2)
-{
- return (v1->len == v2->len && !memcmp(v1->ptr, v2->ptr, v1->len));
-}
-
-struct digest {
- struct vec user;
- struct vec uri;
- struct vec nonce;
- struct vec cnonce;
- struct vec resp;
- struct vec qop;
- struct vec nc;
-};
-
-static const struct auth_keyword {
- size_t offset;
- struct vec vec;
-} known_auth_keywords[] = {
- {offsetof(struct digest, user), {"username=", 9}},
- {offsetof(struct digest, cnonce), {"cnonce=", 7}},
- {offsetof(struct digest, resp), {"response=", 9}},
- {offsetof(struct digest, uri), {"uri=", 4}},
- {offsetof(struct digest, qop), {"qop=", 4}},
- {offsetof(struct digest, nc), {"nc=", 3}},
- {offsetof(struct digest, nonce), {"nonce=", 6}},
- {0, {NULL, 0}}
-};
-
-static void
-parse_authorization_header(const struct vec *h, struct digest *dig)
-{
- const unsigned char *p, *e, *s;
- struct vec *v, vec;
- const struct auth_keyword *kw;
-
- (void) memset(dig, 0, sizeof(*dig));
- p = (unsigned char *) h->ptr + 7;
- e = (unsigned char *) h->ptr + h->len;
-
- while (p < e) {
-
- /* Skip spaces */
- while (p < e && (*p == ' ' || *p == ','))
- p++;
-
- /* Skip to "=" */
- for (s = p; s < e && *s != '='; )
- s++;
- s++;
-
- /* Is it known keyword ? */
- for (kw = known_auth_keywords; kw->vec.len > 0; kw++)
- if (kw->vec.len <= s - p &&
- !memcmp(p, kw->vec.ptr, kw->vec.len))
- break;
-
- if (kw->vec.len == 0)
- v = &vec; /* Dummy placeholder */
- else
- v = (struct vec *) ((char *) dig + kw->offset);
-
- if (*s == '"') {
- p = ++s;
- while (p < e && *p != '"')
- p++;
- } else {
- p = s;
- while (p < e && *p != ' ' && *p != ',')
- p++;
- }
-
- v->ptr = (char *) s;
- v->len = p - s;
-
- if (*p == '"')
- p++;
-
- DBG(("auth field [%.*s]", v->len, v->ptr));
- }
-}
-
-/*
- * Check the user's password, return 1 if OK
- */
-static int
-check_password(int method, const struct vec *ha1, const struct digest *digest)
-{
- char a2[32], resp[32];
- struct vec vec_a2;
-
- /* XXX Due to a bug in MSIE, we do not compare the URI */
- /* Also, we do not check for authentication timeout */
- if (/*strcmp(dig->uri, c->ouri) != 0 || */
- digest->resp.len != 32 /*||
- now - strtoul(dig->nonce, NULL, 10) > 3600 */)
- return (0);
-
- md5(a2, &known_http_methods[method], &digest->uri, NULL);
- vec_a2.ptr = a2;
- vec_a2.len = sizeof(a2);
- md5(resp, ha1, &digest->nonce, &digest->nc,
- &digest->cnonce, &digest->qop, &vec_a2, NULL);
-
- return (!memcmp(resp, digest->resp.ptr, 32));
-}
-
-static FILE *
-open_auth_file(struct shttpd_ctx *ctx, const char *path)
-{
- char name[FILENAME_MAX];
- const char *p, *e;
- FILE *fp = NULL;
- int fd;
-
- if (ctx->options[OPT_AUTH_GPASSWD] != NULL) {
- /* Use global passwords file */
- my_snprintf(name, sizeof(name), "%s",
- ctx->options[OPT_AUTH_GPASSWD]);
- } else {
- /* Try to find .htpasswd in requested directory */
- for (p = path, e = p + strlen(p) - 1; e > p; e--)
- if (IS_DIRSEP_CHAR(*e))
- break;
-
- assert(IS_DIRSEP_CHAR(*e));
- (void) my_snprintf(name, sizeof(name), "%.*s/%s",
- (int) (e - p), p, HTPASSWD);
- }
-
- if ((fd = my_open(name, O_RDONLY, 0)) == -1) {
- DBG(("open_auth_file: open(%s)", name));
- } else if ((fp = fdopen(fd, "r")) == NULL) {
- DBG(("open_auth_file: fdopen(%s)", name));
- (void) close(fd);
- }
-
- return (fp);
-}
-
-/*
- * Parse the line from htpasswd file. Line should be in form of
- * "user:domain:ha1". Fill in the vector values. Return 1 if successful.
- */
-static int
-parse_htpasswd_line(const char *s, struct vec *user,
- struct vec *domain, struct vec *ha1)
-{
- user->len = domain->len = ha1->len = 0;
-
- for (user->ptr = s; *s != '\0' && *s != ':'; s++, user->len++);
- if (*s++ != ':')
- return (0);
-
- for (domain->ptr = s; *s != '\0' && *s != ':'; s++, domain->len++);
- if (*s++ != ':')
- return (0);
-
- for (ha1->ptr = s; *s != '\0' && !isspace(* (unsigned char *) s);
- s++, ha1->len++);
-
- DBG(("parse_htpasswd_line: [%.*s] [%.*s] [%.*s]", user->len, user->ptr,
- domain->len, domain->ptr, ha1->len, ha1->ptr));
-
- return (user->len > 0 && domain->len > 0 && ha1->len > 0);
-}
-
-/*
- * Authorize against the opened passwords file. Return 1 if authorized.
