diff options
Diffstat (limited to 'freeradius-fix-crash-unknown-eap-sim.patch')
| -rw-r--r-- | freeradius-fix-crash-unknown-eap-sim.patch | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/freeradius-fix-crash-unknown-eap-sim.patch b/freeradius-fix-crash-unknown-eap-sim.patch new file mode 100644 index 0000000..d2b7956 --- /dev/null +++ b/freeradius-fix-crash-unknown-eap-sim.patch @@ -0,0 +1,115 @@ +From: Antonio Torres <antorres@redhat.com> +Date: Fri, 09 Dec 2022 +Subject: Fix crash on unknown option in EAP-SIM + +When an EAP-SIM supplicant sends an unknown SIM option, the server will try to +look that option up in the internal dictionaries. This lookup will fail, but the +SIM code will not check for that failure. Instead, it will dereference a NULL +pointer, and cause the server to crash. + +Backport of: +https://github.com/FreeRADIUS/freeradius-server/commit/f1cdbb33ec61c4a64a +https://github.com/FreeRADIUS/freeradius-server/commit/71128cac3ee236a88a05cc7bddd43e43a88a3089 + +Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2151705 +Signed-off-by: Antonio Torres <antorres@redhat.com> +--- +diff --git a/src/modules/rlm_eap/libeap/eapsimlib.c b/src/modules/rlm_eap/libeap/eapsimlib.c +index cf1e8a7dd92..e438a844eab 100644 +--- a/src/modules/rlm_eap/libeap/eapsimlib.c ++++ b/src/modules/rlm_eap/libeap/eapsimlib.c +@@ -307,42 +307,77 @@ int unmap_eapsim_basictypes(RADIUS_PACKET *r, + newvp->vp_length = 1; + fr_pair_add(&(r->vps), newvp); + ++ /* ++ * EAP-SIM has a 1 octet of subtype, and 2 octets ++ * reserved. ++ */ + attr += 3; + attrlen -= 3; + +- /* now, loop processing each attribute that we find */ +- while(attrlen > 0) { ++ /* ++ * Loop over each attribute. The format is: ++ * ++ * 1 octet of type ++ * 1 octet of length (value 1..255) ++ * ((4 * length) - 2) octets of data. ++ */ ++ while (attrlen > 0) { + uint8_t *p; + +- if(attrlen < 2) { ++ if (attrlen < 2) { + fr_strerror_printf("EAP-Sim attribute %d too short: %d < 2", es_attribute_count, attrlen); + return 0; + } + ++ if (!attr[1]) { ++ fr_strerror_printf("EAP-Sim attribute %d (no.%d) has no data", attr[0], ++ es_attribute_count); ++ return 0; ++ } ++ + eapsim_attribute = attr[0]; + eapsim_len = attr[1] * 4; + ++ /* ++ * The length includes the 2-byte header. ++ */ + if (eapsim_len > attrlen) { + fr_strerror_printf("EAP-Sim attribute %d (no.%d) has length longer than data (%d > %d)", + eapsim_attribute, es_attribute_count, eapsim_len, attrlen); + return 0; + } + +- if(eapsim_len > MAX_STRING_LEN) { +- eapsim_len = MAX_STRING_LEN; +- } +- if (eapsim_len < 2) { +- fr_strerror_printf("EAP-Sim attribute %d (no.%d) has length too small", eapsim_attribute, +- es_attribute_count); +- return 0; +- } ++ newvp = fr_pair_afrom_num(r, eapsim_attribute + PW_EAP_SIM_BASE, 0); ++ if (!newvp) { ++ /* ++ * RFC 4186 Section 8.1 says 0..127 are ++ * "non-skippable". If one such ++ * attribute is found and we don't ++ * understand it, the server has to send: ++ * ++ * EAP-Request/SIM/Notification packet with an ++ * (AT_NOTIFICATION code, which implies general failure ("General ++ * failure after authentication" (0), or "General failure" (16384), ++ * depending on the phase of the exchange), which terminates the ++ * authentication exchange. ++ */ ++ if (eapsim_attribute <= 127) { ++ fr_strerror_printf("Unknown mandatory attribute %d, failing", ++ eapsim_attribute); ++ return 0; ++ } + +- newvp = fr_pair_afrom_num(r, eapsim_attribute+PW_EAP_SIM_BASE, 0); +- newvp->vp_length = eapsim_len-2; +- newvp->vp_octets = p = talloc_array(newvp, uint8_t, newvp->vp_length); +- memcpy(p, &attr[2], eapsim_len-2); +- fr_pair_add(&(r->vps), newvp); +- newvp = NULL; ++ } else { ++ /* ++ * It's known, ccount for header, and ++ * copy the value over. ++ */ ++ newvp->vp_length = eapsim_len - 2; ++ ++ newvp->vp_octets = p = talloc_array(newvp, uint8_t, newvp->vp_length); ++ memcpy(p, &attr[2], newvp->vp_length); ++ fr_pair_add(&(r->vps), newvp); ++ } + + /* advance pointers, decrement length */ + attr += eapsim_len; |