diff options
Diffstat (limited to 'data/lighttpd/lighttpd-1.4.53/src/burl.c')
-rw-r--r-- | data/lighttpd/lighttpd-1.4.53/src/burl.c | 512 |
1 files changed, 512 insertions, 0 deletions
diff --git a/data/lighttpd/lighttpd-1.4.53/src/burl.c b/data/lighttpd/lighttpd-1.4.53/src/burl.c new file mode 100644 index 000000000..511826286 --- /dev/null +++ b/data/lighttpd/lighttpd-1.4.53/src/burl.c @@ -0,0 +1,512 @@ +#include "first.h" +#include "burl.h" + +#include <string.h> + +#include "buffer.h" +#include "base64.h" + +static const char hex_chars_uc[] = "0123456789ABCDEF"; + +/* everything except: ! $ & ' ( ) * + , - . / 0-9 : ; = ? @ A-Z _ a-z ~ */ +static const char encoded_chars_http_uri_reqd[] = { + /* + 0 1 2 3 4 5 6 7 8 9 A B C D E F + */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 00 - 0F control chars */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 10 - 1F */ + 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 20 - 2F space " # % */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, /* 30 - 3F < > */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 40 - 4F */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, /* 50 - 5F [ \ ] ^ */ + 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 60 - 6F ` */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, /* 70 - 7F { | } DEL */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 80 - 8F */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 90 - 9F */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* A0 - AF */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* B0 - BF */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* C0 - CF */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* D0 - DF */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* E0 - EF */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* F0 - FF */ +}; + + +/* c (char) and n (nibble) MUST be unsigned integer types */ +#define li_cton(c,n) \ + (((n) = (c) - '0') <= 9 || (((n) = ((c)&0xdf) - 'A') <= 5 ? ((n) += 10) : 0)) + +/* b (byte) MUST be unsigned integer type + * https://en.wikipedia.org/wiki/UTF-8 + * reject overlong encodings of 7-byte ASCII and invalid UTF-8 + * (but does not detect other overlong multi-byte encodings) */ +#define li_utf8_invalid_byte(b) ((b) >= 0xF5 || ((b)|0x1) == 0xC1) + + +static int burl_is_unreserved (const int c) +{ + return (light_isalnum(c) || c == '-' || c == '.' || c == '_' || c == '~'); +} + + +static int burl_normalize_basic_unreserved_fix (buffer *b, buffer *t, int i, int qs) +{ + int j = i; + const int used = (int)buffer_string_length(b); + const unsigned char * const s = (unsigned char *)b->ptr; + unsigned char * const p = + (unsigned char *)buffer_string_prepare_copy(t,i+(used-i)*3+1); + unsigned int n1, n2; + memcpy(p, s, (size_t)i); + for (; i < used; ++i, ++j) { + if (!encoded_chars_http_uri_reqd[s[i]]) { + if (s[i] == '?' && -1 == qs) qs = j; + p[j] = s[i]; + } + else if (s[i]=='%' && li_cton(s[i+1], n1) && li_cton(s[i+2], n2)) { + const unsigned