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authorStephen Gallagher <sgallagh@redhat.com>2010-03-23 16:35:49 -0400
committerStephen Gallagher <sgallagh@redhat.com>2010-03-25 16:02:27 -0400
commit80c8a4f94d54b23bce206fdd75ff2648977ce271 (patch)
tree7a03b98f665e4ebf7005c580fd9873200f023fad
parentf94abf5319d8f74cacae0a98d3925d18eb6839eb (diff)
downloadsssd-80c8a4f94d54b23bce206fdd75ff2648977ce271.tar.gz
sssd-80c8a4f94d54b23bce206fdd75ff2648977ce271.tar.xz
sssd-80c8a4f94d54b23bce206fdd75ff2648977ce271.zip
Allow arbitrary-length PAM messages
The PAM standard allows for messages of any length to be returned to the client. We were discarding all messages of length greater than 255. This patch dynamically allocates the message buffers so we can pass the complete message. This resolves https://fedorahosted.org/sssd/ticket/432
-rw-r--r--src/providers/child_common.c20
-rw-r--r--src/providers/child_common.h5
-rw-r--r--src/providers/krb5/krb5_auth.c2
-rw-r--r--src/providers/krb5/krb5_child.c25
-rw-r--r--src/providers/ldap/ldap_child.c12
-rw-r--r--src/sss_client/pam_sss.c23
-rw-r--r--src/util/user_info_msg.c11
7 files changed, 55 insertions, 43 deletions
diff --git a/src/providers/child_common.c b/src/providers/child_common.c
index 2ad0f04e3..b98025577 100644
--- a/src/providers/child_common.c
+++ b/src/providers/child_common.c
@@ -149,9 +149,8 @@ struct tevent_req *read_pipe_send(TALLOC_CTX *mem_ctx,
if (req == NULL) return NULL;
state->fd = fd;
- state->buf = talloc_array(state, uint8_t, MAX_CHILD_MSG_SIZE);
+ state->buf = NULL;
state->len = 0;
- if (state->buf == NULL) goto fail;
fde = tevent_add_fd(ev, state, fd, TEVENT_FD_READ,
read_pipe_handler, req);
@@ -176,6 +175,7 @@ static void read_pipe_handler(struct tevent_context *ev,
struct read_pipe_state);
ssize_t size;
errno_t err;
+ uint8_t buf[CHILD_MSG_CHUNK];
if (flags & TEVENT_FD_WRITE) {
DEBUG(1, ("read_pipe_done called with TEVENT_FD_WRITE,"
@@ -185,8 +185,8 @@ static void read_pipe_handler(struct tevent_context *ev,
}
size = read(state->fd,
- state->buf + state->len,
- MAX_CHILD_MSG_SIZE - state->len);
+ buf,
+ CHILD_MSG_CHUNK);
if (size == -1) {
err = errno;
if (err == EAGAIN || err == EINTR) {
@@ -198,13 +198,17 @@ static void read_pipe_handler(struct tevent_context *ev,
return;
} else if (size > 0) {
- state->len += size;
- if (state->len > MAX_CHILD_MSG_SIZE) {
- DEBUG(1, ("read to much, this should never happen.\n"));
- tevent_req_error(req, EINVAL);
+ state->buf = talloc_realloc(state, state->buf, uint8_t,
+ state->len + size);
+ if(!state->buf) {
+ tevent_req_error(req, ENOMEM);
return;
}
+ safealign_memcpy(&state->buf[state->len], buf,
+ size, &state->len);
+ return;
+
} else if (size == 0) {
DEBUG(6, ("EOF received, client finished\n"));
tevent_req_done(req);
diff --git a/src/providers/child_common.h b/src/providers/child_common.h
index a441df3c5..0b2081d2d 100644
--- a/src/providers/child_common.h
+++ b/src/providers/child_common.h
@@ -33,12 +33,11 @@
#include "util/util.h"
#define IN_BUF_SIZE 512
-#define MAX_CHILD_MSG_SIZE 255
+#define CHILD_MSG_CHUNK 256
struct response {
- size_t max_size;
- size_t size;
uint8_t *buf;
+ size_t size;
};
struct io_buffer {
diff --git a/src/providers/krb5/krb5_auth.c b/src/providers/krb5/krb5_auth.c
index ce3aacd82..880930a15 100644
--- a/src/providers/krb5/krb5_auth.c
+++ b/src/providers/krb5/krb5_auth.c
@@ -1091,7 +1091,7 @@ static void krb5_child_done(struct tevent_req *req)
*msg_len));
if ((p + *msg_len) != len) {
- DEBUG(1, ("message format error.\n"));
+ DEBUG(1, ("message format error [%d] != [%d].\n", p+*msg_len, len));
goto done;
}
diff --git a/src/providers/krb5/krb5_child.c b/src/providers/krb5/krb5_child.c
index 86242ef30..620e4d140 100644
--- a/src/providers/krb5/krb5_child.c
+++ b/src/providers/krb5/krb5_child.c
@@ -247,27 +247,15 @@ done:
return kerr;
}
-static struct response *init_response(TALLOC_CTX *mem_ctx) {
- struct response *r;
- r = talloc(mem_ctx, struct response);
- r->buf = talloc_size(mem_ctx, MAX_CHILD_MSG_SIZE);
- if (r->buf == NULL) {
- DEBUG(1, ("talloc_size failed.\n"));
- return NULL;
- }
- r->max_size = MAX_CHILD_MSG_SIZE;