- */
-static int
-authorize(struct conn *c, FILE *fp)
-{
- struct vec *auth_vec = &c->ch.auth.v_vec;
- struct vec *user_vec = &c->ch.user.v_vec;
- struct vec user, domain, ha1;
- struct digest digest;
- int ok = 0;
- char line[256];
-
- if (auth_vec->len > 20 &&
- !my_strncasecmp(auth_vec->ptr, "Digest ", 7)) {
-
- parse_authorization_header(auth_vec, &digest);
- *user_vec = digest.user;
-
- while (fgets(line, sizeof(line), fp) != NULL) {
-
- if (!parse_htpasswd_line(line, &user, &domain, &ha1))
- continue;
-
- DBG(("[%.*s] [%.*s] [%.*s]", user.len, user.ptr,
- domain.len, domain.ptr, ha1.len, ha1.ptr));
-
- if (vcmp(user_vec, &user) &&
- !memcmp(c->ctx->options[OPT_AUTH_REALM],
- domain.ptr, domain.len)) {
- ok = check_password(c->method, &ha1, &digest);
- break;
- }
- }
- }
-
- return (ok);
-}
-
-int
-check_authorization(struct conn *c, const char *path)
-{
- FILE *fp = NULL;
- int len, n, authorized = 1;
- const char *p, *s = c->ctx->options[OPT_PROTECT];
- char protected_path[FILENAME_MAX];
-
- FOR_EACH_WORD_IN_LIST(s, len) {
-
- if ((p = memchr(s, '=', len)) == NULL || p >= s + len || p == s)
- continue;
-
- if (!memcmp(c->uri, s, p - s)) {
-
- n = s + len - p + 1;
- if (n > (int) sizeof(protected_path) - 1)
- n = sizeof(protected_path) - 1;
-
- my_strlcpy(protected_path, p + 1, n);
-
- if ((fp = fopen(protected_path, "r")) == NULL)
- elog(E_LOG, c, "check_auth: cannot open %s: %s",
- protected_path, strerror(errno));
- break;
- }
- }
-
- if (fp == NULL)
- fp = open_auth_file(c->ctx, path);
-
- if (fp != NULL) {
- authorized = authorize(c, fp);
- (void) fclose(fp);
- }
-
- return (authorized);
-}
-
-int
-is_authorized_for_put(struct conn *c)
-{
- FILE *fp;
- int ret = 0;
-
- if ((fp = fopen(c->ctx->options[OPT_AUTH_PUT], "r")) != NULL) {
- ret = authorize(c, fp);
- (void) fclose(fp);
- }
-
- return (ret);
-}
-
-void
-send_authorization_request(struct conn *c)
-{
- char buf[512];
-
- (void) my_snprintf(buf, sizeof(buf), "Unauthorized\r\n"
- "WWW-Authenticate: Digest qop=\"auth\", realm=\"%s\", "
- "nonce=\"%lu\"", c->ctx->options[OPT_AUTH_REALM],
- (unsigned long) current_time);
-
- send_server_error(c, 401, buf);
-}
-
-/*
- * Edit the passwords file.
- */
-int
-edit_passwords(const char *fname, const char *domain,
- const char *user, const char *pass)
-{
- int ret = EXIT_SUCCESS, found = 0;
- struct vec u, d, p;
- char line[512], tmp[FILENAME_MAX], ha1[32];
- FILE *fp = NULL, *fp2 = NULL;
-
- (void) my_snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
-
- /* Create the file if does not exist */
- if ((fp = fopen(fname, "a+")))
- (void) fclose(fp);
-
- /* Open the given file and temporary file */
- if ((fp = fopen(fname, "r")) == NULL)
- elog(E_FATAL, 0, "Cannot open %s: %s", fname, strerror(errno));
- else if ((fp2 = fopen(tmp, "w+")) == NULL)
- elog(E_FATAL, 0, "Cannot open %s: %s", tmp, strerror(errno));
-
- p.ptr = pass;
- p.len = strlen(pass);
-
- /* Copy the stuff to temporary file */
- while (fgets(line, sizeof(line), fp) != NULL) {
- u.ptr = line;
- if ((d.ptr = strchr(line, ':')) == NULL)
- continue;
- u.len = d.ptr - u.ptr;
- d.ptr++;
- if (strchr(d.ptr, ':') == NULL)
- continue;
- d.len = strchr(d.ptr, ':') - d.ptr;
-
- if ((int) strlen(user) == u.len &&
- !memcmp(user, u.ptr, u.len) &&
- (int) strlen(domain) == d.len &&
- !memcmp(domain, d.ptr, d.len)) {
- found++;
- md5(ha1, &u, &d, &p, NULL);
- (void) fprintf(fp2, "%s:%s:%.32s\n", user, domain, ha1);
- } else {
- (void) fprintf(fp2, "%s", line);
- }
- }
-
- /* If new user, just add it */
- if (found == 0) {
- u.ptr = user; u.len = strlen(user);
- d.ptr = domain; d.len = strlen(domain);
- md5(ha1, &u, &d, &p, NULL);
- (void) fprintf(fp2, "%s:%s:%.32s\n", user, domain, ha1);
- }
-
- /* Close files */
- (void) fclose(fp);
- (void) fclose(fp2);
-
- /* Put the temp file in place of real file */
- (void) my_remove(fname);
- (void) my_rename(tmp, fname);
-
- return (ret);
-}
-#endif /* NO_AUTH */
projects / fms.git / blobdiff