int x = (n1 << 4) | n2; + if (burl_is_unreserved(x)) { + p[j] = x; + } + else { + p[j] = '%'; + p[++j] = hex_chars_uc[n1]; /*(s[i+1] & 0xdf)*/ + p[++j] = hex_chars_uc[n2]; /*(s[i+2] & 0xdf)*/ + if (li_utf8_invalid_byte(x)) qs = -2; + } + i+=2; + } + else if (s[i] == '#') break; /* ignore fragment */ + else { + p[j] = '%'; + p[++j] = hex_chars_uc[(s[i] >> 4) & 0xF]; + p[++j] = hex_chars_uc[s[i] & 0xF]; + if (li_utf8_invalid_byte(s[i])) qs = -2; + } + } + buffer_commit(t, (size_t)j); + buffer_copy_buffer(b, t); + return qs; +} + + +static int burl_normalize_basic_unreserved (buffer *b, buffer *t) +{ + const unsigned char * const s = (unsigned char *)b->ptr; + const int used = (int)buffer_string_length(b); + unsigned int n1, n2, x; + int qs = -1; + + for (int i = 0; i < used; ++i) { + if (!encoded_chars_http_uri_reqd[s[i]]) { + if (s[i] == '?' && -1 == qs) qs = i; + } + else if (s[i]=='%' && li_cton(s[i+1], n1) && li_cton(s[i+2], n2) + && !burl_is_unreserved((x = (n1 << 4) | n2))) { + if (li_utf8_invalid_byte(x)) qs = -2; + if (s[i+1] >= 'a') b->ptr[i+1] &= 0xdf; /* uppercase hex */ + if (s[i+2] >= 'a') b->ptr[i+2] &= 0xdf; /* uppercase hex */ + i+=2; + } + else if (s[i] == '#') { /* ignore fragment */ + buffer_string_set_length(b, (size_t)i); + break; + } + else { + qs = burl_normalize_basic_unreserved_fix(b, t, i, qs); + break; + } + } + + return qs; +} + + +static int burl_normalize_basic_required_fix (buffer *b, buffer *t, int i, int qs) +{ + int j = i; + const int used = (int)buffer_string_length(b); + const unsigned char * const s = (unsigned char *)b->ptr; + unsigned char * const p = + (unsigned char *)buffer_string_prepare_copy(t,i+(used-i)*3+1); + unsigned int n1, n2; + memcpy(p, s, (size_t)i); + for (; i < used; ++i, ++j) { + if (!encoded_chars_http_uri_reqd[s[i]]) { + if (s[i] == '?' && -1 == qs) qs = j; + p[j] = s[i]; + } + else if (s[i]=='%' && li_cton(s[i+1], n1) && li_cton(s[i+2], n2)) { + const unsigned int x = (n1 << 4) | n2; + if (!encoded_chars_http_uri_reqd[x] + && (qs < 0 ? (x!='/'&&x!='?') : (x!='&'&&x!='='&&x!=';'))) { + p[j] = x; + } + else { + p[j] = '%'; + p[++j] = hex_chars_uc[n1]; /*(s[i+1] & 0xdf)*/ + p[++j] = hex_chars_uc[n2]; /*(s[i+2] & 0xdf)*/ + if (li_utf8_invalid_byte(x)) qs = -2; + } + i+=2; + } + else if (s[i] == '#') break; /* ignore fragment */ + else { + p[j] = '%'; + p[++j] = hex_chars_uc[(s[i] >> 4) & 0xF]; + p[++j] = hex_chars_uc[s[i] & 0xF]; + if (li_utf8_invalid_byte(s[i])) qs = -2; + } + } + buffer_commit(t, (size_t)j); + buffer_copy_buffer(b, t); + return qs; +} + + +static int burl_normalize_basic_required (buffer *b, buffer *t) +{ + const unsigned char * const s = (unsigned char *)b->ptr; + const int used = (int)buffer_string_length(b); + unsigned int n1, n2, x; + int qs = -1; + + for (int i = 0; i < used; ++i) { + if (!encoded_chars_http_uri_reqd[s[i]]) { + if (s[i] == '?' && -1 == qs) qs = i; + } + else if (s[i]=='%' && li_cton(s[i+1], n1) && li_cton(s[i+2], n2) + && (encoded_chars_http_uri_reqd[(x = (n1 << 