diff options
Diffstat (limited to 'meta-openembedded/meta-networking/recipes-daemons/squid/files/0001-Bug-4843-pt1-ext_edirectory_userip_acl-refactoring-f.patch')
| -rw-r--r-- | meta-openembedded/meta-networking/recipes-daemons/squid/files/0001-Bug-4843-pt1-ext_edirectory_userip_acl-refactoring-f.patch | 506 |
1 files changed, 506 insertions, 0 deletions
diff --git a/meta-openembedded/meta-networking/recipes-daemons/squid/files/0001-Bug-4843-pt1-ext_edirectory_userip_acl-refactoring-f.patch b/meta-openembedded/meta-networking/recipes-daemons/squid/files/0001-Bug-4843-pt1-ext_edirectory_userip_acl-refactoring-f.patch new file mode 100644 index 000000000..001d9e906 --- /dev/null +++ b/meta-openembedded/meta-networking/recipes-daemons/squid/files/0001-Bug-4843-pt1-ext_edirectory_userip_acl-refactoring-f.patch @@ -0,0 +1,506 @@ +From 01a44c96dbd04936e9cb2501745a834a0b09d504 Mon Sep 17 00:00:00 2001 +From: Amos Jeffries <yadij@users.noreply.github.com> +Date: Sun, 13 May 2018 06:57:41 +0000 +Subject: [PATCH] Bug 4843 pt1: ext_edirectory_userip_acl refactoring for GCC-8 + (#204) + +Proposed changes to this helper to fix strcat / strncat buffer +overread / overflow issues. + +The approach takes three parts: + +* adds a makeHexString function to replace many for-loops + catenating bits of strings together with hex conversion into a + second buffer. Replacing with a snprintf() and buffer overflow + handling. + +* a copy of Ip::Address::lookupHostIp to convert the input + string into IP address binary format, then generate the hex + string using the above new hex function instead of looped + sub-string concatenations across several buffers. + This removes all the "00" and "0000" strncat() calls and + allows far simpler code even with added buffer overflow + handling. + +* replace multiple string part concatenations with a few simpler + calls to snprintf() for all the search_ip buffer constructions. + Adding buffer overflow handling as needed for the new calls. +--- +Signed-off-by: Khem Raj <raj.khem@gmail.com> +Upstream-Status: Backport + + .../ext_edirectory_userip_acl.cc | 376 ++++++------------ + 1 file changed, 120 insertions(+), 256 deletions(-) + +diff --git a/helpers/external_acl/eDirectory_userip/ext_edirectory_userip_acl.cc b/helpers/external_acl/eDirectory_userip/ext_edirectory_userip_acl.cc +index 63609e4..ad16bfd 100644 +--- a/helpers/external_acl/eDirectory_userip/ext_edirectory_userip_acl.cc ++++ b/helpers/external_acl/eDirectory_userip/ext_edirectory_userip_acl.cc +@@ -67,6 +67,9 @@ + #ifdef HAVE_LDAP_H + #include <ldap.h> + #endif ++#ifdef HAVE_NETDB_H ++#include <netdb.h> ++#endif + + #ifdef HELPER_INPUT_BUFFER + #define EDUI_MAXLEN HELPER_INPUT_BUFFER +@@ -714,11 +717,14 @@ BindLDAP(edui_ldap_t *l, char *dn, char *pw, unsigned int t) + + /* Copy details - dn and pw CAN be NULL for anonymous and/or TLS */ + if (dn != NULL) { ++ if (strlen(dn) >= sizeof(l->dn)) ++ return LDAP_ERR_OOB; /* DN too large */ ++ + if ((l->basedn[0] != '\0') && (strstr(dn, l->basedn) == NULL)) { + /* We