- r->size = 0;
-
- return r;
-}
-
static errno_t pack_response_packet(struct response *resp, int status, int type,
size_t len, const uint8_t *data)
{
size_t p = 0;
- if ((3*sizeof(int32_t) + len +1) > resp->max_size) {
- DEBUG(1, ("response message too big.\n"));
+ resp->buf = talloc_array(resp, uint8_t,
+ 3*sizeof(int32_t) + len);
+ if (!resp->buf) {
+ DEBUG(1, ("Insufficient memory to create message.\n"));
return ENOMEM;
}
@@ -293,9 +281,9 @@ static struct response *prepare_response_message(struct krb5_req *kr,
size_t user_resp_len;
uint8_t *user_resp;
- resp = init_response(kr);
+ resp = talloc_zero(kr, struct response);
if (resp == NULL) {
- DEBUG(1, ("init_response failed.\n"));
+ DEBUG(1, ("Initializing response failed.\n"));
return NULL;
}
@@ -321,7 +309,6 @@ static struct response *prepare_response_message(struct krb5_req *kr,
talloc_zfree(msg);
}
} else {
-
if (user_error_message != NULL) {
ret = pack_user_info_chpass_error(kr, user_error_message,
&user_resp_len, &user_resp);
diff --git a/src/providers/ldap/ldap_child.c b/src/providers/ldap/ldap_child.c
index 069fbcfe1..6a78ca012 100644
--- a/src/providers/ldap/ldap_child.c
+++ b/src/providers/ldap/ldap_child.c
@@ -97,6 +97,11 @@ static int pack_buffer(struct response *r, int result, const char *msg)
len = strlen(msg);
r->size = 2 * sizeof(uint32_t) + len;
+ r->buf = talloc_array(r, uint8_t, r->size);
+ if(!r->buf) {
+ return ENOMEM;
+ }
+
/* result */
SAFEALIGN_SET_UINT32(&r->buf[p], result, &p);
@@ -265,12 +270,7 @@ static int prepare_response(TALLOC_CTX *mem_ctx,
r = talloc_zero(mem_ctx, struct response);
if (!r) return ENOMEM;
- r->buf = talloc_size(mem_ctx, MAX_CHILD_MSG_SIZE);
- if (r->buf == NULL) {
- DEBUG(1, ("talloc_size failed.\n"));
- return ENOMEM;
- }
- r->max_size = MAX_CHILD_MSG_SIZE;
+ r->buf = NULL;
r->size = 0;
if (kerr == 0) {
diff --git a/src/sss_client/pam_sss.c b/src/sss_client/pam_sss.c
index 07ed4e721..6059dfaa1 100644
--- a/src/sss_client/pam_sss.c
+++ b/src/sss_client/pam_sss.c
@@ -588,7 +588,8 @@ static int user_info_chpass_error(pam_handle_t *pamh, size_t buflen,
{
int ret;
uint32_t msg_len;
- char user_msg[256];
+ char *user_msg;
+ size_t bufsize = 0;
if (buflen < 2* sizeof(uint32_t)) {
D(("User info response data is too short"));
@@ -602,19 +603,35 @@ static int user_info_chpass_error(pam_handle_t *pamh, size_t buflen,
return PAM_BUF_ERR;
}
- ret = snprintf(user_msg, sizeof(user_msg), "%s%s%.*s",
+ bufsize = strlen(_("Password change failed. ")) + 1;
+
+ if (msg_len > 0) {
+ bufsize += strlen(_("Server message: ")) + msg_len;
+ }
+
+ user_msg = (char *)malloc(sizeof(char) * bufsize);
+ if (!user_msg) {
+ D(("Out of memory."));
+ return PAM_SYSTEM_ERR;
+ }
+
+ ret = snprintf(user_msg, bufsize, "%s%s%.*s",
_("Password change failed. "),
msg_len > 0 ? _("Server message: ") : "",
msg_len,
msg_len > 0 ? (char *)(buf + 2 * sizeof(uint32_t)) : "" );
- if (ret < 0 || ret >= sizeof(user_msg)) {
+ if (ret < 0 || ret > bufsize) {
D(("snprintf failed."));
+
+ free(user_msg);
return PAM_SYSTEM_ERR;
}
ret = do_pam_conversation(pamh, PAM_TEXT_INFO, user_msg, NULL, NULL);
+ free(user_msg);
if (ret != PAM_SUCCESS) {
D(("do_pam_conversation failed."));
+
return PAM_SYSTEM_ERR;
}
diff --git a/src/util/user_info_msg.c b/src/util/user_info_msg.c
index 547e3bb74..505b03d91 100644
--- a/src/util/user_info_msg.c
+++ b/src/util/user_info_msg.c
@@ -33,6 +33,7 @@ errno_t pack_user_info_chpass_error(TALLOC_CTX *mem_ctx,
uint32_t resp_type = SSS_PAM_USER_INFO_CHPASS_ERROR;
size_t err_len;
uint8_t *resp;
+ size_t p;
err_len = strlen(user_error_message);
*resp_len = 2 * sizeof(uint32_t) + err_len;
@@ -42,9 +43,13 @@ errno_t pack_user_info_chpass_error(TALLOC_CTX *mem_ctx,
return ENOMEM;
}
- memcpy(resp, &resp_type, sizeof(uint32_t));
- memcpy(resp + sizeof(uint32_t), &err_len, sizeof(uint32_t));
- memcpy(resp + 2 * sizeof(uint32_t), user_error_message, err_len);
+ p = 0;
+ SAFEALIGN_SET_UINT32(&resp[p], resp_type, &p);
+ SAFEALIGN_SET_UINT32(&resp[p], err_len, &p);
+ safealign_memcpy(&resp[p], user_error_message, err_len, &p);
+ if (p != *resp_len) {
+ DEBUG(0, ("Size mismatch\n"));
+ }
*_resp = resp;
return EOK;