4) | n2)] + ||(qs < 0 ? (x=='/'||x=='?') : (x=='&'||x=='='||x==';')))){ + if (li_utf8_invalid_byte(x)) qs = -2; + if (s[i+1] >= 'a') b->ptr[i+1] &= 0xdf; /* uppercase hex */ + if (s[i+2] >= 'a') b->ptr[i+2] &= 0xdf; /* uppercase hex */ + i+=2; + } + else if (s[i] == '#') { /* ignore fragment */ + buffer_string_set_length(b, (size_t)i); + break; + } + else { + qs = burl_normalize_basic_required_fix(b, t, i, qs); + break; + } + } + + return qs; +} + + +static int burl_contains_ctrls (const buffer *b) +{ + const char * const s = b->ptr; + const int used = (int)buffer_string_length(b); + for (int i = 0; i < used; ++i) { + if (s[i] == '%' && (s[i+1] < '2' || (s[i+1] == '7' && s[i+2] == 'F'))) + return 1; + } + return 0; +} + + +static void burl_normalize_qs20_to_plus_fix (buffer *b, int i) +{ + char * const s = b->ptr; + const int used = (int)buffer_string_length(b); + int j = i; + for (; i < used; ++i, ++j) { + s[j] = s[i]; + if (s[i] == '%' && s[i+1] == '2' && s[i+2] == '0') { + s[j] = '+'; + i+=2; + } + } + buffer_string_set_length(b, j); +} + + +static void burl_normalize_qs20_to_plus (buffer *b, int qs) +{ + const char * const s = b->ptr; + const int used = qs < 0 ? 0 : (int)buffer_string_length(b); + int i; + if (qs < 0) return; + for (i = qs+1; i < used; ++i) { + if (s[i] == '%' && s[i+1] == '2' && s[i+2] == '0') break; + } + if (i != used) burl_normalize_qs20_to_plus_fix(b, i); +} + + +static int burl_normalize_2F_to_slash_fix (buffer *b, int qs, int i) +{ + char * const s = b->ptr; + const int blen = (int)buffer_string_length(b); + const int used = qs < 0 ? blen : qs; + int j = i; + for (; i < used; ++i, ++j) { + s[j] = s[i]; + if (s[i] == '%' && s[i+1] == '2' && s[i+2] == 'F') { + s[j] = '/'; + i+=2; + } + } + if (qs >= 0) { + memmove(s+j, s+qs, blen - qs); + j += blen - qs; + } + buffer_string_set_length(b, j); + return qs; +} + + +static int burl_normalize_2F_to_slash (buffer *b, int qs, int flags) +{ + /*("%2F" must already have been uppercased during normalization)*/ + const char * const s = b->ptr; + const int used = qs < 0 ? (int)buffer_string_length(b) : qs; + for (int i = 0; i < used; ++i) { + if (s[i] == '%' && s[i+1] == '2' && s[i+2] == 'F') { + return (flags & HTTP_PARSEOPT_URL_NORMALIZE_PATH_2F_DECODE) + ? burl_normalize_2F_to_slash_fix(b, qs, i) + : -2; /*(flags & HTTP_PARSEOPT_URL_NORMALIZE_PATH_2F_REJECT)*/ + } + } + return qs; +} + + +static int burl_normalize_path (buffer *b, buffer *t, int qs, int flags) +{ + const unsigned char * const s = (unsigned char *)b->ptr; + const int used = (int)buffer_string_length(b); + int path_simplify = 0; + for (int i = 0, len = qs < 0 ? used : qs; i < len; ++i) { + if (s[i] == '.' && (s[i+1] != '.' || ++i) + && (s[i+1] == '/' || s[i+1] == '?' || s[i+1] == '\0')) { + path_simplify = 1; + break; + } + do { ++i; } while (i < len && s[i] != '/'); + if (s[i] == '/' && s[i+1] == '/') { /*(s[len] != '/')*/ + path_simplify = 1; + break; + } + } + + if (path_simplify) { + if (flags & HTTP_PARSEOPT_URL_NORMALIZE_PATH_DOTSEG_REJECT) return -2; + if (qs >= 0) { + buffer_copy_string_len(t, b->ptr+qs, used - qs); + buffer_string_set_length(b, qs); + } + + buffer_path_simplify(b, b); + + if (qs >= 0) { + qs = (int)buffer_string_length(b); + buffer_append_string_len(b, CONST_BUF_LEN(t)); + } + } + + return qs; +} + + +int burl_normalize (buffer *b, buffer *t, int flags) +{ + int qs; + + #if defined(__WIN32) || defined(__CYGWIN__) + /* Windows and Cygwin treat '\\' as '/' if '\\' is present in path; + * convert to '/' for consistency before percent-encoding + * normalization which will convert '\\' to "%5C" in the URL. + * (Clients still should not be sending '\\' unencoded in requests.) */ + if (flags & HTTP_PARSEOPT_URL_NORMALIZE_PATH_BACKSLASH_TRANS) { + for (char *p = b->ptr; *p != '?' && *p != '\0'; ++p) { + if (*p == '\\') *p = '/'; + } + } + #endif + + qs = (flags & HTTP_PARSEOPT_URL_NORMALIZE_REQUIRED) + ? burl_normalize_basic_required(b, t) + : burl_normalize_basic_unreserved(b, t); + if (-2 == qs) return -2; + + if (flags & HTTP_PARSEOPT_URL_NORMALIZE_CTRLS_REJECT) { + if (burl_contains_ctrls(b)) return -2; + } + + if (flags & (HTTP_PARSEOPT_URL_NORMALIZE_PATH_2F_DECODE + |HTTP_PARSEOPT_URL_NORMALIZE_PATH_2F_REJECT)) { + qs = burl_normalize_2F_to_slash(b, qs, flags); + if (-2 == qs) return -2; + } + + if (flags & (HTTP_PARSEOPT_URL_NORMALIZE_PATH_DOTSEG_REMOVE + |HTTP_PARSEOPT_URL_NORMALIZE_PATH_DOTSEG_REJECT)) { + qs = burl_normalize_path(b, t, qs, flags); + if (-2 == qs) return -2; + } + + if (flags & HTTP_PARSEOPT_URL_NORMALIZE_QUERY_20_PLUS) { + if (qs >= 0) burl_normalize_qs20_to_plus(b, qs); + } + + return qs; +} + + +static void burl_append_encode_nde (buffer * const b, const char * const str, const size_t len) +{ + /* percent-encodes everything except unreserved - . 0-9 A-Z _ a-z ~ + * unless already percent-encoded (does not double-encode) */ + /* Note: not checking for invalid UTF-8 */ + char * const p = buffer_string_prepare_append(b, len*3); + unsigned int n1, n2; + int j = 0; + for (unsigned int i = 0; i < len; ++i, ++j) { + if (str[i]=='%' && li_cton(str[i+1], n1) && li_cton(str[i+2], n2)) { + const unsigned int x = (n1 << 4) | n2; + if (burl_is_unreserved((int)x)) { + p[j] = (char)x; + } + else { /* leave UTF-8, control chars, and required chars encoded */ + p[j] = '%'; + p[++j] = str[i+1]; + p[++j] = str[i+2]; + } + i+=2; + } + else if (burl_is_unreserved(str[i])) { + p[j] = str[i]; + } + else { + p[j] = '%'; + p[++j] = hex_chars_uc[(str[i] >> 4) & 0xF]; + p[++j] = hex_chars_uc[str[i] & 0xF]; + } + } + buffer_commit(b, j); +} + + +static void burl_append_encode_psnde (buffer * const b, const char * const str, const size_t len) +{ + /* percent-encodes everything except unreserved - . 