got a basedn, but it's not part of dn */ +- xstrncpy(l->dn, dn, sizeof(l->dn)); +- strncat(l->dn, ",", 1); +- strncat(l->dn, l->basedn, strlen(l->basedn)); ++ const int x = snprintf(l->dn, sizeof(l->dn)-1, "%s,%s", dn, l->basedn); ++ if (x < 0 || static_cast<size_t>(x) >= sizeof(l->dn)) ++ return LDAP_ERR_OOB; /* DN too large */ + } else + xstrncpy(l->dn, dn, sizeof(l->dn)); + } +@@ -778,24 +784,73 @@ BindLDAP(edui_ldap_t *l, char *dn, char *pw, unsigned int t) + } + } + ++// XXX: duplicate (partial) of Ip::Address::lookupHostIp ++/** ++ * Convert the IP address string representation in src to ++ * its binary representation. ++ * ++ * \return binary representation of the src IP address. ++ * Must be free'd using freeaddrinfo(). ++ */ ++static struct addrinfo * ++makeIpBinary(const char *src) ++{ ++ struct addrinfo want; ++ memset(&want, 0, sizeof(want)); ++ want.ai_flags = AI_NUMERICHOST; // prevent actual DNS lookups! ++ ++ struct addrinfo *dst = nullptr; ++ if (getaddrinfo(src, nullptr, &want, &dst) != 0) { ++ // not an IP address ++ /* free any memory getaddrinfo() dynamically allocated. */ ++ if (dst) ++ freeaddrinfo(dst); ++ return nullptr; ++ } ++ ++ return dst; ++} ++ ++/** ++ * Convert srcLen bytes from src into HEX and store into dst, which ++ * has a maximum content size of dstSize including c-string terminator. ++ * The dst value produced will be a 0-terminated c-string. ++ * ++ * \retval N length of dst written (excluding c-string terminator) ++ * \retval -11 (LDAP_ERR_OOB) buffer overflow detected ++ */ ++static int ++makeHexString(char *dst, const int dstSize, const char *src, const int srcLen) ++{ ++ // HEX encoding doubles the amount of bytes/octets copied ++ if ((srcLen*2) >= dstSize) ++ return LDAP_ERR_OOB; // cannot copy that many ++ ++ *dst = 0; ++ ++ for (int k = 0; k < srcLen; ++k) { ++ int c = static_cast<int>(src[k]); ++ if (c < 0) ++ c = c + 256; ++ char hexc[4]; ++ const int hlen = snprintf(hexc, sizeof(hexc), "%02X", c); ++ if (hlen < 0 || static_cast<size_t>(hlen) > sizeof(hexc)) // should be impossible ++ return LDAP_ERR_OOB; ++ strcat(dst, hexc); ++ } ++ return strlen(dst); ++} ++ + /* + * ConvertIP() - <edui_ldap_t> <ip> + * + * Take an IPv4 address in dot-decimal or IPv6 notation, and convert to 2-digit HEX stored in l->search_ip + * This is the networkAddress that we search LDAP for. +- * +- * PENDING -- CHANGE OVER TO inet*_pton, but inet6_pton does not provide the correct syntax +- * + */ + static int + ConvertIP(edui_ldap_t *l, char *ip) + { +- char bufa[EDUI_MAXLEN], bufb[EDUI_MAXLEN], obj[EDUI_MAXLEN]; +- char hexc[4], *p; + void *y, *z; +- size_t s; +- long x; +- int i, j, t, swi; /* IPv6 "::" cut over toggle */ + if (l == NULL) return LDAP_ERR_NULL; + if (ip == NULL) return LDAP_ERR_PARAM; + if (!