0-9 A-Z _ a-z ~ plus / + * unless already percent-encoded (does not double-encode) */ + /* Note: not checking for invalid UTF-8 */ + char * const p = buffer_string_prepare_append(b, len*3); + unsigned int n1, n2; + int j = 0; + for (unsigned int i = 0; i < len; ++i, ++j) { + if (str[i]=='%' && li_cton(str[i+1], n1) && li_cton(str[i+2], n2)) { + const unsigned int x = (n1 << 4) | n2; + if (burl_is_unreserved((int)x)) { + p[j] = (char)x; + } + else { /* leave UTF-8, control chars, and required chars encoded */ + p[j] = '%'; + p[++j] = str[i+1]; + p[++j] = str[i+2]; + } + i+=2; + } + else if (burl_is_unreserved(str[i]) || str[i] == '/') { + p[j] = str[i]; + } + else { + p[j] = '%'; + p[++j] = hex_chars_uc[(str[i] >> 4) & 0xF]; + p[++j] = hex_chars_uc[str[i] & 0xF]; + } + } + buffer_commit(b, j); +} + + +static void burl_append_encode_all (buffer * const b, const char * const str, const size_t len) +{ + /* percent-encodes everything except unreserved - . 0-9 A-Z _ a-z ~ + * Note: double-encodes any existing '%') */ + /* Note: not checking for invalid UTF-8 */ + char * const p = buffer_string_prepare_append(b, len*3); + int j = 0; + for (unsigned int i = 0; i < len; ++i, ++j) { + if (burl_is_unreserved(str[i])) { + p[j] = str[i]; + } + else { + p[j] = '%'; + p[++j] = hex_chars_uc[(str[i] >> 4) & 0xF]; + p[++j] = hex_chars_uc[str[i] & 0xF]; + } + } + buffer_commit(b, j); +} + + +static void burl_offset_tolower (buffer * const b, const size_t off) +{ + /*(skips over all percent-encodings, including encoding of alpha chars)*/ + for (char *p = b->ptr+off; p[0]; ++p) { + if (p[0] >= 'A' && p[0] <= 'Z') p[0] |= 0x20; + else if (p[0]=='%' && light_isxdigit(p[1]) && light_isxdigit(p[2])) + p+=2; + } +} + + +static void burl_offset_toupper (buffer * const b, const size_t off) +{ + /*(skips over all percent-encodings, including encoding of alpha chars)*/ + for (char *p = b->ptr+off; p[0]; ++p) { + if (p[0] >= 'a' && p[0] <= 'z') p[0] &= 0xdf; + else if (p[0]=='%' && light_isxdigit(p[1]) && light_isxdigit(p[2])) + p+=2; + } +} + + +void burl_append (buffer * const b, const char * const str, const size_t len, const int flags) +{ + size_t off = 0; + + if (0 == len) return; + + if (0 == flags) { + buffer_append_string_len(b, str, len); + return; + } + + if (flags & (BURL_TOUPPER|BURL_TOLOWER)) off = buffer_string_length(b); + + if (flags & BURL_ENCODE_NONE) { + buffer_append_string_len(b, str, len); + } + else if (flags & BURL_ENCODE_ALL) { + burl_append_encode_all(b, str, len); + } + else if (flags & BURL_ENCODE_NDE) { + burl_append_encode_nde(b, str, len); + } + else if (flags & BURL_ENCODE_PSNDE) { + burl_append_encode_psnde(b, str, len); + } + else if (flags & BURL_ENCODE_B64U) { + const unsigned char *s = (const unsigned char *)str; + buffer_append_base64_encode_no_padding(b, s, len, BASE64_URL); + } + else if (flags & BURL_DECODE_B64U) { + buffer_append_base64_decode(b, str, len, BASE64_URL); + } + + /* note: not normalizing str, which could come from arbitrary header, + * so it is possible that alpha chars are percent-encoded upper/lowercase */ + if (flags & (BURL_TOLOWER|BURL_TOUPPER)) { + (flags & BURL_TOLOWER) + ? burl_offset_tolower(b, off) /*(flags & BURL_TOLOWER)*/ + : burl_offset_toupper(b, off); /*(flags & BURL_TOUPPER)*/ + } +} |