(l->status & LDAP_INIT_S)) return LDAP_ERR_INIT; /* Not initalized */ +@@ -831,183 +886,22 @@ ConvertIP(edui_ldap_t *l, char *ip) + l->status |= (LDAP_IPV4_S); + z = NULL; + } +- s = strlen(ip); +- *(bufa) = '\0'; +- *(bufb) = '\0'; +- *(obj) = '\0'; +- /* StringSplit() will zero out bufa & obj at each call */ +- memset(l->search_ip, '\0', sizeof(l->search_ip)); +- xstrncpy(bufa, ip, sizeof(bufa)); /* To avoid segfaults, use bufa instead of ip */ +- swi = 0; +- if (l->status & LDAP_IPV6_S) { +- /* Search for :: in string */ +- if ((bufa[0] == ':') && (bufa[1] == ':')) { +- /* bufa starts with a ::, so just copy and clear */ +- xstrncpy(bufb, bufa, sizeof(bufb)); +- *(bufa) = '\0'; +- ++swi; /* Indicates that there is a bufb */ +- } else if ((bufa[0] == ':') && (bufa[1] != ':')) { +- /* bufa starts with a :, a typo so just fill in a ':', cat and clear */ +- bufb[0] = ':'; +- strncat(bufb, bufa, strlen(bufa)); +- *(bufa) = '\0'; +- ++swi; /* Indicates that there is a bufb */ +- } else { +- p = strstr(bufa, "::"); +- if (p != NULL) { +- /* Found it, break bufa down and split into bufb here */ +- *(bufb) = '\0'; +- i = strlen(p); +- memcpy(bufb, p, i); +- *p = '\0'; +- bufb[i] = '\0'; +- ++swi; /* Indicates that there is a bufb */ +- } +- } +- } +- s = strlen(bufa); +- if (s < 1) +- s = strlen(bufb); +- while (s > 0) { +- if ((l->status & LDAP_IPV4_S) && (swi == 0)) { +- /* Break down IPv4 address */ +- t = StringSplit(bufa, '.', obj, sizeof(obj)); +- if (t > 0) { +- errno = 0; +- x = strtol(obj, (char **)NULL, 10); +- if (((x < 0) || (x > 255)) || ((errno != 0) && (x == 0)) || ((obj[0] != '0') && (x == 0))) +- return LDAP_ERR_OOB; /* Out of bounds -- Invalid address */ +- memset(hexc, '\0', sizeof(hexc)); +- int hlen = snprintf(hexc, sizeof(hexc), "%02X", (int)x); +- strncat(l->search_ip, hexc, hlen); +- } else +- break; /* reached end of octet */ +- } else if (l->status & LDAP_IPV6_S) { +- /* Break down IPv6 address */ +- if (swi > 1) +- t = StringSplit(bufb, ':', obj, sizeof(obj)); /* After "::" */ +- else +- t = StringSplit(bufa, ':', obj, sizeof(obj)); /* Before "::" */ +- /* Convert octet by size (t) - and fill 0's */ +- switch (t) { /* IPv6 is already in HEX, copy contents */ +- case 4: +- hexc[0] = (char) toupper((int)obj[0]); +- i = (int)hexc[0]; +- if (!isxdigit(i)) +- return LDAP_ERR_OOB; /* Out of bounds */ +- hexc[1] = (char) toupper((int)obj[1]); +- i = (int)hexc[1]; +- if (!isxdigit(i)) +- return LDAP_ERR_OOB; /* Out of bounds */ +- hexc[2] = '\0'; +- strncat(l->search_ip, hexc, 2); +- hexc[0] = (char) toupper((int)obj[2]); +- i = (int)hexc[0]; +- if (!isxdigit(i)) +- return LDAP_ERR_OOB; /* Out of bounds */ +- hexc[1] = (char) toupper((int)obj[3]); +- i = (int)hexc[1]; +- if (!isxdigit(i)) +- return LDAP_ERR_OOB; /* Out of bounds */ +- hexc[2] = '\0'; +- strncat(l->search_ip, hexc, 2); +- break; +- case 3: +- hexc[0] = '0'; +- hexc[1] = (char) toupper((int)obj[0]); +- i = (int)hexc[1]; +- if (!isxdigit(i)) +- return LDAP_ERR_OOB; /* Out of bounds */ +- hexc[2] = '\0'; +- strncat(l->search_ip, hexc, 2); +- hexc[0] = (char) toupper((int)obj[1]); +- i = (int)hexc[0]; +- if (!isxdigit(i)) +- return LDAP_ERR_OOB; /* Out of bounds */ +- hexc[1] = (char) toupper((int)obj[2]); +- i = (int)hexc[1]; +- if (!isxdigit(i)) +- return LDAP_ERR_OOB; /* Out of bounds */ +- hexc[2] = '\0'; +- strncat(l->search_ip, hexc, 2); +- break; +- case 2: +- strncat(l->search_ip, "00", 2); +- hexc[0] = (char) toupper((int)obj[0]); +- i = (int)hexc[0]; +- if (!isxdigit(i)) +- return LDAP_ERR_OOB; /* Out of bounds */ +- hexc[1] = (char) toupper((int)obj[1]); +- i = (int)hexc[1]; +- if (!isxdigit(i)) +- return LDAP_ERR_OOB; /* Out of bounds */ +- hexc[2] = '\0'; +- strncat(l->search_ip, hexc, 2); +- break; +- case 1: +- strncat(l->search_ip, "00", 2); +- hexc[0] = '0'; +- hexc[1] = (char) toupper((int)obj[0]); +- i = (int)hexc[1]; +- if (!isxdigit(i)) +- return LDAP_ERR_OOB; /* Out of bounds */ +- hexc[2] = '\0'; +- strncat(l->search_ip, hexc, 2); +- break; +- default: +- if (t > 4) +- return LDAP_ERR_OOB; +- break; +- } +- /* Code to pad the address with 0's between a '::' */ +- if ((strlen(bufa) == 0) && (swi == 1)) { +- /* We are *AT* the split, pad in some 0000 */ +- t = strlen(bufb); +- /* How many ':' exist in bufb ? */ +- j = 0; +- for (i = 0; i < t; ++i) { +- if (bufb[i] == ':') +- ++j; +- } +- --j; /* Preceding "::" doesn't count */ +- t = 8 - (strlen(l->search_ip) / 4) - j; /* Remainder */ +- if (t > 0) { +- for (i = 0; i < t; ++i) +- strncat(l->search_ip, "0000", 4); +- } +- } +- } +- if ((bufa[0] == '\0') && (swi > 0)) { +- s = strlen(bufb); +- ++swi; +- } else +- s = strlen(bufa); +- } +- s = strlen(l->search_ip); + +- /* CHECK sizes of address, truncate or pad */ +- /* if "::" is at end of ip, then pad another block or two */ +- while ((l->status & LDAP_IPV6_S) && (s < 32)) { +- strncat(l->search_ip, "0000", 4); +- s = strlen(l->search_ip); +- } +- if ((l->status & LDAP_IPV6_S) && (s > 32)) { +- /* Too long, truncate */ +- l->search_ip[32] = '\0'; +- s = strlen(l->search_ip); +- } +- /* If at end of ip, and its not long enough, then pad another block or two */ +- while ((l->status & LDAP_IPV4_S) && (s < 8)) { +- strncat(l->search_ip, "00", 2); +- s = strlen(l->search_ip); +- } +- if ((l->status & LDAP_IPV4_S) && (s > 8)) { +- /* Too long, truncate */ +- l->search_ip[8] = '\0'; +- s = strlen(l->search_ip); ++ size_t s = LDAP_ERR_INVALID; ++ if (struct addrinfo *dst = makeIpBinary(ip)) { ++ if (dst->ai_family == AF_INET6) { ++ struct sockaddr_in6 *sia = reinterpret_cast<struct sockaddr_in6 *>(dst->ai_addr); ++ const char *ia = reinterpret_cast<const char *>(sia->sin6_addr.s6_addr); ++ s = makeHexString(l->search_ip, sizeof(l->search_ip), ia, 16); // IPv6 = 16-byte address ++ ++ } else if (dst->ai_family == AF_INET) { ++ struct sockaddr_in *sia = reinterpret_cast<struct sockaddr_in *>(dst->ai_addr); ++ const char *ia = reinterpret_cast<const char *>(&(sia->sin_addr)); ++ s = makeHexString(l->search_ip, sizeof(l->search_ip), ia, 4); // IPv4 = 4-byte address ++ } // else leave s with LDAP_ERR_INVALID value ++ freeaddrinfo(dst); + } + +- /* Completed, s is length of address in HEX */ + return s; + } + +@@ -1099,48 +993,42 @@ SearchFilterLDAP(edui_ldap_t *l, char *group) + } + if (group == NULL) { + /* No groupMembership= to add, yay! */ +- xstrncpy(bufa, "(&", sizeof(bufa)); +- strncat(bufa, edui_conf.search_filter, strlen(edui_conf.search_filter)); + /* networkAddress */ +- snprintf(bufb, sizeof(bufb), "(|(networkAddress=1\\23%s)", bufc); + if (l->status & LDAP_IPV4_S) { +- int ln = snprintf(bufd, sizeof(bufd), "(networkAddress=8\\23\\00\\00%s)(networkAddress=9\\23\\00\\00%s))", \ +- bufc, bufc); +- strncat(bufb, bufd, ln); ++ const int ln = snprintf(bufd, sizeof(bufd), "(networkAddress=8\\23\\00\\00%s)(networkAddress=9\\23\\00\\00%s)", bufc, bufc); ++ if (ln < 0 || static_cast<size_t>(ln) >= sizeof(bufd)) ++ return LDAP_ERR_OOB; ++ + } else if (l->status & LDAP_IPV6_S) { +- int ln = snprintf(bufd, sizeof(bufd), "(networkAddress=10\\23\\00\\00%s)(networkAddress=11\\23\\00\\00%s))", \ +- bufc, bufc); +- strncat(bufb, bufd, ln); +- } else +- strncat(bufb, ")", 1); +- strncat(bufa, bufb, strlen(bufb)); +- strncat(bufa, ")", 1); ++ const int ln = snprintf(bufd, sizeof(bufd), "(networkAddress=10\\23\\00\\00%s)(networkAddress=11\\23\\00\\00%s)", bufc, bufc); ++ if (ln < 0 || static_cast<size_t>(ln) >= sizeof(bufd)) ++ return LDAP_ERR_OOB; ++ } ++ const int x = snprintf(bufa, sizeof(bufa), "(&%s(|(networkAddress=1\\23%s)%s))", edui_conf.search_filter, bufc, bufd); ++ if (x < 0 || static_cast<size_t>(x) >= sizeof(bufa)) ++ return LDAP_ERR_OOB; ++ + } else { + /* Needs groupMembership= to add... */ +- xstrncpy(bufa, "(&(&", sizeof(bufa)); +- strncat(bufa, edui_conf.search_filter, strlen(edui_conf.search_filter)); + /* groupMembership -- NOTE: Squid *MUST* provide "cn=" from squid.conf */ +- snprintf(bufg, sizeof(bufg), "(groupMembership=%s", group); + if ((l->basedn[0] != '\0') && (strstr(group, l->basedn) == NULL)) { +- strncat(bufg, ",", 1); +- strncat(bufg, l->basedn, strlen(l->basedn)); ++ const int ln = snprintf(bufg, sizeof(bufg), ",%s", l->basedn); ++ if (ln < 0 || static_cast<size_t>(ln) >= sizeof(bufd)) ++ return LDAP_ERR_OOB; + } +- strncat(bufg, ")", 1); +- strncat(bufa, bufg, strlen(bufg)); + /* networkAddress */ +- snprintf(bufb, sizeof(bufb), "(|(networkAddress=1\\23%s)", bufc); + if (l->status & LDAP_IPV4_S) { +- int ln = snprintf(bufd, sizeof(bufd), "(networkAddress=8\\23\\00\\00%s)(networkAddress=9\\23\\00\\00%s))", \ +- bufc, bufc); +- strncat(bufb, bufd, ln); ++ const int ln = snprintf(bufd, sizeof(bufd), "(networkAddress=8\\23\\00\\00%s)(networkAddress=9\\23\\00\\00%s)", bufc, bufc); ++ if (ln < 0 || static_cast<size_t>(ln) >= sizeof(bufd)) ++ return LDAP_ERR_OOB; + } else if (l->status & LDAP_IPV6_S) { +- int ln = snprintf(bufd, sizeof(bufd), "(networkAddress=10\\23\\00\\00%s)(networkAddress=11\\23\\00\\00%s))", \ +- bufc, bufc); +- strncat(bufb, bufd, ln); +- } else +- strncat(bufb, ")", 1); +- strncat(bufa, bufb, strlen(bufb)); +- strncat(bufa, "))", 2); ++ const int ln = snprintf(bufd, sizeof(bufd), "(networkAddress=10\\23\\00\\00%s)(networkAddress=11\\23\\00\\00%s)", bufc, bufc); ++ if (ln < 0 || static_cast<size_t>(ln) >= sizeof(bufd)) ++ return LDAP_ERR_OOB; ++ } ++ const int x = snprintf(bufa, sizeof(bufa), "(&(&%s(groupMembership=%s%s)(|(networkAddress=1\\23%s)%s)))", edui_conf.search_filter, group, bufg, bufc, bufd); ++ if (x < 0 || static_cast<size_t>(x) >= sizeof(bufa)) ++ return LDAP_ERR_OOB; + } + s = strlen(bufa); + xstrncpy(l->search_filter, bufa, sizeof(l->search_filter)); +@@ -1212,10 +1100,10 @@ static int + SearchIPLDAP(edui_ldap_t *l) + { + ber_len_t i, x; +- ber_len_t j, k; +- ber_len_t y, z; +- int c; +- char bufa[EDUI_MAXLEN], bufb[EDUI_MAXLEN], hexc[4]; ++ ber_len_t j; ++ ber_len_t z; ++ char bufa[EDUI_MAXLEN]; ++ char bufb[EDUI_MAXLEN]; + LDAPMessage *ent; + if (l == NULL) return LDAP_ERR_NULL; + if (l->lp == NULL) return LDAP_ERR_POINTER; +@@ -1273,19 +1161,11 @@ SearchIPLDAP(edui_ldap_t *l) + /* bufa is the address, just compare it */ + if (!(l->status & LDAP_IPV4_S) || (l->status & LDAP_IPV6_S)) + break; /* Not looking for IPv4 */ +- for (k = 0; k < z; ++k) { +- c = (int) bufa[k]; +- if (c < 0) +- c = c + 256; +- int hlen = snprintf(hexc, sizeof(hexc), "%02X", c); +- if (k == 0) +- xstrncpy(bufb, hexc, sizeof(bufb)); +- else +- strncat(bufb, hexc, hlen); +- } +- y = strlen(bufb); ++ const int blen = makeHexString(bufb, sizeof(bufb), bufa, z); ++ if (blen < 0) ++ return blen; + /* Compare value with IP */ +- if (memcmp(l->search_ip, bufb, y) == 0) { ++ if (memcmp(l->search_ip, bufb, blen) == 0) { + /* We got a match! - Scan 'ber' for 'cn' values */ + z = ldap_count_values_len(ber); + for (j = 0; j < z; ++j) { +@@ -1308,19 +1188,11 @@ SearchIPLDAP(edui_ldap_t *l) + /* bufa + 2 is the address (skip 2 digit port) */ + if (!(l->status & LDAP_IPV4_S) || (l->status & LDAP_IPV6_S)) + break; /* Not looking for IPv4 */ +- for (k = 2; k < z; ++k) { +- c = (int) bufa[k]; +- if (c < 0) +- c = c + 256; +- int hlen = snprintf(hexc, sizeof(hexc), "%02X", c); +- if (k == 2) +- xstrncpy(bufb, hexc, sizeof(bufb)); +- else +- strncat(bufb, hexc, hlen); +- } +- y = strlen(bufb); ++ const int blen = makeHexString(bufb, sizeof(bufb), &bufa[2], z); ++ if (blen < 0) ++ return blen; + /* Compare value with IP */ +- if (memcmp(l->search_ip, bufb, y) == 0) { ++ if (memcmp(l->search_ip, bufb, blen) == 0) { + /* We got a match! - Scan 'ber' for 'cn' values */ + z = ldap_count_values_len(ber); + for (j = 0; j < z; ++j) { +@@ -1343,19 +1215,11 @@ SearchIPLDAP(edui_ldap_t *l) + /* bufa + 2 is the address (skip 2 digit port) */ + if (!(l->status & LDAP_IPV6_S)) + break; /* Not looking for IPv6 */ +- for (k = 2; k < z; ++k) { +- c = (int) bufa[k]; +- if (c < 0) +- c = c + 256; +- int hlen = snprintf(hexc, sizeof(hexc), "%02X", c); +- if (k == 2) +- xstrncpy(bufb, hexc, sizeof(bufb)); +- else +- strncat(bufb, hexc, hlen); +- } +- y = strlen(bufb); ++ const int blen = makeHexString(bufb, sizeof(bufb), &bufa[2], z); ++ if (blen < 0) ++ return blen; + /* Compare value with IP */ +- if (memcmp(l->search_ip, bufb, y) == 0) { ++ if (memcmp(l->search_ip, bufb, blen) == 0) { + /* We got a match! - Scan 'ber' for 'cn' values */ + z = ldap_count_values_len(ber); + for (j = 0; j < z; ++j) { |
